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[tip: x86/urgent] x86/mm: Disable hugetlb page table sharing on 32-bit

by tip-bot2 for Jann Horn

The following commit has been merged into the x86/urgent branch of tip: Commit-ID: 76303ee8d54bff6d9a6d55997acd88a6c2ba63cf Gitweb: https://git.kernel.org/tip/76303ee8d54bff6d9a6d55997acd88a6c2ba63cf Author: Jann Horn <jannh(a)google.com> AuthorDate: Wed, 02 Jul 2025 10:32:04 +02:00 Committer: Dave Hansen <dave.hansen(a)linux.intel.com> CommitterDate: Wed, 09 Jul 2025 07:46:36 -07:00 x86/mm: Disable hugetlb page table sharing on 32-bit Only select ARCH_WANT_HUGE_PMD_SHARE on 64-bit x86. Page table sharing requires at least three levels because it involves shared references to PMD tables; 32-bit x86 has either two-level paging (without PAE) or three-level paging (with PAE), but even with three-level paging, having a dedicated PGD entry for hugetlb is only barely possible (because the PGD only has four entries), and it seems unlikely anyone's actually using PMD sharing on 32-bit. Having ARCH_WANT_HUGE_PMD_SHARE enabled on non-PAE 32-bit X86 (which has 2-level paging) became particularly problematic after commit 59d9094df3d7 ("mm: hugetlb: independent PMD page table shared count"), since that changes `struct ptdesc` such that the `pt_mm` (for PGDs) and the `pt_share_count` (for PMDs) share the same union storage - and with 2-level paging, PMDs are PGDs. (For comparison, arm64 also gates ARCH_WANT_HUGE_PMD_SHARE on the configuration of page tables such that it is never enabled with 2-level paging.) Closes: https://lore.kernel.org/r/srhpjxlqfna67blvma5frmy3aa@altlinux.org Fixes: cfe28c5d63d8 ("x86: mm: Remove x86 version of huge_pmd_share.") Reported-by: Vitaly Chikunov <vt(a)altlinux.org> Suggested-by: Dave Hansen <dave.hansen(a)intel.com> Signed-off-by: Jann Horn <jannh(a)google.com> Signed-off-by: Dave Hansen <dave.hansen(a)linux.intel.com> Acked-by: Oscar Salvador <osalvador(a)suse.de> Acked-by: David Hildenbrand <david(a)redhat.com> Tested-by: Vitaly Chikunov <vt(a)altlinux.org> Cc:stable@vger.kernel.org Link: https://lore.kernel.org/all/20250702-x86-2level-hugetlb-v2-1-1a98096edf92%4… --- arch/x86/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 71019b3..4e0fe68 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -147,7 +147,7 @@ config X86 select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_WANTS_NO_INSTR select ARCH_WANT_GENERAL_HUGETLB - select ARCH_WANT_HUGE_PMD_SHARE + select ARCH_WANT_HUGE_PMD_SHARE if X86_64 select ARCH_WANT_LD_ORPHAN_WARN select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP if X86_64 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEMMAP if X86_64

4 months

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[PATCH 0/3] HID: core: fix __hid_request when no report ID is used

by Benjamin Tissoires

[Ideally I'd like to have tests in selftests, but I couldn't extract them out of the syzbot reproducer, so sending that first series to check against syzbot] Followup of https://lore.kernel.org/linux-input/c75433e0-9b47-4072-bbe8-b1d14ea97b13@ro… This initial series attempt at fixing the various bugs discovered by Alan regarding __hid_request(). Syzbot managed to create a report descriptor which presents a feature request of size 0 (still trying to extract it) and this exposed the fact that __hid_request() was incorrectly handling the case when the report ID is not used. Send a first batch of fixes now so we get the feedback from syzbot ASAP. Note: in the series, I also mentioned that the report of size 0 should be stripped out of the HID device, but without a local reproducer this is going to be difficult to implement. Signed-off-by: Benjamin Tissoires <bentiss(a)kernel.org> --- Benjamin Tissoires (3): HID: core: ensure the allocated report buffer can contain the reserved report ID HID: core: ensure __hid_request reserves the report ID as the first byte HID: core: do not bypass hid_hw_raw_request drivers/hid/hid-core.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) --- base-commit: 1f988d0788f50d8464f957e793fab356e2937369 change-id: 20250709-report-size-null-37619ea20288 Best regards, -- Benjamin Tissoires <bentiss(a)kernel.org>

4 months

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[PATCH 1/2] drm/gem: Fix race in drm_gem_handle_create_tail()

by Simona Vetter

Object creation is a careful dance where we must guarantee that the object is fully constructed before it is visible to other threads, and GEM buffer objects are no difference. Final publishing happens by calling drm_gem_handle_create(). After that the only allowed thing to do is call drm_gem_object_put() because a concurrent call to the GEM_CLOSE ioctl with a correctly guessed id (which is trivial since we have a linear allocator) can already tear down the object again. Luckily most drivers get this right, the very few exceptions I've pinged the relevant maintainers for. Unfortunately we also need drm_gem_handle_create() when creating additional handles for an already existing object (e.g. GETFB ioctl or the various bo import ioctl), and hence we cannot have a drm_gem_handle_create_and_put() as the only exported function to stop these issues from happening. Now unfortunately the implementation of drm_gem_handle_create() isn't living up to standards: It does correctly finishe object initialization at the global level, and hence is safe against a concurrent tear down. But it also sets up the file-private aspects of the handle, and that part goes wrong: We fully register the object in the drm_file.object_idr before calling drm_vma_node_allow() or obj->funcs->open, which opens up races against concurrent removal of that handle in drm_gem_handle_delete(). Fix this with the usual two-stage approach of first reserving the handle id, and then only registering the object after we've completed the file-private setup. Jacek reported this with a testcase of concurrently calling GEM_CLOSE on a freshly-created object (which also destroys the object), but it should be possible to hit this with just additional handles created through import or GETFB without completed destroying the underlying object with the concurrent GEM_CLOSE ioctl calls. Note that the close-side of this race was fixed in f6cd7daecff5 ("drm: Release driver references to handle before making it available again"), which means a cool 9 years have passed until someone noticed that we need to make this symmetry or there's still gaps left :-/ Without the 2-stage close approach we'd still have a race, therefore that's an integral part of this bugfix. More importantly, this means we can have NULL pointers behind allocated id in our drm_file.object_idr. We need to check for that now: - drm_gem_handle_delete() checks for ERR_OR_NULL already - drm_gem.c:object_lookup() also chekcs for NULL - drm_gem_release() should never be called if there's another thread still existing that could call into an IOCTL that creates a new handle, so cannot race. For paranoia I added a NULL check to drm_gem_object_release_handle() though. - most drivers (etnaviv, i915, msm) are find because they use idr_find(), which maps both ENOENT and NULL to NULL. - drivers using idr_for_each_entry() should also be fine, because idr_get_next does filter out NULL entries and continues the iteration. - The same holds for drm_show_memory_stats(). v2: Use drm_WARN_ON (Thomas) Reported-by: Jacek Lawrynowicz <jacek.lawrynowicz(a)linux.intel.com> Tested-by: Jacek Lawrynowicz <jacek.lawrynowicz(a)linux.intel.com> Reviewed-by: Thomas Zimmermann <tzimmermann(a)suse.de> Cc: stable(a)vger.kernel.org Cc: Jacek Lawrynowicz <jacek.lawrynowicz(a)linux.intel.com> Cc: Maarten Lankhorst <maarten.lankhorst(a)linux.intel.com> Cc: Maxime Ripard <mripard(a)kernel.org> Cc: Thomas Zimmermann <tzimmermann(a)suse.de> Cc: David Airlie <airlied(a)gmail.com> Cc: Simona Vetter <simona(a)ffwll.ch> Signed-off-by: Simona Vetter <simona.vetter(a)intel.com> Signed-off-by: Simona Vetter <simona.vetter(a)ffwll.ch> --- drivers/gpu/drm/drm_gem.c | 10 +++++++++- include/drm/drm_file.h | 3 +++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c index bc505d938b3e..1aa9192c4cc6 100644 --- a/drivers/gpu/drm/drm_gem.c +++ b/drivers/gpu/drm/drm_gem.c @@ -316,6 +316,9 @@ drm_gem_object_release_handle(int id, void *ptr, void *data) struct drm_file *file_priv = data; struct drm_gem_object *obj = ptr; + if (drm_WARN_ON(obj->dev, !data)) + return 0; + if (obj->funcs->close) obj->funcs->close(obj, file_priv); @@ -436,7 +439,7 @@ drm_gem_handle_create_tail(struct drm_file *file_priv, idr_preload(GFP_KERNEL); spin_lock(&file_priv->table_lock); - ret = idr_alloc(&file_priv->object_idr, obj, 1, 0, GFP_NOWAIT); + ret = idr_alloc(&file_priv->object_idr, NULL, 1, 0, GFP_NOWAIT); spin_unlock(&file_priv->table_lock); idr_preload_end(); @@ -457,6 +460,11 @@ drm_gem_handle_create_tail(struct drm_file *file_priv, goto err_revoke; } + /* mirrors drm_gem_handle_delete to avoid races */ + spin_lock(&file_priv->table_lock); + obj = idr_replace(&file_priv->object_idr, obj, handle); + WARN_ON(obj != NULL); + spin_unlock(&file_priv->table_lock); *handlep = handle; return 0; diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h index eab7546aad79..115763799625 100644 --- a/include/drm/drm_file.h +++ b/include/drm/drm_file.h @@ -300,6 +300,9 @@ struct drm_file { * * Mapping of mm object handles to object pointers. Used by the GEM * subsystem. Protected by @table_lock. + * + * Note that allocated entries might be NULL as a transient state when + * creating or deleting a handle. */ struct idr object_idr; -- 2.49.0

4 months

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Backport perf makefile fix to linux-6.6.y

by Alexis Lothoré

Hello stable team, could you please backport commit 440cf77625e3 ("perf: build: Setup PKG_CONFIG_LIBDIR for cross compilation") to linux-6.6.y ? Its absence prevents some people from building the perf tool in cross-compile environment with this kernel. The patch applies cleanly on linux-6.6.y Thanks, Alexis -- Alexis Lothoré, Bootlin Embedded Linux and Kernel engineering https://bootlin.com

4 months

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[RFC V1 PATCH mm-hotfixes 3/3] x86/mm: convert {pgd,p4d}_populate{,_init} to _kernel variant

by Harry Yoo

Introduce {pgd,p4d}_populate_kernel_safe() and convert {pgd,p4d}_populate{,_init}() to {pgd,p4d}_populate_kernel{,_init}(). By converting them, we no longer need to worry about forgetting to synchronize top level page tables. With all {pgd,p4d}_populate{,_init}() converted to {pgd,p4d}_populate_kernel{,_init}(), it is now safe to drop sync_global_pgds(). Let's remove it. Cc: <stable(a)vger.kernel.org> Suggested-by: Dave Hansen <dave.hansen(a)linux.intel.com> Signed-off-by: Harry Yoo <harry.yoo(a)oracle.com> --- arch/x86/include/asm/pgalloc.h | 19 +++++ arch/x86/mm/init_64.c | 129 ++++++--------------------------- arch/x86/mm/kasan_init_64.c | 8 +- 3 files changed, 46 insertions(+), 110 deletions(-) diff --git a/arch/x86/include/asm/pgalloc.h b/arch/x86/include/asm/pgalloc.h index d66f2db54b16..98439b9ca293 100644 --- a/arch/x86/include/asm/pgalloc.h +++ b/arch/x86/include/asm/pgalloc.h @@ -132,6 +132,15 @@ static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pu set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); } +static inline void p4d_populate_kernel_safe(unsigned long addr, + p4d_t *p4d, pud_t *pud) +{ + paravirt_alloc_pud(&init_mm, __pa(pud) >> PAGE_SHIFT); + set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); + if (!pgtable_l5_enabled()) + arch_sync_kernel_pagetables(addr); +} + extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, @@ -167,6 +176,16 @@ static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4 set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); } +static inline void pgd_populate_kernel_safe(unsigned long addr, + pgd_t *pgd, p4d_t *p4d) +{ + if (!pgtable_l5_enabled()) + return; + paravirt_alloc_p4d(&init_mm, __pa(p4d) >> PAGE_SHIFT); + set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); + arch_sync_kernel_pagetables(addr); +} + extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index cbddbef434d5..00608ab36936 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -75,6 +75,19 @@ DEFINE_POPULATE(pgd_populate, pgd, p4d, init) DEFINE_POPULATE(pud_populate, pud, pmd, init) DEFINE_POPULATE(pmd_populate_kernel, pmd, pte, init) +#define DEFINE_POPULATE_KERNEL(fname, type1, type2, init) \ +static inline void fname##_init(unsigned long addr, \ + type1##_t *arg1, type2##_t *arg2, bool init) \ +{ \ + if (init) \ + fname##_safe(addr, arg1, arg2); \ + else \ + fname(addr, arg1, arg2); \ +} + +DEFINE_POPULATE_KERNEL(pgd_populate_kernel, pgd, p4d, init) +DEFINE_POPULATE_KERNEL(p4d_populate_kernel, p4d, pud, init) + #define DEFINE_ENTRY(type1, type2, init) \ static inline void set_##type1##_init(type1##_t *arg1, \ type2##_t arg2, bool init) \ @@ -130,99 +143,6 @@ static int __init nonx32_setup(char *str) } __setup("noexec32=", nonx32_setup); -static void sync_global_pgds_l5(unsigned long start, unsigned long end) -{ - unsigned long addr; - - for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) { - const pgd_t *pgd_ref = pgd_offset_k(addr); - struct page *page; - - /* Check for overflow */ - if (addr < start) - break; - - if (pgd_none(*pgd_ref)) - continue; - - spin_lock(&pgd_lock); - list_for_each_entry(page, &pgd_list, lru) { - pgd_t *pgd; - spinlock_t *pgt_lock; - - pgd = (pgd_t *)page_address(page) + pgd_index(addr); - /* the pgt_lock only for Xen */ - pgt_lock = &pgd_page_get_mm(page)->page_table_lock; - spin_lock(pgt_lock); - - if (!pgd_none(*pgd_ref) && !pgd_none(*pgd)) - BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref)); - - if (pgd_none(*pgd)) - set_pgd(pgd, *pgd_ref); - - spin_unlock(pgt_lock); - } - spin_unlock(&pgd_lock); - } -} - -static void sync_global_pgds_l4(unsigned long start, unsigned long end) -{ - unsigned long addr; - - for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) { - pgd_t *pgd_ref = pgd_offset_k(addr); - const p4d_t *p4d_ref; - struct page *page; - - /* - * With folded p4d, pgd_none() is always false, we need to - * handle synchronization on p4d level. - */ - MAYBE_BUILD_BUG_ON(pgd_none(*pgd_ref)); - p4d_ref = p4d_offset(pgd_ref, addr); - - if (p4d_none(*p4d_ref)) - continue; - - spin_lock(&pgd_lock); - list_for_each_entry(page, &pgd_list, lru) { - pgd_t *pgd; - p4d_t *p4d; - spinlock_t *pgt_lock; - - pgd = (pgd_t *)page_address(page) + pgd_index(addr); - p4d = p4d_offset(pgd, addr); - /* the pgt_lock only for Xen */ - pgt_lock = &pgd_page_get_mm(page)->page_table_lock; - spin_lock(pgt_lock); - - if (!p4d_none(*p4d_ref) && !p4d_none(*p4d)) - BUG_ON(p4d_pgtable(*p4d) - != p4d_pgtable(*p4d_ref)); - - if (p4d_none(*p4d)) - set_p4d(p4d, *p4d_ref); - - spin_unlock(pgt_lock); - } - spin_unlock(&pgd_lock); - } -} - -/* - * When memory was added make sure all the processes MM have - * suitable PGD entries in the local PGD level page. - */ -static void sync_global_pgds(unsigned long start, unsigned long end) -{ - if (pgtable_l5_enabled()) - sync_global_pgds_l5(start, end); - else - sync_global_pgds_l4(start, end); -} - static void sync_kernel_pagetables_l4(unsigned long addr) { pgd_t *pgd_ref = pgd_offset_k(addr); @@ -295,6 +215,10 @@ static void sync_kernel_pagetables_l5(unsigned long addr) spin_unlock(&pgd_lock); } +/* + * When memory was added make sure all the processes MM have + * suitable PGD entries in the local PGD level page. + */ void arch_sync_kernel_pagetables(unsigned long addr) { if (pgtable_l5_enabled()) @@ -330,7 +254,7 @@ static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr) { if (pgd_none(*pgd)) { p4d_t *p4d = (p4d_t *)spp_getpage(); - pgd_populate(&init_mm, pgd, p4d); + pgd_populate_kernel(vaddr, pgd, p4d); if (p4d != p4d_offset(pgd, 0)) printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n", p4d, p4d_offset(pgd, 0)); @@ -342,7 +266,7 @@ static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr) { if (p4d_none(*p4d)) { pud_t *pud = (pud_t *)spp_getpage(); - p4d_populate(&init_mm, p4d, pud); + p4d_populate_kernel(vaddr, p4d, pud); if (pud != pud_offset(p4d, 0)) printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n", pud, pud_offset(p4d, 0)); @@ -795,7 +719,7 @@ phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end, page_size_mask, prot, init); spin_lock(&init_mm.page_table_lock); - p4d_populate_init(&init_mm, p4d, pud, init); + p4d_populate_kernel_init(vaddr, p4d, pud, init); spin_unlock(&init_mm.page_table_lock); } @@ -808,7 +732,6 @@ __kernel_physical_mapping_init(unsigned long paddr_start, unsigned long page_size_mask, pgprot_t prot, bool init) { - bool pgd_changed = false; unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last; paddr_last = paddr_end; @@ -837,18 +760,14 @@ __kernel_physical_mapping_init(unsigned long paddr_start, spin_lock(&init_mm.page_table_lock); if (pgtable_l5_enabled()) - pgd_populate_init(&init_mm, pgd, p4d, init); + pgd_populate_kernel_init(vaddr, pgd, p4d, init); else - p4d_populate_init(&init_mm, p4d_offset(pgd, vaddr), - (pud_t *) p4d, init); + p4d_populate_kernel_init(vaddr, p4d_offset(pgd, vaddr), + (pud_t *) p4d, init); spin_unlock(&init_mm.page_table_lock); - pgd_changed = true; } - if (pgd_changed) - sync_global_pgds(vaddr_start, vaddr_end - 1); - return paddr_last; } @@ -1642,8 +1561,6 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, err = -ENOMEM; } else err = vmemmap_populate_basepages(start, end, node, NULL); - if (!err) - sync_global_pgds(start, end - 1); return err; } diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 0539efd0d216..e825952d25b2 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -108,7 +108,7 @@ static void __init kasan_populate_p4d(p4d_t *p4d, unsigned long addr, if (p4d_none(*p4d)) { void *p = early_alloc(PAGE_SIZE, nid, true); - p4d_populate(&init_mm, p4d, p); + p4d_populate_kernel(addr, p4d, p); } pud = pud_offset(p4d, addr); @@ -128,7 +128,7 @@ static void __init kasan_populate_pgd(pgd_t *pgd, unsigned long addr, if (pgd_none(*pgd)) { p = early_alloc(PAGE_SIZE, nid, true); - pgd_populate(&init_mm, pgd, p); + pgd_populate_kernel(addr, pgd, p); } p4d = p4d_offset(pgd, addr); @@ -255,7 +255,7 @@ static void __init kasan_shallow_populate_p4ds(pgd_t *pgd, if (p4d_none(*p4d)) { p = early_alloc(PAGE_SIZE, NUMA_NO_NODE, true); - p4d_populate(&init_mm, p4d, p); + p4d_populate_kernel(addr, p4d, p); } } while (p4d++, addr = next, addr != end); } @@ -273,7 +273,7 @@ static void __init kasan_shallow_populate_pgds(void *start, void *end) if (pgd_none(*pgd)) { p = early_alloc(PAGE_SIZE, NUMA_NO_NODE, true); - pgd_populate(&init_mm, pgd, p); + pgd_populate_kernel(addr, pgd, p); } /* -- 2.43.0

4 months

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Re: [PATCH 5.15] fs/proc: do_task_stat: use __for_each_thread()

by Harshit Mogalapalli

Hi, + stable On 05/06/25 19:37, Heyne, Maximilian wrote: > From: Oleg Nesterov <oleg(a)redhat.com> > > [ Upstream commit 7904e53ed5a20fc678c01d5d1b07ec486425bb6a ] > > do/while_each_thread should be avoided when possible. > > Link: https://lkml.kernel.org/r/20230909164501.GA11581@redhat.com > Signed-off-by: Oleg Nesterov <oleg(a)redhat.com> > Cc: Eric W. Biederman <ebiederm(a)xmission.com> > Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org> > Stable-dep-of: 7601df8031fd ("fs/proc: do_task_stat: use sig->stats_lock to=ather the threads/children stats") > [mheyne: adjusted context] > Signed-off-by: Maximilian Heyne <mheyne(a)amazon.de> > --- > > Compile-tested only. > We're seeing soft lock-ups with 5.10.237 because of the backport of > commit 4fe85bdaabd6 ("fs/proc: do_task_stat: use sig->stats_lock to > gather the threads/children stats"). I'm assuming this is broken on 5.15 > too. > Note: We saw this as well after backporting the above mentioned commit from 5.15.y and your backport resolves it for us as well on 5.15.y based branch. Thanks, Harshit > --- > fs/proc/array.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/fs/proc/array.c b/fs/proc/array.c > index 2cb01aaa67187..2ff568dc58387 100644 > --- a/fs/proc/array.c > +++ b/fs/proc/array.c > @@ -530,18 +530,18 @@ static int do_task_stat(struct seq_file *m, struct pi=_namespace *ns, > cgtime = sig->cgtime; > = if (whole) { > - struct task_struct *t = task; > + struct task_struct *t; > = min_flt = sig->min_flt; > maj_flt = sig->maj_flt; > gtime = sig->gtime; > = rcu_read_lock(); > - do { > + __for_each_thread(sig, t) { > min_flt += t->min_flt; > maj_flt += t->maj_flt; > gtime += task_gtime(t); > - } while_each_thread(task, t); > + } > rcu_read_unlock(); > } > } while (need_seqretry(&sig->stats_lock, seq)); > -- =2.47.1 > > > > > Amazon Web Services Development Center Germany GmbH > Tamara-Danz-Str. 13 > 10243 Berlin > Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss > Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B > Sitz: Berlin > Ust-ID: DE 365 538 597 > >

4 months

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v6.16-rc5: ttys: auto login failed Login incorrect

by Naresh Kamboju

Approximately 20% of devices are experiencing intermittent boot failures with this kernel version. The issue appears to be related to auto login failures, where an incorrect password is being detected on the serial console during the login process. This intermittent regression is noticed on stable-rc 6.15.5-rc2 and Linux mainline master v6.16-rc5. This regressions is only specific to the devices not on the qemu's. Test environments: - dragonboard-410c - dragonboard-845c - e850-96 - juno-r2 - rk3399-rock-pi-4b - x86 Regression Analysis: - New regression? Yes - Reproducibility? 20% only Test regression: 6.15.5-rc2 v6.16-rc5 auto login failed Login incorrect Reported-by: Linux Kernel Functional Testing <lkft(a)linaro.org> ## log in problem runner-ns46nmmj-project-40964107-concurrent-0 login: # Password: Login incorrect runner-ns46nmmj-project-40964107-concurrent-0 login: ## Investigation The following three patches were reverted and the system was re-tested. The previously reported issues are no longer observed after applying the reverts. serial: imx: Restore original RXTL for console to fix data loss commit f23c52aafb1675ab1d1f46914556d8e29cbbf7b3 upstream. serial: core: restore of_node information in sysfs commit d36f0e9a0002f04f4d6dd9be908d58fe5bd3a279 upstream. tty: serial: uartlite: register uart driver in init [ Upstream commit 6bd697b5fc39fd24e2aa418c7b7d14469f550a93 ] Reference bug report lore link, - https://lore.kernel.org/stable/CA+G9fYvidpyHTQ179dAJ4TSdhthC-Mtjuks5iQjMf+o… ## Test links * log 1: https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.15.y/build/v6.15… * log 2: https://qa-reports.linaro.org/api/testruns/29021720/log_file/ * log 3: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.16-rc5/te… * Boot test: https://regressions.linaro.org/lkft/linux-stable-rc-linux-6.15.y/v6.15.4-26… * LAVA jobs 1: https://lkft.validation.linaro.org/scheduler/job/8344153#L1186 * LAVA jobs 2: https://lkft.validation.linaro.org/scheduler/job/8343870#L1266 ## Build * kernel: 6.15.5-rc2 * git: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git * git commit: f6977c36decb0875e78bdb8599749bce1e84c753 * git describe: v6.15.4-264-gf6977c36decb * test details: https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.15.y/build/v6.15… ## Test Regressions (compared to v6.15.3-590-gd93bc5feded1) * dragonboard-410c, boot - clang-20-lkftconfig - clang-nightly-lkftconfig-kselftest - gcc-13-lkftconfig-debug * dragonboard-845c, boot - clang-20-lkftconfig - korg-clang-20-lkftconfig-lto-thing * dragonboard-845c-compat, boot - gcc-13-lkftconfig-compat * e850-96, boot - gcc-13-lkftconfig-no-kselftest-frag * juno-r2, boot - clang-20-lkftconfig - gcc-13-lkftconfig-debug - gcc-13-lkftconfig-kselftest * rk3399-rock-pi-4b, boot - clang-20-lkftconfig * x86, boot - clang-20-lkftconfig - clang-20-lkftconfig-no-kselftest-frag - clang-nightly-lkftconfig-kselftest - clang-nightly-lkftconfig-lto-thing - gcc-13-defconfig-preempt_rt - gcc-13-lkftconfig-no-kselftest-frag -- Linaro LKFT https://lkft.linaro.org

4 months

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[PATCH v2 1/2] KVM: arm64: Fix enforcement of upper bound on MDCR_EL2.HPMN

by Ben Horgan

Previously, u64_replace_bits() was used to no effect as the return value was ignored. Convert to u64p_replace_bits() so the value is updated in place. Reviewed-by: Zenghui Yu <yuzenghui(a)huawei.com> Signed-off-by: Ben Horgan <ben.horgan(a)arm.com> Fixes: efff9dd2fee7 ("KVM: arm64: Handle out-of-bound write to MDCR_EL2.HPMN") Cc: Marc Zyngier <maz(a)kernel.org> Cc: stable(a)vger.kernel.org --- arch/arm64/kvm/sys_regs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 76c2f0da821f..c20bd6f21e60 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -2624,7 +2624,7 @@ static bool access_mdcr(struct kvm_vcpu *vcpu, */ if (hpmn > vcpu->kvm->arch.nr_pmu_counters) { hpmn = vcpu->kvm->arch.nr_pmu_counters; - u64_replace_bits(val, hpmn, MDCR_EL2_HPMN); + u64p_replace_bits(&val, hpmn, MDCR_EL2_HPMN); } __vcpu_assign_sys_reg(vcpu, MDCR_EL2, val); -- 2.43.0

4 months

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[PATCH net 1/3] net: libwx: remove duplicate page_pool_put_full_page()

by Jiawen Wu

page_pool_put_full_page() should only be invoked when freeing Rx buffers or building a skb if the size is too short. At other times, the pages need to be reused. So remove the redundant page put. In the original code, double free pages cause kernel panic: [ 876.949834] __irq_exit_rcu+0xc7/0x130 [ 876.949836] common_interrupt+0xb8/0xd0 [ 876.949838] </IRQ> [ 876.949838] <TASK> [ 876.949840] asm_common_interrupt+0x22/0x40 [ 876.949841] RIP: 0010:cpuidle_enter_state+0xc2/0x420 [ 876.949843] Code: 00 00 e8 d1 1d 5e ff e8 ac f0 ff ff 49 89 c5 0f 1f 44 00 00 31 ff e8 cd fc 5c ff 45 84 ff 0f 85 40 02 00 00 fb 0f 1f 44 00 00 <45> 85 f6 0f 88 84 01 00 00 49 63 d6 48 8d 04 52 48 8d 04 82 49 8d [ 876.949844] RSP: 0018:ffffaa7340267e78 EFLAGS: 00000246 [ 876.949845] RAX: ffff9e3f135be000 RBX: 0000000000000002 RCX: 0000000000000000 [ 876.949846] RDX: 000000cc2dc4cb7c RSI: ffffffff89ee49ae RDI: ffffffff89ef9f9e [ 876.949847] RBP: ffff9e378f940800 R08: 0000000000000002 R09: 00000000000000ed [ 876.949848] R10: 000000000000afc8 R11: ffff9e3e9e5a9b6c R12: ffffffff8a6d8580 [ 876.949849] R13: 000000cc2dc4cb7c R14: 0000000000000002 R15: 0000000000000000 [ 876.949852] ? cpuidle_enter_state+0xb3/0x420 [ 876.949855] cpuidle_enter+0x29/0x40 [ 876.949857] cpuidle_idle_call+0xfd/0x170 [ 876.949859] do_idle+0x7a/0xc0 [ 876.949861] cpu_startup_entry+0x25/0x30 [ 876.949862] start_secondary+0x117/0x140 [ 876.949864] common_startup_64+0x13e/0x148 [ 876.949867] </TASK> [ 876.949868] ---[ end trace 0000000000000000 ]--- [ 876.949869] ------------[ cut here ]------------ [ 876.949870] list_del corruption, ffffead40445a348->next is NULL [ 876.949873] WARNING: CPU: 14 PID: 0 at lib/list_debug.c:52 __list_del_entry_valid_or_report+0x67/0x120 [ 876.949875] Modules linked in: snd_hrtimer(E) bnep(E) binfmt_misc(E) amdgpu(E) squashfs(E) vfat(E) loop(E) fat(E) amd_atl(E) snd_hda_codec_realtek(E) intel_rapl_msr(E) snd_hda_codec_generic(E) intel_rapl_common(E) snd_hda_scodec_component(E) snd_hda_codec_hdmi(E) snd_hda_intel(E) edac_mce_amd(E) snd_intel_dspcfg(E) snd_hda_codec(E) snd_hda_core(E) amdxcp(E) kvm_amd(E) snd_hwdep(E) gpu_sched(E) drm_panel_backlight_quirks(E) cec(E) snd_pcm(E) drm_buddy(E) snd_seq_dummy(E) drm_ttm_helper(E) btusb(E) kvm(E) snd_seq_oss(E) btrtl(E) ttm(E) btintel(E) snd_seq_midi(E) btbcm(E) drm_exec(E) snd_seq_midi_event(E) i2c_algo_bit(E) snd_rawmidi(E) bluetooth(E) drm_suballoc_helper(E) irqbypass(E) snd_seq(E) ghash_clmulni_intel(E) sha512_ssse3(E) drm_display_helper(E) aesni_intel(E) snd_seq_device(E) rfkill(E) snd_timer(E) gf128mul(E) drm_client_lib(E) drm_kms_helper(E) snd(E) i2c_piix4(E) joydev(E) soundcore(E) wmi_bmof(E) ccp(E) k10temp(E) i2c_smbus(E) gpio_amdpt(E) i2c_designware_platform(E) gpio_generic(E) sg(E) [ 876.949914] i2c_designware_core(E) sch_fq_codel(E) parport_pc(E) drm(E) ppdev(E) lp(E) parport(E) fuse(E) nfnetlink(E) ip_tables(E) ext4 crc16 mbcache jbd2 sd_mod sfp mdio_i2c i2c_core txgbe ahci ngbe pcs_xpcs libahci libwx r8169 phylink libata realtek ptp pps_core video wmi [ 876.949933] CPU: 14 UID: 0 PID: 0 Comm: swapper/14 Kdump: loaded Tainted: G W E 6.16.0-rc2+ #20 PREEMPT(voluntary) [ 876.949935] Tainted: [W]=WARN, [E]=UNSIGNED_MODULE [ 876.949936] Hardware name: Micro-Star International Co., Ltd. MS-7E16/X670E GAMING PLUS WIFI (MS-7E16), BIOS 1.90 12/31/2024 [ 876.949936] RIP: 0010:__list_del_entry_valid_or_report+0x67/0x120 [ 876.949938] Code: 00 00 00 48 39 7d 08 0f 85 a6 00 00 00 5b b8 01 00 00 00 5d 41 5c e9 73 0d 93 ff 48 89 fe 48 c7 c7 a0 31 e8 89 e8 59 7c b3 ff <0f> 0b 31 c0 5b 5d 41 5c e9 57 0d 93 ff 48 89 fe 48 c7 c7 c8 31 e8 [ 876.949940] RSP: 0018:ffffaa73405d0c60 EFLAGS: 00010282 [ 876.949941] RAX: 0000000000000000 RBX: ffffead40445a348 RCX: 0000000000000000 [ 876.949942] RDX: 0000000000000105 RSI: 0000000000000001 RDI: 00000000ffffffff [ 876.949943] RBP: 0000000000000000 R08: 000000010006dfde R09: ffffffff8a47d150 [ 876.949944] R10: ffffffff8a47d150 R11: 0000000000000003 R12: dead000000000122 [ 876.949945] R13: ffff9e3e9e5af700 R14: ffffead40445a348 R15: ffff9e3e9e5af720 [ 876.949946] FS: 0000000000000000(0000) GS:ffff9e3f135be000(0000) knlGS:0000000000000000 [ 876.949947] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 876.949948] CR2: 00007fa58b480048 CR3: 0000000156724000 CR4: 0000000000750ef0 [ 876.949949] PKRU: 55555554 [ 876.949950] Call Trace: [ 876.949951] <IRQ> [ 876.949952] __rmqueue_pcplist+0x53/0x2c0 [ 876.949955] alloc_pages_bulk_noprof+0x2e0/0x660 [ 876.949958] __page_pool_alloc_pages_slow+0xa9/0x400 [ 876.949961] page_pool_alloc_pages+0xa/0x20 [ 876.949963] wx_alloc_rx_buffers+0xd7/0x110 [libwx] [ 876.949967] wx_clean_rx_irq+0x262/0x430 [libwx] [ 876.949971] wx_poll+0x92/0x130 [libwx] [ 876.949975] __napi_poll+0x28/0x190 [ 876.949977] net_rx_action+0x301/0x3f0 [ 876.949980] ? srso_alias_return_thunk+0x5/0xfbef5 [ 876.949981] ? profile_tick+0x30/0x70 [ 876.949983] ? srso_alias_return_thunk+0x5/0xfbef5 [ 876.949984] ? srso_alias_return_thunk+0x5/0xfbef5 [ 876.949986] ? timerqueue_add+0xa3/0xc0 [ 876.949988] ? srso_alias_return_thunk+0x5/0xfbef5 [ 876.949989] ? __raise_softirq_irqoff+0x16/0x70 [ 876.949991] ? srso_alias_return_thunk+0x5/0xfbef5 [ 876.949993] ? srso_alias_return_thunk+0x5/0xfbef5 [ 876.949994] ? wx_msix_clean_rings+0x41/0x50 [libwx] [ 876.949998] handle_softirqs+0xf9/0x2c0 Fixes: 3c47e8ae113a ("net: libwx: Support to receive packets in NAPI") Cc: stable(a)vger.kernel.org Signed-off-by: Jiawen Wu <jiawenwu(a)trustnetic.com> --- drivers/net/ethernet/wangxun/libwx/wx_lib.c | 11 ----------- 1 file changed, 11 deletions(-) diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_lib.c index 55e252789db3..7e3d7fb61a52 100644 --- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c +++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c @@ -174,10 +174,6 @@ static void wx_dma_sync_frag(struct wx_ring *rx_ring, skb_frag_off(frag), skb_frag_size(frag), DMA_FROM_DEVICE); - - /* If the page was released, just unmap it. */ - if (unlikely(WX_CB(skb)->page_released)) - page_pool_put_full_page(rx_ring->page_pool, rx_buffer->page, false); } static struct wx_rx_buffer *wx_get_rx_buffer(struct wx_ring *rx_ring, @@ -227,10 +223,6 @@ static void wx_put_rx_buffer(struct wx_ring *rx_ring, struct sk_buff *skb, int rx_buffer_pgcnt) { - if (!IS_ERR(skb) && WX_CB(skb)->dma == rx_buffer->dma) - /* the page has been released from the ring */ - WX_CB(skb)->page_released = true; - /* clear contents of rx_buffer */ rx_buffer->page = NULL; rx_buffer->skb = NULL; @@ -2423,9 +2415,6 @@ static void wx_clean_rx_ring(struct wx_ring *rx_ring) if (rx_buffer->skb) { struct sk_buff *skb = rx_buffer->skb; - if (WX_CB(skb)->page_released) - page_pool_put_full_page(rx_ring->page_pool, rx_buffer->page, false); - dev_kfree_skb(skb); } -- 2.48.1

4 months

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[PATCH net 3/3] net: libwx: properly reset Rx ring descriptor

by Jiawen Wu

When device reset is triggered by feature changes such as toggling Rx VLAN offload, wx->do_reset() is called to reinitialize Rx rings. The hardware descriptor ring may retain stale values from previous sessions. And only set the length to 0 in rx_desc[0] would result in building malformed SKBs. Fix it to ensure a clean slate after device reset. [ 549.186435] [ C16] ------------[ cut here ]------------ [ 549.186457] [ C16] kernel BUG at net/core/skbuff.c:2814! [ 549.186468] [ C16] Oops: invalid opcode: 0000 [#1] SMP NOPTI [ 549.186472] [ C16] CPU: 16 UID: 0 PID: 0 Comm: swapper/16 Kdump: loaded Not tainted 6.16.0-rc4+ #23 PREEMPT(voluntary) [ 549.186476] [ C16] Hardware name: Micro-Star International Co., Ltd. MS-7E16/X670E GAMING PLUS WIFI (MS-7E16), BIOS 1.90 12/31/2024 [ 549.186478] [ C16] RIP: 0010:__pskb_pull_tail+0x3ff/0x510 [ 549.186484] [ C16] Code: 06 f0 ff 4f 34 74 7b 4d 8b 8c 24 c8 00 00 00 45 8b 84 24 c0 00 00 00 e9 c8 fd ff ff 48 c7 44 24 08 00 00 00 00 e9 5e fe ff ff <0f> 0b 31 c0 e9 23 90 5b ff 41 f7 c6 ff 0f 00 00 75 bf 49 8b 06 a8 [ 549.186487] [ C16] RSP: 0018:ffffb391c0640d70 EFLAGS: 00010282 [ 549.186490] [ C16] RAX: 00000000fffffff2 RBX: ffff8fe7e4d40200 RCX: 00000000fffffff2 [ 549.186492] [ C16] RDX: ffff8fe7c3a4bf8e RSI: 0000000000000180 RDI: ffff8fe7c3a4bf40 [ 549.186494] [ C16] RBP: ffffb391c0640da8 R08: ffff8fe7c3a4c0c0 R09: 000000000000000e [ 549.186496] [ C16] R10: ffffb391c0640d88 R11: 000000000000000e R12: ffff8fe7e4d40200 [ 549.186497] [ C16] R13: 00000000fffffff2 R14: ffff8fe7fa01a000 R15: 00000000fffffff2 [ 549.186499] [ C16] FS: 0000000000000000(0000) GS:ffff8fef5ae40000(0000) knlGS:0000000000000000 [ 549.186502] [ C16] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 549.186503] [ C16] CR2: 00007f77d81d6000 CR3: 000000051a032000 CR4: 0000000000750ef0 [ 549.186505] [ C16] PKRU: 55555554 [ 549.186507] [ C16] Call Trace: [ 549.186510] [ C16] <IRQ> [ 549.186513] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5 [ 549.186517] [ C16] __skb_pad+0xc7/0xf0 [ 549.186523] [ C16] wx_clean_rx_irq+0x355/0x3b0 [libwx] [ 549.186533] [ C16] wx_poll+0x92/0x120 [libwx] [ 549.186540] [ C16] __napi_poll+0x28/0x190 [ 549.186544] [ C16] net_rx_action+0x301/0x3f0 [ 549.186548] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5 [ 549.186551] [ C16] ? __raw_spin_lock_irqsave+0x1e/0x50 [ 549.186554] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5 [ 549.186557] [ C16] ? wake_up_nohz_cpu+0x35/0x160 [ 549.186559] [ C16] ? srso_alias_return_thunk+0x5/0xfbef5 [ 549.186563] [ C16] handle_softirqs+0xf9/0x2c0 [ 549.186568] [ C16] __irq_exit_rcu+0xc7/0x130 [ 549.186572] [ C16] common_interrupt+0xb8/0xd0 [ 549.186576] [ C16] </IRQ> [ 549.186577] [ C16] <TASK> [ 549.186579] [ C16] asm_common_interrupt+0x22/0x40 [ 549.186582] [ C16] RIP: 0010:cpuidle_enter_state+0xc2/0x420 [ 549.186585] [ C16] Code: 00 00 e8 11 0e 5e ff e8 ac f0 ff ff 49 89 c5 0f 1f 44 00 00 31 ff e8 0d ed 5c ff 45 84 ff 0f 85 40 02 00 00 fb 0f 1f 44 00 00 <45> 85 f6 0f 88 84 01 00 00 49 63 d6 48 8d 04 52 48 8d 04 82 49 8d [ 549.186587] [ C16] RSP: 0018:ffffb391c0277e78 EFLAGS: 00000246 [ 549.186590] [ C16] RAX: ffff8fef5ae40000 RBX: 0000000000000003 RCX: 0000000000000000 [ 549.186591] [ C16] RDX: 0000007fde0faac5 RSI: ffffffff826e53f6 RDI: ffffffff826fa9b3 [ 549.186593] [ C16] RBP: ffff8fe7c3a20800 R08: 0000000000000002 R09: 0000000000000000 [ 549.186595] [ C16] R10: 0000000000000000 R11: 000000000000ffff R12: ffffffff82ed7a40 [ 549.186596] [ C16] R13: 0000007fde0faac5 R14: 0000000000000003 R15: 0000000000000000 [ 549.186601] [ C16] ? cpuidle_enter_state+0xb3/0x420 [ 549.186605] [ C16] cpuidle_enter+0x29/0x40 [ 549.186609] [ C16] cpuidle_idle_call+0xfd/0x170 [ 549.186613] [ C16] do_idle+0x7a/0xc0 [ 549.186616] [ C16] cpu_startup_entry+0x25/0x30 [ 549.186618] [ C16] start_secondary+0x117/0x140 [ 549.186623] [ C16] common_startup_64+0x13e/0x148 [ 549.186628] [ C16] </TASK> Fixes: 3c47e8ae113a ("net: libwx: Support to receive packets in NAPI") Cc: stable(a)vger.kernel.org Signed-off-by: Jiawen Wu <jiawenwu(a)trustnetic.com> --- drivers/net/ethernet/wangxun/libwx/wx_hw.c | 7 +++---- drivers/net/ethernet/wangxun/libwx/wx_lib.c | 5 +++++ 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/wangxun/libwx/wx_hw.c b/drivers/net/ethernet/wangxun/libwx/wx_hw.c index a9519997286b..9002b97e148e 100644 --- a/drivers/net/ethernet/wangxun/libwx/wx_hw.c +++ b/drivers/net/ethernet/wangxun/libwx/wx_hw.c @@ -1912,7 +1912,6 @@ static void wx_configure_rx_ring(struct wx *wx, struct wx_ring *ring) { u16 reg_idx = ring->reg_idx; - union wx_rx_desc *rx_desc; u64 rdba = ring->dma; u32 rxdctl; @@ -1942,9 +1941,9 @@ static void wx_configure_rx_ring(struct wx *wx, memset(ring->rx_buffer_info, 0, sizeof(struct wx_rx_buffer) * ring->count); - /* initialize Rx descriptor 0 */ - rx_desc = WX_RX_DESC(ring, 0); - rx_desc->wb.upper.length = 0; + /* reset ntu and ntc to place SW in sync with hardwdare */ + ring->next_to_clean = 0; + ring->next_to_use = 0; /* enable receive descriptor ring */ wr32m(wx, WX_PX_RR_CFG(reg_idx), diff --git a/drivers/net/ethernet/wangxun/libwx/wx_lib.c b/drivers/net/ethernet/wangxun/libwx/wx_lib.c index c91487909811..0213ad5a6ceb 100644 --- a/drivers/net/ethernet/wangxun/libwx/wx_lib.c +++ b/drivers/net/ethernet/wangxun/libwx/wx_lib.c @@ -357,6 +357,8 @@ void wx_alloc_rx_buffers(struct wx_ring *rx_ring, u16 cleaned_count) /* clear the status bits for the next_to_use descriptor */ rx_desc->wb.upper.status_error = 0; + /* clear the length for the next_to_use descriptor */ + rx_desc->wb.upper.length = 0; cleaned_count--; } while (cleaned_count); @@ -2438,6 +2440,9 @@ static void wx_clean_rx_ring(struct wx_ring *rx_ring) } } + /* Zero out the descriptor ring */ + memset(rx_ring->desc, 0, rx_ring->size); + rx_ring->next_to_alloc = 0; rx_ring->next_to_clean = 0; rx_ring->next_to_use = 0; -- 2.48.1

4 months

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