On Tue, Jul 29, 2025 at 09:03:47AM +0000, Jakub Acs wrote:
From: Liu Shixin liushixin2@huawei.com
commit f1897f2f08b28ae59476d8b73374b08f856973af upstream.
syzkaller reported such a BUG_ON():
------------[ cut here ]------------ kernel BUG at mm/khugepaged.c:1835! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP ... CPU: 6 UID: 0 PID: 8009 Comm: syz.15.106 Kdump: loaded Tainted: G W 6.13.0-rc6 #22 Tainted: [W]=WARN Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : collapse_file+0xa44/0x1400 lr : collapse_file+0x88/0x1400 sp : ffff80008afe3a60 ... Call trace: collapse_file+0xa44/0x1400 (P) hpage_collapse_scan_file+0x278/0x400 madvise_collapse+0x1bc/0x678 madvise_vma_behavior+0x32c/0x448 madvise_walk_vmas.constprop.0+0xbc/0x140 do_madvise.part.0+0xdc/0x2c8 __arm64_sys_madvise+0x68/0x88 invoke_syscall+0x50/0x120 el0_svc_common.constprop.0+0xc8/0xf0 do_el0_svc+0x24/0x38 el0_svc+0x34/0x128 el0t_64_sync_handler+0xc8/0xd0 el0t_64_sync+0x190/0x198
This indicates that the pgoff is unaligned. After analysis, I confirm the vma is mapped to /dev/zero. Such a vma certainly has vm_file, but it is set to anonymous by mmap_zero(). So even if it's mmapped by 2m-unaligned, it can pass the check in thp_vma_allowable_order() as it is an anonymous-mmap, but then be collapsed as a file-mmap.
It seems the problem has existed for a long time, but actually, since we have khugepaged_max_ptes_none check before, we will skip collapse it as it is /dev/zero and so has no present page. But commit d8ea7cc8547c limit the check for only khugepaged, so the BUG_ON() can be triggered by madvise_collapse().
Add vma_is_anonymous() check to make such vma be processed by hpage_collapse_scan_pmd().
Link: https://lkml.kernel.org/r/20250111034511.2223353-1-liushixin2@huawei.com Fixes: d8ea7cc8547c ("mm/khugepaged: add flag to predicate khugepaged-only behavior") Signed-off-by: Liu Shixin liushixin2@huawei.com Reviewed-by: Yang Shi yang@os.amperecomputing.com Acked-by: David Hildenbrand david@redhat.com Cc: Chengming Zhou chengming.zhou@linux.dev Cc: Johannes Weiner hannes@cmpxchg.org Cc: Kefeng Wang wangkefeng.wang@huawei.com Cc: Mattew Wilcox willy@infradead.org Cc: Muchun Song muchun.song@linux.dev Cc: Nanyong Sun sunnanyong@huawei.com Cc: Qi Zheng zhengqi.arch@bytedance.com Signed-off-by: Andrew Morton akpm@linux-foundation.org [acsjakub: backport, clean apply] Cc: Jakub Acs acsjakub@amazon.de
You need to sign off on patches you forward on. Please fix that up and resend all of these.
thanks,
greg -h