Hi Thomas,
Saw a fix from Yunxiang for this: https://patchwork.freedesktop.org/patch/543652/?series=119697&rev=1
Regards,
Nirmoy
On 6/22/2023 12:14 PM, Thomas Hellström wrote:
The value of pos->first was not updated when the first resource of the range was moved. This could lead to errors like the one below. Fix this by updating pos->first when needed.
<3> [218.963342] BUG: KASAN: null-ptr-deref in ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.963456] Read of size 8 at addr 0000000000000038 by task xe_evict/1529 <3> [218.963546] <3> [218.963566] CPU: 0 PID: 1529 Comm: xe_evict Not tainted 6.3.0-xe #1 <3> [218.963664] Hardware name: Intel Corporation Tiger Lake Client Platform/TigerLake H DDR4 SODIMM RVP, BIOS TGLSFWI1.R00.4064.A00.2102041619 02/04/2021 <3> [218.963841] Call Trace: <3> [218.963881] <TASK> <3> [218.963915] dump_stack_lvl+0x64/0xb0 <3> [218.963976] print_report+0x3e5/0x600 <3> [218.964036] ? ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.964127] kasan_report+0x96/0xc0 <3> [218.964183] ? ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.964276] ttm_lru_bulk_move_del+0xc5/0x180 [ttm] <3> [218.964365] ttm_bo_set_bulk_move+0x92/0x140 [ttm] <3> [218.964454] xe_gem_object_close+0xc8/0x120 [xe] <3> [218.964675] ? __pfx_xe_gem_object_close+0x10/0x10 [xe] <3> [218.964908] ? drm_gem_object_handle_put_unlocked+0xc7/0x170 [drm] <3> [218.965071] drm_gem_object_release_handle+0x45/0x80 [drm] <3> [218.965220] ? __pfx_drm_gem_object_release_handle+0x10/0x10 [drm] <3> [218.965381] idr_for_each+0xc9/0x180 <3> [218.965437] ? __pfx_idr_for_each+0x10/0x10 <3> [218.965504] drm_gem_release+0x20/0x30 [drm] <3> [218.965637] drm_file_free.part.0+0x4cb/0x4f0 [drm] <3> [218.965778] ? drm_close_helper.isra.0+0xb7/0xe0 [drm] <3> [218.965921] drm_release_noglobal+0x49/0x90 [drm] <3> [218.966061] __fput+0x122/0x450 <3> [218.966115] task_work_run+0xfe/0x190 <3> [218.966175] ? __pfx_task_work_run+0x10/0x10 <3> [218.966239] ? do_raw_spin_unlock+0xa7/0x140 <3> [218.966308] do_exit+0x55f/0x1430 <3> [218.966364] ? __pfx_lock_release+0x10/0x10 <3> [218.966431] ? do_raw_spin_lock+0x11d/0x1e0 <3> [218.966498] ? __pfx_do_exit+0x10/0x10 <3> [218.966554] ? __pfx_do_raw_spin_lock+0x10/0x10 <3> [218.966625] ? mark_held_locks+0x24/0x90 <3> [218.966688] ? lockdep_hardirqs_on_prepare+0x136/0x210 <3> [218.966768] do_group_exit+0x68/0x110 <3> [218.966828] __x64_sys_exit_group+0x2c/0x30 <3> [218.966896] do_syscall_64+0x3c/0x90 <3> [218.966955] entry_SYSCALL_64_after_hwframe+0x72/0xdc <3> [218.967035] RIP: 0033:0x7f77b194f146 <3> [218.967094] Code: Unable to access opcode bytes at 0x7f77b194f11c. <3> [218.967174] RSP: 002b:00007ffc64791188 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 <3> [218.967271] RAX: ffffffffffffffda RBX: 00007f77b1a548a0 RCX: 00007f77b194f146 <3> [218.967364] RDX: 0000000000000062 RSI: 000000000000003c RDI: 0000000000000062 <3> [218.967458] RBP: 0000000000000062 R08: 00000000000000e7 R09: ffffffffffffff78 <3> [218.967553] R10: 0000000000000058 R11: 0000000000000246 R12: 00007f77b1a548a0 <3> [218.967648] R13: 0000000000000003 R14: 00007f77b1a5d2e8 R15: 0000000000000000 <3> [218.967745] </TASK>
Fixes: fee2ede15542 ("drm/ttm: rework bulk move handling v5") Cc: "Christian König" christian.koenig@amd.com Cc: "Christian König" ckoenig.leichtzumerken@gmail.com Cc: Daniel Vetter daniel.vetter@ffwll.ch Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v5.19+ Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/411 Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com
drivers/gpu/drm/ttm/ttm_resource.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c index 7333f7a87a2f..cb05e0a36576 100644 --- a/drivers/gpu/drm/ttm/ttm_resource.c +++ b/drivers/gpu/drm/ttm/ttm_resource.c @@ -86,6 +86,8 @@ static void ttm_lru_bulk_move_pos_tail(struct ttm_lru_bulk_move_pos *pos, struct ttm_resource *res) { if (pos->last != res) {
if (pos->first == res)pos->first = list_next_entry(res, lru);