On Mon, Mar 04, 2024 at 06:01:46PM +0100, Danilo Krummrich wrote: > This bug is present in v6.7 only, since the scheduler design has been > re-worked in v6.8. > > Client scheduler entities must be flushed before an associated GPU > scheduler is teared down. Otherwise the entitiy might still hold a > pointer to the scheduler's runqueue which is freed at scheduler tear > down already. > > [ 305.224293] ================================================================== > [ 305.224297] BUG: KASAN: slab-use-after-free in drm_sched_entity_flush+0x6c4/0x7b0 [gpu_sched] > [ 305.224310] Read of size 8 at addr ffff8881440a8f48 by task rmmod/4436 > > [ 305.224317] CPU: 10 PID: 4436 Comm: rmmod Tainted: G U 6.7.6-100.fc38.x86_64+debug #1 > [ 305.224321] Hardware name: Dell Inc. Precision 7550/01PXFR, BIOS 1.27.0 11/08/2023 > [ 305.224324] Call Trace: > [ 305.224327] <TASK> > [ 305.224329] dump_stack_lvl+0x76/0xd0 > [ 305.224336] print_report+0xcf/0x670 > [ 305.224342] ? drm_sched_entity_flush+0x6c4/0x7b0 [gpu_sched] > [ 305.224352] ? __virt_addr_valid+0x215/0x410 > [ 305.224359] ? drm_sched_entity_flush+0x6c4/0x7b0 [gpu_sched] > [ 305.224368] kasan_report+0xa6/0xe0 > [ 305.224373] ? drm_sched_entity_flush+0x6c4/0x7b0 [gpu_sched] > [ 305.224385] drm_sched_entity_flush+0x6c4/0x7b0 [gpu_sched] > [ 305.224395] ? __pfx_drm_sched_entity_flush+0x10/0x10 [gpu_sched] > [ 305.224406] ? rcu_is_watching+0x15/0xb0 > [ 305.224413] drm_sched_entity_destroy+0x17/0x20 [gpu_sched] > [ 305.224422] nouveau_cli_fini+0x6c/0x120 [nouveau] > [ 305.224658] nouveau_drm_device_fini+0x2ac/0x490 [nouveau] > [ 305.224871] nouveau_drm_remove+0x18e/0x220 [nouveau] > [ 305.225082] ? __pfx_nouveau_drm_remove+0x10/0x10 [nouveau] > [ 305.225290] ? rcu_is_watching+0x15/0xb0 > [ 305.225295] ? _raw_spin_unlock_irqrestore+0x66/0x80 > [ 305.225299] ? trace_hardirqs_on+0x16/0x100 > [ 305.225304] ? _raw_spin_unlock_irqrestore+0x4f/0x80 > [ 305.225310] pci_device_remove+0xa3/0x1d0 > [ 305.225316] device_release_driver_internal+0x379/0x540 > [ 305.225322] driver_detach+0xc5/0x180 > [ 305.225327] bus_remove_driver+0x11e/0x2a0 > [ 305.225333] pci_unregister_driver+0x2a/0x250 > [ 305.225339] nouveau_drm_exit+0x1f/0x970 [nouveau] > [ 305.225548] __do_sys_delete_module+0x350/0x580 > [ 305.225554] ? __pfx___do_sys_delete_module+0x10/0x10 > [ 305.225562] ? syscall_enter_from_user_mode+0x26/0x90 > [ 305.225567] ? rcu_is_watching+0x15/0xb0 > [ 305.225571] ? syscall_enter_from_user_mode+0x26/0x90 > [ 305.225575] ? trace_hardirqs_on+0x16/0x100 > [ 305.225580] do_syscall_64+0x61/0xe0 > [ 305.225584] ? rcu_is_watching+0x15/0xb0 > [ 305.225587] ? syscall_exit_to_user_mode+0x1f/0x50 > [ 305.225592] ? trace_hardirqs_on_prepare+0xe3/0x100 > [ 305.225596] ? do_syscall_64+0x70/0xe0 > [ 305.225600] ? trace_hardirqs_on_prepare+0xe3/0x100 > [ 305.225604] entry_SYSCALL_64_after_hwframe+0x6e/0x76 > [ 305.225609] RIP: 0033:0x7f6148f3592b > [ 305.225650] Code: 73 01 c3 48 8b 0d dd 04 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ad 04 0c 00 f7 d8 64 89 01 48 > [ 305.225653] RSP: 002b:00007ffe89986f08 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 > [ 305.225659] RAX: ffffffffffffffda RBX: 000055cbb036e900 RCX: 00007f6148f3592b > [ 305.225662] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055cbb036e968 > [ 305.225664] RBP: 00007ffe89986f30 R08: 1999999999999999 R09: 0000000000000000 > [ 305.225667] R10: 00007f6148fa6ac0 R11: 0000000000000206 R12: 0000000000000000 > [ 305.225670] R13: 00007ffe89987190 R14: 000055cbb036e900 R15: 0000000000000000 > [ 305.225678] </TASK> > > [ 305.225683] Allocated by task 484: > [ 305.225685] kasan_save_stack+0x33/0x60 > [ 305.225690] kasan_set_track+0x25/0x30 > [ 305.225693] __kasan_kmalloc+0x8f/0xa0 > [ 305.225696] drm_sched_init+0x3c7/0xce0 [gpu_sched] > [ 305.225705] nouveau_sched_init+0xd2/0x110 [nouveau] > [ 305.225913] nouveau_drm_device_init+0x130/0x3290 [nouveau] > [ 305.226121] nouveau_drm_probe+0x1ab/0x6b0 [nouveau] > [ 305.226329] local_pci_probe+0xda/0x190 > [ 305.226333] pci_device_probe+0x23a/0x780 > [ 305.226337] really_probe+0x3df/0xb80 > [ 305.226341] __driver_probe_device+0x18c/0x450 > [ 305.226345] driver_probe_device+0x4a/0x120 > [ 305.226348] __driver_attach+0x1e5/0x4a0 > [ 305.226351] bus_for_each_dev+0x106/0x190 > [ 305.226355] bus_add_driver+0x2a1/0x570 > [ 305.226358] driver_register+0x134/0x460 > [ 305.226361] do_one_initcall+0xd3/0x430 > [ 305.226366] do_init_module+0x238/0x770 > [ 305.226370] load_module+0x5581/0x6f10 > [ 305.226374] __do_sys_init_module+0x1f2/0x220 > [ 305.226377] do_syscall_64+0x61/0xe0 > [ 305.226381] entry_SYSCALL_64_after_hwframe+0x6e/0x76 > > [ 305.226387] Freed by task 4436: > [ 305.226389] kasan_save_stack+0x33/0x60 > [ 305.226392] kasan_set_track+0x25/0x30 > [ 305.226396] kasan_save_free_info+0x2b/0x50 > [ 305.226399] __kasan_slab_free+0x10b/0x1a0 > [ 305.226402] slab_free_freelist_hook+0x12b/0x1e0 > [ 305.226406] __kmem_cache_free+0xd4/0x1d0 > [ 305.226410] drm_sched_fini+0x178/0x320 [gpu_sched] > [ 305.226418] nouveau_drm_device_fini+0x2a0/0x490 [nouveau] > [ 305.226624] nouveau_drm_remove+0x18e/0x220 [nouveau] > [ 305.226832] pci_device_remove+0xa3/0x1d0 > [ 305.226836] device_release_driver_internal+0x379/0x540 > [ 305.226840] driver_detach+0xc5/0x180 > [ 305.226843] bus_remove_driver+0x11e/0x2a0 > [ 305.226847] pci_unregister_driver+0x2a/0x250 > [ 305.226850] nouveau_drm_exit+0x1f/0x970 [nouveau] > [ 305.227056] __do_sys_delete_module+0x350/0x580 > [ 305.227060] do_syscall_64+0x61/0xe0 > [ 305.227064] entry_SYSCALL_64_after_hwframe+0x6e/0x76 > > [ 305.227070] The buggy address belongs to the object at ffff8881440a8f00 > which belongs to the cache kmalloc-128 of size 128 > [ 305.227073] The buggy address is located 72 bytes inside of > freed 128-byte region [ffff8881440a8f00, ffff8881440a8f80) > > [ 305.227078] The buggy address belongs to the physical page: > [ 305.227081] page:00000000627efa0a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1440a8 > [ 305.227085] head:00000000627efa0a order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 > [ 305.227088] flags: 0x17ffffc0000840(slab|head|node=0|zone=2|lastcpupid=0x1fffff) > [ 305.227093] page_type: 0xffffffff() > [ 305.227097] raw: 0017ffffc0000840 ffff8881000428c0 ffffea0005b33500 dead000000000002 > [ 305.227100] raw: 0000000000000000 0000000000200020 00000001ffffffff 0000000000000000 > [ 305.227102] page dumped because: kasan: bad access detected > > [ 305.227106] Memory state around the buggy address: > [ 305.227109] ffff8881440a8e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > [ 305.227112] ffff8881440a8e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 305.227114] >ffff8881440a8f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb > [ 305.227117] ^ > [ 305.227120] ffff8881440a8f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > [ 305.227122] ffff8881440a9000: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc > [ 305.227125] ================================================================== > > Cc: <stable@xxxxxxxxxxxxxxx> # v6.7 only > Reported-by: Karol Herbst <kherbst@xxxxxxxxxx> > Closes: https://gist.githubusercontent.com/karolherbst/a20eb0f937a06ed6aabe2ac2ca3d11b5/raw/9cd8b1dc5894872d0eeebbee3dd0fdd28bb576bc/gistfile1.txt > Fixes: b88baab82871 ("drm/nouveau: implement new VM_BIND uAPI") You say 6.7 only, but this commit is in 6.6, so why not 6.6 also? thanks, greg k-h
