Re: BUG: KASAN: slab-use-after-free in drm_sched_get_cleanup_job+0x47b/0x5c0 [gpu_sched]

[Mikhail Gavrilov]

On Tue, Mar 21, 2023 at 11:47 PM Christian König
<ckoenig.leichtzumerken@xxxxxxxxx> wrote:
>
> Hi Mikhail,
>
> That looks like a reference counting issue to me.
>
> I'm going to take a look, but we have already fixed one of those recently.
>
> Probably best that you try this on drm-fixes, just to double check that
> this isn't the same issue.
>

Hi Christian,
you meant this branch?
$ git clone -b drm-fixes git://anongit.freedesktop.org/drm/drm linux-drm

If yes I just checked and unfortunately see this issue unfixed there.

[ 1984.295833] ==================================================================
[ 1984.295876] BUG: KASAN: slab-use-after-free in
drm_sched_get_cleanup_job+0x47b/0x5c0 [gpu_sched]
[ 1984.295898] Read of size 8 at addr ffff88814cadc4c0 by task sdma1/764

[ 1984.295924] CPU: 12 PID: 764 Comm: sdma1 Tainted: G        W    L
  6.3.0-rc3-drm-fixes+ #1
[ 1984.295937] Hardware name: System manufacturer System Product
Name/ROG STRIX X570-I GAMING, BIOS 4601 02/02/2023
[ 1984.295951] Call Trace:
[ 1984.295963]  <TASK>
[ 1984.295975]  dump_stack_lvl+0x72/0xc0
[ 1984.295991]  print_report+0xcf/0x670
[ 1984.296007]  ? drm_sched_get_cleanup_job+0x47b/0x5c0 [gpu_sched]
[ 1984.296030]  ? drm_sched_get_cleanup_job+0x47b/0x5c0 [gpu_sched]
[ 1984.296047]  kasan_report+0xa4/0xe0
[ 1984.296118]  ? drm_sched_get_cleanup_job+0x47b/0x5c0 [gpu_sched]
[ 1984.296149]  drm_sched_get_cleanup_job+0x47b/0x5c0 [gpu_sched]
[ 1984.296175]  drm_sched_main+0x643/0x990 [gpu_sched]
[ 1984.296204]  ? __pfx_drm_sched_main+0x10/0x10 [gpu_sched]
[ 1984.296222]  ? __pfx_autoremove_wake_function+0x10/0x10
[ 1984.296290]  ? __kthread_parkme+0xc1/0x1f0
[ 1984.296304]  ? __pfx_drm_sched_main+0x10/0x10 [gpu_sched]
[ 1984.296321]  kthread+0x29e/0x340
[ 1984.296334]  ? __pfx_kthread+0x10/0x10
[ 1984.296501]  ret_from_fork+0x2c/0x50
[ 1984.296518]  </TASK>

[ 1984.296539] Allocated by task 12194:
[ 1984.296552]  kasan_save_stack+0x2f/0x50
[ 1984.296566]  kasan_set_track+0x21/0x30
[ 1984.296578]  __kasan_kmalloc+0x8b/0x90
[ 1984.296590]  amdgpu_driver_open_kms+0x10b/0x5a0 [amdgpu]
[ 1984.297051]  drm_file_alloc+0x46e/0x880
[ 1984.297064]  drm_open_helper+0x161/0x460
[ 1984.297076]  drm_open+0x1e7/0x5c0
[ 1984.297089]  drm_stub_open+0x24d/0x400
[ 1984.297107]  chrdev_open+0x215/0x620
[ 1984.297125]  do_dentry_open+0x5f1/0x1000
[ 1984.297146]  path_openat+0x1b3d/0x28a0
[ 1984.297164]  do_filp_open+0x1bd/0x400
[ 1984.297180]  do_sys_openat2+0x140/0x420
[ 1984.297197]  __x64_sys_openat+0x11f/0x1d0
[ 1984.297213]  do_syscall_64+0x5b/0x80
[ 1984.297231]  entry_SYSCALL_64_after_hwframe+0x72/0xdc

[ 1984.297266] Freed by task 12195:
[ 1984.297284]  kasan_save_stack+0x2f/0x50
[ 1984.297303]  kasan_set_track+0x21/0x30
[ 1984.297323]  kasan_save_free_info+0x2a/0x50
[ 1984.297343]  __kasan_slab_free+0x107/0x1a0
[ 1984.297361]  slab_free_freelist_hook+0x11e/0x1d0
[ 1984.297373]  __kmem_cache_free+0xbc/0x2e0
[ 1984.297385]  amdgpu_driver_postclose_kms+0x582/0x8d0 [amdgpu]
[ 1984.297821]  drm_file_free.part.0+0x638/0xb70
[ 1984.297834]  drm_release+0x1ea/0x470
[ 1984.297845]  __fput+0x213/0x9e0
[ 1984.297857]  task_work_run+0x11b/0x200
[ 1984.297869]  exit_to_user_mode_prepare+0x23a/0x260
[ 1984.297883]  syscall_exit_to_user_mode+0x16/0x50
[ 1984.297896]  do_syscall_64+0x67/0x80
[ 1984.297907]  entry_SYSCALL_64_after_hwframe+0x72/0xdc

[ 1984.298033] Last potentially related work creation:
[ 1984.298044]  kasan_save_stack+0x2f/0x50
[ 1984.298057]  __kasan_record_aux_stack+0x97/0xb0
[ 1984.298075]  __call_rcu_common.constprop.0+0xf8/0x1af0
[ 1984.298095]  amdgpu_bo_list_put+0x1a4/0x1f0 [amdgpu]
[ 1984.298557]  amdgpu_cs_parser_fini+0x293/0x5a0 [amdgpu]
[ 1984.299055]  amdgpu_cs_ioctl+0x4f2a/0x5630 [amdgpu]
[ 1984.299624]  drm_ioctl_kernel+0x1f8/0x3d0
[ 1984.299637]  drm_ioctl+0x4c1/0xaa0
[ 1984.299649]  amdgpu_drm_ioctl+0xce/0x1b0 [amdgpu]
[ 1984.300083]  __x64_sys_ioctl+0x12d/0x1a0
[ 1984.300097]  do_syscall_64+0x5b/0x80
[ 1984.300109]  entry_SYSCALL_64_after_hwframe+0x72/0xdc

[ 1984.300135] Second to last potentially related work creation:
[ 1984.300149]  kasan_save_stack+0x2f/0x50
[ 1984.300167]  __kasan_record_aux_stack+0x97/0xb0
[ 1984.300185]  __call_rcu_common.constprop.0+0xf8/0x1af0
[ 1984.300203]  amdgpu_bo_list_put+0x1a4/0x1f0 [amdgpu]
[ 1984.300692]  amdgpu_cs_parser_fini+0x293/0x5a0 [amdgpu]
[ 1984.301133]  amdgpu_cs_ioctl+0x4f2a/0x5630 [amdgpu]
[ 1984.301577]  drm_ioctl_kernel+0x1f8/0x3d0
[ 1984.301598]  drm_ioctl+0x4c1/0xaa0
[ 1984.301610]  amdgpu_drm_ioctl+0xce/0x1b0 [amdgpu]
[ 1984.302043]  __x64_sys_ioctl+0x12d/0x1a0
[ 1984.302056]  do_syscall_64+0x5b/0x80
[ 1984.302068]  entry_SYSCALL_64_after_hwframe+0x72/0xdc

[ 1984.302090] The buggy address belongs to the object at ffff88814cadc000
                which belongs to the cache kmalloc-4k of size 4096
[ 1984.302103] The buggy address is located 1216 bytes inside of
                freed 4096-byte region [ffff88814cadc000, ffff88814cadd000)

[ 1984.302129] The buggy address belongs to the physical page:
[ 1984.302141] page:00000000103c1864 refcount:1 mapcount:0
mapping:0000000000000000 index:0x0 pfn:0x14cad8
[ 1984.302155] head:00000000103c1864 order:3 entire_mapcount:0
nr_pages_mapped:0 pincount:0
[ 1984.302168] flags:
0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)
[ 1984.302184] raw: 0017ffffc0010200 ffff88810004d040 ffffea00311f0200
dead000000000002
[ 1984.302196] raw: 0000000000000000 0000000000040004 00000001ffffffff
0000000000000000
[ 1984.302208] page dumped because: kasan: bad access detected

[ 1984.302230] Memory state around the buggy address:
[ 1984.302241]  ffff88814cadc380: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[ 1984.302252]  ffff88814cadc400: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[ 1984.302263] >ffff88814cadc480: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[ 1984.302274]                                            ^
[ 1984.302285]  ffff88814cadc500: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[ 1984.302296]  ffff88814cadc580: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[ 1984.302307] ==================================================================
[ 1984.302339] Disabling lock debugging due to kernel taint

-- 
Best Regards,
Mike Gavrilov.

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