Kernel WARNING at

[Zzy Wysm]

I found the following warning in my log this evening.  I don’t know if or how it can be reproduced.

Linux 5.10.77 amd64.  Kernel config attached.  (The kernel taint is merely because of the struct randomization plugin.)

zzy

..

kernel: ------------[ cut here ]------------
kernel: refcount_t: addition on 0; use-after-free.
kernel: WARNING: CPU: 3 PID: 957 at lib/refcount.c:25 refcount_warn_saturate+0x68/0xf0
kernel: CPU: 3 PID: 957 Comm: Xorg Tainted: G        W       T 5.10.77 #1
kernel: Hardware name: Supermicro Super Server/H11SSL-NC, BIOS 2.1 02/21/2020
kernel: RIP: 0010:refcount_warn_saturate+0x68/0xf0
kernel: Code: 05 2c 9f f5 01 01 e8 83 82 9e 00 0f 0b c3 80 3d 1c 9f f5 01 00 75 d3 48 c7 c7 f0 2e 1d 96 c6 05 0c 9f f5 01 01 e8 64 82 9e 00 <0f> 0b c3 80 3d ff 9e f5 01 00 75 d3 48 c7 c7 f0 2e 1d 96 c6 05 0c 9f f5 01 01 e8 64 82 9e 00 <0f> 0b c3 80 3d ff 9e f5 01 00 75 b4 48 c7 c7 c8 2e 1d 96 c6 05 ef
kernel: RSP: 0018:ffffb4f201cc3c00 EFLAGS: 00010286
kernel: RAX: 0000000000000000 RBX: ffff8a0c00ede458 RCX: 0000000000000027
kernel: RDX: 0000000000000027 RSI: 00000000fffeffff RDI: ffff8a2ace192e88
kernel: RBP: ffffb4f201cc3d38 R08: ffff8a2ace192e80 R09: ffffb4f201cc3a28
kernel: R10: 0000000000000001 R11: 0000000000000001 R12: ffff8a0c911e5000
kernel: R13: ffff8a0cba1fc580 R14: ffffb4f201cc3cc8 R15: ffff8a0c1a440000
kernel: FS:  0000000000000000(0000) GS:ffff8a2ace180000(0000) knlGS:0000000000000000
kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernel: CR2: 0000736ef80ab660 CR3: 00000011da80c000 CR4: 0000000000350ee0
kernel: Call Trace:
kernel:  dma_resv_add_shared_fence+0x122/0x180
kernel:  amdgpu_gem_object_close+0x1c3/0x250
kernel:  drm_gem_object_release_handle+0x2b/0x90
kernel:  ? drm_gem_object_handle_put_unlocked+0xc0/0xc0
kernel:  idr_for_each+0x70/0xe0
kernel:  drm_gem_release+0x17/0x20
kernel:  drm_file_free.part.0+0x273/0x280
kernel:  drm_release+0x60/0xe0
kernel:  __fput+0x96/0x240
kernel:  task_work_run+0x5a/0x90
kernel:  do_exit+0x34e/0xaf0
kernel:  do_group_exit+0x34/0xb0
kernel:  __x64_sys_exit_group+0xf/0x10
kernel:  do_syscall_64+0x33/0x40
kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
kernel: RIP: 0033:0x736f1c33a699
kernel: Code: Unable to access opcode bytes at RIP 0x736f1c33a66f.
kernel: RSP: 002b:00007ffce40b21e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
kernel: RAX: ffffffffffffffda RBX: 0000736f1c42f610 RCX: 0000736f1c33a699
kernel: RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000
kernel: RBP: 0000000000000000 R08: fffffffffffffc80 R09: 0000000000000000
kernel: R10: 0000736f1cdbaa40 R11: 0000000000000246 R12: 0000736f1c42f610
kernel: R13: 0000000000000b14 R14: 0000736f1c42fae8 R15: 0000000000000000
kernel: ---[ end trace 52a8b244b766437f ]—

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