[BUG] KCSAN: data-race in drm_sched_entity_is_ready [gpu_sched] / drm_sched_entity_push_job [gpu_sched]

[Mirsad Todorovac]

Hi,

This is your friendly bug reporter.

The environment is vanilla torvalds tree kernel on Ubuntu 22.04 LTS and a Ryzen 7950X box.

Please find attached the complete dmesg output from the ring buffer and lshw output.

NOTE: The kernel reports tainted kernel, but to my knowledge there are no proprietary (G) modules,
      but this taint is turned on by the previous bugs.

dmesg excerpt:

[ 8791.864576] ==================================================================
[ 8791.864648] BUG: KCSAN: data-race in drm_sched_entity_is_ready [gpu_sched] / drm_sched_entity_push_job [gpu_sched]

[ 8791.864776] write (marked) to 0xffff9b74491b7c40 of 8 bytes by task 3807 on cpu 18:
[ 8791.864788]  drm_sched_entity_push_job+0xf4/0x2a0 [gpu_sched]
[ 8791.864852]  amdgpu_cs_ioctl+0x3888/0x3de0 [amdgpu]
[ 8791.868731]  drm_ioctl_kernel+0x127/0x210 [drm]
[ 8791.869222]  drm_ioctl+0x38f/0x6f0 [drm]
[ 8791.869711]  amdgpu_drm_ioctl+0x7e/0xe0 [amdgpu]
[ 8791.873660]  __x64_sys_ioctl+0xd2/0x120
[ 8791.873676]  do_syscall_64+0x58/0x90
[ 8791.873688]  entry_SYSCALL_64_after_hwframe+0x73/0xdd

[ 8791.873710] read to 0xffff9b74491b7c40 of 8 bytes by task 1119 on cpu 27:
[ 8791.873722]  drm_sched_entity_is_ready+0x16/0x50 [gpu_sched]
[ 8791.873786]  drm_sched_select_entity+0x1c7/0x220 [gpu_sched]
[ 8791.873849]  drm_sched_main+0xd2/0x500 [gpu_sched]
[ 8791.873912]  kthread+0x18b/0x1d0
[ 8791.873924]  ret_from_fork+0x43/0x70
[ 8791.873939]  ret_from_fork_asm+0x1b/0x30

[ 8791.873955] value changed: 0x0000000000000000 -> 0xffff9b750ebcfc00

[ 8791.873971] Reported by Kernel Concurrency Sanitizer on:
[ 8791.873980] CPU: 27 PID: 1119 Comm: gfx_0.0.0 Tainted: G             L     6.5.0-rc6-net-cfg-kcsan-00038-g16931859a650 #35
[ 8791.873994] Hardware name: ASRock X670E PG Lightning/X670E PG Lightning, BIOS 1.21 04/26/2023
[ 8791.874002] ==================================================================

Best regards,
Mirsad Todorovac

Attachment: dmesg-3.log.xz
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Attachment: lshw.txt.xz
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