[Bug] program become uninterrupt(STAT D) when run 64 graphics program in sub window

[Bug] program become uninterrupt(STAT D) when run 64 graphics program in sub window

[wormwang]

Linux kernel 5.0 , amd rx580 gpu card


1 or many graphics program become uninterrupted(STAT D) when run 64 
graphics program of sub-window concurrently.

We have to reboot machine to release the uninterrupted(STAT D) program.

We have such kernel log:


  kernel: RenderThread D 0 393786 337242 0x00400008
  kernel: Call trace:
  kernel: __switch_to+0xbc/0x1c0
  kernel: __schedule+0x3fc/0xca0
  kernel: 0xffff801fd32a0000
  kernel: TP-IoBound-2 D 0 400200 337242 0x0040002d
  kernel: Call trace:
  kernel: __switch_to+0xbc/0x1c0
  kernel: __schedule+0x3fc/0xca0
  kernel: schedule+0x40/0x98
  kernel: schedule_preempt_disabled+0x28/0x40
  kernel: __mutex_lock+0x264/0x850
  kernel: mutex_lock_nested+0x3c/0x50
  kernel: drm_release+0x3c/0xd8 [drm]
  kernel: __fput+0xc0/0x230
  kernel: ____fput+0x20/0x30
  kernel: task_work_run+0xa0/0xd0
  kernel: do_exit+0x364/0xb50
  kernel: do_group_exit+0x40/0xa8
  kernel: get_signal+0xf0/0x970
  kernel: do_notify_resume+0x2ac/0x390
  kernel: work_pending+0x8/0x14
  kernel: BootAnimation D 0 400905 393737 0x00000000
  kernel: Call trace:
  kernel: __switch_to+0xbc/0x1c0
  kernel: __schedule+0x3fc/0xca0
  kernel: schedule+0x40/0x98
  kernel: schedule_preempt_disabled+0x28/0x40
  kernel: __mutex_lock+0x264/0x850
  kernel: mutex_lock_nested+0x3c/0x50
  kernel: drm_stub_open+0x44/0x118 [drm]
  kernel: chrdev_open+0xac/0x1c0
  kernel: do_dentry_open+0x1c4/0x370
  kernel: vfs_open+0x38/0x48


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