[Bug 199425] BUG: KASAN: use-after-free in drm_atomic_helper_wait_for_flip_done+0x247/0x260

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199425

--- Comment #7 from Johannes Hirte (johannes.hirte@datenkhaos.de) ---
dmesg output with drm.debug=0x6 and without your patch:

May 25 13:40:54 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1a010000 
May 25 13:40:54 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:54 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1de10000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel:
==================================================================
May 25 13:40:55 probook kernel: BUG: KASAN: use-after-free in
drm_atomic_helper_wait_for_flip_done+0x247/0x260
May 25 13:40:55 probook kernel: Read of size 8 at addr ffff8801aa0a0688 by task
kworker/u8:10/7828
May 25 13:40:55 probook kernel: 
May 25 13:40:55 probook kernel: CPU: 2 PID: 7828 Comm: kworker/u8:10 Not
tainted 4.17.0-rc6-00152-ga048a07d7f45 #606
May 25 13:40:55 probook kernel: Hardware name: HP HP ProBook 645 G2/80FE, BIOS
N77 Ver. 01.15 03/26/2018
May 25 13:40:55 probook kernel: Workqueue: events_unbound commit_work
May 25 13:40:55 probook kernel: Call Trace:
May 25 13:40:55 probook kernel:  dump_stack+0x5b/0x8b
May 25 13:40:55 probook kernel:  ?
drm_atomic_helper_wait_for_flip_done+0x247/0x260
May 25 13:40:55 probook kernel:  print_address_description+0x65/0x270
May 25 13:40:55 probook kernel:  ?
drm_atomic_helper_wait_for_flip_done+0x247/0x260
May 25 13:40:55 probook kernel:  kasan_report+0x232/0x350
May 25 13:40:55 probook kernel: 
drm_atomic_helper_wait_for_flip_done+0x247/0x260
May 25 13:40:55 probook kernel:  amdgpu_dm_atomic_commit_tail+0x1b19/0x4010
May 25 13:40:55 probook kernel:  ? _raw_spin_unlock_irq+0x35/0x50
May 25 13:40:55 probook kernel:  ? wait_for_completion_timeout+0x215/0x2b0
May 25 13:40:55 probook kernel:  ? dm_update_crtcs_state+0xde0/0xde0
May 25 13:40:55 probook kernel:  ? _raw_spin_unlock_irq+0x35/0x50
May 25 13:40:55 probook kernel:  ? finish_task_switch+0x12f/0x770
May 25 13:40:55 probook kernel:  ?
drm_atomic_helper_wait_for_dependencies+0x3de/0x7d0
May 25 13:40:55 probook kernel:  commit_tail+0x95/0xf0
May 25 13:40:55 probook kernel:  process_one_work+0x7c8/0x1330
May 25 13:40:55 probook kernel:  ? _raw_spin_lock_irq+0x1c/0x40
May 25 13:40:55 probook kernel:  worker_thread+0xc9/0xef0
May 25 13:40:55 probook kernel:  ? process_one_work+0x1330/0x1330
May 25 13:40:55 probook kernel:  kthread+0x2d6/0x390
May 25 13:40:55 probook kernel:  ? kthread_create_worker+0xd0/0xd0
May 25 13:40:55 probook kernel:  ret_from_fork+0x22/0x40
May 25 13:40:55 probook kernel:
May 25 13:40:55 probook kernel: Allocated by task 614:
May 25 13:40:55 probook kernel:  kasan_kmalloc+0xa0/0xd0
May 25 13:40:55 probook kernel:  kmem_cache_alloc_trace+0xf3/0x1f0
May 25 13:40:55 probook kernel:  dm_crtc_duplicate_state+0x73/0x130
May 25 13:40:55 probook kernel:  drm_atomic_get_crtc_state+0x142/0x400
May 25 13:40:55 probook kernel:  page_flip_common+0x52/0x220
May 25 13:40:55 probook kernel:  drm_atomic_helper_page_flip+0xa1/0x100
May 25 13:40:55 probook kernel:  drm_mode_page_flip_ioctl+0xbe3/0xff0
May 25 13:40:55 probook kernel:  drm_ioctl_kernel+0x13d/0x1d0
May 25 13:40:55 probook kernel:  drm_ioctl+0x63d/0x920
May 25 13:40:55 probook kernel:  amdgpu_drm_ioctl+0xc7/0x1a0
May 25 13:40:55 probook kernel:  do_vfs_ioctl+0x173/0xde0
May 25 13:40:55 probook kernel:  ksys_ioctl+0x6b/0x80
May 25 13:40:55 probook kernel:  __x64_sys_ioctl+0x6a/0xb0
May 25 13:40:55 probook kernel:  do_syscall_64+0x95/0x2f0
May 25 13:40:55 probook kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
May 25 13:40:55 probook kernel:
May 25 13:40:55 probook kernel: Freed by task 626:
May 25 13:40:55 probook kernel:  __kasan_slab_free+0x130/0x180
May 25 13:40:55 probook kernel:  kfree+0x8b/0x1c0
May 25 13:40:55 probook kernel:  drm_atomic_state_default_clear+0x30f/0xbd0
May 25 13:40:55 probook kernel:  __drm_atomic_state_free+0x30/0xc0
May 25 13:40:55 probook kernel:  drm_atomic_helper_update_plane+0xb6/0x350
May 25 13:40:55 probook kernel:  __setplane_internal+0x48c/0x7f0
May 25 13:40:55 probook kernel:  drm_mode_cursor_universal+0x2e7/0x970
May 25 13:40:55 probook kernel:  drm_mode_cursor_common+0x493/0x860
May 25 13:40:55 probook kernel:  drm_mode_cursor_ioctl+0x7a/0xa0
May 25 13:40:55 probook kernel:  drm_ioctl_kernel+0x13d/0x1d0
May 25 13:40:55 probook kernel:  drm_ioctl+0x63d/0x920
May 25 13:40:55 probook kernel:  amdgpu_drm_ioctl+0xc7/0x1a0
May 25 13:40:55 probook kernel:  do_vfs_ioctl+0x173/0xde0
May 25 13:40:55 probook kernel:  ksys_ioctl+0x6b/0x80
May 25 13:40:55 probook kernel:  __x64_sys_ioctl+0x6a/0xb0
May 25 13:40:55 probook kernel:  do_syscall_64+0x95/0x2f0
May 25 13:40:55 probook kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
May 25 13:40:55 probook kernel: 
May 25 13:40:55 probook kernel: The buggy address belongs to the object at
ffff8801aa0a0480
 which belongs to the cache kmalloc-1024 of size 1024
May 25 13:40:55 probook kernel: The buggy address is located 520 bytes inside
of
 1024-byte region [ffff8801aa0a0480, ffff8801aa0a0880)
May 25 13:40:55 probook kernel: The buggy address belongs to the page:
May 25 13:40:55 probook kernel: page:ffffea0006a82800 count:1 mapcount:0
mapping:0000000000000000 index:0xffff8801aa0a7080 compound_mapcount: 0
May 25 13:40:55 probook kernel: flags: 0x2000000000008100(slab|head)
May 25 13:40:55 probook kernel: raw: 2000000000008100 0000000000000000
ffff8801aa0a7080 00000001801c001a
May 25 13:40:55 probook kernel: raw: 0000000000000000 0000000100000001
ffff8803f3402c40 0000000000000000
May 25 13:40:55 probook kernel: page dumped because: kasan: bad access detected
May 25 13:40:55 probook kernel: 
May 25 13:40:55 probook kernel: Memory state around the buggy address:
May 25 13:40:55 probook kernel:  ffff8801aa0a0580: fb fb fb fb fb fb fb fb fb
fb fb fb fb fb fb fb
May 25 13:40:55 probook kernel:  ffff8801aa0a0600: fb fb fb fb fb fb fb fb fb
fb fb fb fb fb fb fb
May 25 13:40:55 probook kernel: >ffff8801aa0a0680: fb fb fb fb fb fb fb fb fb
fb fb fb fb fb fb fb
May 25 13:40:55 probook kernel:                       ^
May 25 13:40:55 probook kernel:  ffff8801aa0a0700: fb fb fb fb fb fb fb fb fb
fb fb fb fb fb fb fb
May 25 13:40:55 probook kernel:  ffff8801aa0a0780: fb fb fb fb fb fb fb fb fb
fb fb fb fb fb fb fb
May 25 13:40:55 probook kernel:
==================================================================
May 25 13:40:55 probook kernel: Disabling lock debugging due to kernel taint
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1a010000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1de10000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1a010000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1de10000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1a010000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1de10000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] amdgpu_dm_do_flip
Flipping to hi: 0xf4, low: 0x1a010000 
May 25 13:40:55 probook kernel: [drm:dm_pflip_high_irq] dm_pflip_high_irq -
crtc :0[00000000bae227b0], pflip_stat:AMDGPU_FLIP_NONE
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail]
handle_cursor_update: crtc_id=0 with size 128 to 128
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_atomic_commit_tail] amdgpu_crtc
id:0 crtc_state_flags: enable:1, active:1, planes_changed:1,
mode_changed:0,active_changed:0,connectors_changed:0
May 25 13:40:55 probook kernel: [drm:amdgpu_dm_do_flip] crtc:0,
pflip_stat:AMDGPU_FLIP_SUBMITTED


I'm trying your patch if it makes any difference.

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