Re: Xorg indefinitely hangs in kernelspace

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On 05.09.19 15:34, Jaak Ristioja wrote:
> On 05.09.19 10:14, Gerd Hoffmann wrote:
>> On Tue, Aug 06, 2019 at 09:00:10PM +0300, Jaak Ristioja wrote:
>>> Hello!
>>>
>>> I'm writing to report a crash in the QXL / DRM code in the Linux kernel.
>>> I originally filed the issue on LaunchPad and more details can be found
>>> there, although I doubt whether these details are useful.
>>
>> Any change with kernel 5.3-rc7 ?
> 
> Didn't try. Did you change something? I could try, but I've done so
> before and every time this bug manifests itself with MAJOR.MINOR-rc# I
> get asked to try version MAJOR.(MINOR+1)-rc# so I guess I could as well
> give up?
> 
> Alright, I'll install 5.3-rc7, but once more it might take some time for
> this bug to expose itself.

Just got the issue with 5.3.0-050300rc7-generic:

[124212.547403] INFO: task Xorg:797 blocked for more than 120 seconds.
[124212.548639]       Not tainted 5.3.0-050300rc7-generic #201909021831
[124212.549839] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[124212.547403] INFO: task Xorg:797 blocked for more than 120 seconds.
[124212.548639]       Not tainted 5.3.0-050300rc7-generic #201909021831
[124212.549839] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[124212.551329] Xorg            D    0   797    773 0x00404004
[124212.551331] Call Trace:
[124212.551336]  __schedule+0x2b9/0x6c0
[124212.551337]  schedule+0x42/0xb0
[124212.551338]  schedule_preempt_disabled+0xe/0x10
[124212.551340]  __ww_mutex_lock.isra.0+0x261/0x7f0
[124212.551345]  ? ttm_bo_init+0x6b/0x100 [ttm]
[124212.551346]  __ww_mutex_lock_slowpath+0x16/0x20
[124212.551347]  ww_mutex_lock+0x38/0x90
[124212.551352]  ttm_eu_reserve_buffers+0x1cc/0x2f0 [ttm]
[124212.551371]  qxl_release_reserve_list+0x6d/0x150 [qxl]
[124212.551373]  ? qxl_bo_pin+0xf4/0x190 [qxl]
[124212.551375]  qxl_cursor_atomic_update+0x1ab/0x2e0 [qxl]
[124212.551376]  ? qxl_bo_pin+0xf4/0x190 [qxl]
[124212.551384]  drm_atomic_helper_commit_planes+0xd5/0x220 [drm_kms_helper]
[124212.551388]  drm_atomic_helper_commit_tail+0x2c/0x70 [drm_kms_helper]
[124212.551392]  commit_tail+0x68/0x70 [drm_kms_helper]
[124212.551395]  drm_atomic_helper_commit+0x118/0x120 [drm_kms_helper]
[124212.551407]  drm_atomic_commit+0x4a/0x50 [drm]
[124212.551411]  drm_atomic_helper_update_plane+0xea/0x100 [drm_kms_helper]
[124212.551418]  __setplane_atomic+0xcb/0x110 [drm]
[124212.551428]  drm_mode_cursor_universal+0x140/0x260 [drm]
[124212.551435]  drm_mode_cursor_common+0xcc/0x220 [drm]
[124212.551441]  ? drm_mode_cursor_ioctl+0x60/0x60 [drm]
[124212.551447]  drm_mode_cursor2_ioctl+0xe/0x10 [drm]
[124212.551452]  drm_ioctl_kernel+0xae/0xf0 [drm]
[124212.551458]  drm_ioctl+0x234/0x3d0 [drm]
[124212.551464]  ? drm_mode_cursor_ioctl+0x60/0x60 [drm]
[124212.551466]  ? timerqueue_add+0x5f/0xa0
[124212.551469]  ? enqueue_hrtimer+0x3d/0x90
[124212.551471]  do_vfs_ioctl+0x407/0x670
[124212.551473]  ? fput+0x13/0x20
[124212.551475]  ? __sys_recvmsg+0x88/0xa0
[124212.551476]  ksys_ioctl+0x67/0x90
[124212.551477]  __x64_sys_ioctl+0x1a/0x20
[124212.551479]  do_syscall_64+0x5a/0x130
[124212.551480]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[124212.551481] RIP: 0033:0x7f07c79ee417
[124212.551485] Code: Bad RIP value.
[124212.551485] RSP: 002b:00007ffc6b1de1a8 EFLAGS: 00003246 ORIG_RAX:
0000000000000010
[124212.551486] RAX: ffffffffffffffda RBX: 00005612f109a610 RCX:
00007f07c79ee417
[124212.551487] RDX: 00007ffc6b1de1e0 RSI: 00000000c02464bb RDI:
000000000000000e
[124212.551487] RBP: 00007ffc6b1de1e0 R08: 0000000000000040 R09:
0000000000000004
[124212.551488] R10: 000000000000003f R11: 0000000000003246 R12:
00000000c02464bb
[124212.551488] R13: 000000000000000e R14: 0000000000000000 R15:
00005612f10981d0
[124333.376328] INFO: task Xorg:797 blocked for more than 241 seconds.
[124333.377474]       Not tainted 5.3.0-050300rc7-generic #201909021831
[124333.378609] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[124333.376328] INFO: task Xorg:797 blocked for more than 241 seconds.
[124333.377474]       Not tainted 5.3.0-050300rc7-generic #201909021831
[124333.378609] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[124333.380060] Xorg            D    0   797    773 0x00404004
[124333.380062] Call Trace:
[124333.380067]  __schedule+0x2b9/0x6c0
[124333.380068]  schedule+0x42/0xb0
[124333.380069]  schedule_preempt_disabled+0xe/0x10
[124333.380070]  __ww_mutex_lock.isra.0+0x261/0x7f0
[124333.380076]  ? ttm_bo_init+0x6b/0x100 [ttm]
[124333.380077]  __ww_mutex_lock_slowpath+0x16/0x20
[124333.380077]  ww_mutex_lock+0x38/0x90
[124333.380080]  ttm_eu_reserve_buffers+0x1cc/0x2f0 [ttm]
[124333.380083]  qxl_release_reserve_list+0x6d/0x150 [qxl]
[124333.380085]  ? qxl_bo_pin+0xf4/0x190 [qxl]
[124333.380087]  qxl_cursor_atomic_update+0x1ab/0x2e0 [qxl]
[124333.380088]  ? qxl_bo_pin+0xf4/0x190 [qxl]
[124333.380096]  drm_atomic_helper_commit_planes+0xd5/0x220 [drm_kms_helper]
[124333.380101]  drm_atomic_helper_commit_tail+0x2c/0x70 [drm_kms_helper]
[124333.380105]  commit_tail+0x68/0x70 [drm_kms_helper]
[124333.380109]  drm_atomic_helper_commit+0x118/0x120 [drm_kms_helper]
[124333.380128]  drm_atomic_commit+0x4a/0x50 [drm]
[124333.380132]  drm_atomic_helper_update_plane+0xea/0x100 [drm_kms_helper]
[124333.380140]  __setplane_atomic+0xcb/0x110 [drm]
[124333.380147]  drm_mode_cursor_universal+0x140/0x260 [drm]
[124333.380153]  drm_mode_cursor_common+0xcc/0x220 [drm]
[124333.380160]  ? drm_mode_cursor_ioctl+0x60/0x60 [drm]
[124333.380166]  drm_mode_cursor2_ioctl+0xe/0x10 [drm]
[124333.380171]  drm_ioctl_kernel+0xae/0xf0 [drm]
[124333.380176]  drm_ioctl+0x234/0x3d0 [drm]
[124333.380182]  ? drm_mode_cursor_ioctl+0x60/0x60 [drm]
[124333.380184]  ? timerqueue_add+0x5f/0xa0
[124333.380186]  ? enqueue_hrtimer+0x3d/0x90
[124333.380188]  do_vfs_ioctl+0x407/0x670
[124333.380190]  ? fput+0x13/0x20
[124333.380192]  ? __sys_recvmsg+0x88/0xa0
[124333.380193]  ksys_ioctl+0x67/0x90
[124333.380194]  __x64_sys_ioctl+0x1a/0x20
[124333.380195]  do_syscall_64+0x5a/0x130
[124333.380197]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[124333.380198] RIP: 0033:0x7f07c79ee417
[124333.380202] Code: Bad RIP value.
[124333.380203] RSP: 002b:00007ffc6b1de1a8 EFLAGS: 00003246 ORIG_RAX:
0000000000000010
[124333.380204] RAX: ffffffffffffffda RBX: 00005612f109a610 RCX:
00007f07c79ee417
[124333.380204] RDX: 00007ffc6b1de1e0 RSI: 00000000c02464bb RDI:
000000000000000e
[124333.380205] RBP: 00007ffc6b1de1e0 R08: 0000000000000040 R09:
0000000000000004
[124333.380205] R10: 000000000000003f R11: 0000000000003246 R12:
00000000c02464bb
[124333.380206] R13: 000000000000000e R14: 0000000000000000 R15:
00005612f10981d0


Best regards,
J
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