Hi,
Below issue was seen with drm-ci testing,
Pipeline: https://gitlab.freedesktop.org/vigneshraman/linux/-/jobs/65859386
Linux version: 6.12-rc2
Branch: drm-misc-next
DEBUG - Begin test testdisplay
[ 1229.996702] INFO: task testdisplay:2546 blocked for more than 122
seconds.
[ 1229.997303] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1229.997764] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1229.998816]
Showing all locks held in the system:
[ 1229.998824] 1 lock held by khungtaskd/29:
[ 1229.998830] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1229.998870] 1 lock held by dmesg/66:
[ 1229.998875] 3 locks held by kworker/1:0/495:
[ 1229.998881] 2 locks held by kms_concurrent/1623:
[ 1229.998886] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1229.998915] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1229.998937] 1 lock held by testdisplay/2546:
[ 1229.998943] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1229.998968] =============================================
[ 1352.876639] INFO: task testdisplay:2546 blocked for more than 245
seconds.
[ 1352.877238] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1352.877707] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1352.878582]
Showing all locks held in the system:
[ 1352.878587] 1 lock held by khungtaskd/29:
[ 1352.878591] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1352.878613] 1 lock held by dmesg/66:
[ 1352.878618] 4 locks held by kworker/1:0/495:
[ 1352.878622] 2 locks held by kms_concurrent/1623:
[ 1352.878626] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1352.878647] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1352.878665] 1 lock held by testdisplay/2546:
[ 1352.878669] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1352.878689] =============================================
[ 1475.756731] INFO: task testdisplay:2546 blocked for more than 368
seconds.
[ 1475.757311] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1475.757863] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1475.758884]
Showing all locks held in the system:
[ 1475.758890] 1 lock held by khungtaskd/29:
[ 1475.758895] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1475.758921] 1 lock held by dmesg/66:
[ 1475.758927] 3 locks held by kworker/1:0/495:
[ 1475.758933] 2 locks held by kms_concurrent/1623:
[ 1475.758938] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1475.758963] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1475.758985] 1 lock held by testdisplay/2546:
[ 1475.758990] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1475.759016] =============================================
[ 1598.636617] INFO: task testdisplay:2546 blocked for more than 491
seconds.
[ 1598.637199] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1598.637638] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1598.638466]
Showing all locks held in the system:
[ 1598.638471] 1 lock held by khungtaskd/29:
[ 1598.638476] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1598.638498] 1 lock held by dmesg/66:
[ 1598.638502] 2 locks held by kworker/1:0/495:
[ 1598.638507] 2 locks held by kms_concurrent/1623:
[ 1598.638511] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1598.638531] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1598.638561] 1 lock held by testdisplay/2546:
[ 1598.638565] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1598.638586] =============================================
[ 1721.516713] INFO: task testdisplay:2546 blocked for more than 614
seconds.
[ 1721.517446] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1721.518039] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1721.519117]
Showing all locks held in the system:
[ 1721.519124] 1 lock held by khungtaskd/29:
[ 1721.519130] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1721.519160] 1 lock held by dmesg/66:
[ 1721.519167] 3 locks held by kworker/1:0/495:
[ 1721.519173] 2 locks held by kms_concurrent/1623:
[ 1721.519179] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1721.519207] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1721.519231] 1 lock held by testdisplay/2546:
[ 1721.519237] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1721.519267] =============================================
[ 1844.396721] INFO: task testdisplay:2546 blocked for more than 737
seconds.
[ 1844.397422] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1844.397950] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1844.398996]
Showing all locks held in the system:
[ 1844.399004] 1 lock held by khungtaskd/29:
[ 1844.399010] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1844.399041] 1 lock held by dmesg/66:
[ 1844.399048] 4 locks held by kworker/1:0/495:
[ 1844.399053] 2 locks held by kms_concurrent/1623:
[ 1844.399058] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1844.399084] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1844.399108] 1 lock held by testdisplay/2546:
[ 1844.399113] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1844.399141] =============================================
[ 1967.276701] INFO: task testdisplay:2546 blocked for more than 860
seconds.
[ 1967.277282] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 1967.277735] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 1967.278559]
Showing all locks held in the system:
[ 1967.278576] 1 lock held by khungtaskd/29:
[ 1967.278580] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 1967.278602] 1 lock held by dmesg/66:
[ 1967.278606] 2 locks held by kworker/1:0/495:
[ 1967.278610] 2 locks held by kms_concurrent/1623:
[ 1967.278614] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 1967.278633] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 1967.278650] 1 lock held by testdisplay/2546:
[ 1967.278654] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 1967.278674] =============================================
[ 2090.156642] INFO: task testdisplay:2546 blocked for more than 983
seconds.
[ 2090.157632] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 2090.158241] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 2090.159102]
Showing all locks held in the system:
[ 2090.159107] 1 lock held by khungtaskd/29:
[ 2090.159111] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 2090.159133] 1 lock held by dmesg/66:
[ 2090.159137] 3 locks held by kworker/1:0/495:
[ 2090.159141] 2 locks held by kms_concurrent/1623:
[ 2090.159145] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 2090.159165] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 2090.159182] 1 lock held by testdisplay/2546:
[ 2090.159189] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 2090.159209] =============================================
[ 2213.036658] INFO: task testdisplay:2546 blocked for more than 1105
seconds.
[ 2213.037250] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 2213.037744] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 2213.038593]
Showing all locks held in the system:
[ 2213.038598] 1 lock held by khungtaskd/29:
[ 2213.038602] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 2213.038624] 1 lock held by dmesg/66:
[ 2213.038629] 3 locks held by kworker/1:0/495:
[ 2213.038633] 2 locks held by kms_concurrent/1623:
[ 2213.038637] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 2213.038657] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 2213.038674] 1 lock held by testdisplay/2546:
[ 2213.038678] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 2213.038699] =============================================
[ 2335.916691] INFO: task testdisplay:2546 blocked for more than 1228
seconds.
[ 2335.917751] Not tainted 6.12.0-rc2-g13339fa4b45f #1
[ 2335.918166] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 2335.919035]
Showing all locks held in the system:
[ 2335.919040] 1 lock held by khungtaskd/29:
[ 2335.919044] #0: ffffffff93d5b2c0 (rcu_read_lock){....}-{1:2}, at:
debug_show_all_locks+0x36/0x1c0
[ 2335.919066] 1 lock held by dmesg/66:
[ 2335.919071] 3 locks held by kworker/1:0/495:
[ 2335.919075] 2 locks held by kms_concurrent/1623:
[ 2335.919079] #0: ffffa9fe00b4fd20
(crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_mode_atomic_ioctl+0x11b/0xc90
[ 2335.919099] #1: ffff8cc9c140caf0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: modeset_lock+0x5c/0x1c0
[ 2335.919116] 1 lock held by testdisplay/2546:
[ 2335.919120] #0: ffff8cc9c0a1f0b0 (crtc_ww_class_mutex){+.+.}-{3:3},
at: drm_modeset_lock+0x1e/0x30
[ 2335.919140] =============================================
Regards,
Vignesh
