Hello,
kernel test robot noticed "WARNING:possible_recursive_locking_detected" on:
commit: 432c7653afa4afe08e59d608db7cbbc321c52149 ("[PATCH 1/2] drm: Introduce a
new connector status")
url:
https://github.com/intel-lab-lkp/linux/commits/Marius-Vlad/drm-Introduce-a-new-connector-status/20250923-163922
base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
patch link:
https://lore.kernel.org/all/[email protected]/
patch subject: [PATCH 1/2] drm: Introduce a new connector status
in testcase: boot
config: x86_64-randconfig-074-20250924
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
(please refer to attached dmesg/kmsg for entire log/backtrace)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-lkp/[email protected]
[ 19.416092][ T1] WARNING: possible recursive locking detected
[ 19.416406][ T1] 6.17.0-rc2-00290-g432c7653afa4 #1 Not tainted
[ 19.416406][ T1] --------------------------------------------
[ 19.416406][ T1] swapper/0/1 is trying to acquire lock:
[ 19.416406][ T1] ffff88813b9c84d0 (&dev->mode_config.mutex){+.+.}-{4:4}, at:
drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 19.416406][ T1]
[ 19.416406][ T1] but task is already holding lock:
[ 19.416406][ T1] ffff88813b9c84d0 (&dev->mode_config.mutex){+.+.}-{4:4}, at:
drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869)
[ 19.416406][ T1]
[ 19.416406][ T1] other info that might help us debug this:
[ 19.416406][ T1] Possible unsafe locking scenario:
[ 19.416406][ T1]
[ 19.416406][ T1] CPU0
[ 19.416406][ T1] ----
[ 19.416406][ T1] lock(&dev->mode_config.mutex);
[ 19.416406][ T1]
[ 19.416406][ T1] *** DEADLOCK ***
[ 19.416406][ T1]
[ 19.416406][ T1] May be due to missing lock nesting notation
[ 19.416406][ T1]
[ 19.416406][ T1] 6 locks held by swapper/0/1:
[ 19.416406][ T1] #0: ffff88813b9c8320 (&dev->clientlist_mutex){+.+.}-{4:4},
at: drm_client_register (include/linux/list.h:169
drivers/gpu/drm/drm_client.c:128)
[ 19.416406][ T1] #1: ffff888108a882a0 (&helper->lock){+.+.}-{4:4}, at:
drm_fb_helper_initial_config (drivers/gpu/drm/drm_fb_helper.c:1917)
[ 19.416406][ T1] #2: ffff888108a88098 (&client->modeset_mutex){+.+.}-{4:4},
at: drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:867)
[ 19.416406][ T1] #3: ffff88813b9c84d0 (&dev->mode_config.mutex){+.+.}-{4:4},
at: drm_client_modeset_probe (drivers/gpu/drm/drm_client_modeset.c:869)
[ 19.416406][ T1] #4: ffffc9000001fa78 (crtc_ww_class_acquire){+.+.}-{0:0}, at:
drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:572)
[ 19.416406][ T1] #5: ffffc9000001faa8 (crtc_ww_class_mutex){+.+.}-{4:4}, at:
drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:572)
[ 19.416406][ T1]
[ 19.416406][ T1] stack backtrace:
[ 19.416406][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted
6.17.0-rc2-00290-g432c7653afa4 #1 PREEMPT(none)
[ 19.416406][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 19.416406][ T1] Call Trace:
[ 19.416406][ T1] <TASK>
[ 19.416406][ T1] dump_stack_lvl (lib/dump_stack.c:122)
[ 19.416406][ T1] print_deadlock_bug.cold (kernel/locking/lockdep.c:3044)
[ 19.416406][ T1] validate_chain (kernel/locking/lockdep.c:3898)
[ 19.416406][ T1] __lock_acquire (kernel/locking/lockdep.c:5237 (discriminator
1))
[ 19.416406][ T1] lock_acquire (kernel/locking/lockdep.c:470
kernel/locking/lockdep.c:5870)
[ 19.416406][ T1] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 19.416406][ T1] ? sched_show_task (kernel/sched/core.c:8912)
[ 19.416406][ T1] ? look_up_lock_class (kernel/locking/lockdep.c:933
(discriminator 28))
[ 19.416406][ T1] __mutex_lock (arch/x86/include/asm/atomic.h:23
include/linux/atomic/atomic-arch-fallback.h:457 include/linux/jump_label.h:262
include/trace/events/lock.h:95 kernel/locking/mutex.c:600
kernel/locking/mutex.c:760)
[ 19.416406][ T1] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 19.416406][ T1] ? look_up_lock_class (kernel/locking/lockdep.c:933
(discriminator 28))
[ 19.416406][ T1] ? mutex_lock_io_nested (kernel/locking/mutex.c:759)
[ 19.416406][ T1] ? drm_print_bits (drivers/gpu/drm/drm_print.c:334)
[ 19.416406][ T1] ? ww_mutex_lock (kernel/locking/mutex.c:887)
[ 19.416406][ T1] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 19.416406][ T1] drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 19.416406][ T1] ? __drm_helper_update_and_validate
(drivers/gpu/drm/drm_probe_helper.c:561)
[ 19.416406][ T1] ? __kmalloc_noprof (include/trace/events/kmem.h:54
(discriminator 2) mm/slub.c:4366 (discriminator 2) mm/slub.c:4377
(discriminator 2))
[ 19.416406][ T1] drm_client_modeset_probe
(drivers/gpu/drm/drm_client_modeset.c:869 (discriminator 1))
[ 19.416406][ T1] ? drm_client_firmware_config
(drivers/gpu/drm/drm_client_modeset.c:818)
[ 19.416406][ T1] __drm_fb_helper_initial_config_and_unlock
(drivers/gpu/drm/drm_fb_helper.c:1830)
[ 19.416406][ T1] drm_fbdev_client_hotplug
(drivers/gpu/drm/clients/drm_fbdev_client.c:53)
[ 19.416406][ T1] drm_client_register (drivers/gpu/drm/drm_client.c:141)
[ 19.416406][ T1] drm_fbdev_client_setup
(drivers/gpu/drm/clients/drm_fbdev_client.c:167)
[ 19.416406][ T1] drm_client_setup
(drivers/gpu/drm/clients/drm_client_setup.c:47)
[ 19.416406][ T1] vkms_create (drivers/gpu/drm/vkms/vkms_drv.c:203)
[ 19.416406][ T1] ? drm_display_helper_module_init
(drivers/gpu/drm/vkms/vkms_drv.c:213)
[ 19.416406][ T1] vkms_init (drivers/gpu/drm/vkms/vkms_drv.c:221)
[ 19.416406][ T1] do_one_initcall (init/main.c:1269)
[ 19.416406][ T1] ? trace_event_raw_event_initcall_level (init/main.c:1260)
[ 19.416406][ T1] do_initcalls (init/main.c:1330 (discriminator 3)
init/main.c:1347 (discriminator 3))
[ 19.416406][ T1] kernel_init_freeable (init/main.c:1583)
[ 19.416406][ T1] ? rest_init (init/main.c:1461)
[ 19.416406][ T1] kernel_init (init/main.c:1471)
[ 19.416406][ T1] ? rest_init (init/main.c:1461)
[ 19.416406][ T1] ret_from_fork (arch/x86/kernel/process.c:154)
[ 19.416406][ T1] ? rest_init (init/main.c:1461)
[ 19.416406][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
[ 19.416406][ T1] </TASK>
[ 984.236393][ T23] INFO: task swapper/0:1 blocked for more than 491 seconds.
[ 984.237354][ T23] Not tainted 6.17.0-rc2-00290-g432c7653afa4 #1
[ 984.238322][ T23] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 984.239375][ T23] task:swapper/0 state:D stack:0 pid:1
tgid:1 ppid:0 task_flags:0x0140 flags:0x00004000
[ 984.240834][ T23] Call Trace:
[ 984.241228][ T23] <TASK>
[ 984.241634][ T23] __schedule (kernel/sched/core.c:5357
kernel/sched/core.c:6961)
[ 984.242202][ T23] ? io_schedule_timeout (kernel/sched/core.c:6817)
[ 984.242846][ T23] ? lock_acquire (include/trace/events/lock.h:24
(discriminator 2) kernel/locking/lockdep.c:5831 (discriminator 2))
[ 984.243441][ T23] schedule (kernel/sched/core.c:7044
kernel/sched/core.c:7058)
[ 984.243975][ T23] schedule_preempt_disabled (kernel/sched/core.c:7116)
[ 984.244639][ T23] __mutex_lock (kernel/locking/mutex.c:183
kernel/locking/mutex.c:678 kernel/locking/mutex.c:760)
[ 984.245258][ T23] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 984.246160][ T23] ? mutex_lock_io_nested (kernel/locking/mutex.c:759)
[ 984.246876][ T23] ? drm_print_bits (drivers/gpu/drm/drm_print.c:334)
[ 984.247486][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887)
[ 984.248132][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887)
[ 984.248681][ T23] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 984.249557][ T23] drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 984.250457][ T23] ? __drm_helper_update_and_validate
(drivers/gpu/drm/drm_probe_helper.c:561)
[ 984.251275][ T23] ? __kmalloc_noprof (include/trace/events/kmem.h:54
(discriminator 2) mm/slub.c:4366 (discriminator 2) mm/slub.c:4377
(discriminator 2))
[ 984.251990][ T23] drm_client_modeset_probe
(drivers/gpu/drm/drm_client_modeset.c:869 (discriminator 1))
[ 984.252659][ T23] ? drm_client_firmware_config
(drivers/gpu/drm/drm_client_modeset.c:818)
[ 984.253433][ T23] __drm_fb_helper_initial_config_and_unlock
(drivers/gpu/drm/drm_fb_helper.c:1830)
[ 984.254309][ T23] drm_fbdev_client_hotplug
(drivers/gpu/drm/clients/drm_fbdev_client.c:53)
[ 984.255079][ T23] drm_client_register (drivers/gpu/drm/drm_client.c:141)
[ 984.255737][ T23] drm_fbdev_client_setup
(drivers/gpu/drm/clients/drm_fbdev_client.c:167)
[ 984.256474][ T23] drm_client_setup
(drivers/gpu/drm/clients/drm_client_setup.c:47)
[ 984.257080][ T23] vkms_create (drivers/gpu/drm/vkms/vkms_drv.c:203)
[ 984.257646][ T23] ? drm_display_helper_module_init
(drivers/gpu/drm/vkms/vkms_drv.c:213)
[ 984.258477][ T23] vkms_init (drivers/gpu/drm/vkms/vkms_drv.c:221)
[ 984.258979][ T23] do_one_initcall (init/main.c:1269)
[ 984.259580][ T23] ? trace_event_raw_event_initcall_level (init/main.c:1260)
[ 984.260457][ T23] do_initcalls (init/main.c:1330 (discriminator 3)
init/main.c:1347 (discriminator 3))
[ 984.261031][ T23] kernel_init_freeable (init/main.c:1583)
[ 984.261730][ T23] ? rest_init (init/main.c:1461)
[ 984.262250][ T23] kernel_init (init/main.c:1471)
[ 984.262775][ T23] ? rest_init (init/main.c:1461)
[ 984.263366][ T23] ret_from_fork (arch/x86/kernel/process.c:154)
[ 984.263966][ T23] ? rest_init (init/main.c:1461)
[ 984.264445][ T23] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
[ 984.265087][ T23] </TASK>
[ 984.265460][ T23] INFO: task swapper/0:1 is blocked on a mutex likely
owned by task swapper/0:1.
[ 984.266569][ T23] task:swapper/0 state:D stack:0 pid:1
tgid:1 ppid:0 task_flags:0x0140 flags:0x00004000
[ 984.267995][ T23] Call Trace:
[ 984.268440][ T23] <TASK>
[ 984.268818][ T23] __schedule (kernel/sched/core.c:5357
kernel/sched/core.c:6961)
[ 984.269392][ T23] ? io_schedule_timeout (kernel/sched/core.c:6817)
[ 984.270076][ T23] ? lock_acquire (include/trace/events/lock.h:24
(discriminator 2) kernel/locking/lockdep.c:5831 (discriminator 2))
[ 984.270650][ T23] schedule (kernel/sched/core.c:7044
kernel/sched/core.c:7058)
[ 984.271187][ T23] schedule_preempt_disabled (kernel/sched/core.c:7116)
[ 984.271938][ T23] __mutex_lock (kernel/locking/mutex.c:183
kernel/locking/mutex.c:678 kernel/locking/mutex.c:760)
[ 984.272512][ T23] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 984.273417][ T23] ? mutex_lock_io_nested (kernel/locking/mutex.c:759)
[ 984.274100][ T23] ? drm_print_bits (drivers/gpu/drm/drm_print.c:334)
[ 984.274700][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887)
[ 984.275321][ T23] ? ww_mutex_lock (kernel/locking/mutex.c:887)
[ 984.275900][ T23] ? drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 984.276788][ T23] drm_helper_probe_single_connector_modes
(drivers/gpu/drm/drm_probe_helper.c:633)
[ 984.277636][ T23] ? __drm_helper_update_and_validate
(drivers/gpu/drm/drm_probe_helper.c:561)
[ 984.278471][ T23] ? __kmalloc_noprof (include/trace/events/kmem.h:54
(discriminator 2) mm/slub.c:4366 (discriminator 2) mm/slub.c:4377
(discriminator 2))
[ 984.279094][ T23] drm_client_modeset_probe
(drivers/gpu/drm/drm_client_modeset.c:869 (discriminator 1))
[ 984.279852][ T23] ? drm_client_firmware_config
(drivers/gpu/drm/drm_client_modeset.c:818)
[ 984.280602][ T23] __drm_fb_helper_initial_config_and_unlock
(drivers/gpu/drm/drm_fb_helper.c:1830)
[ 984.281537][ T23] drm_fbdev_client_hotplug
(drivers/gpu/drm/clients/drm_fbdev_client.c:53)
[ 984.282238][ T23] drm_client_register (drivers/gpu/drm/drm_client.c:141)
[ 984.282887][ T23] drm_fbdev_client_setup
(drivers/gpu/drm/clients/drm_fbdev_client.c:167)
[ 984.283611][ T23] drm_client_setup
(drivers/gpu/drm/clients/drm_client_setup.c:47)
[ 984.284232][ T23] vkms_create (drivers/gpu/drm/vkms/vkms_drv.c:203)
[ 984.284846][ T23] ? drm_display_helper_module_init
(drivers/gpu/drm/vkms/vkms_drv.c:213)
[ 984.285609][ T23] vkms_init (drivers/gpu/drm/vkms/vkms_drv.c:221)
[ 984.286136][ T23] do_one_initcall (init/main.c:1269)
[ 984.286773][ T23] ? trace_event_raw_event_initcall_level (init/main.c:1260)
[ 984.287581][ T23] do_initcalls (init/main.c:1330 (discriminator 3)
init/main.c:1347 (discriminator 3))
[ 984.288212][ T23] kernel_init_freeable (init/main.c:1583)
[ 984.288856][ T23] ? rest_init (init/main.c:1461)
[ 984.289412][ T23] kernel_init (init/main.c:1471)
[ 984.289983][ T23] ? rest_init (init/main.c:1461)
[ 984.290537][ T23] ret_from_fork (arch/x86/kernel/process.c:154)
[ 984.291124][ T23] ? rest_init (init/main.c:1461)
[ 984.291735][ T23] ret_from_fork_asm (arch/x86/entry/entry_64.S:255)
[ 984.292371][ T23] </TASK>
[ 984.292826][ T23] INFO: lockdep is turned off.
[ 1045.677903][ C0] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0
nice=0 stuck for 59s!
[ 1045.680667][ C0] Showing busy workqueues and worker pools:
[ 1045.684192][ C0] workqueue events_power_efficient: flags=0x80
[ 1045.684971][ C0] pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
[ 1045.684987][ C0] pending: neigh_managed_work, neigh_periodic_work,
do_cache_clean
[ 1045.685083][ C0] Showing backtraces of running workers in stalled
CPU-bound worker pools:
[ 1076.396346][ C0] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0
nice=0 stuck for 89s!
[ 1076.400410][ C0] Showing busy workqueues and worker pools:
[ 1076.401145][ C0] workqueue events: flags=0x0
[ 1076.401765][ C0] pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2
[ 1076.401781][ C0] pending: stop_one_cpu_nowait_workfn
[ 1076.401795][ C0] workqueue events_power_efficient: flags=0x80
[ 1076.404125][ C0] pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=3 refcnt=4
[ 1076.404141][ C0] pending: neigh_managed_work, neigh_periodic_work,
do_cache_clean
[ 1076.411517][ C0] Showing backtraces of running workers in stalled
CPU-bound worker pools:
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250925/[email protected]
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
