From: kernel test robot <oliver.sang@intel.com>
To: Marius Vlad <marius.vlad@collabora.com>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
<dri-devel@lists.freedesktop.org>, <daniel.stone@collabora.com>,
<dmitry.baryshkov@oss.qualcomm.com>,
<jani.nikula@linux.intel.com>, <tzimmermann@suse.de>,
<simona.vetter@ffwll.ch>, <derek.foreman@collabora.com>,
<oliver.sang@intel.com>
Subject: Re: [PATCH 1/2] drm: Introduce a new connector status
Date: Thu, 25 Sep 2025 14:51:46 +0800 [thread overview]
Message-ID: <202509251410.fdfbcac3-lkp@intel.com> (raw)
In-Reply-To: <20250923083636.4749-2-marius.vlad@collabora.com>
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/20250923083636.4749-2-marius.vlad@collabora.com/
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 <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202509251410.fdfbcac3-lkp@intel.com
[ 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/20250925/202509251410.fdfbcac3-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next prev parent reply other threads:[~2025-09-25 6:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-23 8:36 [PATCH v3 0/2] Pass down hot plug CONNECTOR ID to user-space Marius Vlad
2025-09-23 8:36 ` [PATCH 1/2] drm: Introduce a new connector status Marius Vlad
2025-09-23 15:53 ` Dmitry Baryshkov
2025-11-03 18:07 ` Marius Vlad
2025-09-23 17:34 ` Ian Forbes
2025-11-03 18:01 ` Marius Vlad
2025-09-25 6:51 ` kernel test robot [this message]
2025-09-23 8:36 ` [PATCH 2/2] drm: Propagate connector status change Marius Vlad
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202509251410.fdfbcac3-lkp@intel.com \
--to=oliver.sang@intel.com \
--cc=daniel.stone@collabora.com \
--cc=derek.foreman@collabora.com \
--cc=dmitry.baryshkov@oss.qualcomm.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=jani.nikula@linux.intel.com \
--cc=lkp@intel.com \
--cc=marius.vlad@collabora.com \
--cc=oe-lkp@lists.linux.dev \
--cc=simona.vetter@ffwll.ch \
--cc=tzimmermann@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.