Bug 1469758
| Summary: | WARNING: possible circular locking dependency detected flush_work | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | John Bieren <jbieren> |
| Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
| Status: | CLOSED EOL | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | rawhide | CC: | gansalmon, ichavero, itamar, jonathan, kernel-maint, labbott, madhu.chinakonda, mchehab |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2018-04-06 18:37:14 UTC | Type: | Bug |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
Doing some pruning, this bug looks to be several kernel versions old. Please test on a newer kernel and reopen if the problem still exists. |
Description of problem: Warning during boot for possible circular locking dependency Version-Release number of selected component (if applicable): kernel-4.13.0-0.rc0.git4.1.fc27.x86_64 Steps to Reproduce: 1. Boot kernel 2. 3. Actual results: [ 32.763981] powernow_k8: Found 2 Dual-Core AMD Opteron(tm) Processor 2214 HE (4 cpu cores) (version 2.20.00) Starting File System Check on /dev/…c55-faa3-4962-922f-66399b732fde... [ 32.874017] [ 32.875033] ====================================================== [ 32.875033] WARNING: possible circular locking dependency detected [ 32.875033] 4.13.0-0.rc0.git4.1.fc27.x86_64 #1 Not tainted [ 32.875033] ------------------------------------------------------ [ 32.875033] kworker/2:1/35 is trying to acquire lock: [ 32.875033] ((&wfc.work)){+.+.+.}, at: [<ffffffffb90cf6a5>] flush_work+0x35/0x320 [ 32.875033] [ 32.875033] but task is already holding lock: [ 32.875033] (&policy_dbs->update_mutex){+.+...}, at: [<ffffffffb97bd97f>] dbs_work_handler+0x2f/0x70 [ 32.875033] [ 32.875033] which lock already depends on the new lock. [ 32.875033] [ 32.875033] [ 32.875033] the existing dependency chain (in reverse order) is: [ 32.875033] [ 32.875033] -> #4 (&policy_dbs->update_mutex){+.+...}: [ 32.875033] lock_acquire+0xa3/0x1f0 [ 32.875033] __mutex_lock+0x86/0x9f0 [ 32.875033] mutex_lock_nested+0x1b/0x20 [ 32.875033] cpufreq_dbs_governor_limits+0x23/0x70 [ 32.875033] cpufreq_start_governor.part.10+0x4f/0x90 [ 32.875033] cpufreq_set_policy+0x184/0x2f0 [ 32.875033] cpufreq_init_policy+0x7e/0xf0 [ 32.875033] cpufreq_online+0x622/0x7a0 [ 32.875033] cpufreq_add_dev+0x51/0x80 [ 32.875033] subsys_interface_register+0xe1/0x160 [ 32.875033] cpufreq_register_driver+0x15d/0x230 [ 32.875033] powernowk8_init+0x126/0x1c5 [powernow_k8] [ 32.875033] do_one_initcall+0x50/0x192 [ 32.875033] do_init_module+0x5f/0x1eb [ 32.875033] load_module+0x24b0/0x2b50 [ 32.875033] SYSC_init_module+0x183/0x1c0 [ 32.875033] SyS_init_module+0xe/0x10 [ 32.875033] do_syscall_64+0x6c/0x1c0 [ 32.875033] return_from_SYSCALL_64+0x0/0x7a [ 32.875033] [ 32.875033] -> #3 (&policy->rwsem){+.+.+.}: [ 32.875033] lock_acquire+0xa3/0x1f0 [ 32.875033] down_write+0x51/0xc0 [ 32.875033] cpufreq_policy_free+0xc7/0x150 [ 32.875033] cpufreq_online+0xef/0x7a0 [ 32.875033] cpufreq_add_dev+0x51/0x80 [ 32.875033] subsys_interface_register+0xe1/0x160 [ 32.875033] cpufreq_register_driver+0x15d/0x230 [ 32.875033] ipmi_fasync+0x3f/0x60 [ipmi_devintf] [ 32.875033] do_one_initcall+0x50/0x192 [ 32.875033] do_init_module+0x5f/0x1eb [ 32.875033] load_module+0x24b0/0x2b50 [ 32.875033] SYSC_init_module+0x183/0x1c0 [ 32.875033] SyS_init_module+0xe/0x10 [ 32.875033] do_syscall_64+0x6c/0x1c0 [ 32.875033] return_from_SYSCALL_64+0x0/0x7a [ 32.875033] [ 32.875033] -> #2 (subsys mutex#5){+.+.+.}: [ 32.875033] lock_acquire+0xa3/0x1f0 [ 32.875033] __mutex_lock+0x86/0x9f0 [ 32.875033] mutex_lock_nested+0x1b/0x20 [ 32.875033] subsys_interface_register+0x7d/0x160 [ 32.875033] cpufreq_register_driver+0x15d/0x230 [ 32.875033] ipmi_fasync+0x3f/0x60 [ipmi_devintf] [ 32.875033] do_one_initcall+0x50/0x192 [ 32.875033] do_init_module+0x5f/0x1eb [ 32.875033] load_module+0x24b0/0x2b50 [ 32.875033] SYSC_init_module+0x183/0x1c0 [ 32.875033] SyS_init_module+0xe/0x10 [ 32.875033] do_syscall_64+0x6c/0x1c0 [ 32.875033] return_from_SYSCALL_64+0x0/0x7a [ 32.875033] [ 32.875033] -> #1 (cpu_hotplug_lock.rw_sem){++++++}: [ 32.875033] lock_acquire+0xa3/0x1f0 [ 32.875033] cpus_read_lock+0x42/0x90 [ 32.875033] apply_workqueue_attrs+0x17/0x50 [ 32.875033] __alloc_workqueue_key+0x1b3/0x500 [ 32.875033] scsi_host_alloc+0x376/0x480 [ 32.875033] mptsas_probe+0xce/0x550 [mptsas] [ 32.875033] local_pci_probe+0x42/0xa0 [ 32.875033] work_for_cpu_fn+0x14/0x20 [ 32.875033] process_one_work+0x253/0x6a0 [ 32.875033] worker_thread+0x1d6/0x3b0 [ 32.875033] kthread+0x133/0x150 [ 32.875033] ret_from_fork+0x2a/0x40 [ 32.875033] [ 32.875033] -> #0 ((&wfc.work)){+.+.+.}: [ 32.875033] __lock_acquire+0x1367/0x13b0 [ 32.875033] lock_acquire+0xa3/0x1f0 [ 32.875033] flush_work+0x58/0x320 [ 32.875033] work_on_cpu+0xa1/0xd0 [ 32.875033] powernowk8_target+0x36/0x50 [powernow_k8] [ 32.875033] __cpufreq_driver_target+0x1ad/0x560 [ 32.875033] od_dbs_update+0xc6/0x1b0 [ 32.875033] dbs_work_handler+0x39/0x70 [ 32.875033] process_one_work+0x253/0x6a0 [ 32.875033] worker_thread+0x4d/0x3b0 [ 32.875033] kthread+0x133/0x150 [ 32.875033] ret_from_fork+0x2a/0x40 [ 32.875033] [ 32.875033] other info that might help us debug this: [ 32.875033] [ 32.875033] Chain exists of: [ 32.875033] (&wfc.work) --> &policy->rwsem --> &policy_dbs->update_mutex [ 32.875033] [ 32.875033] Possible unsafe locking scenario: [ 32.875033] [ 32.875033] CPU0 CPU1 [ 32.875033] ---- ---- [ 32.875033] lock(&policy_dbs->update_mutex); [ 32.875033] lock(&policy->rwsem); [ 32.875033] lock(&policy_dbs->update_mutex); [ 32.875033] lock((&wfc.work)); [ 32.875033] [ 32.875033] *** DEADLOCK *** [ 32.875033] [ 32.875033] 3 locks held by kworker/2:1/35: [ 32.875033] #0: ("events"){.+.+.+}, at: [<ffffffffb90d2280>] process_one_work+0x1d0/0x6a0 [ 32.875033] #1: ((&policy_dbs->work)){+.+...}, at: [<ffffffffb90d2280>] process_one_work+0x1d0/0x6a0 [ 32.875033] #2: (&policy_dbs->update_mutex){+.+...}, at: [<ffffffffb97bd97f>] dbs_work_handler+0x2f/0x70 [ 32.875033] [ 32.875033] stack backtrace: [ 32.875033] CPU: 2 PID: 35 Comm: kworker/2:1 Not tainted 4.13.0-0.rc0.git4.1.fc27.x86_64 #1 [ 32.875033] Hardware name: Dell Inc. PowerEdge M605/0NC596, BIOS 4.0.2 09/29/2008 [ 32.875033] Workqueue: events dbs_work_handler [ 32.875033] Call Trace: [ 32.875033] dump_stack+0x8e/0xd6 [ 32.875033] print_circular_bug+0x1b6/0x210 [ 32.875033] __lock_acquire+0x1367/0x13b0 [ 32.875033] ? sched_clock+0x9/0x10 [ 32.875033] lock_acquire+0xa3/0x1f0 [ 32.875033] ? lock_acquire+0xa3/0x1f0 [ 32.875033] ? flush_work+0x35/0x320 [ 32.875033] ? sched_clock+0x9/0x10 [ 32.875033] flush_work+0x58/0x320 [ 32.875033] ? flush_work+0x35/0x320 [ 32.875033] ? mark_held_locks+0x5f/0x90 [ 32.875033] ? queue_work_on+0x47/0xa0 [ 32.875033] ? trace_hardirqs_on_caller+0xf4/0x190 [ 32.875033] ? trace_hardirqs_on+0xd/0x10 [ 32.875033] work_on_cpu+0xa1/0xd0 [ 32.875033] ? work_is_static_object+0x20/0x20 [ 32.875033] ? powernowk8_cpu_exit+0xb0/0xb0 [powernow_k8] [ 32.875033] powernowk8_target+0x36/0x50 [powernow_k8] [ 32.875033] __cpufreq_driver_target+0x1ad/0x560 [ 32.875033] od_dbs_update+0xc6/0x1b0 [ 32.875033] dbs_work_handler+0x39/0x70 [ 32.875033] process_one_work+0x253/0x6a0 [ 32.875033] worker_thread+0x4d/0x3b0 [ 32.875033] kthread+0x133/0x150 [ 32.875033] ? process_one_work+0x6a0/0x6a0 [ 32.875033] ? kthread_create_on_node+0x70/0x70 [ 32.875033] ret_from_fork+0x2a/0x40 Expected results: No warning Additional info: