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Date: Tue, 21 Mar 2017 12:52:24 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...nel.org>,
Chris Wilson <chris@...is-wilson.co.uk>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp-robot] [locking/ww_mutex] bf7b3ac2e3:
INFO:task_blocked_for_more_than#seconds
FYI, we noticed the following commit:
commit: bf7b3ac2e36ac054f93e5dd8d85dfd754b5e1c09 ("locking/ww_mutex: Improve test to cover acquire context changes")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 2G
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
+--------------------------------------------------+------------+------------+
| | 383776fa75 | bf7b3ac2e3 |
+--------------------------------------------------+------------+------------+
| boot_successes | 18 | 3 |
| boot_failures | 0 | 15 |
| INFO:task_blocked_for_more_than#seconds | 0 | 15 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 15 |
| calltrace:debug_show_all_locks | 0 | 6 |
+--------------------------------------------------+------------+------------+
[ 248.961691] INFO: task swapper:1 blocked for more than 120 seconds.
[ 248.961691] INFO: task swapper:1 blocked for more than 120 seconds.
[ 249.009818] Not tainted 4.11.0-rc2-00010-gbf7b3ac #1
[ 249.009818] Not tainted 4.11.0-rc2-00010-gbf7b3ac #1
[ 249.038399] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.038399] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.083512] swapper D11856 1 0 0x00000000
[ 249.083512] swapper D11856 1 0 0x00000000
[ 249.113610] Call Trace:
[ 249.113610] Call Trace:
[ 249.140090] __schedule+0x4c2/0x520
[ 249.140090] __schedule+0x4c2/0x520
[ 249.161677] ? ___preempt_schedule+0x16/0x18
[ 249.161677] ? ___preempt_schedule+0x16/0x18
[ 249.210605] schedule+0x26/0x3b
[ 249.210605] schedule+0x26/0x3b
[ 249.229561] schedule_timeout+0x2b/0x2bc
[ 249.229561] schedule_timeout+0x2b/0x2bc
[ 249.257556] wait_for_common+0x11e/0x1b5
[ 249.257556] wait_for_common+0x11e/0x1b5
[ 249.279561] ? try_to_wake_up+0x19f/0x19f
[ 249.279561] ? try_to_wake_up+0x19f/0x19f
[ 249.319167] wait_for_completion+0x18/0x1a
[ 249.319167] wait_for_completion+0x18/0x1a
[ 249.341751] flush_workqueue+0x2ac/0x5c9
[ 249.341751] flush_workqueue+0x2ac/0x5c9
[ 249.384465] ? flush_workqueue+0xa7/0x5c9
[ 249.384465] ? flush_workqueue+0xa7/0x5c9
[ 249.406499] ? _raw_spin_unlock_irqrestore+0x49/0x5d
[ 249.406499] ? _raw_spin_unlock_irqrestore+0x49/0x5d
[ 249.436407] ? _raw_spin_unlock+0x3f/0x43
[ 249.436407] ? _raw_spin_unlock+0x3f/0x43
[ 249.458614] ? __queue_work+0x2c1/0x2d0
[ 249.458614] ? __queue_work+0x2c1/0x2d0
[ 249.485798] ? get_random_order+0x7e/0x7e
[ 249.485798] ? get_random_order+0x7e/0x7e
[ 249.511661] ? get_random_order+0x7e/0x7e
[ 249.511661] ? get_random_order+0x7e/0x7e
[ 249.533689] stress+0x1a0/0x1d4
[ 249.533689] stress+0x1a0/0x1d4
[ 249.551804] test_ww_mutex_init+0x28a/0x2ce
[ 249.551804] test_ww_mutex_init+0x28a/0x2ce
[ 249.590171] ? proc_create_data+0xa1/0xbc
[ 249.590171] ? proc_create_data+0xa1/0xbc
[ 249.613023] ? lock_torture_init+0x59b/0x59b
[ 249.613023] ? lock_torture_init+0x59b/0x59b
[ 249.639818] do_one_initcall+0x86/0x155
[ 249.639818] do_one_initcall+0x86/0x155
[ 249.661813] kernel_init_freeable+0x110/0x19a
[ 249.661813] kernel_init_freeable+0x110/0x19a
[ 249.696422] ? kernel_init_freeable+0x19a/0x19a
[ 249.696422] ? kernel_init_freeable+0x19a/0x19a
[ 249.728401] ? rest_init+0xbf/0xbf
[ 249.728401] ? rest_init+0xbf/0xbf
[ 249.755948] kernel_init+0x9/0xf3
[ 249.755948] kernel_init+0x9/0xf3
[ 249.771735] ret_from_fork+0x2c/0x40
[ 249.771735] ret_from_fork+0x2c/0x40
[ 249.793736]
[ 249.793736] Showing all locks held in the system:
[ 249.793736]
[ 249.793736] Showing all locks held in the system:
[ 249.831650] 2 locks held by khungtaskd/15:
[ 249.831650] 2 locks held by khungtaskd/15:
[ 249.851454] #0: (rcu_read_lock){......}, at: [<ffffffff8111f204>] watchdog+0x96/0x352
[ 249.851454] #0: (rcu_read_lock){......}, at: [<ffffffff8111f204>] watchdog+0x96/0x352
[ 249.885734] #1: (tasklist_lock){......}, at: [<ffffffff810e757b>] debug_show_all_locks+0x52/0x193
[ 249.885734] #1: (tasklist_lock){......}, at: [<ffffffff810e757b>] debug_show_all_locks+0x52/0x193
[ 249.923459]
[ 249.923459]
[ 249.929288] =============================================
[ 249.929288]
[ 249.929288] =============================================
[ 249.929288]
[ 249.969510] NMI backtrace for cpu 0
[ 249.969510] NMI backtrace for cpu 0
[ 249.985283] CPU: 0 PID: 15 Comm: khungtaskd Not tainted 4.11.0-rc2-00010-gbf7b3ac #1
[ 249.985283] CPU: 0 PID: 15 Comm: khungtaskd Not tainted 4.11.0-rc2-00010-gbf7b3ac #1
[ 250.019213] Call Trace:
[ 250.019213] Call Trace:
[ 250.030263] dump_stack+0x19/0x1b
[ 250.030263] dump_stack+0x19/0x1b
[ 250.045041] nmi_cpu_backtrace+0x7e/0x8f
[ 250.045041] nmi_cpu_backtrace+0x7e/0x8f
[ 250.062538] ? hw_nmi_get_sample_period+0x1a/0x1a
[ 250.062538] ? hw_nmi_get_sample_period+0x1a/0x1a
[ 250.082901] nmi_trigger_cpumask_backtrace+0x6d/0xee
[ 250.082901] nmi_trigger_cpumask_backtrace+0x6d/0xee
[ 250.104805] arch_trigger_cpumask_backtrace+0x14/0x16
[ 250.104805] arch_trigger_cpumask_backtrace+0x14/0x16
[ 250.127415] watchdog+0x2c0/0x352
[ 250.127415] watchdog+0x2c0/0x352
[ 250.142257] ? watchdog+0x96/0x352
[ 250.142257] ? watchdog+0x96/0x352
[ 250.157658] ? reset_hung_task_detector+0x14/0x14
[ 250.157658] ? reset_hung_task_detector+0x14/0x14
[ 250.178488] ? reset_hung_task_detector+0x14/0x14
[ 250.178488] ? reset_hung_task_detector+0x14/0x14
[ 250.199652] kthread+0x117/0x11f
[ 250.199652] kthread+0x117/0x11f
[ 250.214069] ? kthreadd+0x158/0x158
[ 250.214069] ? kthreadd+0x158/0x158
To reproduce:
git clone https://github.com/01org/lkp-tests.git
cd lkp-tests
bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
Thanks,
Xiaolong
View attachment "config-4.11.0-rc2-00010-gbf7b3ac" of type "text/plain" (98724 bytes)
View attachment "job-script" of type "text/plain" (4096 bytes)
Download attachment "dmesg.xz" of type "application/octet-stream" (8128 bytes)
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