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Date: Tue, 11 Oct 2016 13:51:53 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: Ingo Molnar <mingo@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
Peter Zijlstra <peterz@...radead.org>,
David Miller <davem@...emloft.net>,
Hannes Frederic Sowa <hannes@...hat.com>,
Jesper Dangaard Brouer <jbrouer@...hat.com>,
Jonathan Corbet <corbet@....net>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Rik van Riel <riel@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [softirq] 4cd13c21b2: INFO: rcu_sched self-detected stall on
CPU
FYI, we noticed the following commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 4cd13c21b207e80ddb1144c576500098f2d5f882 ("softirq: Let ksoftirqd do its job")
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -smp 2 -m 512M
caused below changes:
+------------------------------------------------+------------+------------+
| | b8129a1f6a | 4cd13c21b2 |
+------------------------------------------------+------------+------------+
| boot_successes | 0 | 0 |
| boot_failures | 80 | 80 |
| calltrace:SyS_open | 78 | 80 |
| BUG:workqueue_lockup-pool | 80 | 46 |
| IP-Config:Auto-configuration_of_network_failed | 0 | 5 |
| INFO:rcu_sched_self-detected_stall_on_CPU | 0 | 33 |
| INFO:rcu_sched_detected_stalls_on_CPUs/tasks | 0 | 31 |
| calltrace:mark_rodata_ro | 0 | 33 |
| invoked_oom-killer:gfp_mask=0x | 0 | 3 |
| Mem-Info | 0 | 3 |
| Out_of_memory:Kill_process | 0 | 2 |
| BUG:kernel_hang_in_test_stage | 0 | 27 |
+------------------------------------------------+------------+------------+
[ 23.488574] Freeing unused kernel memory: 3428K (ffffffff8390e000 - ffffffff83c67000)
[ 23.489865] Write protecting the kernel read-only data: 34816k
[ 23.510721] Freeing unused kernel memory: 1864K (ffff88000262e000 - ffff880002800000)
[ 23.527185] Freeing unused kernel memory: 128K (ffff8800031e0000 - ffff880003200000)
[ 135.341384] INFO: rcu_sched self-detected stall on CPU
[ 135.345265] INFO: rcu_sched detected stalls on CPUs/tasks:
[ 135.345294] Task dump for CPU 0:
[ 135.345305] swapper/0 R running task 0 1 0 0x00080008
[ 135.345317] ffffffff8100401a ffff880017ae2000 ffffffff82629061 0000000000000000
[ 135.345327] ffffffff8326e260 fffffac2858c5000 ffff880017aefc50 ffffffff81159fee
[ 135.345338] ffff880017aefe68 8000000000000161 ffff880017aefca8 ffffffff8100401a
[ 135.345340] Call Trace:
[ 135.345353] [<ffffffff8100401a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 135.345363] [<ffffffff82629061>] ? retint_kernel+0x10/0x10
[ 135.345372] [<ffffffff81159fee>] ? trace_hardirqs_on_caller+0x1ae/0x2e0
[ 135.345381] [<ffffffff8100401a>] ? trace_hardirqs_on_thunk+0x1a/0x1c
[ 135.345390] [<ffffffff810e5870>] ? irq_exit+0xd0/0x180
[ 135.345398] [<ffffffff82629061>] ? retint_kernel+0x10/0x10
[ 135.345408] [<ffffffff81098867>] ? note_page+0xac7/0xea0
[ 135.345417] [<ffffffff81098867>] ? note_page+0xac7/0xea0
[ 135.345426] [<ffffffff8109820c>] ? note_page+0x46c/0xea0
[ 135.345436] [<ffffffff810991c2>] ? ptdump_walk_pgd_level_core+0x582/0x5e0
[ 135.345445] [<ffffffff81098c40>] ? note_page+0xea0/0xea0
[ 135.345455] [<ffffffff81099267>] ? ptdump_walk_pgd_level_checkwx+0x17/0x20
[ 135.345463] [<ffffffff810873cc>] ? mark_rodata_ro+0x10c/0x120
[ 135.345472] [<ffffffff8261adb4>] ? kernel_init+0x34/0x180
[ 135.345480] [<ffffffff826288af>] ? ret_from_fork+0x1f/0x40
[ 135.345488] [<ffffffff8261ad80>] ? rest_init+0x180/0x180
[ 135.372126] Task dump for CPU 0:
[ 135.372637] swapper/0 R running task 0 1 0 0x00080008
[ 135.378686] 0000000000000000 ffff880017e07de8 ffffffff8112bfed ffffffff8112bed3
[ 135.382196] ffff880017e07df8 0000000041b58ab3 ffffffff830edea2 ffffffff8112be10
[ 135.386448] 0000000000000046 ffffffff00000000 ffffffff832c7038 ffffffff8125ebf0
[ 135.387952] Call Trace:
[ 135.388373] <IRQ> [<ffffffff8112bfed>] sched_show_task+0x1dd/0x320
[ 135.389427] [<ffffffff8112bed3>] ? sched_show_task+0xc3/0x320
[ 135.390613] [<ffffffff8112be10>] ? SyS_sched_rr_get_interval+0x320/0x320
[ 135.391683] [<ffffffff8125ebf0>] ? rcu_dump_cpu_stacks+0x5c/0x182
[ 135.392629] [<ffffffff8125eca9>] ? rcu_dump_cpu_stacks+0x115/0x182
[ 135.393838] [<ffffffff811303cd>] dump_cpu_task+0x4d/0x60
[ 135.394768] [<ffffffff8125ecc4>] rcu_dump_cpu_stacks+0x130/0x182
[ 135.395762] [<ffffffff8119ad44>] rcu_check_callbacks+0x10e4/0x1180
[ 135.396770] [<ffffffff810e5f5c>] ? raise_softirq+0x7c/0x90
[ 135.398051] [<ffffffff811a5ff0>] update_process_times+0x30/0x60
[ 135.399086] [<ffffffff811c3d54>] tick_nohz_handler+0xf4/0x230
[ 135.400050] [<ffffffff810751ca>] local_apic_timer_interrupt+0x4a/0x80
[ 135.401279] [<ffffffff8262aa62>] smp_apic_timer_interrupt+0x52/0x70
[ 135.402346] [<ffffffff82629f61>] apic_timer_interrupt+0x91/0xa0
[ 135.403327] <EOI> [<ffffffff81098867>] ? note_page+0xac7/0xea0
[ 135.404432] [<ffffffff8109820c>] ? note_page+0x46c/0xea0
[ 135.405380] [<ffffffff810991c2>] ptdump_walk_pgd_level_core+0x582/0x5e0
[ 135.406445] [<ffffffff81098c40>] ? note_page+0xea0/0xea0
[ 135.407438] [<ffffffff81099267>] ptdump_walk_pgd_level_checkwx+0x17/0x20
[ 135.408585] [<ffffffff810873cc>] mark_rodata_ro+0x10c/0x120
[ 135.409474] [<ffffffff8261adb4>] kernel_init+0x34/0x180
[ 135.410789] [<ffffffff826288af>] ret_from_fork+0x1f/0x40
[ 135.411660] [<ffffffff8261ad80>] ? rest_init+0x180/0x180
[ 158.650460] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 158.666306] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 127s!
[ 158.666320] Showing busy workqueues and worker pools:
[ 158.666324] workqueue events: flags=0x0
[ 158.666351] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 158.666362] pending: vmstat_shepherd
[ 158.666803] Writes: Total: 4 Max/Min: 0/0 Fail: 0
[ 158.753030] random: init: uninitialized urandom read (12 bytes read)
Thanks,
Xiaolong
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