Date:	Fri, 13 Dec 2013 15:36:51 +0100
From:	Arkadiusz Bubała <arkadiusz.bubala@...n-e.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [BUG] System hangs under a heavy load on kernel 3.4

Hello,
we've got problems with kernel 3.4. It hangs during stability tests. 
Messages "INFO: rcu_sched self detected stall on CPU..." are still sent 
to the console but network is down and system doesn't react on key press.
Test creates volume group with two logical volumes and 20 snapshots of 
size five times smaller than LV. Snapshots are periodically started and 
stopped while logical volumes are filled by dd processes. XFS filesystem 
is used. It happens on different machines.

Already we have captured two different call traces (the second one 
happened twice also on 3.4.69):

34519.493785] INFO: rcu_sched self-detected stall on CPU { 6}  (t=6000 jiffies)
[34519.493791] Pid: 39642, comm: mount Tainted: G           O 3.4.69-oe64-00000-g8e19b63 #1
[34519.493793] Call Trace:
[34519.493794]<IRQ>   [<ffffffff8100fcca>] ? update_vsyscall+0xaa/0xd0
[34519.493803]  [<ffffffff8109e34e>] ? __rcu_pending+0xbe/0x420
[34519.493805]  [<ffffffff8109e6cf>] ? rcu_pending+0x1f/0x50
[34519.493807]  [<ffffffff8109eea5>] ? rcu_check_callbacks+0x25/0x60
[34519.493810]  [<ffffffff81048e1f>] ? update_process_times+0x3f/0x80
[34519.493814]  [<ffffffff8107439b>] ? tick_sched_timer+0x5b/0xa0
[34519.493825]  [<ffffffff8105b348>] ? __run_hrtimer+0x68/0x100
[34519.493827]  [<ffffffff81074340>] ? tick_do_update_jiffies64+0xc0/0xc0
[34519.493829]  [<ffffffff8105b4b7>] ? hrtimer_interrupt+0xd7/0x230
[34519.493833]  [<ffffffff810269c3>] ? smp_apic_timer_interrupt+0x63/0xa0
[34519.493837]  [<ffffffff815fbc0a>] ? apic_timer_interrupt+0x6a/0x70
[34519.493838]<EOI>   [<ffffffff8102e1e4>] ? __ticket_spin_lock+0x14/0x20
[34519.493844]  [<ffffffff815f51fb>] ? _raw_spin_lock_irqsave+0x2b/0x50
[34519.493846]  [<ffffffff815f51c5>] ? _raw_spin_lock+0x5/0x10
[34519.493849]  [<ffffffff812b76f8>] ? _atomic_dec_and_lock+0x48/0x70
[34519.493852]  [<ffffffff8121b969>] ? xfs_buf_rele+0x39/0xc0
[34519.493855]  [<ffffffff8121c8d1>] ? xfs_flush_buftarg+0x101/0x120
[34519.493857]  [<ffffffff8121c91a>] ? xfs_free_buftarg+0x2a/0x60
[34519.493859]  [<ffffffff81229b18>] ? xfs_fs_fill_super+0x178/0x280
[34519.493863]  [<ffffffff810ee0a9>] ? mount_bdev+0x1b9/0x1f0
[34519.493864]  [<ffffffff812299a0>] ? xfs_parseargs+0xbc0/0xbc0
[34519.493868]  [<ffffffff810db46c>] ? alloc_pages_current+0xac/0x120
[34519.493870]  [<ffffffff810edcde>] ? mount_fs+0x3e/0x180
[34519.493874]  [<ffffffff81107c95>] ? vfs_kern_mount+0x65/0xf0
[34519.493877]  [<ffffffff81107da3>] ? do_kern_mount+0x53/0x110
[34519.493879]  [<ffffffff811083b4>] ? do_mount+0x554/0x790
[34519.493883]  [<ffffffff8112ed39>] ? compat_sys_mount+0xa9/0x240
[34519.493885]  [<ffffffff815fcbd9>] ? ia32_do_call+0x13/0x13


Dec 13 14:13:27 [kern.err] kernel: [ 5493.913816] INFO: rcu_sched self-detected stall on CPU { 4}  (t=7647 jiffies)

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913819] Pid: 12889, comm: syslog-ng Tainted: G           O 3.4.58-oe64-00000-g46d0e40 #15

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913821] Call Trace:

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913822]<IRQ>   [<ffffffff8100fcca>] ? update_vsyscall+0xaa/0xd0

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913827]  [<ffffffff8109e2fe>] ? __rcu_pending+0xbe/0x420

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913829]  [<ffffffff8109e67f>] ? rcu_pending+0x1f/0x50

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913830]  [<ffffffff8109ee55>] ? rcu_check_callbacks+0x25/0x60

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913832]  [<ffffffff81048e1f>] ? update_process_times+0x3f/0x80

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913834]  [<ffffffff8107434b>] ? tick_sched_timer+0x5b/0xa0

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913836]  [<ffffffff8105b328>] ? __run_hrtimer+0x68/0x100

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913838]  [<ffffffff810742f0>] ? tick_do_update_jiffies64+0xc0/0xc0

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913839]  [<ffffffff8105b497>] ? hrtimer_interrupt+0xd7/0x230

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913841]  [<ffffffff810269c3>] ? smp_apic_timer_interrupt+0x63/0xa0

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913844]  [<ffffffff815fb3ca>] ? apic_timer_interrupt+0x6a/0x70

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913844]<EOI>   [<ffffffff812c23f0>] ? __const_udelay+0x40/0x40

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913848]  [<ffffffff8103df0b>] ? console_unlock+0x19b/0x280

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913850]  [<ffffffff8136007d>] ? do_con_write+0x63d/0x1d80

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913853]  [<ffffffff810fca80>] ? __pollwait+0x120/0x120

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913855]  [<ffffffff810f00ff>] ? copy_strings+0x19f/0x200

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913856]  [<ffffffff810fca80>] ? __pollwait+0x120/0x120

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913858]  [<ffffffff81361816>] ? con_write+0x16/0x40

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913860]  [<ffffffff8134da2d>] ? n_tty_write+0x1cd/0x3c0

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913862]  [<ffffffff810630d0>] ? try_to_wake_up+0x280/0x280

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913863]  [<ffffffff81349dab>] ? tty_write+0x19b/0x260

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913865]  [<ffffffff8134d860>] ? n_tty_ioctl+0xc0/0xc0

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913866]  [<ffffffff810eac60>] ? vfs_write+0xd0/0x170

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913868]  [<ffffffff810eb413>] ? sys_write+0x53/0x90

Dec 13 14:13:27 [kern.err] kernel: [ 5493.913870]  [<ffffffff815fc399>] ? ia32_do_call+0x13/0x13


Does anyone have idea what is the cause of this issues?

-- 
Best regards
Arkadiusz Bubała
Open-E Poland Sp. z o.o.
www.open-e.com

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