linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141226225744.GA30955@codemonkey.org.uk>
Date:	Fri, 26 Dec 2014 17:57:44 -0500
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Suresh Siddha <sbsiddha@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Anvin <hpa@...ux.intel.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: frequent lockups in 3.18rc4

On Fri, Dec 26, 2014 at 12:57:07PM -0800, Linus Torvalds wrote:
 
 > I have a newer version of the patch that gets rid of the false
 > positives with some ordering rules instead, and just for you I hacked
 > it up to say where the problem happens too, but it's likely too late.

hm.


[ 2733.047100] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 2733.047188] 	Tasks blocked on level-0 rcu_node (CPUs 0-7): P25811
[ 2733.047216] 	Tasks blocked on level-0 rcu_node (CPUs 0-7): P25811
[ 2733.047242] 	(detected by 0, t=6502 jiffies, g=52141, c=52140, q=0)
[ 2733.047271] trinity-c406    R  running task    13416 25811  24907 0x00000000
[ 2733.047305]  ffff88022208fd28 0000000000000002 ffffffffa819f627 ffff8801df2c0000
[ 2733.047341]  00000000001d31c0 0000000000000002 ffff88022208ffd8 00000000001d31c0
[ 2733.047375]  ffff8800806e1780 ffff8801df2c0000 ffff88022208fd18 ffff88022208ffd8
[ 2733.047411] Call Trace:
[ 2733.047429]  [<ffffffffa819f627>] ? context_tracking_user_exit+0x67/0x280
[ 2733.047457]  [<ffffffffa88522a2>] preempt_schedule_irq+0x52/0xb0
[ 2733.047482]  [<ffffffffa8859820>] retint_kernel+0x20/0x30
[ 2733.047505]  [<ffffffffa808a361>] ? check_kill_permission+0xb1/0x1e0
[ 2733.047531]  [<ffffffffa808a402>] ? check_kill_permission+0x152/0x1e0
[ 2733.047557]  [<ffffffffa808dc25>] group_send_sig_info+0x65/0x150
[ 2733.047581]  [<ffffffffa808dbc5>] ? group_send_sig_info+0x5/0x150
[ 2733.047607]  [<ffffffffa80ed71e>] ? rcu_read_lock_held+0x6e/0x80
[ 2733.047632]  [<ffffffffa808dee8>] kill_pid_info+0x78/0x130
[ 2733.047654]  [<ffffffffa808de75>] ? kill_pid_info+0x5/0x130
[ 2733.047677]  [<ffffffffa808e0b2>] SYSC_kill+0xf2/0x2f0
[ 2733.047699]  [<ffffffffa808e05b>] ? SYSC_kill+0x9b/0x2f0
[ 2733.047721]  [<ffffffffa80d7ffd>] ? trace_hardirqs_on+0xd/0x10
[ 2733.047745]  [<ffffffffa8013765>] ? syscall_trace_enter_phase1+0x125/0x1a0
[ 2733.048607]  [<ffffffffa80d7f2d>] ? trace_hardirqs_on_caller+0x10d/0x1d0
[ 2733.049469]  [<ffffffffa809079e>] SyS_kill+0xe/0x10
[ 2733.050332]  [<ffffffffa8858aa2>] system_call_fastpath+0x12/0x17
[ 2733.051197] trinity-c406    R  running task    13416 25811  24907 0x00000000
[ 2733.052064]  ffff88022208fd28 0000000000000002 ffffffffa819f627 ffff8801df2c0000
[ 2733.052932]  00000000001d31c0 0000000000000002 ffff88022208ffd8 00000000001d31c0
[ 2733.053792]  ffff880209e2c680 ffff8801df2c0000 ffff88022208fd18 ffff88022208ffd8
[ 2733.054651] Call Trace:
[ 2733.055500]  [<ffffffffa819f627>] ? context_tracking_user_exit+0x67/0x280
[ 2733.056362]  [<ffffffffa88522a2>] preempt_schedule_irq+0x52/0xb0
[ 2733.057222]  [<ffffffffa8859820>] retint_kernel+0x20/0x30
[ 2733.058076]  [<ffffffffa808a361>] ? check_kill_permission+0xb1/0x1e0
[ 2733.058930]  [<ffffffffa808a402>] ? check_kill_permission+0x152/0x1e0
[ 2733.059778]  [<ffffffffa808dc25>] group_send_sig_info+0x65/0x150
[ 2733.060624]  [<ffffffffa808dbc5>] ? group_send_sig_info+0x5/0x150
[ 2733.061472]  [<ffffffffa80ed71e>] ? rcu_read_lock_held+0x6e/0x80
[ 2733.062322]  [<ffffffffa808dee8>] kill_pid_info+0x78/0x130
[ 2733.063168]  [<ffffffffa808de75>] ? kill_pid_info+0x5/0x130
[ 2733.064015]  [<ffffffffa808e0b2>] SYSC_kill+0xf2/0x2f0
[ 2733.064863]  [<ffffffffa808e05b>] ? SYSC_kill+0x9b/0x2f0
[ 2733.065704]  [<ffffffffa80d7ffd>] ? trace_hardirqs_on+0xd/0x10
[ 2733.066541]  [<ffffffffa8013765>] ? syscall_trace_enter_phase1+0x125/0x1a0
[ 2733.067384]  [<ffffffffa80d7f2d>] ? trace_hardirqs_on_caller+0x10d/0x1d0
[ 2733.068217]  [<ffffffffa809079e>] SyS_kill+0xe/0x10
[ 2733.069045]  [<ffffffffa8858aa2>] system_call_fastpath+0x12/0x17
[ 3708.217920] perf interrupt took too long (2503 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[ 4583.530580] request_module: runaway loop modprobe personality-87


still running though..

	Dave

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