From: Michael Ellerman <michael@ellerman.id.au>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: Regression in RCU subsystem in latest mainline kernel
Date: Tue, 25 Jun 2013 17:44:23 +1000 [thread overview]
Message-ID: <20130625074422.GB29957@concordia> (raw)
In-Reply-To: <20130625071914.GA29957@concordia>
On Tue, Jun 25, 2013 at 05:19:14PM +1000, Michael Ellerman wrote:
>
> Here's another trace from 3.10-rc7 plus a few local patches.
And here's another with CONFIG_RCU_CPU_STALL_INFO=y in case that's useful:
PASS running test_pmc5_6_overuse()
INFO: rcu_sched self-detected stall on CPU
8: (1 GPs behind) idle=8eb/140000000000002/0 softirq=215/220
(t=2100 jiffies g=18446744073709551583 c=18446744073709551582 q=13)
cpu 0x8: Vector: 0 at [c0000003ea03eae0]
pc: c00000000011d9b0: .rcu_check_callbacks+0x450/0x910
lr: c00000000011d9b0: .rcu_check_callbacks+0x450/0x910
sp: c0000003ea03ec40
msr: 9000000000009032
current = 0xc0000003ebf9f4a0
paca = 0xc00000000fdc2400 softe: 0 irq_happened: 0x00
pid = 2444, comm = power8-events
enter ? for help
[c0000003ea03ed70] c000000000094cd0 .update_process_times+0x40/0x90
[c0000003ea03ee00] c0000000000df050 .tick_sched_handle.isra.13+0x20/0xa0
[c0000003ea03ee80] c0000000000df2bc .tick_sched_timer+0x5c/0xa0
[c0000003ea03ef20] c0000000000b3728 .__run_hrtimer+0x98/0x260
[c0000003ea03efc0] c0000000000b4738 .hrtimer_interrupt+0x138/0x3c0
[c0000003ea03f0d0] c00000000001cd34 .timer_interrupt+0x124/0x2f0
[c0000003ea03f180] c00000000000a4f4 restore_check_irq_replay+0x68/0xa8
--- Exception: 901 (Decrementer) at c000000000093ad4 .run_timer_softirq+0x74/0x360
[c0000003ea03f580] c000000000089ac4 .__do_softirq+0x174/0x350
[c0000003ea03f6a0] c000000000089ea8 .irq_exit+0xb8/0x100
[c0000003ea03f720] c00000000001cd68 .timer_interrupt+0x158/0x2f0
[c0000003ea03f7d0] c00000000000a4f4 restore_check_irq_replay+0x68/0xa8
--- Exception: 901 (Decrementer) at c00000000014a520 .task_function_call+0x60/0x70
[c0000003ea03fac0] c00000000014a634 .perf_event_enable+0x104/0x1c0 (unreliable)
[c0000003ea03fb70] c0000000001495ec .perf_event_for_each_child+0x5c/0xf0
[c0000003ea03fc00] c00000000014cd78 .perf_ioctl+0x108/0x400
[c0000003ea03fca0] c0000000001d9aa0 .do_vfs_ioctl+0xb0/0x740
[c0000003ea03fd80] c0000000001da188 .SyS_ioctl+0x58/0xb0
[c0000003ea03fe30] c000000000009d54 syscall_exit+0x0/0x98
--- Exception: c01 (System Call) at 00001fffffee03d0
SP (3ffff5e7cc90) is in userspace
cheers
next prev parent reply other threads:[~2013-06-25 7:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1626500.7WAVXjfS9F@pcimr>
[not found] ` <20130614122800.GL5146@linux.vnet.ibm.com>
[not found] ` <1645938.As0LR1yeVd@pcimr>
2013-06-14 21:06 ` Regression in RCU subsystem in latest mainline kernel Steven Rostedt
2013-06-15 2:02 ` Benjamin Herrenschmidt
2013-06-15 2:17 ` Steven Rostedt
2013-06-15 2:21 ` Benjamin Herrenschmidt
2013-06-15 2:31 ` Steven Rostedt
2013-06-15 2:51 ` Paul E. McKenney
2013-06-17 13:21 ` Rojhalat Ibrahim
2013-06-17 13:51 ` Steven Rostedt
2013-06-17 7:42 ` Michael Ellerman
2013-06-19 4:09 ` Paul E. McKenney
2013-06-25 7:19 ` Michael Ellerman
2013-06-25 7:36 ` Benjamin Herrenschmidt
2013-06-25 7:44 ` Michael Ellerman [this message]
2013-06-25 16:03 ` Paul E. McKenney
2013-06-26 8:10 ` Michael Ellerman
2013-06-26 14:16 ` Paul E. McKenney
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