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Date: Mon, 23 Jun 2014 16:20:39 +0800
From: Jet Chen <jet.chen@...el.com>
To: Viresh Kumar <viresh.kumar@...aro.org>
CC: Fengguang Wu <fengguang.wu@...el.com>, LKP <lkp@...org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [clockevents] WARNING: CPU: 0 PID: 0 at kernel/time/tick-oneshot.c:32
tick_stop_event()
Hi Viresh,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.linaro.org/people/vireshk/linux tick/ONESHOT-STOPPED
commit d5a085970b0b88b8c82303d2c45f09c9427fd02a
Author: Viresh Kumar <viresh.kumar@...aro.org>
AuthorDate: Tue Jun 10 13:52:25 2014 +0530
Commit: Viresh Kumar <viresh.kumar@...aro.org>
CommitDate: Thu Jun 19 10:35:12 2014 +0530
clockevents: x86: add support for ONESHOT_STOPPED mode
Clockevent devices can be stopped from core (hrtimers/tick) when they aren't
used anymore. This will mostly happen on a idle or tickless cpu. This is done to
avoid getting spurious interrupts when core doesn't want to handle them anymore.
For stopping clockevent devices, core requests drivers to switch to a special
optional mode: CLOCK_EVT_MODE_ONESHOT_STOPPED. At this time platforms can also
save some power by disabling these devices.
This patch adds support for handling CLOCK_EVT_MODE_ONESHOT_STOPPED mode for x86
drivers.
Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
+-----------------------------------------------------------------+------------+------------+
| | f4f5df6f14 | d5a085970b |
+-----------------------------------------------------------------+------------+------------+
| boot_successes | 120 | 9 |
| boot_failures | 0 | 31 |
| WARNING:CPU:PID:at_kernel/time/tick-oneshot.c:tick_stop_event() | 0 | 31 |
| backtrace:cpu_startup_entry | 0 | 19 |
+-----------------------------------------------------------------+------------+------------+
[ 0.247455] WARNING: CPU: 0 PID: 0 at kernel/time/tick-oneshot.c:32 tick_stop_event+0x43/0x50()
[ 0.247455] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.16.0-rc1-00016-gd5a0859 #1
[ 0.247455] 0000000000000009 ffff880012203eb0 ffffffff81658a72 0000000000000000
[ 0.247455] ffff880012203ee8 ffffffff8108c128 ffff88001220ca80 7fffffffffffffff
[ 0.247455] 000000000e82ddd2 7fffffffffffffff ffff8800123cd560 ffff880012203ef8
[ 0.247455] Call Trace:
[ 0.247455] <IRQ> [<ffffffff81658a72>] dump_stack+0x4d/0x66
[ 0.247455] [<ffffffff8108c128>] warn_slowpath_common+0x78/0xa0
[ 0.247455] [<ffffffff8108c23a>] warn_slowpath_null+0x1a/0x20
[ 0.247455] [<ffffffff81101983>] tick_stop_event+0x43/0x50
[ 0.247455] [<ffffffff81102275>] __tick_nohz_idle_enter+0x515/0x580
[ 0.247455] [<ffffffff81102649>] ? tick_nohz_irq_exit+0x29/0x30
[ 0.247455] [<ffffffff81102649>] tick_nohz_irq_exit+0x29/0x30
[ 0.247455] [<ffffffff810913c5>] irq_exit+0xb5/0xd0
[ 0.247455] [<ffffffff81028095>] smp_call_function_single_interrupt+0x35/0x40
[ 0.247455] [<ffffffff81662892>] call_function_single_interrupt+0x72/0x80
[ 0.247455] <EOI> [<ffffffff81032b96>] ? native_safe_halt+0x6/0x10
[ 0.247455] [<ffffffff8100c964>] default_idle+0x24/0xe0
[ 0.247455] [<ffffffff8100d3cf>] arch_cpu_idle+0xf/0x20
[ 0.247455] [<ffffffff810d4f16>] cpu_startup_entry+0x386/0x4f0
[ 0.247455] [<ffffffff81652da6>] rest_init+0xc6/0xd0
[ 0.247455] [<ffffffff81652ce5>] ? rest_init+0x5/0xd0
[ 0.247455] [<ffffffff81f23f96>] start_kernel+0x41e/0x429
[ 0.247455] [<ffffffff81f23981>] ? set_init_arg+0x53/0x53
[ 0.247455] [<ffffffff81f23120>] ? early_idt_handlers+0x120/0x120
[ 0.247455] [<ffffffff81f23549>] x86_64_start_reservations+0x2a/0x2c
[ 0.247455] [<ffffffff81f23679>] x86_64_start_kernel+0x12e/0x13d
git bisect start 1ded43568e7bee60c6548e5fb3b4bd6d1d0783b1 a497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee --
git bisect good 5f069b44108f255ab9a881ff366c793bc1cda5e9 # 14:27 21+ 0 Merge 'ipvs-next/master' into devel-hourly-2014062313
git bisect good 70eab242a357abfe990c30656a396f1b0a0ba465 # 14:33 21+ 0 Merge 'cifs/for-next' into devel-hourly-2014062313
git bisect good 64550da9a486e3766b85928f442756f29c39437a # 14:40 21+ 0 Merge 'rcu/rcu_cond_resched.2014.06.20c' into devel-hourly-2014062313
git bisect bad bf774a68a67dd0c0f938258f56346763d619bdbf # 14:44 0- 6 Merge 'vireshk/tick/lowres-go-tickless' into devel-hourly-2014062313
git bisect bad b1efa076fdd9532ba3fdf0bddb475ed968f33c13 # 14:50 2- 1 Merge 'vireshk/tick/ONESHOT-STOPPED' into devel-hourly-2014062313
git bisect good f935474b892829a400f31ec076385b792034a32e # 15:02 40+ 0 clockevents: Introduce CLOCK_EVT_MODE_ONESHOT_STOPPED mode
git bisect good f4f5df6f142f6797c9aae44d8b570843544dcca9 # 15:12 40+ 0 clockevents: mips: add support for ONESHOT_STOPPED mode
git bisect bad 2d74fb379fa8c9d388fcce15e84772713ac7331d # 15:16 5- 8 clockevents: misc: add support for ONESHOT_STOPPED mode
git bisect bad 6e9ed902730ca7f5cde9fcf47c6b1ca2a143babf # 15:33 1- 14 clockevents: drivers: add support for ONESHOT_STOPPED mode
git bisect bad d5a085970b0b88b8c82303d2c45f09c9427fd02a # 15:43 1- 2 clockevents: x86: add support for ONESHOT_STOPPED mode
# first bad commit: [d5a085970b0b88b8c82303d2c45f09c9427fd02a] clockevents: x86: add support for ONESHOT_STOPPED mode
git bisect good f4f5df6f142f6797c9aae44d8b570843544dcca9 # 15:46 120+ 0 clockevents: mips: add support for ONESHOT_STOPPED mode
git bisect bad 1ded43568e7bee60c6548e5fb3b4bd6d1d0783b1 # 15:46 0- 11 0day head guard for 'devel-hourly-2014062313'
git bisect good a497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee # 15:49 120+ 0 Linux 3.16-rc2
git bisect good 58ae500a03a6bf68eee323c342431bfdd3f460b6 # 15:56 120+ 0 Add linux-next specific files for 20140623
This script may reproduce the error.
-----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=yocto-minimal-i386.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$initrd
kvm=(
qemu-system-x86_64 -cpu kvm64 -enable-kvm
-kernel $kernel
-initrd $initrd
-smp 2
-m 256M
-net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio
-net user,vlan=0
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-serial stdio
-display none
-monitor null
)
append=(
debug
sched_debug
apic=debug
ignore_loglevel
sysrq_always_enabled
panic=10
prompt_ramdisk=0
earlyprintk=ttyS0,115200
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
)
"${kvm[@]}" --append "${append[*]}"
-----------------------------------------------------------------------------
Thanks,
Jet
Download attachment "i386-randconfig-c1-06231331-1ded43568e7bee60c6548e5fb3b4bd6d1d0783b1-WARNING:---at----tick_stop_event+-x-86334.log" of type "application/octet-stream" (25834 bytes)
View attachment "config-3.16.0-rc1-00016-gd5a0859" of type "text/plain" (102273 bytes)
View attachment "Attached Message Part" of type "text/plain" (86 bytes)
View attachment "dmesg-quantal-ivb42-99:20140623144723:x86_64-randconfig-hsxa1-06231401:3.16.0-rc1-00016-gd5a0859:1" of type "text/plain" (58465 bytes)
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