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Date: Mon, 11 Feb 2013 16:56:00 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Chuansheng Liu <chuansheng.liu@...el.com>
Cc: netdev <netdev@...r.kernel.org>, Ingo Molnar <mingo@...nel.org>,
linux-kernel@...r.kernel.org
Subject: [flow_cache_new_hashrnd] WARNING: at kernel/smp.c:328
smp_call_function_single()
Greetings,
I got the below oops and the first bad commit is
commit b29f39c7c3e75a741a7da88244ec707f293ec04c
Author: Chuansheng Liu <chuansheng.liu@...el.com>
Date: Wed Feb 6 23:18:21 2013 +0800
smp: Give WARN()ing if in_interrupt() when calling smp_call_function_many()/single()
Currently the functions smp_call_function_many()/single() will
give a WARN()ing only in the case of irqs_disabled(), but that
check is not enough to guarantee execution of the SMP
cross-calls.
In many other cases such as softirq handling/interrupt handling,
the two APIs still can not be called, just as the
smp_call_function_many() comments say:
* You must not call this function with disabled interrupts or from a
* hardware interrupt handler or from a bottom half handler. Preemption
* must be disabled when calling this function.
There is a real case for softirq DEADLOCK case:
CPUA CPUB
spin_lock(&spinlock)
Any irq coming, call the irq handler
irq_exit()
spin_lock_irq(&spinlock)
<== Blocking here due to
CPUB hold it
__do_softirq()
run_timer_softirq()
timer_cb()
call smp_call_function_many()
send IPI interrupt to CPUA
wait_csd()
Then both CPUA and CPUB will be deadlocked here.
So we should give a warning in the in_interrupt() case as well.
Signed-off-by: liu chuansheng <chuansheng.liu@...el.com>
Cc: jun.zhang@...el.com
Cc: peterz@...radead.org
Cc: jbeulich@...e.com
Cc: paulmck@...ux.vnet.ibm.com
Cc: mina86@...a86.org
Cc: srivatsa.bhat@...ux.vnet.ibm.com
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1360163901.24670.13.camel@cliu38-desktop-build
Signed-off-by: Ingo Molnar <mingo@...nel.org>
[ 222.203606] nfsd: last server has exited, flushing export cache
[ 229.330068] ------------[ cut here ]------------
[ 229.331757] WARNING: at /c/kernel-tests/src/stable/kernel/smp.c:328 smp_call_function_single+0xbd/0x1c7()
[ 229.335003] Hardware name: Bochs
[ 229.336378] Modules linked in:
[ 229.337825] Pid: 6740, comm: reboot Not tainted 3.8.0-rc6-00548-gc479495 #40
[ 229.339945] Call Trace:
[ 229.341176] [<ffffffff810353b4>] warn_slowpath_common+0x83/0x9c
[ 229.343091] [<ffffffff817089d6>] ? flow_cache_new_hashrnd+0x98/0x98
[ 229.345105] [<ffffffff810353e7>] warn_slowpath_null+0x1a/0x1c
[ 229.346978] [<ffffffff81090793>] smp_call_function_single+0xbd/0x1c7
[ 229.349017] [<ffffffff81090afe>] smp_call_function_many+0x121/0x23e
[ 229.350996] [<ffffffff817089d6>] ? flow_cache_new_hashrnd+0x98/0x98
[ 229.353005] [<ffffffff81090e09>] smp_call_function+0x37/0x40
[ 229.354860] [<ffffffff8170907e>] flow_cache_flush+0x72/0xa0
[ 229.356735] [<ffffffff81759e33>] xfrm_dev_event+0x14/0x20
[ 229.358545] [<ffffffff817ff8b0>] notifier_call_chain+0x65/0x95
[ 229.360469] [<ffffffff8105ce16>] __raw_notifier_call_chain+0xe/0x10
[ 229.362453] [<ffffffff8105ce2c>] raw_notifier_call_chain+0x14/0x16
[ 229.364453] [<ffffffff816f63d6>] call_netdevice_notifiers+0x4a/0x4f
[ 229.366434] [<ffffffff816fa2ab>] __dev_notify_flags+0x37/0x5b
[ 229.368342] [<ffffffff816fa318>] dev_change_flags+0x49/0x54
[ 229.370184] [<ffffffff8174574a>] devinet_ioctl+0x24f/0x542
[ 229.372036] [<ffffffff81746975>] inet_ioctl+0x97/0xb1
[ 229.373774] [<ffffffff816e5042>] sock_do_ioctl.constprop.42+0x18/0x37
[ 229.375791] [<ffffffff816e5480>] sock_ioctl+0x1fd/0x20a
[ 229.377648] [<ffffffff810bb9cd>] ? trace_buffer_lock_reserve+0x41/0x56
[ 229.379701] [<ffffffff8112b7c6>] vfs_ioctl+0x26/0x39
[ 229.381459] [<ffffffff8112c0d2>] do_vfs_ioctl+0x41b/0x45e
[ 229.383269] [<ffffffff8100bc3a>] ? ftrace_raw_event_sys_enter+0x10b/0x11a
[ 229.385404] [<ffffffff817fc118>] ? retint_swapgs+0x13/0x1b
[ 229.387227] [<ffffffff8112c15a>] sys_ioctl+0x45/0x73
[ 229.388975] [<ffffffff818034be>] tracesys+0xd0/0xd5
[ 229.390665] ---[ end trace c47a5dd12e99cb04 ]---
git bisect start c4794952da9f0395101682925a4117d0a6a01ae5 1589a3e7777631ff56dd58cd7dcdf275185e62b5 --
git bisect good 89bb67ff935d461544fed87174bb13dcc4bac673 # 11 2013-02-08 17:23:50 perf tools: Fix perf_evsel::exclude_GH handling
git bisect good cacafec82e2dbbfbeb5c86c1f31ff17d0983b11b # 10 2013-02-08 21:24:30 arch/mips/jazz: remove depends on CONFIG_EXPERIMENTAL
git bisect good 42f0e2b23ea9c97e276b32e7a7849bed37e5c47f # 18 2013-02-09 01:25:42 final removal of CONFIG_EXPERIMENTAL
git bisect bad 9197b357ed90fb43488a67b30a6d7cf7edce34c9 # 0 2013-02-09 02:46:24 Merge remote-tracking branch 'kees/devtmpfs-safe' into devel-bee-x86_64-2013-02-07-05-59
git bisect bad a31151b33053ee9c2f91d53f2f8b8b1f36c00115 # 0 2013-02-09 02:49:49 Merge branch 'core/urgent' into core/locking
git bisect good 0ebd64ee0f225028c5a97581cdfeeb15931ec35c # 16 2013-02-09 05:33:05 liblockdep: Add public headers for pthread_mutex_t implementation
git bisect good 3279bccc7ff663ef1ccd8b9e8d4ac197c0e041e7 # 13 2013-02-09 09:33:45 liblockdep: Add a MAINTAINERS entry
git bisect bad b29f39c7c3e75a741a7da88244ec707f293ec04c # 0 2013-02-09 10:55:01 smp: Give WARN()ing if in_interrupt() when calling smp_call_function_many()/single()
git bisect good b2e7c77a379071318b2a9c9e500e3b8b47084391 # 11 2013-02-09 13:36:55 perf: Integrate liblockdep support into perf
git bisect good b2e7c77a379071318b2a9c9e500e3b8b47084391 # 34 2013-02-09 17:38:01 perf: Integrate liblockdep support into perf
git bisect good 1587f71ebbf5aedf754062baa11fcc9e9b49ecf0 # 33 2013-02-10 00:19:24 Add linux-next specific files for 20130125
Thanks,
Fengguang
View attachment "dmesg-kvm-bens-3400-2013-02-07-06-10-08-3.8.0-rc6-00548-gc479495-40" of type "text/plain" (54413 bytes)
View attachment "c479495-bisect.log" of type "text/plain" (12502 bytes)
View attachment ".config-bisect" of type "text/plain" (78682 bytes)
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