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Date:	Sat, 14 Jun 2014 00:04:07 +0800
From:	Jet Chen <jet.chen@...el.com>
To:	Hong Zhiguo <zhiguohong@...cent.com>
CC:	Jens Axboe <axboe@...nel.dk>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Yuanhan Liu <yuanhan.liu@...el.com>, lkp@...org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [block] WARNING: CPU: 0 PID: 99 at kernel/softirq.c:156 local_bh_enable()

Hi Zhiguo,

0day kernel testing robot got the below dmesg and the first bad commit is

git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit 2c575026fae6e63771bd2a4c1d407214a8096a89
Author:     Hong Zhiguo <zhiguohong@...cent.com>
AuthorDate: Wed Nov 20 10:35:05 2013 -0700
Commit:     Jens Axboe <axboe@...nel.dk>
CommitDate: Wed Nov 20 15:33:04 2013 -0700

    Update of blkg_stat and blkg_rwstat may happen in bh context.
    While u64_stats_fetch_retry is only preempt_disable on 32bit
    UP system. This is not enough to avoid preemption by bh and
    may read strange 64 bit value.
        Signed-off-by: Hong Zhiguo <zhiguohong@...cent.com>
    Acked-by: Tejun Heo <tj@...nel.org>
    Cc: stable@...nel.org
    Signed-off-by: Jens Axboe <axboe@...nel.dk>


+-------------------------------------------------------+------------+------------+
|                                                       | 82023bb7f7 | 2c575026fa |
+-------------------------------------------------------+------------+------------+
| boot_successes                                        | 794        | 183        |
| boot_failures                                         | 106        | 117        |
| BUG:kernel_test_crashed                               | 33         |            |
| BUG:kernel_boot_hang                                  | 73         | 91         |
| WARNING:CPU:PID:at_kernel/softirq.c:local_bh_enable() | 0          | 117        |
| inconsistent_SOFTIRQ-ON-W-IN-SOFTIRQ-W_usage          | 0          | 117        |
| backtrace:do_mount                                    | 0          | 85         |
| backtrace:SyS_mount                                   | 0          | 85         |
| backtrace:redo_fd_request                             | 0          | 117        |
| backtrace:floppy_work_workfn                          | 0          | 0          |
| backtrace:fd_timer_workfn                             | 0          | 0          |
+-------------------------------------------------------+------------+------------+

[  414.461526] power_supply test_battery: prop TEMP=26
[  414.871358] power_supply test_battery: prop VOLTAGE_NOW=3300
[  416.112247] ------------[ cut here ]------------
[  416.113048] WARNING: CPU: 0 PID: 99 at kernel/softirq.c:156 local_bh_enable+0x39/0xc0()
[  416.113048] CPU: 0 PID: 99 Comm: kworker/u2:1 Not tainted 3.12.0-10276-g2c57502 #1
[  416.113048] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  416.113048] Workqueue: floppy redo_fd_request
[  416.113048]  00000000 00000000 d1599c7c c13f3d3f d1599cac c023551b c1990f08 00000000
[  416.113048]  00000063 c1991108 0000009c c0239219 c0239219 c060f801 d1661a14 d1660000
[  416.113048]  d1599cbc c02355dd 00000009 00000000 d1599cc8 c0239219 d1599cf0 d1599cd8
[  416.113048] Call Trace:
[  416.113048]  [<c13f3d3f>] dump_stack+0x16/0x18
[  416.113048]  [<c023551b>] warn_slowpath_common+0x6b/0x90
[  416.113048]  [<c0239219>] ? local_bh_enable+0x39/0xc0
[  416.113048]  [<c0239219>] ? local_bh_enable+0x39/0xc0
[  416.113048]  [<c060f801>] ? blkg_rwstat_read+0x41/0x50
[  416.113048]  [<c02355dd>] warn_slowpath_null+0x1d/0x20
[  416.113048]  [<c0239219>] local_bh_enable+0x39/0xc0
[  416.113048]  [<c060f801>] blkg_rwstat_read+0x41/0x50
[  416.113048]  [<c0611b65>] __cfq_set_active_queue+0x75/0x180
[  416.113048]  [<c0220ab3>] ? kvm_clock_read+0x13/0x20
[  416.113048]  [<c0207738>] ? sched_clock+0x8/0x10
[  416.113048]  [<c025b8b5>] ? sched_clock_local.constprop.2+0x15/0x150
[  416.113048]  [<c06132f3>] cfq_dispatch_requests+0x613/0x990
[  416.113048]  [<c0220ab3>] ? kvm_clock_read+0x13/0x20
[  416.113048]  [<c0207738>] ? sched_clock+0x8/0x10
[  416.113048]  [<c025b8b5>] ? sched_clock_local.constprop.2+0x15/0x150
[  416.113048]  [<c08bceff>] ? redo_fd_request+0x3f/0x1010
[  416.113048]  [<c05f7e1e>] blk_peek_request+0x17e/0x1b0
[  416.113048]  [<c140945d>] ? _raw_spin_lock_irq+0x6d/0x80
[  416.113048]  [<c05f7e59>] blk_fetch_request+0x9/0x20
[  416.113048]  [<c08bcf45>] redo_fd_request+0x85/0x1010
[  416.113048]  [<c024a1e0>] ? process_one_work+0x1c0/0x3d0
[  416.113048]  [<c024a24a>] process_one_work+0x22a/0x3d0
[  416.113048]  [<c024a1e0>] ? process_one_work+0x1c0/0x3d0
[  416.113048]  [<c024a5bf>] worker_thread+0x1cf/0x330
[  416.113048]  [<c024a3f0>] ? process_one_work+0x3d0/0x3d0
[  416.113048]  [<c025108a>] kthread+0xaa/0xb0
[  416.113048]  [<c140a637>] ret_from_kernel_thread+0x1b/0x28
[  416.113048]  [<c0250fe0>] ? __kthread_unpark+0x40/0x40
[  416.113048] ---[ end trace 053edd2998e0f96b ]---
[  438.998238] block nbd12: Attempted send on closed socket


git bisect start v3.13 v3.12 --
git bisect good 3bad8bb5cd3048a67df43ac6b1e2f191f19d9ff0  # 12:35    300+     46  Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
git bisect  bad dd0508093b79141e0044ca02f0acb6319f69f546  # 12:49     41-      1  Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect  bad 3f02ff5c2c69753666787ed125708d283a823ffb  # 13:07     93-      2  Merge tag 'tty-3.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
git bisect good 1ab231b274ba51a54acebec23c6aded0f3cdf54e  # 13:31    300+     30  Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect  bad 5ee540613db504a10e15fafaf4c08cac96aa1823  # 13:50     66-      5  Merge branch 'for-linus' of git://git.kernel.dk/linux-block
git bisect good 53c6de50262a8edd6932bb59a32db7b9d92f8d67  # 14:26    300+      6  Merge branch 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 59fb2f0e9e30ad99a8bab0ff1efaf8f4a3b7105f  # 14:50    300+     57  Merge tag 'fbdev-fixes-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux
git bisect good ef1e4e32d595d3e6c9a6d3d2956f087d5886c5e5  # 15:17    300+     32  Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
git bisect good 29be6345bbaec8502a70c4e2204d5818b48c4e8f  # 19:00    300+     40  Merge tag 'nfs-for-3.13-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs
git bisect  bad e345d767f6530ec9cb0aabab7ea248072a9c6975  # 19:17    131-      8  Merge branch 'stable/for-jens-3.13-take-two' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip into for-linus
git bisect  bad c170bbb45febc03ac4d34ba2b8bb55e06104b7e7  # 19:33     15-      2  block: submit_bio_wait() conversions
git bisect  bad 2c575026fae6e63771bd2a4c1d407214a8096a89  # 19:57     41-      2  Update of blkg_stat and blkg_rwstat may happen in bh context. While u64_stats_fetch_retry is only preempt_disable on 32bit UP system. This is not enough to avoid preemption by bh and may read strange 64 bit value.
# first bad commit: [2c575026fae6e63771bd2a4c1d407214a8096a89] Update of blkg_stat and blkg_rwstat may happen in bh context. While u64_stats_fetch_retry is only preempt_disable on 32bit UP system. This is not enough to avoid preemption by bh and may read strange 64 bit value.
git bisect good 82023bb7f75b0052f40d3e74169d191c3e4e6286  # 20:59    900+    106  Merge tag 'pm+acpi-2-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect  bad b1cce620fd4b6864c92e7307be7839789f9c8be0  # 20:59      0-      5  Add linux-next specific files for 20140612
git bisect  bad 6d87c225f5d82d29243dc124f1ffcbb0e14ec358  # 21:29     89-      6  Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client
git bisect  bad f9801c532e045c1ab89801d0597353c5e2a55671  # 21:58    113-      8  Add linux-next specific files for 20140613


This script may reproduce the error.

-----------------------------------------------------------------------------
#!/bin/bash

kernel=$1

kvm=(
	qemu-system-x86_64 -cpu kvm64 -enable-kvm
 	-kernel $kernel
	-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


View attachment "dmesg-yocto-ivb42-41:20140613200222:i386-randconfig-tt0-06131036:3.12.0-10276-g2c57502:1" of type "text/plain" (62011 bytes)

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