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Date: Wed, 26 Mar 2014 22:26:46 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Fabian Frederick <fabf@...net.be>
Cc: linux-kernel@...r.kernel.org
Subject: [ufs] WARNING: CPU: 0 PID: 483 at kernel/locking/mutex-debug.c:117
mutex_destroy()
Greetings,
I got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit c7d2e322dd6eac1e3b44d2ea13f9818ad0f903de
Author: Fabian Frederick <fabf@...net.be>
AuthorDate: Sat Mar 22 12:49:51 2014 +1100
Commit: Stephen Rothwell <sfr@...b.auug.org.au>
CommitDate: Mon Mar 24 17:32:07 2014 +1100
ufs: sb mutex merge + mutex_destroy
788257d6101d9 ("ufs: remove the BKL") replaced BKL with mutex protection
using functions lock_ufs, unlock_ufs and struct mutex 'mutex' in sb_info.
b6963327e052 ("ufs: drop lock/unlock super") removed lock/unlock super and
added struct mutex 's_lock' in sb_info.
Those 2 mutexes are generally locked/unlocked at the same time except in
allocation (balloc, ialloc).
This patch merges the 2 mutexes and propagates first commit solution. It
also adds mutex destruction before kfree during ufs_fill_super failure and
ufs_put_super.
Signed-off-by: Fabian Frederick <fabf@...net.be>
Cc: Evgeniy Dushistov <dushistov@...l.ru>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
+-----------------------------------------------------------------+------------+---------------+
| | c7d2e322dd | next-20140324 |
+-----------------------------------------------------------------+------------+---------------+
| boot_successes | 31 | 4 |
| boot_failures | 26 | 15 |
| WARNING:CPU:PID:at_kernel/locking/mutex-debug.c:mutex_destroy() | 26 | 15 |
| INFO:rcu_preempt_detected_stalls_on_CPUs/tasks | 25 | 15 |
| INFO:task_blocked_for_more_than_seconds | 26 | 15 |
| RIP:flat_send_IPI_mask | 26 | 15 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 26 | 15 |
| backtrace:do_mount | 26 | 15 |
| backtrace:SyS_mount | 26 | 15 |
| backtrace:user_path_create | 25 | 15 |
| backtrace:SyS_mknodat | 25 | 15 |
| backtrace:SyS_mknod | 25 | 15 |
| backtrace:watchdog | 26 | 15 |
| backtrace:work_fn | 1 | |
+-----------------------------------------------------------------+------------+---------------+
[ 7.661278] UFSD (fs/ufs/super.c, 1264): ufs_fill_super:
[ 7.664618] ufs was compiled with read-only support, can't be mounted as read-write
[ 7.667790] UFSD (fs/ufs/super.c, 1264): ufs_fill_super:
[ 7.670703] WARNING: CPU: 0 PID: 483 at kernel/locking/mutex-debug.c:117 mutex_destroy+0x4c/0x65()
[ 7.674108] ufs was compiled with read-only support, can't be mounted as read-write
[ 7.676652] flag 0
[ 7.677363] ufs was compiled with read-only support, can't be mounted as read-write
git bisect start 098bc161bfc7697f7e2ca15400f13ca1ac60e9dd 9b28ec4b41883a83c3b0960e61739162443c5bba --
git bisect bad 46a1de3d4918d4210affec733d665fd0ff2391e3 # 20:06 15- 4 Merge branch 'akpm/master'
git bisect good c51fabb1e3b203382616ca21f7cf4e7b0912d50e # 20:20 57+ 1 Revert "vmstat: use raw_cpu_ops to avoid false positives on preemption checks"
git bisect good bc82fcdfe572cea8d21ad97f1fab2d8cf3d412bc # 20:45 57+ 0 net: replace __this_cpu_inc in route.c with raw_cpu_inc
git bisect good 855370bf10fd8eb8877e197b6cbcd0262a9b34b7 # 21:04 57+ 0 arm64: initialize pgprot info earlier in boot
git bisect good a5a8c89e515b8617f232d1a3375a086c4bfcae24 # 21:28 57+ 0 fs/ufs: remove unused ufs_super_block_second pointer
git bisect bad c7d2e322dd6eac1e3b44d2ea13f9818ad0f903de # 21:48 22- 5 ufs: sb mutex merge + mutex_destroy
git bisect good e68aadb9f813be874722b4ef1e84b32557688364 # 22:11 57+ 0 fs/ufs: remove unused ufs_super_block_third pointer
# first bad commit: [c7d2e322dd6eac1e3b44d2ea13f9818ad0f903de] ufs: sb mutex merge + mutex_destroy
git bisect good e68aadb9f813be874722b4ef1e84b32557688364 # 22:21 171+ 0 fs/ufs: remove unused ufs_super_block_third pointer
git bisect bad 098bc161bfc7697f7e2ca15400f13ca1ac60e9dd # 22:21 0- 15 Add linux-next specific files for 20140324
git bisect good b098d6726bbfb94c06d6e1097466187afddae61f # 23:12 171+ 2 Linux 3.14-rc8
git bisect bad 2ec6ab7445b659589abf5b9cf6c087c420d439bd # 23:22 50- 1 Add linux-next specific files for 20140325
This script may reproduce the error.
-----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=yocto-minimal-x86_64.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/blob/master/initrd/$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,
Fengguang
View attachment "dmesg-yocto-ivytown2-39:20140325215015:x86_64-randconfig-r3-03251014:3.14.0-rc7-11620-gc7d2e32:1" of type "text/plain" (111072 bytes)
Download attachment "x86_64-randconfig-r3-03251014-098bc161bfc7697f7e2ca15400f13ca1ac60e9dd-WARNING:---at----mutex_destroy+-x-77588.log" of type "application/octet-stream" (23081 bytes)
View attachment "config-3.14.0-rc7-11620-gc7d2e32" of type "text/plain" (88543 bytes)
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