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Message-ID: <bug-73051-13602@https.bugzilla.kernel.org/>
Date: Thu, 27 Mar 2014 20:26:48 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 73051] New: Hung Tasks possibly related to ext4 IO
https://bugzilla.kernel.org/show_bug.cgi?id=73051
Bug ID: 73051
Summary: Hung Tasks possibly related to ext4 IO
Product: File System
Version: 2.5
Kernel Version: 3.13.6
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: ext4
Assignee: fs_ext4@...nel-bugs.osdl.org
Reporter: nik.martin@...il.com
Regression: No
When my computer is doing any task that creates a moderate amount of IO, I get
a hung task, and the call trace is always as follows. This usually force a
reboot via sysctl+REISUB. In this case I was compiling a java project in
Android Studio. I build my own kernel out of mainline stable branch:
Linux xyz-deb 3.13.6-201403190021nik-deb-dirty #4 SMP PREEMPT Wed Mar 19
00:31:09 CDT 2014 x86_64 GNU/Linux
Mar 27 14:51:18 xyz-deb kernel: [259345.574164] INFO: task
BrowserBlocking:11047 blocked for more than 120 seconds.
Mar 27 14:51:18 xyz-deb kernel: [259345.574172] Tainted: P O
3.13.6-201403190021xyz-deb-dirty #4
Mar 27 14:51:18 xyz-deb kernel: [259345.574175] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 27 14:51:18 xyz-deb kernel: [259345.574179] BrowserBlocking D
ffff8800b93acb68 0 11047 1 0x00000000
Mar 27 14:51:18 xyz-deb kernel: [259345.574187] ffff8800b93ac840
0000000000000082 0000000000000004 ffff880235cfe740
Mar 27 14:51:18 xyz-deb kernel: [259345.574193] 0000000000012dc0
ffff8801e63d3fd8 0000000000012dc0 ffff8800b93ac840
Mar 27 14:51:18 xyz-deb kernel: [259345.574199] 0000000000000000
ffff8800b93ac840 ffff88023ec93600 ffff8801e63d3da0
Mar 27 14:51:18 xyz-deb kernel: [259345.574205] Call Trace:
Mar 27 14:51:18 xyz-deb kernel: [259345.574216] [<ffffffff810fe240>] ?
__lock_page+0x80/0x80
Mar 27 14:51:18 xyz-deb kernel: [259345.574224] [<ffffffff8146aea8>] ?
io_schedule+0x88/0xe0
Mar 27 14:51:18 xyz-deb kernel: [259345.574230] [<ffffffff810fe249>] ?
sleep_on_page+0x9/0x20
Mar 27 14:51:18 xyz-deb kernel: [259345.574236] [<ffffffff8146b432>] ?
__wait_on_bit+0x52/0x80
Mar 27 14:51:18 xyz-deb kernel: [259345.574241] [<ffffffff810fe373>] ?
wait_on_page_bit+0x73/0x80
Mar 27 14:51:18 xyz-deb kernel: [259345.574248] [<ffffffff81082180>] ?
wake_atomic_t_function+0x40/0x40
Mar 27 14:51:18 xyz-deb kernel: [259345.574253] [<ffffffff810fe450>] ?
filemap_fdatawait_range+0xd0/0x160
Mar 27 14:51:18 xyz-deb kernel: [259345.574259] [<ffffffff810ff9ec>] ?
__filemap_fdatawrite_range+0x4c/0x60
Mar 27 14:51:18 xyz-deb kernel: [259345.574264] [<ffffffff810ffa39>] ?
filemap_write_and_wait_range+0x39/0x60
Mar 27 14:51:18 xyz-deb kernel: [259345.574298] [<ffffffffa00d5256>] ?
ext4_sync_file+0xb6/0x340 [ext4]
Mar 27 14:51:18 xyz-deb kernel: [259345.574305] [<ffffffff8118a068>] ?
do_fsync+0x48/0x80
Mar 27 14:51:18 xyz-deb kernel: [259345.574310] [<ffffffff8118a2ee>] ?
SyS_fdatasync+0xe/0x20
Mar 27 14:51:18 xyz-deb kernel: [259345.574317] [<ffffffff81473ce2>] ?
system_call_fastpath+0x16/0x1b
Mar 27 14:53:18 xyz-deb kernel: [259465.752466] INFO: task
BrowserBlocking:11047 blocked for more than 120 seconds.
Mar 27 14:53:18 xyz-deb kernel: [259465.752475] Tainted: P O
3.13.6-201403190021xyz-deb-dirty #4
Mar 27 14:53:18 xyz-deb kernel: [259465.752478] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 27 14:53:18 xyz-deb kernel: [259465.752482] BrowserBlocking D
ffff8800b93acb68 0 11047 1 0x00000000
Mar 27 14:53:18 xyz-deb kernel: [259465.752489] ffff8800b93ac840
0000000000000082 0000000000000004 ffff880235cfe740
Mar 27 14:53:18 xyz-deb kernel: [259465.752496] 0000000000012dc0
ffff8801e63d3fd8 0000000000012dc0 ffff8800b93ac840
Mar 27 14:53:18 xyz-deb kernel: [259465.752502] 0000000000000000
ffff8800b93ac840 ffff88023ec93600 ffff8801e63d3da0
Mar 27 14:53:18 xyz-deb kernel: [259465.752508] Call Trace:
Mar 27 14:53:18 xyz-deb kernel: [259465.752519] [<ffffffff810fe240>] ?
__lock_page+0x80/0x80
Mar 27 14:53:18 xyz-deb kernel: [259465.752528] [<ffffffff8146aea8>] ?
io_schedule+0x88/0xe0
Mar 27 14:53:18 xyz-deb kernel: [259465.752533] [<ffffffff810fe249>] ?
sleep_on_page+0x9/0x20
Mar 27 14:53:18 xyz-deb kernel: [259465.752539] [<ffffffff8146b432>] ?
__wait_on_bit+0x52/0x80
Mar 27 14:53:18 xyz-deb kernel: [259465.752544] [<ffffffff810fe373>] ?
wait_on_page_bit+0x73/0x80
Mar 27 14:53:18 xyz-deb kernel: [259465.752551] [<ffffffff81082180>] ?
wake_atomic_t_function+0x40/0x40
Mar 27 14:53:18 xyz-deb kernel: [259465.752556] [<ffffffff810fe450>] ?
filemap_fdatawait_range+0xd0/0x160
Mar 27 14:53:18 xyz-deb kernel: [259465.752562] [<ffffffff810ff9ec>] ?
__filemap_fdatawrite_range+0x4c/0x60
Mar 27 14:53:18 xyz-deb kernel: [259465.752567] [<ffffffff810ffa39>] ?
filemap_write_and_wait_range+0x39/0x60
Mar 27 14:53:18 xyz-deb kernel: [259465.752600] [<ffffffffa00d5256>] ?
ext4_sync_file+0xb6/0x340 [ext4]
Mar 27 14:53:18 xyz-deb kernel: [259465.752607] [<ffffffff8118a068>] ?
do_fsync+0x48/0x80
Mar 27 14:53:18 xyz-deb kernel: [259465.752613] [<ffffffff8118a2ee>] ?
SyS_fdatasync+0xe/0x20
Mar 27 14:53:18 xyz-deb kernel: [259465.752619] [<ffffffff81473ce2>] ?
system_call_fastpath+0x16/0x1b
Mar 27 14:55:01 xyz-deb /USR/SBIN/CRON[29006]: (root) CMD (command -v
debian-sa1 > /dev/null && debian-sa1 1 1)
Mar 27 14:55:18 xyz-deb kernel: [259585.930755] INFO: task
BrowserBlocking:11047 blocked for more than 120 seconds.
Mar 27 14:55:18 xyz-deb kernel: [259585.930764] Tainted: P O
3.13.6-201403190021xyz-deb-dirty #4
Mar 27 14:55:18 xyz-deb kernel: [259585.930767] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 27 14:55:18 xyz-deb kernel: [259585.930777] BrowserBlocking D
ffff8800b93acb68 0 11047 1 0x00000000
Mar 27 14:55:18 xyz-deb kernel: [259585.930785] ffff8800b93ac840
0000000000000082 0000000000000004 ffff880235cfe740
Mar 27 14:55:18 xyz-deb kernel: [259585.930792] 0000000000012dc0
ffff8801e63d3fd8 0000000000012dc0 ffff8800b93ac840
Mar 27 14:55:18 xyz-deb kernel: [259585.930797] 0000000000000000
ffff8800b93ac840 ffff88023ec93600 ffff8801e63d3da0
Mar 27 14:55:18 xyz-deb kernel: [259585.930804] Call Trace:
Mar 27 14:55:18 xyz-deb kernel: [259585.930815] [<ffffffff810fe240>] ?
__lock_page+0x80/0x80
Mar 27 14:55:18 xyz-deb kernel: [259585.930823] [<ffffffff8146aea8>] ?
io_schedule+0x88/0xe0
Mar 27 14:55:18 xyz-deb kernel: [259585.930828] [<ffffffff810fe249>] ?
sleep_on_page+0x9/0x20
Mar 27 14:55:18 xyz-deb kernel: [259585.930835] [<ffffffff8146b432>] ?
__wait_on_bit+0x52/0x80
Mar 27 14:55:18 xyz-deb kernel: [259585.930840] [<ffffffff810fe373>] ?
wait_on_page_bit+0x73/0x80
Mar 27 14:55:18 xyz-deb kernel: [259585.930846] [<ffffffff81082180>] ?
wake_atomic_t_function+0x40/0x40
Mar 27 14:55:18 xyz-deb kernel: [259585.930852] [<ffffffff810fe450>] ?
filemap_fdatawait_range+0xd0/0x160
Mar 27 14:55:18 xyz-deb kernel: [259585.930857] [<ffffffff810ff9ec>] ?
__filemap_fdatawrite_range+0x4c/0x60
Mar 27 14:55:18 xyz-deb kernel: [259585.930862] [<ffffffff810ffa39>] ?
filemap_write_and_wait_range+0x39/0x60
Mar 27 14:55:18 xyz-deb kernel: [259585.930895] [<ffffffffa00d5256>] ?
ext4_sync_file+0xb6/0x340 [ext4]
Mar 27 14:55:18 xyz-deb kernel: [259585.930902] [<ffffffff8118a068>] ?
do_fsync+0x48/0x80
Mar 27 14:55:18 xyz-deb kernel: [259585.930908] [<ffffffff8118a2ee>] ?
SyS_fdatasync+0xe/0x20
Mar 27 14:55:18 xyz-deb kernel: [259585.930915] [<ffffffff81473ce2>] ?
system_call_fastpath+0x16/0x1b
To add some information, here is how my filesystem is laid out:
Filesystem Size Used Avail Use% Mounted on
rootfs 9.7G 553M 8.7G 6% /
udev 10M 0 10M 0% /dev
tmpfs 790M 568K 789M 1% /run
/dev/mapper/xyz--deb-root 9.7G 553M 8.7G 6% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 4.8G 79M 4.7G 2% /run/shm
/dev/sda1 228M 46M 170M 22% /boot
tmpfs 3.9G 12M 3.9G 1% /tmp
/dev/mapper/xyz--deb-usr 8.2G 5.9G 1.8G 77% /usr
/dev/mapper/xyz--deb-var 2.7G 1.3G 1.3G 50% /var
/dev/bcache0 394G 100G 275G 27% /home
tmpfs 256M 0 256M 0% /home/nmartin/.chromecache
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
udev on /dev type devtmpfs (rw,relatime,size=10240k,nr_inodes=1009238,mode=755)
devpts on /dev/pts type devpts
(rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,noexec,relatime,size=808044k,mode=755)
/dev/mapper/xyz--deb-root on / type ext4
(rw,relatime,errors=remount-ro,stripe=4,data=ordered)
tmpfs on /run/lock type tmpfs (rw,nosuid,nodev,noexec,relatime,size=5120k)
tmpfs on /run/shm type tmpfs (rw,nosuid,nodev,noexec,relatime,size=4949400k)
/dev/sda1 on /boot type ext2 (rw,relatime,errors=continue)
tmpfs on /tmp type tmpfs (rw,relatime)
/dev/mapper/xyz--deb-usr on /usr type ext4 (rw,relatime,data=ordered)
/dev/mapper/xyz--deb-var on /var type ext4 (rw,relatime,data=ordered)
/dev/bcache0 on /home type ext4 (rw,relatime,data=ordered)
tmpfs on /home/nmartin/.chromecache type tmpfs
(rw,nosuid,nodev,noatime,size=262144k)
rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw,relatime)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc
(rw,nosuid,nodev,noexec,relatime)
I have a 55 GB partition on an SSD that is a bcache cache of /home, which is an
lv
--- Physical volume ---
PV Name /dev/sda5
VG Name xyz-deb
PV Size 1.82 TiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 476870
Free PE 262486
Allocated PE 214384
PV UUID VNCi4f-9rZl-T7dd-TETi-URJ7-SsYi-JQnmoO
--- Volume group ---
VG Name xyz-deb
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 13
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 7
Open LV 5
Max PV 0
Cur PV 1
Act PV 1
VG Size 1.82 TiB
PE Size 4.00 MiB
Total PE 476870
Alloc PE / Size 214384 / 837.44 GiB
Free PE / Size 262486 / 1.00 TiB
VG UUID EHBENC-dT2G-SxxB-fBNd-3zV2-vorO-16xV34
--- Logical volume ---
LV Path /dev/xyz-deb/root
LV Name root
VG Name xyz-deb
LV UUID nUS1LF-VIPc-1KNp-Nu8Y-Sabv-pe5a-nJfn8k
LV Write Access read/write
LV Creation host, time xyz-deb, 2013-11-22 14:47:03 -0600
LV Status available
# open 1
LV Size 10.00 GiB
Current LE 2560
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/xyz-deb/usr
LV Name usr
VG Name xyz-deb
LV UUID 6cNQ6o-4rMI-8NGO-6gYD-ADE2-pf3g-uVoB8C
LV Write Access read/write
LV Creation host, time xyz-deb, 2013-11-22 14:47:03 -0600
LV Status available
# open 1
LV Size 8.38 GiB
Current LE 2145
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/xyz-deb/var
LV Name var
VG Name xyz-deb
LV UUID wIojaY-ju1D-wcVb-WyJI-8264-Txy0-WMaRLd
LV Write Access read/write
LV Creation host, time xyz-deb, 2013-11-22 14:47:03 -0600
LV Status available
# open 1
LV Size 2.79 GiB
Current LE 715
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
--- Logical volume ---
LV Path /dev/xyz-deb/swap_1
LV Name swap_1
VG Name xyz-deb
LV UUID KNevOm-qWv0-TdKm-wfkZ-GFNJ-Xjox-SkTTT4
LV Write Access read/write
LV Creation host, time xyz-deb, 2013-11-22 14:47:03 -0600
LV Status available
# open 2
LV Size 15.89 GiB
Current LE 4069
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/xyz-deb/tmp
LV Name tmp
VG Name xyz-deb
LV UUID 3RgsAJ-I6CM-ChT9-nlJI-scPd-eIEA-BVnmis
LV Write Access read/write
LV Creation host, time xyz-deb, 2013-11-22 14:47:04 -0600
LV Status available
# open 0
LV Size 380.00 MiB
Current LE 95
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:4
--- Logical volume ---
LV Path /dev/xyz-deb/home
LV Name home
VG Name xyz-deb
LV UUID oX5edl-Dut2-67rF-j7Dr-Nrx3-7wLf-2JZljv
LV Write Access read/write
LV Creation host, time xyz-deb, 2013-11-22 14:47:04 -0600
LV Status available
# open 0
LV Size 400.00 GiB
Current LE 102400
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:5
--- Logical volume ---
LV Path /dev/xyz-deb/home-cache
LV Name home-cache
VG Name xyz-deb
LV UUID ZFf8rc-IRbm-1uSi-6iAW-7I8r-bMSA-di75Bk
LV Write Access read/write
LV Creation host, time xyz-deb, 2014-02-01 19:50:47 -0600
LV Status available
# open 1
LV Size 400.00 GiB
Current LE 102400
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:6
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