>From IRC, an example of a testcase:
1) create around ~300GB of small files (sqlite files for example), put the
files into a list sqlite-files.txt
2) Start the copy:
cat sqlite-files.txt | xargs -n1 -I{} -P2 sudo sh -c 'rm -f {}.new; cat {} >
{}.new; echo {}'
3) When it hangs, identify where it hung as $NUM and resume with the following:
tail -n+$NUM | xargs -n1 -I{} -P2 sudo sh -c 'rm -f {}.new; cat {} > {}.new;
echo {}'
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1349711
Title:
Machine lockup in btrfs-transaction
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
This has happened twice now.
I'm on an AWS EC2 m3.large instance with the official Ubuntu AMI ami-
776d9700.
# cat /proc/version_signature
Ubuntu 3.13.0-32.57-generic 3.13.11.4
After running for many days, the machine locked up with the below
messages appearing on the console. The machine would respond to ping
but not SSH or HTTP requests. The machine has one BTRFS volume which
is 87% full and lives on an Logical Volume Manager (LVM) block device
on top of one Amazon Elastic Block Store (EBS) device.
Error messages after first reboot:
[ 77.609490] BTRFS error (device dm-0): block group 10766778368 has wrong
amount of free space
[ 77.613678] BTRFS error (device dm-0): failed to load free space cache for
block group 10766778368
[ 77.643801] BTRFS error (device dm-0): block group 19356712960 has wrong
amount of free space
[ 77.648952] BTRFS error (device dm-0): failed to load free space cache for
block group 19356712960
[ 77.926325] BTRFS error (device dm-0): block group 20430454784 has wrong
amount of free space
[ 77.931078] BTRFS error (device dm-0): failed to load free space cache for
block group 20430454784
[ 78.111437] BTRFS error (device dm-0): block group 21504196608 has wrong
amount of free space
[ 78.116165] BTRFS error (device dm-0): failed to load free space cache for
block group 21504196608
Error messages after second reboot:
[ 45.390221] BTRFS error (device dm-0): free space inode generation (0) did
not match free space cache generation (70012)
[ 45.413472] BTRFS error (device dm-0): free space inode generation (0) did
not match free space cache generation (70012)
[ 467.423961] BTRFS error (device dm-0): block group 518646661120 has wrong
amount of free space
[ 467.429251] BTRFS error (device dm-0): failed to load free space cache for
block group 518646661120
Error messages on the console after second lock-up follow:
[246736.752053] INFO: rcu_sched self-detected stall on CPU { 0} (t=2220246
jiffies g=35399662 c=35399661 q=0)
[246736.756059] INFO: rcu_sched detected stalls on CPUs/tasks: { 0} (detected
by 1, t=2220247 jiffies, g=35399662, c=35399661, q=0)
[246764.192014] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u30:2:1828]
[246764.212058] BUG: soft lockup - CPU#1 stuck for 23s! [btrfs-transacti:492]
[246792.192022] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u30:2:1828]
[246792.212057] BUG: soft lockup - CPU#1 stuck for 23s! [btrfs-transacti:492]
[246820.192052] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u30:2:1828]
[246820.212018] BUG: soft lockup - CPU#1 stuck for 23s! [btrfs-transacti:492]
[246848.192052] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u30:2:1828]
[246848.212058] BUG: soft lockup - CPU#1 stuck for 23s! [btrfs-transacti:492]
[246876.192053] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u30:2:1828]
[246876.212057] BUG: soft lockup - CPU#1 stuck for 22s! [btrfs-transacti:492]
[246904.192053] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u30:2:1828]
[246904.212058] BUG: soft lockup - CPU#1 stuck for 22s! [btrfs-transacti:492]
[246916.772052] INFO: rcu_sched self-detected stall on CPU[246916.776058]
INFO: rcu_sched detected stalls on CPUs/tasks:
[246944.192053] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u30:2:1828]
[246944.212058] BUG: soft lockup - CPU#1 stuck for 22s! [btrfs-transacti:492]
[246972.192053] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u30:2:1828]
[246972.212018] BUG: soft lockup - CPU#1 stuck for 22s! [btrfs-transacti:492]
[247000.192053] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u30:2:1828]
[247000.212058] BUG: soft lockup - CPU#1 stuck for 22s! [btrfs-transacti:492]
[247028.192054] BUG: soft lockup - CPU#0 stuck for 22s! [kworker/u30:2:1828]
[247028.212058] BUG: soft lockup - CPU#1 stuck for 22s! [btrfs-transacti:492]
[247056.192053] BUG: soft lockup - CPU#0 stuck for 23s! [kworker/u30:2:1828]
[247056.212061] BUG: soft lockup - CPU#1 stuck for 23s! [btrfs-transacti:492]
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349711/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : [email protected]
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
