Hi,
Btrfs-transaction keeps blocking for me on all 3.15-rc versions.
3.14 does not have this issue.
The process never gets unstuck. btrfs fi sync does not help. A hard
reboot seems to be the only way to recover.
The volume is still readable when it's in this state.
dmesg + sysrq-w is available at http://pastebin.com/vHQnRE2F
It's over 6000 lines, and would most likely not be allowed on the list.
The blocking happons on a server with local kvm-clients reading and
writing to a local btrfs-volume over nfs.
The btrfs-volume is on top of dm-crypt devices.
Any additional info I can give to help?
Tests you want me to run?
--
Torbjørn
--snip--
[138011.263478] INFO: task btrfs-transacti:4157 blocked for more than
120 seconds.
[138011.263558] Tainted: G E 3.15.0-rc6 #58
[138011.263605] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[138011.263687] btrfs-transacti D ffff88042fc94500 0 4157 2 0x00000000
[138011.263744] ffff880400737e10 0000000000000002 ffff880403b33260
ffff880400737fd8
[138011.263831] 0000000000014500 0000000000014500 ffff88041973b260
ffff8802a9c97b40
[138011.263919] ffff880403a0e800 ffff880400737e30 ffff8800c950ac00
ffff8800c950ac58
[138011.264007] Call Trace:
[138011.264045] [<ffffffff816f81a9>] schedule+0x29/0x70
[138011.264097] [<ffffffffa01a6f65>]
btrfs_commit_transaction+0x315/0xa10 [btrfs]
[138011.264178] [<ffffffff810acf40>] ? prepare_to_wait_event+0x100/0x100
[138011.264235] [<ffffffffa01a2ea5>] transaction_kthread+0x1b5/0x240
[btrfs]
[138011.264293] [<ffffffffa01a2cf0>] ?
btrfs_cleanup_transaction+0x560/0x560 [btrfs]
[138011.264376] [<ffffffff81088e72>] kthread+0xd2/0xf0
[138011.264422] [<ffffffff81088da0>] ? kthread_create_on_node+0x190/0x190
[138011.264475] [<ffffffff81704dfc>] ret_from_fork+0x7c/0xb0
[138011.264522] [<ffffffff81088da0>] ? kthread_create_on_node+0x190/0x190
--snip--
--
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