Here is a fresh snapshot hang example:
Here kworker/u24:0 is blocked waiting on btrfs_tree_read_lock.
And again underlaying is btrfs_search_slot after it has gone through
cache_block_group.
The other two has blocked on the same place in cache_block_group. So I
can confirm it is hanging the same
Hi Jeff,
That's exactly what I am observing in the backtraces.
umount reaches cache_block_group passing through btrfs_search_slot,
which looks like got the wr_lock (to be confirmed tomorrow when I'm in
the office) and all other btrfs worker threads are fighting for the
btrfs_tree_read_lock.
Umount
On 8/8/17 7:30 AM, Angel Shtilianov wrote:
> crash> bt -f 31625
> PID: 31625 TASK: 88046a833400 CPU: 7 COMMAND: "btrfs-transacti"
> wants to acquire struct extent_buffer 88000460aca0 lock, whose
> lock_owner is 27574.
>
> here is pid 27574:
> PID: 27574 TASK: 88038b469a00 CPU: 4
crash> bt -f 31625
PID: 31625 TASK: 88046a833400 CPU: 7 COMMAND: "btrfs-transacti"
wants to acquire struct extent_buffer 88000460aca0 lock, whose
lock_owner is 27574.
here is pid 27574:
PID: 27574 TASK: 88038b469a00 CPU: 4 COMMAND: "kworker/u32:9"
which is also is trying to
On 8/7/17 1:19 PM, Jeff Mahoney wrote:
> On 8/7/17 10:12 AM, Angel Shtilianov wrote:
>> Hi there,
>> I'm investigating sporadic hanging during btrfs umount. The FS is
>> contained in a loop mounted file.
>> I have no reproduction scenario and the issue may happen once a day or
>> once a month. It
On 8/7/17 10:12 AM, Angel Shtilianov wrote:
> Hi there,
> I'm investigating sporadic hanging during btrfs umount. The FS is
> contained in a loop mounted file.
> I have no reproduction scenario and the issue may happen once a day or
> once a month. It is rare, but frustrating.
> I have a crashdump
On 7.08.2017 17:12, Angel Shtilianov wrote:
> Hi there,
> I'm investigating sporadic hanging during btrfs umount. The FS is
> contained in a loop mounted file.
> I have no reproduction scenario and the issue may happen once a day or
> once a month. It is rare, but frustrating.
> I have a
Hi there,
I'm investigating sporadic hanging during btrfs umount. The FS is
contained in a loop mounted file.
I have no reproduction scenario and the issue may happen once a day or
once a month. It is rare, but frustrating.
I have a crashdump (the server has been manually crashed and collected
a
