[Bugs] [Bug 1379655] Recording (ffmpeg) processes on FUSE get hung

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1379655

Raghavendra G <rgowdapp at redhat.com> changed:

           What    |Removed                     |Added
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             Status|POST                        |MODIFIED
              Flags|needinfo?(rgowdapp at redhat.c |
                   |om)                         |



--- Comment #10 from Raghavendra G <rgowdapp at redhat.com> ---
Description of the bug: (f)stat syscall was hung. On looking at 3 statedumps
collected in comment 8 (glusterdump.303.dump.1474546152,
glusterdump.303.dump.1474546203 , glusterdump.303.dump.1474546233) I've
following observations:

1. Call stack of all three are identical.
2. there are a bunch of fstat and flush stuck in write-behind.
3. I don't see stack involving frames belonging to any of children of
write-behind.

Based on the above observations, my deductions are:
1. stack represents a hang, but not in-progress operations.
2. Culprit is write-behind. Seems like there is a bug in write-behind which is
causing the hang.

Description of fix can be found in comment #5

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