Bug #4134: mds: request locking hang under snaptests - CephFS - Ceph

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Bug #4134

closed

mds: request locking hang under snaptests

Added by Greg Farnum about 11 years ago. Updated almost 8 years ago.

Status:

Resolved

Priority:

Low

Assignee:

Category:

Target version:

% Done:

Source:

Development

Tags:

Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Component(FS):

MDS

Labels (FS):

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

Haven't diagnosed this yet, but I ran into it while testing for #3819. Logs in kai:~/logs/4134.
First step, just figure out what the issue is. Then resolve or prioritize.

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Updated by Greg Farnum about 11 years ago

Description updated (diff)

For reference, the hung request is client.4104:75.

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Updated by Greg Farnum about 11 years ago

Status changed from New to In Progress

The request is attempting to read a snapshotted inode, but the inode is still in the LOCK_SNAP_SYNC state from when it was created (as part of cow_inode). I see a client_cap_release coming in that should apply to that inode, but it's being dismissed(?I think?) due to the wrong issue_seq. Checking out that angle now.

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