Bug #7062: Dead lock happend if daemonize - Ceph - Ceph

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Bug #7062

closed

Dead lock happend if daemonize

Added by Haomai Wang over 10 years ago. Updated over 10 years ago.

Status:

Resolved

Priority:

Urgent

Assignee:

Haomai Wang

Category:

OSD

Target version:

% Done:

Source:

Community (dev)

Tags:

Backport:

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

Crash signature (v1):

Crash signature (v2):

Description

New ceph_osd.cc code did ObjectStore init work before global_init_daemonize(), and WBThrottle thread is created when objectstore constructed. So after daemon(), WBThrottle thread won't exist in new process. It will result in deadlock.

When "cur_ios" which is member of WBThrottle hits hard limit, there exists two ways to decrease "cur_ios". The first is WBThrottle thread which is dead if deamonize, another is SyncThread. SyncThread will block at op_tp.pause() because thread in op_tp(threadpool) block at wbthrottle.throttle(FileStore::_do_op). So no thread will continue process jobs in filestore layer and all threads is waiting.

Turn off daemon is OK