[ZBX-3902] Child processes sometimes exit into a zombie state Created: 2011 Jun 21 Updated: 2017 May 30 Resolved: 2011 Jul 21 |
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| Status: | Closed |
| Project: | ZABBIX BUGS AND ISSUES |
| Component/s: | Agent (G), Proxy (P), Server (S) |
| Affects Version/s: | None |
| Fix Version/s: | 1.8.6, 1.9.5 (alpha) |
| Type: | Incident report | Priority: | Major |
| Reporter: | Rudolfs Kreicbergs | Assignee: | Unassigned |
| Resolution: | Fixed | Votes: | 0 |
| Labels: | None | ||
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Description |
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When a child process exits it is not always detected. It seems to be happen on a random basis, in one example case when conf syncer exits because of a bug, ~1 out of 3 times the server does not detect that and other processes continue to function normally. Also when the collector process exits for a UNIX agent, it is ignored by the main process and always goes into zombie state. |
| Comments |
| Comment by Rudolfs Kreicbergs [ 2011 Jun 30 ] |
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Fixed in dev branch: svn://svn.zabbix.com/branches/dev/ZBX-3902 The problem was caused by a race condition - SIGCHLD was registered after all child processes were created. Now SIGCHLD is registered when starting the daemon and set to SIG_IGN for each child in zbx_fork(). |
| Comment by Rudolfs Kreicbergs [ 2011 Jul 20 ] |
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Fixed/available in pre-1.8.6 r20693 and in pre-1.9.5 r20694. |
| Comment by Alexander Vladishev [ 2011 Jul 21 ] |
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After merge this changes into 1.8 branch don't work external checks: zabbix_server.log: <rudolfs> RESOLVED in 20708. The problem was that SIGCHLD was set to SIG_IGN. While the signal is ignored by default, setting it to SIG_IGN shows the system to wait on the children. In this case, the scripts exited before zbx_waitpid() was called and system had already taken care of them. <sasha> CLOSED |
| Comment by richlv [ 2011 Jul 28 ] |
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crashes server & proxy upon config reload. see |