Bug 10714 - Samba 4 AD consuming 100%
Summary: Samba 4 AD consuming 100%
Alias: None
Product: Samba 4.1 and newer
Classification: Unclassified
Component: AD: LDB/DSDB/SAMDB (show other bugs)
Version: 4.1.9
Hardware: x64 Linux
: P5 major (vote)
Target Milestone: ---
Assignee: Andrew Bartlett
QA Contact: Samba QA Contact
Depends on:
Reported: 2014-07-14 08:30 UTC by Antun Horvat
Modified: 2016-07-29 03:05 UTC (History)
1 user (show)

See Also:


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Description Antun Horvat 2014-07-14 08:30:56 UTC
Dear Samba Team,

I am experiencing a Samba4 AD bug that consumes 100% cpu usage (one thread). 
The strace on the problematic PID reports a whole loop of fcntl calls on FD 13, which points to "dc=domain,dc=local.ldb" file. 

I also have a core dump which I could send to you if you need it to find the issue.

I must also note that the issue persists even if I restart the samba, so currently my Samba 4 DC setup consumes 100% on two machines.
Comment 1 Andrew Bartlett 2016-07-29 03:05:39 UTC
A gdb 'bt full' on the core dump or process would have been useful, but I'm hoping that since 2014 we have fixed that, particularly with the performance improvements we have made for Samba 4.5.0rc1.

Otherwise, feel free to re-open and help us with info a 'flame graph' of the problem process:


(These tend to be the best debugging tool for this kind of thing).