[Ocfs2-users] OCFS2 KVM Crashes Yet Again !

[Gang He]

Hello netbsd,

The ocfs2 project is still be developed by us (from SUE, Huawei, Oracle and H3C. etc.).
If you encountered some problem, please send the mail to ocfs2-devel mail list, we usually watch that mail for ocfs2 kernel related issues.




>>> 
> Hello All,
> 
> I wrote earlier about our OCFS2 crash issue in KVM due to bug in the SMP 
> code.
> 
> For this we come up with a solution:
> 
> Instead of using multiple vcpus
>    <vcpu placement='static'>8</vcpu>
> 
> using a single one and multiple cores instead:
>      <topology sockets='8' cores='8' threads='1'/>
> 
> And applying key tune options to sysctl.conf:
> 
> vm.min_free_kbytes=131072
> vm.zone_reclaim_mode=1
> 
> Seemed to be helped, the fs did not crash right away when we were 
> hammering it with apache benchmarks with 10000 requests however last 
> night I started a large rsync operation from a 5TB OCFS2 FS mounted in 
> the VM to another OCFS2 mounted in the same VM and ended up with:
> 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__ibb.co_gFeGg5&d=DwICAg&c=R 
> oP1YumCXCgaWHvlZYR8PQcxBKCX5YTpkKY057SbK10&r=QxGl6UoyzTJm_1fAz5ZR9izvWJhWcqbtY
> n-0afBpa7A&m=cYprGRHz-oQmhnx4HIke8sTdCG_tf8Jb-rF6sHnYLnk&s=ajWfQIlUZOpElFWxoKcmvTI
> k7J3PpuCJITcnXfJQHrc&e= 
>From the kernel crash backtrace, this problem should be that long time to acquiring spin_lock triggers a NMI interruption.
Could you give a detailed reproduce steps? since we want to reproduce this issue in local, then try to fix it. 


Thanks
Gang 

> 
> After trying a lot of different kernels starting from the 3.x series, 
> now we are using 4.13.2 latest kernel with default configuration but 
> these issues still present. Is this OCFS2 project still being developed? 
> With this crashing and unreliability it cannot be used in production 
> unless you put in place bunch of safeguards to reset out the whole 
> virtualmachine when it crashes.
> 
> Thanks
> 
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users at oss.oracle.com 
> https://oss.oracle.com/mailman/listinfo/ocfs2-users