Re: [Ceph-community] Recover ceph-mon from 'Segfault on startup'

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Moving to ceph-devel.

On Mon, 6 Aug 2018, Brayan Perera wrote:
> Dear All,
> 
> We have encounter an issue on ceph mons, where all the ceph-mon instances
> went offline with following error.
> 
> 
> =======================
>      0> 2018-08-06 18:20:56.373266 7f9e4b98d700 -1 *** Caught signal
> (Segmentation fault) **
>  in thread 7f9e4b98d700 thread_name:cpu_tp
> 
>  ceph version 12.2.5 (cad919881333ac92274171586c827e01f554a70a) luminous
> (stable)
>  1: (()+0x8f51b1) [0x560c971ab1b1]
>  2: (()+0xf6d0) [0x7f9e541106d0]
>  3: (void std::vector<pg_t,
> mempool::pool_allocator<(mempool::pool_index_t)16, pg_t>
> >::_M_emplace_back_aux<pg_t const&>(pg_t const&)+0x69) [0x560c96fb5fd9]
>  4: (OSDMapMapping::_build_rmap(OSDMap const&)+0x209) [0x560c96fb5389]
>  5: (OSDMapMapping::_finish(OSDMap const&)+0x11) [0x560c96fb53c1]
>  6: (ParallelPGMapper::Job::finish_one()+0x82) [0x560c96fb4332]
>  7: (ParallelPGMapper::WQ::_process(ParallelPGMapper::Item*,
> ThreadPool::TPHandle&)+0x7f) [0x560c96fb43ff]
>  8: (ThreadPool::worker(ThreadPool::WorkThread*)+0xa8e) [0x560c96eaf59e]
>  9: (ThreadPool::WorkThread::entry()+0x10) [0x560c96eb0480]
>  10: (()+0x7e25) [0x7f9e54108e25]
>  11: (clone()+0x6d) [0x7f9e512febad]
>  NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed
> to interpret this.
> ============================

I haven't seen this one before.  I take it it happens reliably when you 
try to start the OSD?  Can you reproduce the bug and generate a mon log 
file by setting 'debug mon = 20'?

Thanks!
sage

>  
> 
> Before this we have change one of the test pools size to 1 from 3 for
> testing purpose.
> 
> Is there a way to recover this without loosing the data ?
> 
> 
> Thanks in advance.
> 
> Regards,
> Brayan
> 
> 
> 
> 
> 
> 
> -- 
> Best Regards,
> Brayan Perera
> 
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