Re: crash on rbd bench-write

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Any particular reason why you have the image mounted via the kernel client while performing a benchmark?  Not to say this is the reason for the crash, but strange since 'rbd bench-write' will not test the kernel IO speed since it uses the user-mode library.  Are you able to test bench-write with a Ceph Hammer-release client?

--

Jason

> Hiya. Playing with a small cephs setup from the Quick start documentation.
> 
> Seeing an issue running rdb bench-write. Initial trace is provided
> below, let me know if you need other information. fwiw the rados bench
> works just fine.
> 
> Any idea what is causing this? Is it a parsing issue in the rbd command?
>
> Thanks
> --Glenn
> 
> root@ceph-client:~# uname -a
> Linux ceph-client 4.1.6-rh1-xenU #1 SMP Fri Sep 4 02:50:30 UTC 2015
> x86_64 x86_64 x86_64 GNU/Linux
> 
> root@ceph-client:~# rbd --version
> ceph version 0.80.10 (ea6c958c38df1216bf95c927f143d8b13c4a9e70)
> 
> root@ceph-client:~# rbd showmapped
> id pool image snap device
> 0  rbd  foo   -    /dev/rbd0
> 
> root@ceph-client:/mnt/ceph-block-device# rbd info foo
> rbd image 'foo':
>          size 4096 MB in 1024 objects
>          order 22 (4096 kB objects)
>          block_name_prefix: rb.0.1073.238e1f29
>          format: 1
> root@ceph-client:/mnt/ceph-block-device# man rbd
> 
> root@ceph-client:/mnt/ceph-block-device# rbd bench-write foo
> bench-write  io_size 4096 io_threads 16 bytes 1073741824 pattern seq
>    SEC       OPS   OPS/SEC   BYTES/SEC
> *** Error in `rbd': free(): invalid pointer: 0x56a727a8 ***
> *** Caught signal (Aborted) **
>   in thread f26feb40
>   ceph version 0.80.10 (ea6c958c38df1216bf95c927f143d8b13c4a9e70)
>   1: (()+0x24a20) [0x5664aa20]
>   2: [0xf77abe50]
>   3: [0xf77abe80]
>   4: (gsignal()+0x47) [0xf6a60607]
>   5: (abort()+0x143) [0xf6a63a33]
>   6: (()+0x68e53) [0xf6a9ae53]
>   7: (()+0x7333a) [0xf6aa533a]
>   8: (()+0x73fad) [0xf6aa5fad]
>   9: (operator delete(void*)+0x1f) [0xf6c4682f]
>   10: (librbd::C_AioWrite::~C_AioWrite()+0x26) [0xf76f90b6]
>   11: (Context::complete(int)+0x1f) [0xf76ca52f]
>   12: (librbd::rados_req_cb(void*, void*)+0x48) [0xf76d7f58]
>   13: (librados::C_AioSafe::finish(int)+0x2b) [0xf6eb719b]
>   14: (Context::complete(int)+0x17) [0xf6e8f6f7]
>   15: (Finisher::finisher_thread_entry()+0x1a8) [0xf6f5b3a8]
>   16: (Finisher::FinisherThread::entry()+0x1e) [0xf7746f7e]
>   17: (Thread::entry_wrapper()+0x4f) [0xf6f82ebf]
>   18: (Thread::_entry_func(void*)+0x1b) [0xf6f82efb]
>   19: (()+0x6f70) [0xf6d1ff70]
>   20: (clone()+0x5e) [0xf6b1dbee]
> 2015-09-04 04:30:46.755568 f26feb40 -1 *** Caught signal (Aborted) **
>   in thread f26feb40
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