Ceph » rbd

From http://qa-proxy.ceph.com/teuthology/sage-2015-01-24_15:03:19-rbd-next-distro-basic-multi/721344/

This can happen in the locking/fencing test, due to a use-after-free of the LingerOp watch() failed on. This produces a backtrace like:

#0  0x00007f550ac0f5cb in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)
    () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#1  0x00007f550c11ee11 in object_t (this=0x7fff70c6ab60) at ./include/object.h:33
#2  Objecter::Op::Op (this=0x1ab5d60, o=..., ol=..., op=..., f=32, ac=0x0, co=0x7fff70c6ad60, ov=0x7fff70c6ac48, offset=0x0)
    at ./osdc/Objecter.h:1197
#3  0x00007f550c11acab in prepare_mutate_op (objver=0x7fff70c6ac48, oncommit=0x7fff70c6ad60, onack=0x0, flags=0, mtime=..., 
    snapc=..., op=..., oloc=..., oid=..., this=0x7f5504021fe0) at ./osdc/Objecter.h:2018
#4  mutate (objver=0x7fff70c6ac48, oncommit=0x7fff70c6ad60, onack=0x0, flags=0, mtime=..., snapc=..., op=..., oloc=..., oid=..., 
    this=0x7f5504021fe0) at ./osdc/Objecter.h:2029
#5  librados::IoCtxImpl::unwatch (this=0x1a8e010, cookie=140002042318080) at librados/IoCtxImpl.cc:1144
#6  0x00007f54e9a90df1 in librbd::ImageWatcher::unregister_watch (this=0x1a9cd20) at librbd/ImageWatcher.cc:109
#7  0x00007f54e9a8b03a in librbd::ImageCtx::unregister_watch (this=this@entry=0x1a8d990) at librbd/ImageCtx.cc:617
#8  0x00007f54e9aab3d8 in librbd::close_image (ictx=ictx@entry=0x1a8d990) at librbd/internal.cc:2302
#9  0x00007f54e9a7f9d1 in rbd_close (image=0x1a8d990) at librbd/librbd.cc:1042