Multiple OSD crashing a lot

[Blade Doyle <blade.doyle@xxxxxxxxx>]

I get a lot of osd crash with the following stack - suggestion please:

     0> 1969-12-31 16:04:55.455688 83ccf410 -1 osd/ReplicatedPG.cc: In function 'void ReplicatedPG::hit_set_trim(ReplicatedPG::RepGather*, unsigned int)' thread 83ccf410 time 295.324905
osd/ReplicatedPG.cc: 11011: FAILED assert(obc)

 ceph version 0.80.7 (6c0127fcb58008793d3c8b62d925bc91963672a3)
 1: (ReplicatedPG::hit_set_trim(ReplicatedPG::RepGather*, unsigned int)+0x3f9) [0xb6c625e6]
 2: (ReplicatedPG::hit_set_persist()+0x8bf) [0xb6c62fb4]
 3: (ReplicatedPG::do_op(std::tr1::shared_ptr<OpRequest>)+0xc97) [0xb6c6eb2c]
 4: (ReplicatedPG::do_request(std::tr1::shared_ptr<OpRequest>, ThreadPool::TPHandle&)+0x439) [0xb6c2f01a]
 5: (OSD::dequeue_op(boost::intrusive_ptr<PG>, std::tr1::shared_ptr<OpRequest>, ThreadPool::TPHandle&)+0x22b) [0xb6b0b984]
 6: (OSD::OpWQ::_process(boost::intrusive_ptr<PG>, ThreadPool::TPHandle&)+0x13d) [0xb6b1ccf6]
 7: (ThreadPool::WorkQueueVal<std::pair<boost::intrusive_ptr<PG>, std::tr1::shared_ptr<OpRequest> >, boost::intrusive_ptr<PG> >::_void_process(void*, ThreadPool::TPHandle&)+0x6b) [0xb6b4692c]
 8: (ThreadPool::worker(ThreadPool::WorkThread*)+0xb93) [0xb6e152bc]
 9: (ThreadPool::WorkThread::entry()+0x9) [0xb6e15aea]
 NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to interpret this.

Blade.

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