(gdb) bt
#0  0x00007f5403aeef2b in raise () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00000000005fd7d2 in reraise_fatal (signum=6) at global/signal_handler.cc:59
#2  0x00000000005fd99d in handle_fatal_signal (signum=6) at global/signal_handler.cc:109
#3  <signal handler called>
#4  0x00007f540206c3a5 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x00007f540206fb0b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x00007f540292ad7d in __gnu_cxx::__verbose_terminate_handler() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#7  0x00007f5402928f26 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#8  0x00007f5402928f53 in std::terminate() () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#9  0x00007f540292904e in __cxa_throw () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#10 0x00000000005cfd33 in ceph::__ceph_assert_fail (assertion=0x705182 "!info.dne()", file=0x7036da "osd/OSD.cc", line=1242,
    func=0x707080 "PG* OSD::get_or_create_pg(const PG::Info&, epoch_t, int, int&, bool, ObjectStore::Transaction**, C_Contexts**)") at common/assert.cc:70
#11 0x000000000054b2d1 in OSD::get_or_create_pg (this=0x20ec000, info=..., epoch=12531, from=24, created=@0x7f53f760637c, primary=false, pt=0x7f53f7606368, pfin=0x7f53f7606370) at osd/OSD.cc:1242
#12 0x000000000054bae0 in OSD::handle_pg_log (this=0x20ec000, m=0x9c95b00) at osd/OSD.cc:4387
#13 0x0000000000553c98 in OSD::_dispatch (this=0x20ec000, m=0x9c95b00) at osd/OSD.cc:2860
#14 0x00000000005549de in OSD::ms_dispatch (this=0x20ec000, m=0x9c95b00) at osd/OSD.cc:2673
#15 0x00000000005bc0db in ms_deliver_dispatch (m=0x9c95b00, this=0x20dda00) at msg/Messenger.h:102
#16 SimpleMessenger::dispatch_entry (this=0x20dda00) at msg/SimpleMessenger.cc:364
#17 0x00000000004b237c in SimpleMessenger::DispatchThread::entry (this=<optimized out>) at msg/SimpleMessenger.h:544
#18 0x00007f5403ae6efc in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#19 0x00007f540211789d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#20 0x0000000000000000 in ?? ()
(gdb)