Another BlueFS corruption

Another BlueFS corruption

[Somnath Roy]

Hi,
Got another corruption within BlueFS during replay.

Thread 1 "ceph-osd" received signal SIGSEGV, Segmentation fault.
0x0000555555d33bfc in BlueFS::_read (this=this@entry=0x7ffff34fca80, h=h@entry=0x7fffe8472300, buf=buf@entry=0x7fffe8472308, off=0, len=4096,
    outbl=outbl@entry=0x7fffffff58a0, out=0x0) at os/bluestore/BlueFS.cc:839
839           uint64_t l = MIN(p->length - x_off, want);
(gdb) bt
#0  0x0000555555d33bfc in BlueFS::_read (this=this@entry=0x7ffff34fca80, h=h@entry=0x7fffe8472300, buf=buf@entry=0x7fffe8472308, off=0, len=4096,
    outbl=outbl@entry=0x7fffffff58a0, out=0x0) at os/bluestore/BlueFS.cc:839
#1  0x0000555555d43abf in BlueFS::_replay (this=this@entry=0x7ffff34fca80) at os/bluestore/BlueFS.cc:475
#2  0x0000555555d46f2f in BlueFS::mount (this=0x7ffff34fca80) at os/bluestore/BlueFS.cc:343
#3  0x0000555555c2cb8d in BlueStore::_open_db (this=this@entry=0x7ffff3549c00, create=create@entry=false) at os/bluestore/BlueStore.cc:2096
#4  0x0000555555c50ded in BlueStore::mount (this=0x7ffff3549c00) at os/bluestore/BlueStore.cc:2739
#5  0x00005555559113f6 in OSD::init (this=0x7ffff35ff000) at osd/OSD.cc:2025
#6  0x0000555555874680 in main (argc=<optimized out>, argv=<optimized out>) at ceph_osd.cc:609

I got now total of 3 BlueFS replay bug and created the following tracker adding all crashes..

http://tracker.ceph.com/issues/16897

Thanks & Regards
Somnath
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