Ceph » rgw

On Aug. 24, Supriti Singh sent a link to:

/usr/bin/ganesha.nfsd -f /etc/ganesha/ganesha.conf -F

• Caught signal (Segmentation fault)
  in thread 7f74437fe700 thread_name:ganesha.nfsd
  ceph version v12.1.2-550-g59afe41c49 (59afe41c491258cd4f9d215e53b86b0c2c62b138) luminous (rc)
  1: (()+0x44c529) [0x7f7537e92529]
  2: (()+0x10b10) [0x7f753b2e2b10]
  3: (()+0x124a0) [0x7f753b2e44a0]
  4: (cohort::lru::LRU<std::mutex>::evict_block()+0x42) [0x7f7537bdc642]
  5: (rgw::RGWLibFS::lookup_fh(rgw::RGWFileHandle*, char const*, unsigned int)+0x37c) [0x7f7537be2fbc]
  6: (rgw::RGWLibFS::stat_leaf(rgw::RGWFileHandle*, char const*, rgw_fh_type, unsigned int)+0x9b5) [0x7f7537bcb3b5]
  7: (rgw_lookup()+0xb1) [0x7f7537bcb9d1]
  8: (()+0x48bc) [0x7f753819f8bc]
  9: (()+0x4a43) [0x7f753819fa43]
  10: (rgw::RGWReaddirRequest::send_response()+0x371) [0x7f7537be3a11]
  11: (rgw::RGWLibProcess::process_request(rgw::RGWLibRequest*, rgw::RGWLibIO*)+0x4a6) [0x7f7537bbe066]
  12: (rgw::RGWLibProcess::process_request(rgw::RGWLibRequest*)+0xed) [0x7f7537bbef2d]
  13: (rgw::RGWFileHandle::readdir(bool ()(char const, void*, unsigned long, unsigned int), void*, unsigned long*, bool*, unsigned int)+0x5ef) [0x7f7537bd016f]
  14: (()+0x4bf3) [0x7f753819fbf3]
  15: (mdcache_populate_dir_chunk()+0x24b) [0x54b182]
  16: (mdcache_readdir_chunked()+0x754) [0x54bc2e]
  17: /usr/bin/ganesha.nfsd() [0x53c4ca]
  18: (fsal_readdir()+0x28b) [0x436311]
  19: (nfs4_op_readdir()+0x55a) [0x47e0a4]
  20: (nfs4_Compound()+0xa1e) [0x462629]
  21: (nfs_rpc_execute()+0x1d53) [0x44f1c6]
  22: /usr/bin/ganesha.nfsd() [0x44f9d0]
  23: /usr/bin/ganesha.nfsd() [0x50bac7]
  24: (()+0x8744) [0x7f753b2da744]
  25: (clone()+0x6d) [0x7f753abc3aad]
  2017-08-18 10:27:39.615573 7f74437fe700 -1 Caught signal (Segmentation fault) *
  in thread 7f74437fe700 thread_name:ganesha.nfsd

The root cause of this appears to be missing logic to take the lane lock at cohort_lru.h l. 137. The unlock paths are intact, so this thread could (impl. defined) unlock a lock held in another path.