Periodic smbd crashes leading to heals

Issue

Smbd crashed with the following backtrace:

$ cat core_backtrace
{ "signal": 6
, "executable": "/usr/sbin/smbd"
, "stacktrace":
[ { "crash_thread": true
, "frames":
[ { "address": 139689779331575
, "build_id": "5861cfac90a2037fb2f649fdaf1b679b2a25f1e7"
, "build_id_offset": 217591
, "function_name": "raise"
, "file_name": "/usr/lib64/libc-2.17.so"
}
, { "address": 139689779337448
, "build_id": "5861cfac90a2037fb2f649fdaf1b679b2a25f1e7"
, "build_id_offset": 223464
, "function_name": "abort"
, "file_name": "/usr/lib64/libc-2.17.so"
}
, { "address": 139689806095582
, "build_id": "10c7be40e34688dc0f689d299970f51a95385da7"
, "build_id_offset": 296158
, "function_name": "dump_core"
, "file_name": "/usr/lib64/libsmbconf.so.0"
}
, { "address": 139689806034663
, "build_id": "10c7be40e34688dc0f689d299970f51a95385da7"
, "build_id_offset": 235239
, "function_name": "smb_panic_s3"
, "file_name": "/usr/lib64/libsmbconf.so.0"
}
, { "address": 139689840490847
, "build_id": "7027c6f2dc7860963ba8a4a35abf4a742bdeb89c"
, "build_id_offset": 145759
, "function_name": "smb_panic"
, "file_name": "/usr/lib64/libsamba-util.so.0.0.1"
}
, { "address": 139689835992615
, "build_id": "dca8a2e5cce0296fd7cee603182d411b40487a06"
, "build_id_offset": 1308199
, "function_name": "smbd_smb2_request_done_ex"
, "file_name": "/usr/lib64/samba/libsmbd-base-samba4.so"
}
, { "address": 139689835973762
, "build_id": "dca8a2e5cce0296fd7cee603182d411b40487a06"
, "build_id_offset": 1289346
, "function_name": "smbd_smb2_request_error_ex"
, "file_name": "/usr/lib64/samba/libsmbd-base-samba4.so"
}
, { "address": 139689835978063
, "build_id": "dca8a2e5cce0296fd7cee603182d411b40487a06"
, "build_id_offset": 1293647
, "function_name": "smbd_smb2_request_dispatch"
, "file_name": "/usr/lib64/samba/libsmbd-base-samba4.so"
}
, { "address": 139689835986965
, "build_id": "dca8a2e5cce0296fd7cee603182d411b40487a06"
, "build_id_offset": 1302549
, "function_name": "smbd_smb2_request_dispatch_immediate"
, "file_name": "/usr/lib64/samba/libsmbd-base-samba4.so"
}
, { "address": 139689783081658
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 23226
, "function_name": "tevent_common_loop_immediate"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783102621
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 44189
, "function_name": "epoll_event_loop_once"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783095975
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 37543
, "function_name": "std_event_loop_once"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783079117
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 20685
, "function_name": "_tevent_loop_once"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783079675
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 21243
, "function_name": "tevent_common_loop_wait"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783095879
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 37447
, "function_name": "std_event_loop_wait"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689835915652
, "build_id": "dca8a2e5cce0296fd7cee603182d411b40487a06"
, "build_id_offset": 1231236
, "function_name": "smbd_process"
, "file_name": "/usr/lib64/samba/libsmbd-base-samba4.so"
}
, { "address": 94030456597108
, "build_id": "f5f7ab96eac2cc53201f59b8d395b5a83b05fc11"
, "build_id_offset": 51828
, "function_name": "smbd_accept_connection"
, "file_name": "/usr/sbin/smbd"
}
, { "address": 139689783103195
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 44763
, "function_name": "epoll_event_loop_once"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783095975
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 37543
, "function_name": "std_event_loop_once"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783079117
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 20685
, "function_name": "_tevent_loop_once"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783079675
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 21243
, "function_name": "tevent_common_loop_wait"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 139689783095879
, "build_id": "b09c0391e7b5bbb6823fb8bf636e2af706e01c38"
, "build_id_offset": 37447
, "function_name": "std_event_loop_wait"
, "file_name": "/usr/lib64/libtevent.so.0.9.31"
}
, { "address": 94030456576661
, "build_id": "f5f7ab96eac2cc53201f59b8d395b5a83b05fc11"
, "build_id_offset": 31381
, "function_name": "main"
, "file_name": "/usr/sbin/smbd"
} ]
} ]
}