Ceph » CephFS

steps to reproduce mds stuck at reconnect state for mimic and later. (snap cache code gets confused)

- 2 active mds, assign mds to fixed ranks (mds_standby_for_rank config), no standby mds
- gdb attach mds.0, wait until 'ceph -w' shows it's laggy
- restart mds.1, wait until it enter resolve state.
- continue execution of mds.0

steps to reproduce mds stuck at resolve state for luminous. (Migrator::{import_reverse_discovering,import_reverse_discovered} do not call maybe_send_pending_resolves)

- 2 active mds, assign mds to fixed ranks (mds_standby_for_rank config), no standby mds,
- mkdir 1; setfattr -n ceph.dir.pin -v 1 1
- gdb attach mds.0, make break point at Migrator::handle_export_discover, continue execution
- setfattr -n ceph.dir.pin -v 0 1, wait until above break point gets triggered
- restart mds.1, wait until it enter resolve state.
- continue execution of mds.0