[LU-11904] jobid cache cleanup is not safe

Mon, 13 May 2019 22:05:08 +0000

jobid_cache_fini uses the jobid_hash_lock to protect the jobid_hash pointer:

spin_lock(&jobid_hash_lock);
tmp_hash = jobid_hash;
jobid_hash = NULL;
spin_unlock(&jobid_hash_lock);

But other places in the code use that pointer without holding the jobid_hash_lock (notably jobid_get_from_cache()).

This can cause unexpected behavior in those locations during unmount.

No plan to do a patch for this ATM.

Whamcloud Community JIRA