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NFSv4: Don't exit the state manager without clearing NFS4CLNT_MANAGER_RUNNING

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commit 21a446cf18 upstream.

If we exit the NFSv4 state manager due to a umount, then we can end up
leaving the NFS4CLNT_MANAGER_RUNNING flag set. If another mount causes
the nfs4_client to be rereferenced before it is destroyed, then we end
up never being able to recover state.

Fixes: 47c2199b6e ("NFSv4.1: Ensure state manager thread dies on last ...")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: stable@vger.kernel.org # v4.15+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2018-11-05 11:10:50 -05:00 committed by Greg Kroah-Hartman
parent 03c91663c0
commit c355fb8d33
1 changed files with 5 additions and 3 deletions
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8
fs/nfs/nfs4state.c
View File

@ -2583,11 +2583,12 @@ static void nfs4_state_manager(struct nfs_client *clp)
nfs4_clear_state_manager_bit(clp);
/* Did we race with an attempt to give us more work? */
if (clp->cl_state == 0)
break;
return;
if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0)
break;
return;
} while (refcount_read(&clp->cl_count) > 1);
return;
goto out_drain;
out_error:
if (strlen(section))
section_sep = ": ";
@ -2595,6 +2596,7 @@ static void nfs4_state_manager(struct nfs_client *clp)
" with error %d\n", section_sep, section,
clp->cl_hostname, -status);
ssleep(1);
out_drain:
nfs4_end_drain_session(clp);
nfs4_clear_state_manager_bit(clp);
}