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4a9be28c45
If the last NFSv3 unmount from a given host races with a mount from the
same host, we can destroy an nlm_host that is still in use.
Specifically nlmclnt_lookup_host() can increment h_count on
an nlm_host that nlmclnt_release_host() has just successfully called
refcount_dec_and_test() on.
Once nlmclnt_lookup_host() drops the mutex, nlm_destroy_host_lock()
will be called to destroy the nlmclnt which is now in use again.
The cause of the problem is that the dec_and_test happens outside the
locked region. This is easily fixed by using
refcount_dec_and_mutex_lock().
Fixes:
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.. | ||
clnt4xdr.c | ||
clntlock.c | ||
clntproc.c | ||
clntxdr.c | ||
host.c | ||
Makefile | ||
mon.c | ||
netns.h | ||
procfs.c | ||
procfs.h | ||
svc4proc.c | ||
svc.c | ||
svclock.c | ||
svcproc.c | ||
svcshare.c | ||
svcsubs.c | ||
xdr4.c | ||
xdr.c |