[Bug nscd/10402] New: nscd locking severely broken

["pasky at suse dot cz" <sourceware-bugzilla at sourceware dot org>]

The commit 20e498bd removes the pthread_mutex_rdlock() calls, but not the
corresponding pthread_mutex_unlock() calls. Also, the database lock is never
unlocked in one branch of the mempool_alloc() if.

I think unreproducible random assert(dh->usable) crashes in prune_cache() were
caused by this. But an easy way to make nscd threads hang with the broken
locking was

  while true; do id root; id tttest; nscd -i passwd; done

-- 
           Summary: nscd locking severely broken
           Product: glibc
           Version: 2.10
            Status: NEW
          Severity: critical
          Priority: P2
         Component: nscd
        AssignedTo: drepper at redhat dot com
        ReportedBy: pasky at suse dot cz
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=10402

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