[krbdev.mit.edu #6078] destroying locked mutex

[Ken Raeburn via RT]

We should check NetBSD results more often; they're currently reporting  
assertion failures in the thread library for a lot of our test  
programs, though the core files I've looked at so far aren't giving me  
terribly useful stack traces.  Here's one example from a program run  
under gdb with no particular environment setup:

(gdb) run ATHENA.MIT.EDU
Starting program: /usr/home/krbsnap/autobuild-shared/ 
work-20080814.0500/krb5-current/src/lib/krb5/os/t_locate_kdc  
ATHENA.MIT.EDU
t_locate_kdc: Error detected by libpthread: Destroying locked mutex.
Detected by file "/home/builds/ab/netbsd-3-0-RELEASE/src/lib/ 
libpthread/pthread_mutex.c", line 135, function "pthread_mutex_destroy".
See pthread(3) for information.

Program received signal SIGABRT, Aborted.
[Switching to LWP 1]
0x000000016022d860 in kill () from /usr/lib/libc.so.12
(gdb) bt
#0  0x000000016022d860 in kill () from /usr/lib/libc.so.12
#1  0x00000001601e4968 in pthread__errorfunc () from /usr/lib/ 
libpthread.so.0
#2  0x00000001601dfd38 in pthread_mutex_destroy ()
    from /usr/lib/libpthread.so.0
#3  0x00000001600f3ebc in profile_free_file_data (data=0x120020200)
     at prof_file.c:602
#4  0x00000001600f334c in profile_dereference_data (data=0x120020200)
     at prof_file.c:547
#5  0x00000001600f3be4 in profile_free_file (prf=0x12001c0e0)
     at prof_file.c:570
#6  0x00000001600f4328 in profile_close_file (prf=0x12001c0e0)
     at prof_file.c:613
#7  0x00000001600eff54 in profile_open_file (filespec=0x120020200 "",
     ret_prof=0x1ffffea00) at prof_file.c:297
#8  0x00000001600f8c0c in profile_init (files=0x0,  
ret_profile=0x12001a048)
     at prof_init.c:43
#9  0x00000001600e5164 in os_init_paths (ctx=0x12001a000, kdc=0)
     at init_os_ctx.c:343
#10 0x00000001600e5214 in krb5_os_init_context (ctx=0x12001a000, kdc=6)
     at init_os_ctx.c:397