GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-110.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/libexec/mupdate...done.
[New LWP 31410]
[New LWP 31407]
[New LWP 31409]
[New LWP 31405]
[New LWP 31404]
[New LWP 31406]
[New LWP 31408]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `mupdate -m -C /etc/imapd_mu.conf'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007fb49c000098 in ?? ()
(gdb) 
Thread 7 (Thread 0x7fb4a32db700 (LWP 31408)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x0000000000405cd4 in thread_main (rock=0x0) at imap/mupdate.c:1142
#2  0x00007fb4a771add5 in start_thread (arg=0x7fb4a32db700) at pthread_create.c:308
#3  0x00007fb4a718fb3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 6 (Thread 0x7fb4a42dd700 (LWP 31406)):
#0  0x00007fb4a7186cd9 in __pselect (nfds=11, readfds=0x7fb4a42dcbf0, writefds=0x0, exceptfds=0x0, timeout=<optimized out>, sigmask=<optimized out>)
    at ../sysdeps/unix/sysv/linux/pselect.c:77
#1  0x00007fb4aa527fc2 in signals_select (nfds=11, rfds=0x7fb4a42dcbf0, wfds=0x0, efds=0x0, tout=0x0) at lib/signals.c:257
#2  0x00007fb4aa526483 in prot_select (readstreams=0x7fb49c0008c0, extra_read_fd=10, out=0x7fb4a42dcd28, extra_read_flag=0x7fb4a42dccfc, timeout=0x0) at lib/prot.c:1578
#3  0x0000000000405e6e in thread_main (rock=0x0) at imap/mupdate.c:1199
#4  0x00007fb4a771add5 in start_thread (arg=0x7fb4a42dd700) at pthread_create.c:308
#5  0x00007fb4a718fb3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7fb4acafb8c0 (LWP 31404)):
#0  0x00007fb4a7721a2d in accept () at ../sysdeps/unix/syscall-template.S:81
#1  0x000000000040a232 in main (argc=4, argv=0x7fff12ca3e38, envp=0x7fff12ca3e60) at master/service-thread.c:268

Thread 4 (Thread 0x7fb4a4ade700 (LWP 31405)):
#0  0x00007fb4a7721a2d in accept () at ../sysdeps/unix/syscall-template.S:81
#1  0x00000000004098fa in mupdate_placebo_kick_start (rock=0x0) at imap/mupdate-slave.c:351
#2  0x00007fb4a771add5 in start_thread (arg=0x7fb4a4ade700) at pthread_create.c:308
#3  0x00007fb4a718fb3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7fb4a2ada700 (LWP 31409)):
#0  0x00007fb4a7186cd9 in __pselect (nfds=16, readfds=0x7fb4a2ad9b50, writefds=0x0, exceptfds=0x0, timeout=<optimized out>, sigmask=<optimized out>)
    at ../sysdeps/unix/sysv/linux/pselect.c:77
#1  0x00007fb4aa527fc2 in signals_select (nfds=16, rfds=0x7fb4a2ad9b50, wfds=0x0, efds=0x0, tout=0x7fb4a2ad9bd0) at lib/signals.c:257
#2  0x00007fb4aa52429e in prot_fill (s=0x7fb4940013f0) at lib/prot.c:730
#3  0x00007fb4aa7f52f8 in getword (in=0x7fb4940013f0, buf=0x7fb494001338) at imap/imapparse.c:70
#4  0x00000000004048ad in docmd (c=0x7fb4940009f0) at imap/mupdate.c:677
#5  0x00000000004062af in thread_main (rock=0x0) at imap/mupdate.c:1329
#6  0x00007fb4a771add5 in start_thread (arg=0x7fb4a2ada700) at pthread_create.c:308
#7  0x00007fb4a718fb3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fb4a3adc700 (LWP 31407)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x0000000000405cd4 in thread_main (rock=0x0) at imap/mupdate.c:1142
#2  0x00007fb4a771add5 in start_thread (arg=0x7fb4a3adc700) at pthread_create.c:308
#3  0x00007fb4a718fb3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fb4a22d9700 (LWP 31410)):
#0  0x00007fb49c000098 in ?? ()
#1  0x00007fb4a9a59a85 in DH_free (r=0x7fb49c1b9600) at dh_lib.c:194
#2  0x00007fb4aa84dbef in tls_shutdown_serverengine () at imap/tls.c:1311
#3  0x0000000000404075 in conn_free (C=0x7fb4840009f0) at imap/mupdate.c:379
#4  0x00000000004062c0 in thread_main (rock=0x0) at imap/mupdate.c:1330
#5  0x00007fb4a771add5 in start_thread (arg=0x7fb4a22d9700) at pthread_create.c:308
#6  0x00007fb4a718fb3d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113
(gdb) quit