Help! Cyrus 2.5.11 segmentation fault

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Hello,
we have a Cyrus 2.5.11 on Debian 7 using murder (2 frontends, 3 backends, 1 mupdate, about  5000 mailboxes) in production environment, hosted by a VMware cluster 6.5.

Suddenly, ALL mailboxes have becomed inaccessible.

In the log, we found many messages like this:

   master[5965]: process type:SERVICE name:imaps path:/usr/cyrus/bin/proxyd age:82.255s pid:5987 signaled to death by signal 11 (Segmentation fault)

I tried many times to restart the cyrus service on all servers without success.

Users are authenticated correctly, error occurs when they try to access the mailbox (trying with a manual connection using telnet, client dies on a "SELECT INBOX" command after a successfull login)

This is the output of one core dump:

    Core was generated by `proxyd -s'.
Program terminated with signal 11, Segmentation fault.
#0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:32
32        ../sysdeps/x86_64/multiarch/../strlen.S: File o directory non esistente.
(gdb) bt
#0  __strlen_sse2 () at ../sysdeps/x86_64/multiarch/../strlen.S:32
#1  0x00007f58caffa656 in xstrdup (str=0x0) at lib/xmalloc.c:95
#2  0x00007f58cb574b93 in parse_capability (s=s@entry=0x2223580, str=<optimized out>) at imap/backend.c:282 #3  0x00007f58cb576362 in parse_capability (str=<optimized out>, s=0x2223580) at imap/backend.c:279 #4  backend_login (noauth=6486368, auth_status=0x0, cb=0x2233b20, userid=0x2235360 "xxxx", ret=0x2223580) at imap/backend.c:833 #5  backend_connect (ret_backend=ret_backend@entry=0x0, server=0xc <Address 0xc out of bounds>, server@entry=0x2233d90 "imap2", prot=0x7ffccb275a40, prot@entry=0x62f840,     userid=userid@entry=0x2235360 "xxxx", cb=0x2233b20, cb@entry=0x0, auth_status=auth_status@entry=0x0, logfd=logfd@entry=-1) at imap/backend.c:1027 #6  0x0000000000425915 in proxy_findserver (server=0x2233d90 "imap2", prot=prot@entry=0x62f840, userid=0x2235360 "xxxx", cache=0x62fb70, current=0x62fb78, inbox=0x62fb80, clientin=0x21ed470)
    at imap/proxy.c:173
#7  0x0000000000417a0d in proxy_findinboxserver (userid=<optimized out>) at imap/imap_proxy.c:129 #8  0x0000000000412f63 in cmd_list (tag=0x221ad00 "6", listargs=listargs@entry=0x7ffccb276a60) at imap/imapd.c:6728
#9  0x0000000000420afc in cmdloop () at imap/imapd.c:1638
#10 0x0000000000424f4e in service_main (argc=<optimized out>, argv=<optimized out>, envp=envp@entry=0x7ffccb27a9e0) at imap/imapd.c:984 #11 0x0000000000416962 in main (argc=<optimized out>, argv=<optimized out>, envp=0x7ffccb27a9e0) at master/service.c:606
(gdb)

Any suggestions or support?


Greetings,
Marco

--
Marco Chesi
Ufficio Esercizio e Tecnologie
Area Organizzazione e Sistemi Informativi
Università degli Studi di Siena

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