Hi, always when my server is on high load I saw this errors on logs:
curie:~# uptime 10:22:38 up 19 days, 19:19, 2 users, load average: 207.01, 169.27, 94.41
Sep 15 17:00:26 curie dovecot: imap-login: *** glibc detected *** imap-login: malloc(): memory corruption: 0x00000000009f8560 *** Sep 15 17:00:26 curie dovecot: child 24012 (login) killed with signal 6 Sep 15 18:48:36 curie dovecot: auth(default_with_listener): BUG: Authentication client said it's PID 0 Sep 15 18:48:36 curie dovecot: child 24014 (login) killed with signal 11 Sep 16 09:05:19 curie dovecot: imap-login: *** glibc detected *** imap-login: malloc(): memory corruption: 0x00000000008c4bc0 *** Sep 16 09:05:19 curie dovecot: child 24013 (login) killed with signal 6 Sep 16 10:17:14 curie dovecot: imap-login: *** glibc detected *** imap-login: malloc(): memory corruption: 0x000000000098bb30 *** Sep 16 10:17:14 curie dovecot: child 24015 (login) killed with signal 6 Sep 16 10:19:02 curie dovecot: child 24002 (login) killed with signal 6 Sep 16 10:19:02 curie dovecot: managesieve-login: *** glibc detected *** managesieve-login: double free or corruption (!prev): 0x000000000066d700 ***
Sep 16 10:19:18 curie dovecot: Panic: IMAP(geduardo): file maildir-save.c: line 241 (maildir_get_updated_filename): assertion failed: (ctx->keywords_sync_ctx != NULL || mf->keywords_count == 0) Sep 16 10:19:18 curie dovecot: IMAP(geduardo): Raw backtrace: /usr/libexec/dovecot/imap [0x47a7f2] -> /usr/libexec/dovecot/imap [0x47a863] -> /usr/libexec/dovecot/imap [0x479f16] -> /usr/libexec/dovecot/imap [0x43295b] -> /usr/libexec/dovecot/imap(maildir_transaction_save_commit_pre+0x19a) [0x4331ea] -> /usr/libexec/dovecot/imap [0x42d0b7] -> /usr/libexec/dovecot/imap(index_transaction_commit+0x3f) [0x44b16f] -> /usr/lib/dovecot/imap/lib10_quota_plugin.so [0x2b70f72e90d7] -> /usr/libexec/dovecot/imap(cmd_copy+0x344) [0x4181f4] -> /usr/libexec/dovecot/imap(cmd_uid+0x52) [0x41c072] -> /usr/libexec/dovecot/imap [0x41ca4c] -> /usr/libexec/dovecot/imap [0x41cb02] -> /usr/libexec/dovecot/imap [0x41d2cf] -> /usr/libexec/dovecot/imap(client_input+0x63) [0x41d503] -> /usr/libexec/dovecot/imap(io_loop_handler_run+0xf8) [0x481448] -> /usr/libexec/dovecot/imap(io_loop_run+0x1d) [0x4805ad] -> /usr/libexec/dovecot/imap(main+0x3c2) [0x424962] -> /lib/libc.so.6(__libc_start_main+0xe6) [0x2b70f6d9e1a6] -> /usr/libexec/dovecot Sep 16 10:19:18 curie dovecot: child 20481 (imap) killed with signal 6
I have about 1000 users. To me, this is not a problem, nothing strange occurs (except the slowly, but under heavy load this is normal).
But I think this is interesting to developers... :D
Regards.