https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=925961

-------- Forwarded Message -------- Subject: segfault in libdovecot-storage at unknown circumstances Date: Fri, 29 Mar 2019 16:34:15 +0300 From: sergio <sergio+it@outerface.net> To: Debian Bug Tracking System <submit@bugs.debian.org>

Package: dovecot-core Version: 1:2.3.4.1-1~bpo9+1 Severity: normal

Yes, I know this is not very informative. I've already set ALLOW_COREDUMPS to 1 in /etc/default/dovecot and waiting for the next fault.

% grep segfa kern.log* kern.log.1: Mar 17 13:27:09 mail kernel: [118616.482998] imap[31111]: segfault at 8 ip 00007efbff924cbb sp 00007fff0b333890 error 4 in libdovecot-storage.so.0.0.0[7efbff858000+145000]

% zgrep segfa kern.log*gz kern.log.2.gz:Mar 15 01:51:07 mail kernel: [1691560.449110] imap[8329]: segfault at 8 ip 00007ff38ae2390e sp 00007ffcd3317640 error 4 kern.log.2.gz:Mar 15 01:51:07 mail kernel: [1691560.449117] imap[8380]: segfault at 8 ip 00007fea0c1c890e sp 00007ffdc7607150 error 4 in libdovecot-storage.so.0.0.0[7fea0c10d000+12c000] kern.log.2.gz:Mar 15 01:51:07 mail kernel: [1691560.449438] imap[8371]: segfault at 8 ip 00007f4775b0490e sp 00007ffce2814cc0 error 4 in libdovecot-storage.so.0.0.0[7f4775a49000+12c000] kern.log.2.gz:Mar 15 01:51:07 mail kernel: [1691560.461685] imap[2435]: segfault at 8 ip 00007fa8cb0ab90e sp 00007ffc4185e130 error 4 in libdovecot-storage.so.0.0.0[7fa8caff0000+12c000] kern.log.3.gz:Mar 13 02:35:33 mail kernel: [1521426.802606] imap[11824]: segfault at 8 ip 00007fa1b95d290e sp 00007ffd935de700 error 4 kern.log.3.gz:Mar 13 02:35:33 mail kernel: [1521426.802614] imap[11827]: segfault at 8 ip 00007f1afe53490e sp 00007fffbeb753d0 error 4 in libdovecot-storage.so.0.0.0[7f1afe479000+12c000] kern.log.3.gz:Mar 13 02:35:33 mail kernel: [1521426.802983] imap[11837]: segfault at 8 ip 00007f70b5c9b90e sp 00007ffd7f80bc80 error 4 in libdovecot-storage.so.0.0.0[7f70b5be0000+12c000]

% grep 'signal 11' mail.err* mail.err.1: Mar 17 13:27:09 mail dovecot: imap(sergio)<31111><lLOIej6EEN1Pht53>: Fatal: master: service(imap): child 31111 killed with signal 11 (core dumps disabled - https://dovecot.org/bugreport.html#coredumps)

% zgrep 'signal 11' mail.err* mail.err.1:Mar 17 13:27:09 mail dovecot: imap(sergio)<31111><lLOIej6EEN1Pht53>: Fatal: master: service(imap): child 31111 killed with signal 11 (core dumps disabled - https://dovecot.org/bugreport.html#coredumps) mail.err.2.gz:Mar 15 01:51:07 mail dovecot: imap(sergio): Fatal: master: service(imap): child 8371 killed with signal 11 (core dumps disabled) mail.err.2.gz:Mar 15 01:51:07 mail dovecot: imap(sergio): Fatal: master: service(imap): child 8380 killed with signal 11 (core dumps disabled) mail.err.2.gz:Mar 15 01:51:07 mail dovecot: imap(sergio): Fatal: master: service(imap): child 8329 killed with signal 11 (core dumps disabled) mail.err.2.gz:Mar 15 01:51:07 mail dovecot: imap(sergio): Fatal: master: service(imap): child 2435 killed with signal 11 (core dumps disabled) mail.err.3.gz:Mar 13 02:35:33 mail dovecot: imap(sergio): Fatal: master: service(imap): child 11827 killed with signal 11 (core dumps disabled) mail.err.3.gz:Mar 13 02:35:33 mail dovecot: imap(sergio): Fatal: master: service(imap): child 11837 killed with signal 11 (core dumps disabled) mail.err.3.gz:Mar 13 02:35:33 mail dovecot: imap(sergio): Fatal: master: service(imap): child 11824 killed with signal 11 (core dumps disabled)

% s dovecot -n # 2.3.4.1 (f79e8e7e4): /etc/dovecot/dovecot.conf # Pigeonhole version 0.5.4 () doveconf: Warning: service auth { client_limit=1000 } is lower than required under max. load (1324) doveconf: Warning: service anvil { client_limit=1000 } is lower than required under max. load (1227) # OS: Linux 4.9.0-8-amd64 x86_64 Debian 9.8 ext4 # Hostname: mail.outerface.net auth_verbose = yes lda_mailbox_autocreate = yes lda_mailbox_autosubscribe = yes lmtp_rcpt_check_quota = yes lmtp_save_to_detail_mailbox = yes mail_home = /var/mail/%u mail_location = sdbox:/var/mail/%u mail_plugins = quota fts virtual mail_privileged_group = mail managesieve_notify_capability = mailto managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date index ihave duplicate mime foreverypart extracttext spamtest spamtestplus namespace { location = virtual:~/mailboxes/virtual prefix = virtual/ separator = / } namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Junk { special_use = \Junk } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { special_use = \Junk } mailbox Trash { special_use = \Trash } prefix = } passdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } plugin { fts_autoindex = yes quota = count:User quota quota_grace = 10%% quota_rule = *:storage=2G quota_vsizes = yes sieve = file:~/sieve;active=~/.dovecot.sieve sieve_extensions = +spamtest +spamtestplus sieve_global = /etc/dovecot/sieve/ sieve_spamtest_max_value = 120 sieve_spamtest_status_header = X-Spam_score_int sieve_spamtest_status_type = score } protocols = " imap lmtp sieve" service auth-worker { user = $default_internal_user } service auth { unix_listener auth-client { mode = 0666 user = mail } } service imap-login { inet_listener imaps { port = 0 } process_limit = 1024 service_count = 1 vsz_limit = 64 M } service imap { process_limit = 1024 } ssl = required ssl_cert = </etc/ssl/localcerts/outerface.net-cert.pem ssl_cipher_list = ECDHE-ECDSA-AES256-GCM-SHA384 ssl_client_ca_dir = /etc/ssl/certs ssl_key = # hidden, use -P to show it ssl_min_protocol = TLSv1.2 userdb { driver = prefetch } userdb { args = /etc/dovecot/dovecot-ldap.conf.ext driver = ldap } protocol lmtp { mail_fsync = optimized mail_plugins = quota fts virtual sieve } protocol lda { mail_fsync = optimized } protocol imap { mail_max_userip_connections = 128 mail_plugins = quota fts virtual imap_zlib quota }

-- sergio.