Hello,
About once or twice a week, dovecot's imap-login process on my system seems gets out of control, eating 100% CPU for about 2 hours. Afterwards everything seems to go back to normal.
I am using Dovecot 2.1.7 on a 64 bit Debian wheezy system.
When running gdb on the process in this stage, I get the following traceback:
#0 0x00007fcba50c5a90 in read () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007fcba4aa01aa in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
#2 0x00007fcba4a9df09 in BIO_read () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.0.0
#3 0x00007fcba4dbac8c in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
#4 0x00007fcba4dbbe75 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
#5 0x00007fcba4dbd8d0 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
#6 0x00007fcba4dad07a in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
#7 0x00007fcba4db143b in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.0.0
#8 0x00007fcba5622b61 in ssl_handshake (proxy=0x7fcba7870bb0) at ssl-proxy-openssl.c:465
#9 ssl_step (proxy=0x7fcba7870bb0) at ssl-proxy-openssl.c:528
#10 0x00007fcba53d2016 in io_loop_call_io (io=0x7fcba786fc80) at ioloop.c:379
#11 0x00007fcba53d2cc7 in io_loop_handler_run (ioloop=ioloop@entry=0x7fcba778c6e0)
at ioloop-epoll.c:213
#12 0x00007fcba53d1a28 in io_loop_run (ioloop=0x7fcba778c6e0) at ioloop.c:398
#13 0x00007fcba53be483 in master_service_run (service=0x7fcba778c590,
callback=callback@entry=0x7fcba5620100
strace -tt says:
16:14:19.693378 gettimeofday({1381421659, 693415}, NULL) = 0
16:14:19.693490 time(NULL) = 1381421659
16:14:19.693588 read(18, 0x7fcba7876a43, 5) = -1 EAGAIN (Resource temporarily unavailable)
16:14:19.693688 epoll_wait(14, {{EPOLLOUT, {u32=2810463600, u64=140512665552240}}}, 10, 4294967295) = 1
16:14:19.693796 gettimeofday({1381421659, 693823}, NULL) = 0
16:14:19.693890 time(NULL) = 1381421659
16:14:19.693984 read(18, 0x7fcba7876a43, 5) = -1 EAGAIN (Resource temporarily unavailable)
16:14:19.694084 epoll_wait(14, {{EPOLLOUT, {u32=2810463600, u64=140512665552240}}}, 10, 4294967295) = 1
16:14:19.694177 gettimeofday({1381421659, 694203}, NULL) = 0
16:14:19.694269 time(NULL) = 1381421659
16:14:19.694399 read(18, 0x7fcba7876a43, 5) = -1 EAGAIN (Resource temporarily unavailable)
16:14:19.694563 epoll_wait(14, {{EPOLLOUT, {u32=2810463600, u64=140512665552240}}}, 10, 4294967295) = 1
16:14:19.694706 gettimeofday({1381421659, 694757}, NULL) = 0
16:14:19.694849 time(NULL) = 1381421659
16:14:19.694976 read(18, 0x7fcba7876a43, 5) = -1 EAGAIN (Resource temporarily unavailable)
16:14:19.695091 epoll_wait(14, {{EPOLLOUT, {u32=2810463600, u64=140512665552240}}}, 10, 4294967295) = 1
16:14:19.695201 gettimeofday({1381421659, 695230}, NULL) = 0
16:14:19.695300 time(NULL) = 1381421659
16:14:19.695420 read(18, 0x7fcba7876a43, 5) = -1 EAGAIN (Resource temporarily unavailable)
16:14:19.695555 epoll_wait(14,
dovecot -n output is:
# 2.1.7: /etc/dovecot/dovecot.conf # OS: Linux 3.2.0-4-amd64 x86_64 Debian 7.2 ext3 first_valid_uid = 8 last_valid_uid = 8 mail_access_groups = spamd-clients mail_gid = mail mail_location = mdbox:/var/spool/mail/%n/mdbox mail_plugins = fts quota fts_lucene mail_uid = 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 ihave namespace inbox { inbox = yes location = mailbox Drafts { special_use = \Drafts } mailbox Sent { special_use = \Sent } mailbox "Sent Messages" { special_use = \Sent } mailbox Spam { special_use = \Junk } mailbox Trash { special_use = \Trash } prefix = } passdb { args = scheme=SHA512-CRYPT username_format=%n /etc/dovecot/users driver = passwd-file } plugin { antispam_backend = pipe antispam_pipe_program = /usr/local/bin/spamc_wrapper antispam_pipe_program_notspam_args = -L;ham antispam_pipe_program_spam_args = -L;spam antispam_spam = Spam antispam_trash = Trash;Papierkorb fts = lucene fts_lucene = whitespace_chars=@. quota = dict:User quota::file:%h/quota quota_rule = *:storage=1G quota_rule2 = Trash:storage=+100M sieve = ~/.dovecot.sieve sieve_dir = ~/sieve } protocols = " imap lmtp sieve" service auth { unix_listener auth-client { mode = 0600 user = Debian-exim } } service lmtp { inet_listener lmtp { address = 127.0.0.1 port = 2003 } } service managesieve-login { inet_listener sieve { port = 4190 } process_min_avail = 0 service_count = 1 } ssl_cert =
Is this a bug in dovecot, or am I doing something wrong? Is there something I can do to debug this further?
Best, Nikolaus
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