[Dovecot] dovecot-imapd eating 100% cpu every once in a while
Nikolaus Rath
Nikolaus at rath.org
Wed Dec 11 19:10:36 EET 2013
Hello,
*ping*
Really no one able to help with the issue below?
Best,
Nikolaus
Nikolaus Rath <Nikolaus at rath.org> writes:
> 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 at 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 at entry=0x7fcba5620100 <client_connected>) at master-service.c:544
> #14 0x00007fcba562079e in login_binary_run (binary=<optimized out>, argc=1, argv=0x7fcba778c370)
> at main.c:406
> #15 0x00007fcba5015ead in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
> #16 0x00007fcba5a52b2d in _start ()
>
> 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, <unfinished ...>
>
> 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 = </etc/dovecot/dovecot.pem
> ssl_key = </etc/dovecot/private/dovecot.pem
> userdb {
> args = username_format=%n /etc/dovecot/users
> driver = passwd-file
> override_fields = home=/var/spool/mail/%n
> }
> protocol lmtp {
> mail_plugins = fts quota fts_lucene sieve
> }
> protocol lda {
> mail_plugins = fts quota fts_lucene sieve
> }
> protocol imap {
> mail_max_userip_connections = 50
> mail_plugins = fts quota fts_lucene imap_quota antispam
> }
>
>
> Is this a bug in dovecot, or am I doing something wrong? Is there
> something I can do to debug this further?
>
>
> Best,
> Nikolaus
>
> --
> Encrypted emails preferred.
> PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C
>
> »Time flies like an arrow, fruit flies like a Banana.«
--
Encrypted emails preferred.
PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C
»Time flies like an arrow, fruit flies like a Banana.«
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