[Dovecot] dovecot-imapd eating 100% cpu every once in a while
Robert Schetterer
rs at sys4.de
Wed Dec 11 20:28:18 EET 2013
Am 11.12.2013 18:39, schrieb Timo Sirainen:
> Hmh. Can you try if this patch fixes it? http://hg.dovecot.org/dovecot-2.2/rev/c0236d1c4a04
patch is for 2.2.x , so he has to do total upgrade
>
> On 11.12.2013, at 19.10, Nikolaus Rath <Nikolaus at rath.org> wrote:
>
>> 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.«
>>
>
Best Regards
MfG Robert Schetterer
--
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