Hi,
I have an email system with more then 35000 accounts and that process arround
380000 messages a day on 4 servers. For more then an year I am facing random
hangs on the smtp server.
At a random time (may be hours, days or weeks) the main couriertcpd keeps
running and accepting connections (until the max clients are reached) but the
childs processess never ends.
Today I get some usefull strace outputs that may help to solve the problem.
The child process get locked on a infinity loop reading the smtpaccess.dat.
All the child couriertcpd I strace are on the same loop.
smtpaccess.dat was not modified.
The problem occour in all servers. I already reinstall some them. Some run
Debian 32bits, Some Debian 64bits. Some are fresh install, some are old
install. But the problem happens in all them.
I try to debug the source code to find where is the problema but it seems too
complex for me. May be you (Sam?) can help me on what I can to to solve this
problem?
Marcus
1) strace for a child couriertcpd process during normal operation
------------------------------------------------
17:46:05.482106 rt_sigaction(SIGCHLD, {SIG_DFL}, {0x404ae0, [CHLD],
SA_RESTORER|SA_RESTART, 0x7f4144f8af60}, 8) = 0
17:46:05.482278 rt_sigprocmask(SIG_UNBLOCK, [CHLD], NULL, 8) = 0
17:46:05.482683 brk(0x2503000) = 0x2503000
17:46:05.482974 brk(0x2524000) = 0x2524000
17:46:05.483454 brk(0x2545000) = 0x2545000
17:46:05.483729 lseek(4, 8192, SEEK_SET) = 8192
17:46:05.484210 read(4, "\0\0\0\0\r\0\0\0\31\0\0\0\271\3627
216.\2474\0\0\0\0\0\0\16\0\0\0\31"..., 4096) = 4096
17:46:05.484686 getsockname(5, {sa_family=AF_INET6, sin6_port=htons(25),
inet_pton(AF_INET6, "::ffff:74.86.76.42", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0}, [28]) = 0
17:46:05.485206 open("/etc/resolv.conf", O_RDONLY) = 6
.
.
. normal process end..
---------------------------------------------
2) strace for a child couriertcpd process while on start of the lock
----------------------------------------------
17:46:43.742191 rt_sigaction(SIGCHLD, {SIG_DFL}, {0x404ae0, [CHLD],
SA_RESTORER|SA_RESTART, 0x7f4144f8af60}, 8) = 0
17:46:43.743147 rt_sigprocmask(SIG_UNBLOCK, [CHLD], NULL, 8) = 0
17:46:43.748307 brk(0x2503000) = 0x2503000
17:46:43.753416 brk(0x2524000) = 0x2524000
17:46:43.753745 brk(0x2545000) = 0x2545000
17:46:43.754507 lseek(4, 8192, SEEK_SET) = 8192
17:46:43.754836 read(4, "201.17.129.83allow,SIZELIMIT=5242"..., 4096) = 1650
17:46:43.755069 read(4, ""..., 2446) = 0
17:46:43.756458 read(4, ""..., 2446) = 0
17:46:43.756556 read(4, ""..., 2446) = 0
17:46:43.756994 read(4, ""..., 2446) = 0
17:46:43.757080 read(4, ""..., 2446) = 0
17:46:43.757188 read(4, ""..., 2446) = 0
17:46:43.757276 read(4, ""..., 2446) = 0
17:46:43.757367 read(4, ""..., 2446) = 0
17:46:43.757452 read(4, ""..., 2446) = 0
17:46:43.757534 read(4, ""..., 2446) = 0
17:46:43.757617 read(4, ""..., 2446) = 0
17:46:43.757703 read(4, ""..., 2446) = 0
17:46:43.757794 read(4, ""..., 2446) = 0
17:46:43.757877 read(4, ""..., 2446) = 0
17:46:43.757960 read(4, ""..., 2446) = 0
17:46:43.758047 read(4, ""..., 2446) = 0
17:46:43.758155 read(4, ""..., 2446) = 0
17:46:43.758260 read(4, ""..., 2446) = 0
17:46:43.758570 read(4, ""..., 2446) = 0
17:46:43.758654 read(4, ""..., 2446) = 0
17:46:43.758762 read(4,
"\1\0\0\0\0\0\0\0\216\t\0\0\0\0\0\0r6\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2446)
= 2446
17:46:43.759082 getsockname(5, {sa_family=AF_INET6, sin6_port=htons(25),
inet_pton(AF_INET6, "::ffff:74.86.76.42", &sin6_addr), sin6_flowinfo=0,
sin6_scope_id=0}, [28]) = 0
17:46:43.759258 open("/etc/resolv.conf", O_RDONLY) = 6
.
.
.
. normal process end..
----------------------------------------------
3) strace for a child couriertcpd during the smtp hang
---------------------------------------------
17:46:49.944384 rt_sigaction(SIGCHLD, {SIG_DFL}, {0x404ae0, [CHLD],
SA_RESTORER|SA_RESTART, 0x7f4144f8af60}, 8) = 0
17:46:49.950918 rt_sigprocmask(SIG_UNBLOCK, [CHLD], NULL, 8) = 0
17:46:49.951420 brk(0x2503000) = 0x2503000
17:48:05.794865 brk(0x2524000) = 0x2524000
17:48:05.795256 brk(0x2545000) = 0x2545000
17:48:45.322594 lseek(4, 8192, SEEK_SET) = 8192
17:48:45.322770 read(4, "201.17.129.83allow,SIZELIMIT=5242"..., 4096) = 1650
17:48:45.322967 read(4, ""..., 2446) = 0
17:48:45.323220 read(4, ""..., 2446) = 0
17:48:45.323390 read(4, ""..., 2446) = 0
17:48:45.323529 read(4, ""..., 2446) = 0
17:48:45.323675 read(4, ""..., 2446) = 0
17:48:45.323812 read(4, ""..., 2446) = 0
17:48:45.323937 read(4, ""..., 2446) = 0
17:48:45.324074 read(4, ""..., 2446) = 0
17:48:45.324215 read(4, ""..., 2446) = 0
17:48:45.324377 read(4, ""..., 2446) = 0
.
.
. until I restart courier-mta
---------------------------------------------
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