Re: signal 17 (SIGCHLD) received when used "secure authentication" in Thunderbird

[umask <umask@xxxxxxxxx>]

> On Mon, Jul 09, 2007 at 06:11:06PM +0400, umask wrote:

> > 09.07.07, 16:25, Igor Savchenko <dicsydel@xxxxxxxxx>:

> > 

> > > Hello umask,

> > 

> > > Monday, July 9, 2007, 3:21:25 PM, you wrote:

> > 

> > > > Видимо, это бага. Так ли?

> > 

> > > Попробуй сделать backtrace. gdb -p [ПИД Воркера]

> > 

> > > Далее делаешь так чтобы он вылетел. и пишешь backtrace

> > 

> > > То что получил кидаешь сюда.

> > 

> > 

> > У меня Linux (CentOS-5, i386). Завтра на работе сделаю strace и выложу его 
> > результат.

> strace не нужен. Нужно или посмотреть корку в gdb, или, как было предложено,

> backtrace в gdb на живом процессе в момент получения сигнала.

> В обоих случаях nginx должен быть собран с отладочной информацией (-g).



После запуска gdp на worker'а nginx'а выполнил ровно то, что приводило к 
SIGCHILD. Не знаю, так и должно быть, но после запуска на воркера gdb 
Thunderbird не подключался к POP3 (происходил таймаут).



Вот что получилось:



# gdb -p 4883

GNU gdb Red Hat Linux (6.5-16.el5rh)

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welcome to change it and/or distribute copies of it under certain conditions.

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This GDB was configured as "i386-redhat-linux-gnu".

Attaching to process 4883

Reading symbols from /opt/nginx/sbin/nginx...done.

Using host libthread_db library "/lib/libthread_db.so.1".

Reading symbols from /lib/libcrypt.so.1...done.

Loaded symbols for /lib/libcrypt.so.1

Reading symbols from /lib/libpcre.so.0...done.

Loaded symbols for /lib/libpcre.so.0

Reading symbols from /lib/libssl.so.6...done.

Loaded symbols for /lib/libssl.so.6

Reading symbols from /lib/libcrypto.so.6...done.

Loaded symbols for /lib/libcrypto.so.6

Reading symbols from /usr/lib/libz.so.1...done.

Loaded symbols for /usr/lib/libz.so.1

Reading symbols from /lib/libc.so.6...done.

Loaded symbols for /lib/libc.so.6

Reading symbols from /usr/lib/libgssapi_krb5.so.2...done.

Loaded symbols for /usr/lib/libgssapi_krb5.so.2

Reading symbols from /usr/lib/libkrb5.so.3...done.

Loaded symbols for /usr/lib/libkrb5.so.3

Reading symbols from /lib/libcom_err.so.2...done.

Loaded symbols for /lib/libcom_err.so.2

Reading symbols from /usr/lib/libk5crypto.so.3...done.

Loaded symbols for /usr/lib/libk5crypto.so.3

Reading symbols from /lib/libresolv.so.2...done.

Loaded symbols for /lib/libresolv.so.2

Reading symbols from /lib/libdl.so.2...done.

Loaded symbols for /lib/libdl.so.2

Reading symbols from /lib/ld-linux.so.2...done.

Loaded symbols for /lib/ld-linux.so.2

Reading symbols from /usr/lib/libkrb5support.so.0...done.

Loaded symbols for /usr/lib/libkrb5support.so.0

Reading symbols from /lib/libnss_files.so.2...done.

Loaded symbols for /lib/libnss_files.so.2

0x00da9402 in __kernel_vsyscall ()

(gdb) backtrace

#0  0x00da9402 in __kernel_vsyscall ()

#1  0x4a066778 in __epoll_wait_nocancel () from /lib/libc.so.6

#2  0x08062166 in ngx_epoll_process_events (cycle=0x84dc930, timer=4294967295, 

    flags=1) at src/event/modules/ngx_epoll_module.c:402

#3  0x080594fa in ngx_process_events_and_timers (cycle=0x84dc930)

    at src/event/ngx_event.c:245

#4  0x0805fbdd in ngx_worker_process_cycle (cycle=0x84dc930, data=0x0)

    at src/os/unix/ngx_process_cycle.c:747

#5  0x0805e601 in ngx_spawn_process (cycle=0x84dc930, 

    proc=0x805f54d <ngx_worker_process_cycle>, data=0x0, 

    name=0x809e857 "worker process", respawn=-2)

    at src/os/unix/ngx_process.c:187

#6  0x0805f0e6 in ngx_start_worker_processes (cycle=0x84dc930, n=1, type=-2)

    at src/os/unix/ngx_process_cycle.c:327

#7  0x0806014b in ngx_master_process_cycle (cycle=0x84dc930)

    at src/os/unix/ngx_process_cycle.c:119

#8  0x0804c07f in main (argc=1, argv=0xbf997cd4) at src/core/nginx.c:353