Nginx core dump

Server NGINX
1

Hi

We are using the nginx imap mail module and we are seeing coredumps

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Core was generated by `nginx’.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /home/y/lib/libssl.so.3…done.
Loaded symbols for /home/y/lib/libssl.so.3
Reading symbols from /home/y/lib/libcrypto.so.3…done.
Loaded symbols for /home/y/lib/libcrypto.so.3
Reading symbols from /usr/lib32/compat/libc.so.4…done.
Loaded symbols for /usr/lib32/compat/libc.so.4
Reading symbols from /libexec/ld-elf32.so.1…done.
Loaded symbols for /libexec/ld-elf32.so.1
#0 0x0101f169 in ngx_ssl_write (c=0x1098040,
data=0xffffffff , size=20532628)
at src/event/ngx_event_openssl.c:1079
1079 src/event/ngx_event_openssl.c: No such file or directory.
in src/event/ngx_event_openssl.c
(gdb) bt
#0 0x0101f169 in ngx_ssl_write (c=0x1098040,
data=0xffffffff , size=20532628)
at src/event/ngx_event_openssl.c:1079
#1 0x01022345 in ngx_mail_send (wev=0x1396e28)
at src/mail/ngx_mail_handler.c:559
#2 0x01025ad6 in ngx_mail_imap_auth_state (rev=0x126ae28)
at src/mail/ngx_mail_imap_handler.c:360
#3 0x0101dcd9 in ngx_kqueue_process_events (cycle=0x1050028, timer=500,

flags=1) at src/event/modules/ngx_kqueue_module.c:689

#4 0x01014ca9 in ngx_process_events_and_timers (cycle=0x1050028)
at src/event/ngx_event.c:245
#5 0x0101b969 in ngx_worker_process_cycle (cycle=0x1050028, data=0x0)
at src/os/unix/ngx_process_cycle.c:791
#6 0x01019ee7 in ngx_spawn_process (cycle=0x1050028,
proc=0x101b89c , data=0x0,
name=0x1030d3e “worker process”, respawn=Cannot access memory at
address 0xffffdc18
) at src/os/unix/ngx_process.c:194
#7 0x0101b66d in ngx_reap_children (cycle=0x1050028)
at src/os/unix/ngx_process_cycle.c:612
#8 0x0101abbb in ngx_master_process_cycle (cycle=0x1050028)
at src/os/unix/ngx_process_cycle.c:180
#9 0x0100350a in main (argc=3, argv=0xffffde40) at
src/core/nginx.c:396

'any ideas on debugging this?

thanks!

Posted at Nginx Forum:

2

-bash-3.2$ nginx -V
nginx version: nginx/0.7.65
built by gcc 2.95.3 20010315 (release)
TLS SNI support disabled
configure arguments: --prefix=/home/y
–conf-path=/home/y/conf/ymail_nginx/nginx.conf
–pid-path=/home/y/var/run/ymail_nginx.pid
–lock-path=/home/y/var/run/ymail_nginx.lock
–error-log-path=/home/y/logs/ymail_nginx/error.log --without-http
–without-http_rewrite_module --with-mail --with-mail_ssl_module
–with-debug --user=nobody --with-cc=/home/y/bin/gcc
–with-cc-opt=-I/home/y/include --with-ld-opt=‘-L/home/y/lib -Wl,-rpath
/home/y/lib’

Posted at Nginx Forum:

3

Hello!

On Wed, Sep 01, 2010 at 06:20:42PM -0400, iceman wrote:

We are using the nginx imap mail module and we are seeing coredumps

[…]

(gdb) bt
#0 0x0101f169 in ngx_ssl_write (c=0x1098040,
data=0xffffffff , size=20532628)
at src/event/ngx_event_openssl.c:1079
#1 0x01022345 in ngx_mail_send (wev=0x1396e28)
at src/mail/ngx_mail_handler.c:559
#2 0x01025ad6 in ngx_mail_imap_auth_state (rev=0x126ae28)
at src/mail/ngx_mail_imap_handler.c:360

In 0.7.65 (as you claim in next message)
src/mail/ngx_mail_imap_handler.c:360 isn’t in
ngx_mail_imap_auth_state() function, it’s in
ngx_mail_imap_authenticate(). And the only call to
ngx_mail_send() in ngx_mail_imap_auth_state() is at line 298.

Do you have any patches applied?

Maxim D.

4

yes we have some changes.

#6 0x01019ee7 in ngx_spawn_process (cycle=0x1050028,
proc=0x101b89c , data=0x0,
name=0x1030d3e “worker process”, respawn=Cannot access memory at
address 0xffffdbf8

what does this mean? is this similar to
http://nginx.org/pipermail/nginx-ru/2009-October/029210.html

i can give you the dumps of any variables you would like us to examine.

thanks again for your help

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,126146,126190#msg-126190