Nginx stuck processes

[Sandesh K.]

Hi,

We are using nginx version: 1.0.0 for pop-proxy. We have seen off-late
certain processes remaining in state whereby nginx becomes
non-responsive.

Below is the dump of ps showing the stuck process of nginx ==> R -->
4150:24.

i have shared the gdb dump and the backtrace of the stuck process.

38487 ?        S      0:00 nginx: master process
/usr/local/nginx/sbin/nginx -c /etc/nginx/conf/nginx.conf
 7044 ?        R    4150:24  \_ nginx: worker process
22408 ?        S      0:03 /usr/local/apache3/sbin/httpd
22461 ?        S      4:25  \_ /usr/local/apache3/sbin/httpd
27699 ?        D      0:00  |   \_
/home/httpd/dal/cgi-bin/dal/rmailajax.cgi
15853 ?        S      0:06  \_ /usr/local/apache3/sbin/httpd
17290 ?        S      0:05  \_ /usr/local/apache3/sbin/httpd
22796 ?        S      0:04 /usr/sbin/httpd -DSSL
22801 ?        S      0:29  \_ /usr/sbin/httpd -DSSL
20605 ?        S      4:05  \_ /usr/sbin/httpd -DSSL
19391 ?        S      2:33  \_ /usr/sbin/httpd -DSSL
60469 ?        S      0:59  \_ /usr/sbin/httpd -DSSL
 3437 ?        S      0:35  \_ /usr/sbin/httpd -DSSL
11200 ?        S      0:30  \_ /usr/sbin/httpd -DSSL
16597 ?        S      0:19  \_ /usr/sbin/httpd -DSSL
19556 ?        S      0:09  \_ /usr/sbin/httpd -DSSL
27218 ?        S      0:00  \_ /usr/sbin/httpd -DSSL

[root at xxx logs]# strace
[root at xxx logs]# gdb
GNU gdb Red Hat Linux (6.3.0.0-0.30.1rh)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you
are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "i386-redhat-linux-gnu".
(gdb) attach 7044
Attaching to process 7044
Reading symbols from /usr/local/nginx/sbin/nginx...done.
Using host libthread_db library "/lib/tls/libthread_db.so.1".
Reading symbols from /lib/libcrypto.so.4...done.
Loaded symbols for /lib/libcrypto.so.4
Reading symbols from /lib/tls/libc.so.6...done.
Loaded symbols for /lib/tls/libc.so.6
Reading symbols from /usr/kerberos/lib/libgssapi_krb5.so.2...done.
Loaded symbols for /usr/kerberos/lib/libgssapi_krb5.so.2
Reading symbols from /usr/kerberos/lib/libkrb5.so.3...done.
Loaded symbols for /usr/kerberos/lib/libkrb5.so.3
Reading symbols from /usr/kerberos/lib/libcom_err.so.3...done.
Loaded symbols for /usr/kerberos/lib/libcom_err.so.3
Reading symbols from /usr/kerberos/lib/libk5crypto.so.3...done.
Loaded symbols for /usr/kerberos/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 /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libnss_files.so.2...done.
Loaded symbols for /lib/libnss_files.so.2
0x001dbb74 in _int_malloc () from /lib/tls/libc.so.6
(gdb) backtrace
#0  0x001dbb74 in _int_malloc () from /lib/tls/libc.so.6
#1  0x001dc89c in _int_memalign () from /lib/tls/libc.so.6
#2  0x001db2c7 in memalign () from /lib/tls/libc.so.6
#3  0x001dd367 in posix_memalign () from /lib/tls/libc.so.6
#4  0x0805d614 in ngx_memalign (alignment=16, size=2746520, log=0x108)
at src/os/unix/ngx_alloc.c:56
#5  0x0804b603 in ngx_create_pool (size=256, log=0x93bd1a0) at
src/core/ngx_palloc.c:20
#6  0x0805be26 in ngx_event_accept (ev=0x93df338) at
src/event/ngx_event_accept.c:124
#7  0x0805b7f9 in ngx_event_process_posted (cycle=0x93bce28,
posted=0x8070e3c) at src/event/ngx_event_posted.c:39
#8  0x0805a8e1 in ngx_process_events_and_timers (cycle=0x93bce28) at
src/event/ngx_event.c:253
#9  0x0806051a in ngx_worker_process_cycle (cycle=0x93bce28, data=0x0)
at src/os/unix/ngx_process_cycle.c:800
#10 0x0805eb3c in ngx_spawn_process (cycle=0x93bce28, proc=0x8060465
<ngx_worker_process_cycle>, data=0x0, name=0x806b971 "worker process",
respawn=17)
    at src/os/unix/ngx_process.c:196
#11 0x0806023e in ngx_reap_children (cycle=0x93bce28) at
src/os/unix/ngx_process_cycle.c:617
#12 0x0805f8e1 in ngx_master_process_cycle (cycle=0x93bce28) at
src/os/unix/ngx_process_cycle.c:180
#13 0x08049fea in main (argc=3, argv=0x93bd5a4) at src/core/nginx.c:405

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