glibc detected *** nginx: master process /usr/sbin/nginx: double free or corruption (out) -- what???

Tue Jun 22 01:26:35 MSD 2010

Hi all,

I am getting entries like this in my nginx error log, and I have no idea 
what they might mean.

(I am also getting /phpmyadmin/index.php served as a file, and not 
passed to php-fastcgi, and they might be related).

Regards

Ian

*** glibc detected *** nginx: master process /usr/sbin/nginx: double 
free or corruption (out): 0x099b2fa8 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x17b591]
/lib/tls/i686/cmov/libc.so.6(+0x6cde8)[0x17cde8]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x17fecd]
nginx: master process /usr/sbin/nginx[0x80d9237]
[0x99a6cd0]
======= Memory map: ========
00110000-00263000 r-xp 00000000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00263000-00264000 ---p 00153000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00264000-00266000 r-xp 00153000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00266000-00267000 rwxp 00155000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00267000-0026a000 rwxp 00000000 00:00 0
0026a000-0027d000 r-xp 00000000 08:01 524399     
/lib/tls/i686/cmov/libnsl-2.11.1.so
0027d000-0027e000 r-xp 00012000 08:01 524399     
/lib/tls/i686/cmov/libnsl-2.11.1.so
0027e000-0027f000 rwxp 00013000 08:01 524399     
/lib/tls/i686/cmov/libnsl-2.11.1.so
0027f000-00281000 rwxp 00000000 00:00 0
002de000-002e4000 r-xp 00000000 08:01 524401     
/lib/tls/i686/cmov/libnss_compat-2.11.1.so
002e4000-002e5000 r-xp 00006000 08:01 524401     
/lib/tls/i686/cmov/libnss_compat-2.11.1.so
002e5000-002e6000 rwxp 00007000 08:01 524401     
/lib/tls/i686/cmov/libnss_compat-2.11.1.so
00339000-0033b000 rwxp 00000000 00:00 0
005a6000-005a7000 rwxp 00000000 00:00 0
005ce000-005e9000 r-xp 00000000 08:01 532090     /lib/ld-2.11.1.so
005e9000-005ea000 r-xp 0001a000 08:01 532090     /lib/ld-2.11.1.so
005ea000-005eb000 rwxp 0001b000 08:01 532090     /lib/ld-2.11.1.so
0099d000-009a7000 r-xp 00000000 08:01 524405     
/lib/tls/i686/cmov/libnss_files-2.11.1.so
009a7000-009a8000 r-xp 00009000 08:01 524405     
/lib/tls/i686/cmov/libnss_files-2.11.1.so
009a8000-009a9000 rwxp 0000a000 08:01 524405     
/lib/tls/i686/cmov/libnss_files-2.11.1.so
009b0000-009b1000 rwxs 00000000 00:04 11285      /dev/zero (deleted)
00b32000-00b33000 rwxp 00000000 00:00 0
00b9e000-00ba0000 r-xp 00000000 08:01 524353     
/lib/tls/i686/cmov/libdl-2.11.1.so
00ba0000-00ba1000 r-xp 00001000 08:01 524353     
/lib/tls/i686/cmov/libdl-2.11.1.so
00ba1000-00ba2000 rwxp 00002000 08:01 524353     
/lib/tls/i686/cmov/libdl-2.11.1.so
00bd2000-00bef000 r-xp 00000000 08:01 524373     /lib/libgcc_s.so.1
00bef000-00bf0000 r-xp 0001c000 08:01 524373     /lib/libgcc_s.so.1
00bf0000-00bf1000 rwxp 0001d000 08:01 524373     /lib/libgcc_s.so.1
00d3e000-00d47000 r-xp 00000000 08:01 524347     
/lib/tls/i686/cmov/libcrypt-2.11.1.so
00d47000-00d48000 r-xp 00008000 08:01 524347     
/lib/tls/i686/cmov/libcrypt-2.11.1.so
00d48000-00d49000 rwxp 00009000 08:01 524347     
/lib/tls/i686/cmov/libcrypt-2.11.1.so
00d49000-00d70000 rwxp 00000000 00:00 0
00e59000-00e61000 r-xp 00000000 08:01 524415     
/lib/tls/i686/cmov/libnss_nis-2.11.1.so
00e61000-00e62000 r-xp 00007000 08:01 524415     
/lib/tls/i686/cmov/libnss_nis-2.11.1.so
00e62000-00e63000 rwxp 00008000 08:01 524415     
/lib/tls/i686/cmov/libnss_nis-2.11.1.so
00f29000-00f2a000 r-xp 00000000 00:00 0          [vdso]
00f2a000-02f2a000 rwxs 00000000 00:04 11283      /dev/zero (deleted)
08048000-0820e000 r-xp 00000000 08:01 787713     /usr/sbin/nginx
0820e000-0820f000 r-xp 001c5000 08:01 787713     /usr/sbin/nginx
0820f000-0821f000 rwxp 001c6000 08:01 787713     /usr/sbin/nginx
0821f000-0822d000 rwxp 00000000 00:00 0
099a4000-099ec000 rwxp 00000000 00:00 0          [heap]
b7600000-b7621000 rwxp 00000000 00:00 0
b7621000-b7700000 ---p 00000000 00:00 0
bfd57000-bfd6c000 rwxp 00000000 00:00 0          [stack]
*** glibc detected *** nginx: master process /usr/sbin/nginx: double 
free or corruption (out): 0x09b26fa8 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x6ab591]
/lib/tls/i686/cmov/libc.so.6(+0x6cde8)[0x6acde8]
/lib/tls/i686/cmov/libc.so.6(cfree+0x6d)[0x6afecd]
nginx: master process /usr/sbin/nginx[0x80d9237]
[0x9b1acd0]
======= Memory map: ========
00110000-00111000 rwxs 00000000 00:04 12105      /dev/zero (deleted)
00111000-0012e000 r-xp 00000000 08:01 524373     /lib/libgcc_s.so.1
0012e000-0012f000 r-xp 0001c000 08:01 524373     /lib/libgcc_s.so.1
0012f000-00130000 rwxp 0001d000 08:01 524373     /lib/libgcc_s.so.1
002ff000-00300000 rwxp 00000000 00:00 0
0041e000-00431000 r-xp 00000000 08:01 524399     
/lib/tls/i686/cmov/libnsl-2.11.1.so
00431000-00432000 r-xp 00012000 08:01 524399     
/lib/tls/i686/cmov/libnsl-2.11.1.so
00432000-00433000 rwxp 00013000 08:01 524399     
/lib/tls/i686/cmov/libnsl-2.11.1.so
00433000-00435000 rwxp 00000000 00:00 0
00461000-00467000 r-xp 00000000 08:01 524401     
/lib/tls/i686/cmov/libnss_compat-2.11.1.so
00467000-00468000 r-xp 00006000 08:01 524401     
/lib/tls/i686/cmov/libnss_compat-2.11.1.so
00468000-00469000 rwxp 00007000 08:01 524401     
/lib/tls/i686/cmov/libnss_compat-2.11.1.so
0053e000-00559000 r-xp 00000000 08:01 532090     /lib/ld-2.11.1.so
00559000-0055a000 r-xp 0001a000 08:01 532090     /lib/ld-2.11.1.so
0055a000-0055b000 rwxp 0001b000 08:01 532090     /lib/ld-2.11.1.so
00635000-00636000 r-xp 00000000 00:00 0          [vdso]
00640000-00793000 r-xp 00000000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00793000-00794000 ---p 00153000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00794000-00796000 r-xp 00153000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00796000-00797000 rwxp 00155000 08:01 524339     
/lib/tls/i686/cmov/libc-2.11.1.so
00797000-0079a000 rwxp 00000000 00:00 0
00822000-0082c000 r-xp 00000000 08:01 524405     
/lib/tls/i686/cmov/libnss_files-2.11.1.so
0082c000-0082d000 r-xp 00009000 08:01 524405     
/lib/tls/i686/cmov/libnss_files-2.11.1.so
0082d000-0082e000 rwxp 0000a000 08:01 524405     
/lib/tls/i686/cmov/libnss_files-2.11.1.so
0091e000-00927000 r-xp 00000000 08:01 524347     
/lib/tls/i686/cmov/libcrypt-2.11.1.so
00927000-00928000 r-xp 00008000 08:01 524347     
/lib/tls/i686/cmov/libcrypt-2.11.1.so
00928000-00929000 rwxp 00009000 08:01 524347     
/lib/tls/i686/cmov/libcrypt-2.11.1.so
00929000-00950000 rwxp 00000000 00:00 0
00aa4000-00aac000 r-xp 00000000 08:01 524415     
/lib/tls/i686/cmov/libnss_nis-2.11.1.so
00aac000-00aad000 r-xp 00007000 08:01 524415     
/lib/tls/i686/cmov/libnss_nis-2.11.1.so
00aad000-00aae000 rwxp 00008000 08:01 524415     
/lib/tls/i686/cmov/libnss_nis-2.11.1.so
00b24000-00b26000 r-xp 00000000 08:01 524353     
/lib/tls/i686/cmov/libdl-2.11.1.so
00b26000-00b27000 r-xp 00001000 08:01 524353     
/lib/tls/i686/cmov/libdl-2.11.1.so
00b27000-00b28000 rwxp 00002000 08:01 524353     
/lib/tls/i686/cmov/libdl-2.11.1.so
00f0e000-00f0f000 rwxp 00000000 00:00 0
00f30000-00f32000 rwxp 00000000 00:00 0
00f32000-02f32000 rwxs 00000000 00:04 12103      /dev/zero (deleted)
08048000-0820e000 r-xp 00000000 08:01 787713     /usr/sbin/nginx
0820e000-0820f000 r-xp 001c5000 08:01 787713     /usr/sbin/nginx
0820f000-0821f000 rwxp 001c6000 08:01 787713     /usr/sbin/nginx
0821f000-0822d000 rwxp 00000000 00:00 0
09b18000-09b60000 rwxp 00000000 00:00 0          [heap]
b7700000-b7721000 rwxp 00000000 00:00 0
b7721000-b7800000 ---p 00000000 00:00 0
bfbca000-bfbdf000 rwxp 00000000 00:00 0          [stack]
*** glibc detected *** nginx: master process /usr/sbin/nginx: double 
free or corruption (out): 0x0875ffa8 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6(+0x6b591)[0x17b591]

etc for 3 more all slightly different.