Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tuto:linux:core_dump [2010/06/24 20:01] – créée root
+++ tuto:linux:core_dump [2010/06/24 20:33] (Version actuelle) – root
@@ Ligne 5: / Ligne 5: @@
 Et pour rendre les changement effectifs :
- sysctl kernel/core_pattern=%e.core
+  sysctl kernel/core_pattern=%e.core
+  * %%  Le caractere %
+  * %p  PID du processus  dumpe
+  * %u  UID reel du processus  dumpe
+  * %g  GID reel du processus  dumpe
+  * %s  Numero du signal ayant provoque le  dump
+  * %t  Heure du  dump  (secondes depuis le 1er janvier 1970, 00H00)
+  * %h  Nom d'hote (pareil que 'nodename' renvoye par uname(2))
+  * %e  Nom du fichier executable
 Si vous n'avez pas sysctl :
@@ Ligne 11: / Ligne 20: @@
 On se reconnecte et on teste :
-  zsh: abort (core dumped)  ./a.out
+<code>
-  gdb ./a.out a.out.core
+zsh: abort (core dumped)  ./core
-  ....
+snow-sip > gdb vxmld /var/snowshore/log/core
+warning: .dynamic section for "/lib/tls/libpthread.so.0" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+warning: .dynamic section for "/lib/tls/librt.so.1" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+warning: .dynamic section for "/usr/lib/libxml2.so.2" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+warning: .dynamic section for "/lib/tls/libc.so.6" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+warning: .dynamic section for "/lib/ld-linux.so.2" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+warning: .dynamic section for "/usr/lib/libz.so.1" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+warning: .dynamic section for "/lib/tls/libm.so.6" is not at the expected address
+warning: difference appears to be caused by prelink, adjusting expectations
+ScSipTransport.c: No such file or directory.
+ GNU gdb Red Hat Linux (6.3.0.0-1.132.EL4rh)
+ 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"...Using host libthread_db library "/lib/tls/libthread_db.so.1".
+ Core was generated by `sipd -c 500 -l 500'.
+Program terminated with signal 11, Segmentation fault.
+Reading symbols from /lib/tls/libpthread.so.0...done.
+Loaded symbols for /lib/tls/libpthread.so.0
+Reading symbols from /lib/tls/librt.so.1...done.
+Loaded symbols for /lib/tls/librt.so.1
+Reading symbols from /usr/lib/libxml2.so.2...done.
+Loaded symbols for /usr/lib/libxml2.so.2
+Reading symbols from /lib/tls/libc.so.6...done.
+Loaded symbols for /lib/tls/libc.so.6
+Reading symbols from /lib/ld-linux.so.2...done.
+Loaded symbols for /lib/ld-linux.so.2
+Reading symbols from /usr/lib/libz.so.1...done.
+Loaded symbols for /usr/lib/libz.so.1
+Reading symbols from /lib/tls/libm.so.6...done.
+Loaded symbols for /lib/tls/libm.so.6
+Reading symbols from /lib/libnss_files.so.2...done.
+Loaded symbols for /lib/libnss_files.so.2
+#0 0x0808f7f5 in ScSipXSResend (pstTimer=0x854f068, pvTimerData=0x86ffb18,
+bRetriesExhausted=1 '\001') at ScSipTransport.c:379
+in ScSipTransport.c
+</code>
+<code>
+(gdb) where
+#0 0x0808f7f5 in ScSipXSResend (pstTimer=0x854f068, pvTimerData=0x86ffb18,
+bRetriesExhausted=1 '\001') at ScSipTransport.c:379
+#1 0x0808e984 in TimerThread () at ScTimer.c:654
+#2 0x0053e371 in start_thread () from /lib/tls/libpthread.so.0
+#3 0x004879be in query_module () from /lib/tls/libc.so.6
+</code>
+Autres exemples :
+  gdb
+  (gdb) core /home/mon_fichier_core
+  (gdb) bt (afficher les backtraces)
+  (gdb) up (monter dans les bt)
+  (gdb) down (descendre dans les bt)
+  # gdb mon_fichier_core
+  (gdb) thread apply all bt
+Pour utiliser gdb sur un core dump le binaire doit être compilé avec l'option **-g** de **g++** ou **gcc** :
+  gcc -g -o myfile myfile.c
+gcore permet de faire un core dump d'un process en cours d'execution.
+  man core
+  man gcore