Changes between Version 28 and Version 29 of Core_dump

Timestamp:

Jul 23, 2010 9:16:56 AM (14 years ago)

Author:

Michael Thayer

Comment:

Describe pid-specific core dumps on Linux

Core_dump

@@ -5 +5 @@
 $ ulimit -c unlimited
 $ sudo su
+# echo -n 1 > /proc/sys/kernel/core_uses_pid
 # echo -n 1 > /proc/sys/fs/suid_dumpable
 # exit
@@ -13 +14 @@
 $ ulimit -c unlimited
 $ sudo su
+# echo -n 1 > /proc/sys/kernel/core_uses_pid
 # echo -n 1 > /proc/sys/fs/suid_dumpable
 # exit
@@ -19 +21 @@
 Ensure that '''no''' startup script (`~/.bashrc`, `~/.bash_profile`, `~/.profile`) contains an instruction like `ulimit -c 0` as the limit cannot be increased once it was set to zero.
 
-Starting with version 2.0.0, the !VirtualBox processes are started `suid root`. Therefore do
+Starting with version 2.0.0, the !VirtualBox processes are started `suid root`, that is, with permissions to do things that "normal" applications cannot. This is the reason for the
 {{{
 $ sudo su
@@ -25 +27 @@
 $ exit
 }}}
-before starting the VM/GUI (note that `sudo echo` will sometimes not work).
+before starting the VM/GUI (note that `sudo echo` will not do what we want here).
 
-When !VirtualBox crashes, a file core.<pid> is created in the current directory. Be aware that core dumps can be very huge. Please compress the file before submitting it to a bug report. Or better don't attach the file to a report. Note that this core dump can contain a memory dump of your guest which can include sensitive information. Send it to frank _dot_ mehnert at oracle _dot_ com if the compressed file is smaller than 5MB. Contact me directly otherwise.
+When !VirtualBox or one of its processes crashes, a file core.<pid> is created in the current directory. Be aware that core dumps can be very huge. Please compress the file before submitting it to a bug report. Or better don't attach the file to a report. Note that this core dump can contain a memory dump of your guest which can include sensitive information. Send it to frank _dot_ mehnert at oracle _dot_ com if the compressed file is smaller than 5MB. Contact me directly otherwise.
 
+If several core files are created, you can check which process created them using the command
+{{{
+$ file core.<pid>
+}}}
+to be sure of the right one to send.
 
 = How to create dumps on Mac OS X =