makedumpfile --dump-dmesg fails on 3.5 kernels and later

[Louis Bouchard]

When used on Ubuntu running kernel 3.5 and later (Quantal, raring and Precise 12.04.02) the makedumpfile --dump-dmesg /proc/vmcore /tmp/dmesg fails with the following error :

# makedumpfile --dump-dmesg /proc/vmcore /tmp/dmesg
dump_dmesg: Can't find some symbols for log_buf.

makedumpfile Failed.

This is caused by the change from byte-buffer structure to
variable-length record buffer of the kernel log buffer introduced by
this commit :
 http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7ff9554bb578ba02166071d2d487b7fc7d860d62

The same issue occurs on Debian and is identified in Debian bug #698755 :

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=698755

[Louis Bouchard (louis)]

Looks like the debian bug needs to be in a comment for it to be linked so here it is :

The same issue occurs on Debian and is identified in Debian bug #698755 :

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=698755

I am actively working on the debian bug as well, and just proposed a fix for this issue to the upstream maintianer :

http://lists.infradead.org/pipermail/kexec/2013-January/007897.html

[Louis Bouchard (louis)]

A patch for the upstream version of makedumpfile has been accepted by
the maintainer :

http://lists.infradead.org/pipermail/kexec/2013-February/007925.html

This patch will most probablly be included in the upcoming debian
version of makedumpfile 1.5.1 due to be uploaded soon.

Then the newest makedumpfile 1.5.1 package will need to be brought in Raring

..Louis

[Louis Bouchard (louis)]

The upstream patch is now in the debian makedumpfile-1.5.1 package, which is also now in the Raring archive.

Closing this bug as the fix is now available publicly.

[The Loeki (the-loeki)]

Will there be a fix for Precise?