Re: stability problems

[Thomas Klausner <wiz%NetBSD.org@localhost>]

On Sun, Mar 13, 2011 at 06:13:32PM +0100, Thomas Klausner wrote:
> Since updating from 5.99.47/amd64 (2011-02-28) to 5.99.48 (2011-03-11)
> my usually very stable desktop machine has rebooted twice without any
> apparent reason or syslog entry.

I've now got a reproducible case where it does that: When I'm running
the tests for m4-1.4.16 in my bulk build tmpfs sandbox.

Since after two times I was expecting it, I got a (handcopied)
backtrace now:

vmem_alloc() at netbsd:vmem_alloc+0x38
tmpfs_alloc_node() at netbsd:tmpfs_alloc_node+0x232
tmpfs_alloc_file() at netbsd:tmpfs_alloc_file+0xb0
VOP_SYMLINK() at netbsd:VOP_SYMLINK+0x71
do_sys_symlink() at netbsd:do_sys_symlink+0x16a
syscall() at netbsd:syscall+0xaa

My setup is like this:

tmpfs on /home/wiz/sandbox type tmpfs (local)
/bin on /home/wiz/sandbox/bin type null (read-only, local)
/sbin on /home/wiz/sandbox/sbin type null (read-only, local)
/lib on /home/wiz/sandbox/lib type null (read-only, local)
/libexec on /home/wiz/sandbox/libexec type null (read-only, local)
/usr/X11R7 on /home/wiz/sandbox/usr/X11R7 type null (read-only, local)
/usr/bin on /home/wiz/sandbox/usr/bin type null (read-only, local)
/usr/games on /home/wiz/sandbox/usr/games type null (read-only, local)
/usr/include on /home/wiz/sandbox/usr/include type null (read-only, local)
/usr/lib on /home/wiz/sandbox/usr/lib type null (read-only, local)
/usr/libdata on /home/wiz/sandbox/usr/libdata type null (read-only, local)
/usr/libexec on /home/wiz/sandbox/usr/libexec type null (read-only, local)
/usr/share on /home/wiz/sandbox/usr/share type null (read-only, local)
/usr/sbin on /home/wiz/sandbox/usr/sbin type null (read-only, local)
/var/mail on /home/wiz/sandbox/var/mail type null (read-only, local)
/usr/src on /home/wiz/sandbox/usr/src type null (read-only, local)
/usr/pkgsrc on /home/wiz/sandbox/usr/pkgsrc type null (local)
/usr/xsrc on /home/wiz/sandbox/usr/xsrc type null (read-only, local)
/archive/packages/5.99.48 on /home/wiz/sandbox/packages type null (local)
/archive/distfiles on /home/wiz/sandbox/distfiles type null (local)

Inside this setup, I do:
cd /usr/pkgsrc/devel/m4
make
make test

This runs a few tests directly, the compiles some stuff, and after
that runs more tests, one of which causes this.

My kernel has been updated yesterday.

Ideas?
What more information can I provide (without a few reboot cycles, if
possible)?
 Thomas