Messages in this thread | | | Date | Fri, 6 Oct 2006 16:54:25 -0700 | From | Andrew Morton <> | Subject | Re: Simple script that locks up my box with recent kernels |
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On Sat, 7 Oct 2006 01:36:24 +0200 "Jesper Juhl" <jesper.juhl@gmail.com> wrote:
> Hi, > > I've been using the this very simple script for a while to do test > builds of the kernel : > > > #!/bin/bash > > for i in $(seq 1 100); do > nice make distclean > while true; do > nice make randconfig > grep -q "CONFIG_EXPERIMENTAL=y" .config > if [ $? -eq 1 ]; then > break > fi > done > cp .config config.${i} > nice make -j3 > build.log.${i} 2>&1 > done > > > Which has worked great in the past, but with recent kernels it has > been a sure way to cause a complete lockup within 1 hour :-( >
This is probably one of those nobody-but-you-can-reproduce-it things.
> > The last kernel where I know for sure that it ran without problems is > 2.6.17.13 . > The first kernel where I know for sure it caused lockups is > 2.6.18-git15 . I've also tested 2.6.18-git16, 2.6.18-git21 and > 2.6.19-rc1-git2 and those 3 also lock up solid. > > The lockup usually happens within 30 minutes, but sometimes the box > survives longer, but I've not seen it survive for more than 60 minutes > at most. > It doesn't seem to matter if I leave it alone just building kernels or > if I use it for other purposes while building in the background - if > anything, it seems to survive longer when I do other work while it > builds. > > When the lockup happens the box just freezes and doesn't respond to > anything at all. Sometimes I can reboot with alt+sysrq+b but sometimes > not even that works.
If you can do sysrq-b then you can do sysrq-t, too?
Please ensure that you have all the CONFIG_DEBUG_* things set, apart from PAGEALLOC.
> Here's exactely what I do, so you can try to reproduce : > > 1) boot my distro (Slackware 11.0) into runlevel 4 (multi-user with > X), using kernel 2.6.19-rc1-git2 (or one of the other "known-bad" > kernels). > > 2) Log in via kdm, and once I'm at my KDE desktop I start 'konsole'. > > 3) cd into a dir holding a fresh copy of the 2.6.19-rc1-git2 source > and run the above script from a file named build-random.sh that I have > placed in the root of the source dir and made executable. > > 4) wait for 0-60 minutes. > > > After a reboot I find nothing in the logs, so I can't give you many > hints on what goes wrong, unfortunately. >
Once you've got the test set up and running, you can do the alt-ctl-F1 thing to take you out of X and into the vga console. I suggest you leave it running that way, see if anything pops up when it hangs.
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