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Subject2.6.21-rc3: /proc broken
Date
On Friday 09 March 2007 01:52, Con Kolivas wrote:
> On Thursday 08 March 2007 15:19, Andrew Morton wrote:
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc3/
> >2. 6.21-rc3-mm2/
> >
> > - This is the same as 2.6.21-rc3-mm1, except Con's CPU scheduler changes
> > were dropped.

> So on qemu I can reproduce the oops you're getting with your config (make
> oldconfig all default on top of your config), but I'm getting other
> wonderful related problems too on rc3-mm2. On qemu -mm1 boots mostly
> without error and then crashes nicely when I type 'ps' with a long pause
> for about twenty seconds and then a combination of soft lockups, bitmap
> errors, and eventually hits the BUG_ON I put in bitmap_error(). However,
> -mm2 also vomits on typing 'ps'.
>
> It pauses and then spits out (fun lines selected from ps output):
>
> 7 ? serial8250: too much work for irq4
> 00:00:00 watchdog/1
> 88 ? 00:00:0serial8250: too much work for irq4
> 0 cqueue/1
> 137 ? 00:00serial8250: too much work for irq4
>
> :00 aio/0
>
> Checking a few /proc files I see that "serial83250" info littered
> throughout /proc/stat as well. -mm2 does not oops but the proc output is
> variously corrupted.
>
> Interestingly if I don't type 'ps' in the -mm1 qemu it runs fine with no
> sign of a bug... In summary, here I can only reproduce your big fat oops by
> it being triggered by some corruption elsewhere on this config related to
> /proc breakage that I haven't managed to track down. I checked the
> broken-out patches to see which touched /proc and it was oh, most of them.
> I tried on rc3 and had the same thing happen. I haven't tried rc3 without
> rsdl (your config takes too darn long to build!).

/proc appears broken on vanilla -rc3 as well.

I did make oldconfig from http://userweb.kernel.org/~akpm/ck/config.txt and
chose all the defaults. Then building your fat config with -rc3, 'ps' hangs
on qemu for almost 30 seconds and then at last produces a broken output

PID TTY TIME CMD
1 ? 00:00:00 init
2 ? 00:00:00 migration/0
3 ? 00:00:00 ksoftirqd/0
4 ? 00:00:00 watchdog/0
5 ? 00:00:00 migration/1
6 ? 00:00:00 ksoftirqd/1
7 ? serial8250: too much work for irq4
00:00:00 watchdog/1
8 ? 00:00:00 events/0
9 ? 00:00:00 events/1
10 ? 00:00:00 khelper
11 ? 00:00:00 kthread
52 ? 00:00:00 kblockd/0
53 ? 00:00:00 kblockd/1
54 ? 00:00:00 kacpid
87 ? 00:00:00 cqueue/0
88 ? 00:00:00 cqueue/1
89 ? 00:00:00 ata/0
90 ? 00:00:00 ata/1
91 ? 00:00:00 ata_aux
92 ? 00:00:00 ksuspend_usbd
95 ? 00:00:00 khubd
97 ? 00:00:00 kseriod
133 ? 00:00:00 pdflush
134 ? 00:00:00 pdflush
135 ? 00:00:00 kserial8250: too much work for irq4
swapd0
136 ? 00:00:00 aio/0
137 ? 00:00:00 aio/1
287 ? 00:00:00 kpsmoused
311 ? 00:00:00 sh
312 ? 00:00:00 ps

It's random where this happens too. Sometimes it goes away, other times it's
different tasks, and it happens to /proc/stat too
--
-ck
-
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