linux-kernel - Can someone confirm ext4 BUG

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Message-ID: <4DFDCBE0.5020806@halfdog.net>
Date:	Sun, 19 Jun 2011 10:13:52 +0000
From:	halfdog <me@...fdog.net>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Can someone confirm ext4 BUG_ON on latest kernel build?

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Sorry, I do not have latest kernel. Can someone confirm this on latest?
At least bugtracker does not know about it, and to my understanding of
source, should be still here.

dd if=/dev/zero bs=1M count=64 of=test
mkfs.ext4 -F test
echo -n " " | dd of=test bs=1 count=1 seek=297195 conv=notrunc
mount -o loop test /mnt/test
dmesg -c

On ubuntu natty with latest kernel, it seems, that
fs/ext4/super.c:__save_error_info calls mod_timer before timer->function
is set at end of fs/ext4/super.c:ext4_fill_super via
  sbi->s_err_report.function = print_daily_error_info;

This causes BUG_ON(!timer->function) in kernel/timer.c:__mod_timer
Device is stuck, not usable any more.

Thanks

- -- 
http://www.halfdog.net/
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