linux-kernel - Re: Can someone confirm ext4 BUG

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Message-Id: <20110619080704.33753b99.rdunlap@xenotime.net>
Date:	Sun, 19 Jun 2011 08:07:04 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	halfdog <me@...fdog.net>, linux-ext4@...r.kernel.org
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Can someone confirm ext4 BUG_ON on latest kernel build?

[adding ext4 mailing list]


On Sun, 19 Jun 2011 10:13:52 +0000 halfdog wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> 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/
> PGP: 156A AE98 B91F 0114 FE88  2BD8 C459 9386 feed a bee
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---
~Randy
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