linux-kernel - Re: bug in kernel 2.6.21-rc1-git1: conventional floppy drive cannot be mounted without hanging up the whole system

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Date:	Mon, 26 Feb 2007 11:38:03 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Uwe Bugla <uwe.bugla@....de>
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	bunk@...sta.de, linux-kernel@...r.kernel.org
Subject: Re: bug in kernel 2.6.21-rc1-git1: conventional floppy drive cannot
 be mounted without hanging up the whole system

Uwe Bugla napsal(a):
> Hi folks,

Hi.

> Once again and for the last time: I do not state that floppy.c is broken. I only state that it is immpossible to mount a floppy drive with kernel 2.6.21-rc1-git1. Kernel 2.6.20 is OK. But 2.6.21-rc1-git1 is definitely buggy!
> I did some work already:
> a. I copied the following modules from the intact and sane kernel 2.6.20 into the 2.6.21-rc1-git1 tree:
> cdrom.h, floppy.c, init.h, io.h, proc_misc.c, setup.c, timer.h, uaccess.h
> b. I adjusted some hunks of the patch for module main.c (part of patch-2.6.21-rc1) to make the kernel compile without errors.
> But the problem still persists, and I do not have any idea anymore where the offensive hunks in patch-2.6.21-rc1 could reside.
> 
> Questions:
> a. Can someone please confirm the described problem?

Yup (last -mm).

> b. Can someone please take action to find out where the buggy code resides?

I'll take a look. I've seen here and tried to debug it down some time ago
without any result. Sysrq is dead, probably some kind of locking issue. LOCKDEP
screams silence, code reading returned nothing. I thought, it's problem inside
my setup, I gave it up (even reporting). But it seems to be real problem now.

> c. Why is this untested material being pushed into main vanilla - what is going on at kernel.org please?

Hard to say, nobody is perfect, this should never happen, but unfortunately it does.

regards,
-- 
http://www.fi.muni.cz/~xslaby/            Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8  22A0 32CC 55C3 39D4 7A7E

Hnus <hnus@...muni.cz> is an alias for /dev/null

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