linux-kernel - Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine)

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Message-ID: <20110519204342.GA10792@home.goodmis.org>
Date:	Thu, 19 May 2011 16:43:43 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	richard -rw- weinberger <richard.weinberger@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: Re: kernel 2.6.39 (user mode linux) crashes (2.6.38 works fine)

On Thu, May 19, 2011 at 10:18:16PM +0200, Toralf Förster wrote:
> 
> richard -rw- weinberger wrote at 19:00:35
> > Can you bisect the issue?

Is this bug fully reproducable? If not, then you may have had a git
bisect good, when it should have been git bisect bad.

The futex/plist should not be affecting rwsem.

-- Steve

> 
> tfoerste@n22 ~/devel/linux-2.6 $ git bisect bad
> 2e12978a9f7a7abd54e8eb9ce70a7718767b8b2c is the first bad commit
> commit 2e12978a9f7a7abd54e8eb9ce70a7718767b8b2c
> Author: Lai Jiangshan <laijs@...fujitsu.com>
> Date:   Wed Dec 22 14:18:50 2010 +0800
> 
>     futex,plist: Pass the real head of the priority list to plist_del()
>     
>     Some plist_del()s in kernel/futex.c are passed a faked head of the
>     priority list.
>     
>     It does not fail because the current code does not require the real head
>     in plist_del(). The current code of plist_del() just uses the head for 
> checking,
>     so it will not cause a bad result even when we use a faked head.
>     
>     But it is undocumented usage:
>     
>     /**
>      * plist_del - Remove a @node from plist.
>      *
>      * @node:   &struct plist_node pointer - entry to be removed
>      * @head:   &struct plist_head pointer - list head
>      */
>     
>     The document says that the @head is the "list head" head of the priority 
> list.
>     
>     In futex code, several places use "plist_del(&q->list, &q->list.plist);",
>     they pass a fake head. We need to fix them all.
>     
>     Thanks to Darren Hart for many suggestions.
>     
>     Acked-by: Darren Hart <dvhart@...ux.intel.com>
>     Signed-off-by:  Lai Jiangshan <laijs@...fujitsu.com>
>     LKML-Reference: <4D11984A.5030203@...fujitsu.com>
>     Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> :040000 040000 78d47de377f8da1c131007a17ca915fbd13f7ff6 
> ffac93205aaf22fda0667d6395c8da7c7bf692e4 M      kernel
> 
> -- 
> MfG/Sincerely
> Toralf Förster
> pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
> --
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