From: Mark Lord <kernel@teksavvy.com>
To: Ted Ts'o <tytso@mit.edu>,
Linux Kernel <linux-kernel@vger.kernel.org>,
linux-ext4@vger.kernel.org
Subject: Re: ext4 crash on 2.6.37: NULL ptr in ext4_discard_preallocations
Date: Sat, 19 Feb 2011 23:54:31 -0500 [thread overview]
Message-ID: <4D609E87.5000903@teksavvy.com> (raw)
In-Reply-To: <20110220000550.GA8765@thunk.org>
On 11-02-19 07:05 PM, Ted Ts'o wrote:
> On Sat, Feb 19, 2011 at 05:37:20PM -0500, Mark Lord wrote:
>> 32-bit x86 system, 2.6.37 SMP kernel, Core2duo, 3.3GB RAM, no swap.
>>
>> The system just suddenly switched to fbconsole and dumped a traceback.
>> Here's the screen-shot photo: http://rtr.ca/ext4_crash.jpg
>>
>> Is this a known bug that got fixed in 2.6.37.1 ?
>
> No, this looks like a new one.
>
> And I can't make the Code: line make sense. Can you send me the
> fs/ext4/mballoc.s file after running the command "make
> fs/ext4/mballoc.s" in your build tree where you built this kernel?
Sent. And here's an extract:
.globl ext4_discard_preallocations
.type ext4_discard_preallocations, @function
ext4_discard_preallocations:
pushl %ebp #
pushl %edi #
leal -136(%eax), %edi #, ei
pushl %esi #
pushl %ebx #
subl $80, %esp #,
movl 172(%eax), %esi # <variable>.i_sb, sb
movl $0, 76(%esp) #, group
movzwl 122(%eax), %edx # <variable>.i_mode, tmp85
andl $61440, %edx #, tmp85
cmpl $32768, %edx #, tmp85
jne .L875 #,
leal 68(%esp), %edx #, tmp86
leal 380(%eax), %ebx #, D.45176
movl %edx, 68(%esp) # tmp86, list.next
addl $372, %eax #,
movl %edx, 72(%esp) # tmp86, list.prev
movl %eax, 28(%esp) #, %sfp
.L876:
movl %ebx, %eax # D.45176,
call _raw_spin_lock #
jmp .L861 #
.L867:
cmpl %ebx, 60(%ebp) # D.45176, <variable>.pa_obj_lock
je .L862 #,
#APP
# 3810 "fs/ext4/mballoc.c" 1
1: ud2
I wonder if the 003c offset is that "cmpl %ebx, 60(%ebp)" line?
next prev parent reply other threads:[~2011-02-20 4:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-19 22:37 ext4 crash on 2.6.37: NULL ptr in ext4_discard_preallocations Mark Lord
2011-02-20 0:05 ` Ted Ts'o
2011-02-20 4:54 ` Mark Lord [this message]
2011-02-20 5:05 ` Mark Lord
2011-02-20 6:15 ` Ted Ts'o
2011-02-20 13:55 ` Mark Lord
2011-02-20 14:39 ` Mark Lord
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