linux-kernel - Re: NULL ptr dereference in __remove

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Message-Id: <1232906526.5424.1.camel@laptop>
Date:	Sun, 25 Jan 2009 19:02:06 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mandar Thite <mandarthite@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: NULL ptr dereference in __remove_hrtimer()

On Sun, 2009-01-25 at 15:48 +0530, Mandar Thite wrote:
> Hello everyone,
> 
> I am trying to boot Linux kernel on OMAP5912 CPU(arch/arm/mach-omap1)
> containing ARM926 core.
> I have configured my Linux kernel to run in tickless mode. In the
> final steps of booting, kernel is encountering " NULL pointer
> dereference " in the function " rb_erase() " called from " __remove_hrtimer() ".
> Following is the backtrace log emitted by the kernel.
> 
> Backtrace:
> [<c012ed1c>] (rb_erase+0x0/0x358) from [<c0053f48>] (__remove_hrtimer+0x88/0x94)
>  r9:00000080 r8:c0285530 r7:00000000 r6:00000001 r5:c0285530
> r4:c02a6298
> [<c0053ec0>] (__remove_hrtimer+0x0/0x94) from [<c00548a8>]
> (hrtimer_start+0x74/0x108)
>  r7:00000006 r6:02625a00 r5:00000000 r4:2d4cae00
> [<c0054834>] (hrtimer_start+0x0/0x108) from [<c005af18>]
> (tick_nohz_stop_sched_tick+0x2bc/0x3a4)
> [<c005ac5c>] (tick_nohz_stop_sched_tick+0x0/0x3a4) from [<c0023318>]
> (cpu_idle+0x38/0x60)
> [<c00232e0>] (cpu_idle+0x0/0x60) from [<c01f7d58>] (rest_init+0x58/0x6c)
>  r5:c001cdc4 r4:c02bc754
> [<c01f7d00>] (rest_init+0x0/0x6c) from [<c0008ad0>] (start_kernel+0x244/0x290)
> [<c000888c>] (start_kernel+0x0/0x290) from [<10008034>] (0x10008034)
>  r6:c001cdc0 r5:c029af88 r4:00053175
> Code: e3580001 01a04005 189dabf0 ea000082 (e5941008)
> ---[ end trace b0a66fe3e48abdda ]---
> Kernel panic - not syncing: Attempted to kill the idle task!
> 
> What I understand is, address of nonexistent node is passed to rb_erase()?
> Can anybody please direct me, how to investigate further into this problem?

For one, provide the kernel version you're trying to boot. Secondly,
it's much easier to read backtraces when they're not mangled.

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