linux-kernel - Re: Kmemcheck issue

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Message-ID: <x2u9bde694e1004200316i6417ad36oe399b88cb385cf54@mail.gmail.com>
Date:	Tue, 20 Apr 2010 15:46:56 +0530
From:	naveen yadav <yad.naveen@...il.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	linux-arm-kernel-request@...ts.arm.linux.org.uk,
	linux newbie <linux.newbie79@...il.com>,
	linux-kernel@...r.kernel.org,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: Kmemcheck issue

Hi Vegard,

Thanks for your answer, but this is coming from kmemchek only

thanks
naveen
On Tue, Apr 20, 2010 at 1:31 PM, Vegard Nossum <vegard.nossum@...il.com> wrote:
> On 19 April 2010 15:23, naveen yadav <yad.naveen@...il.com> wrote:
>> Hi,
>>
>> á á á I áam átrying to á run áKmemcheck on á a áCortex ( ARM-v7)
>> board árunning áLinux 2.6.30.9
>>
>> At boot-up time, áas ásoon áas áTimer-device is áenabled, á I áfind
>> that á timer ágets ádisabled ábecause ásystem
>> gets spurious áinterrupts áon áthat áirq áline.
>>
>>
>> PID hash table entries: 1024 (order: 10, 4096 bytes)
>> Linux System timer initialize
>> irq 23: nobody cared (try booting with the "irqpoll" option)
>> [<c002e148>] (unwind_backtrace+0x0/0xe8) from [<c002c4b8>]
>> (dump_stack+0x18/0x1c)
>> [<c002c4b8>] (dump_stack+0x18/0x1c) from [<c006ad74>]
>> (__report_bad_irq+0x80/0xb0)
>> [<c006ad74>] (__report_bad_irq+0x80/0xb0) from [<c006af28>]
>> (note_interrupt+0x184/0x1f0)
>> [<c006af28>] (note_interrupt+0x184/0x1f0) from [<c006ba38>]
>> (handle_edge_irq+0xe8/0x160)
>> [<c006ba38>] (handle_edge_irq+0xe8/0x160) from [<c0027060>]
>> (asm_do_IRQ+0x60/0x74)
>> [<c0027060>] (asm_do_IRQ+0x60/0x74) from [<c0027a30>] (__irq_svc+0x30/0x80)
>> Exception stack(0xc0373ec0 to 0xc0373f08)
>> 3ec0: 00000017 c0372000 00000002 00000000 00000002 c038e8f4 00000000 0aa00000
>> 3ee0: c0372000 c03bfc40 0000001f c0373f44 00000100 c0373f08 c0047ffc c0047c98
>> 3f00: 20000153 ffffffff
>> [<c0027a30>] (__irq_svc+0x30/0x80) from [<c0047ffc>] (irq_exit+0x44/0x4c)
>> [<c0047ffc>] (irq_exit+0x44/0x4c) from [<c0047ffc>] (irq_exit+0x44/0x4c)
>> [<c0047ffc>] (irq_exit+0x44/0x4c) from [<c0027064>] (asm_do_IRQ+0x64/0x74)
>> [<c0027064>] (asm_do_IRQ+0x64/0x74) from [<c0027a30>] (__irq_svc+0x30/0x80)
>> Exception stack(0xc0373f78 to 0xc0373fc0)
>> 3f60: á á á á á á á á á á á á á á á á á á á á á á á á á á á 00000000 c037c15c
>> 3f80: 00000001 600001d3 955fffff c00242ec c0399f80 0aa00000 c0023000 412fc082
>> 3fa0: 0000001f c0373ff4 c0373fc0 c0373fc0 c0008974 c0019798 20000153 ffffffff
>> [<c0027a30>] (__irq_svc+0x30/0x80) from [<c0008974>] (start_kernel+0x168/0x3e4)
>> [<c0008974>] (start_kernel+0x168/0x3e4) from [<60008034>] (0x60008034)
>> handlers:
>> [<c003a604>] (sdp_timer_interrupt+0x0/0x38)
>> Disabling IRQ #23
>> Console: colour dummy device 80x30
>> console [ttyS1] enabled
>> Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
>> Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
>>
>>
>> Later, áwhen ácalibrating delay áloop, áthe system is hung áas timer
>> is not working.
>>
>> The problem happens áeven if áI áset kmemcheck_enabled = 0 at áboot.
>> ( I also commented out á á pagetable_init(&meminfo) á).
>>
>> áIf áyou have seen this before, áplease let me know.
>>
>> ( I know that áyour patch was written for á ARM v6. á á My cpu is
>> Cortex . á áI am aware that áI may have to make some change in the
>> áinstruction simulation handling. )
>>
>> Thanks
>
> Hi,
>
> First up, I see a lot of funny á characters in your text.
>
> I think that this is not about kmemcheck, but kmemleak. kmemcheck is
> for catching references to uninitialized memory while kmemleak is for
> detecting memory leaks. kmemcheck only works on x86 so far (with an
> ARM patch by Ye Janboe, but it is not in mainline). kmemleak, however,
> was written on ARM.
>
> I put Catalin Marinas (kmemleak author) on Cc.
>
> Please correct me if I am wrong. Good luck.
>
>
> Vegard
>
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