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Date: Tue, 14 Nov 2006 02:05:17 -0800
From: Andrew Morton <akpm@osdl.org>
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
       "linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH] some irq_chip variables initiate end to point to NULL
Message-Id: <20061114020517.2222dd08.akpm@osdl.org>
In-Reply-To: <1163495289.4311.68.camel@ymzhang-perf.sh.intel.com>
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On Tue, 14 Nov 2006 17:08:10 +0800
"Zhang, Yanmin" <yanmin_zhang@linux.intel.com> wrote:

> I got an oops when booting 2.6.19-rc5-mm1 on my ia64 machine.
> 
> Below is the log.
> 
> Oops 11012296146944 [1]
> Modules linked in: binfmt_misc dm_mirror dm_multipath dm_mod thermal processor f
> an container button sg eepro100 e100 mii
> 
> Pid: 0, CPU 0, comm:              swapper
> psr : 0000121008022038 ifs : 800000000000040b ip  : [<a0000001000e1411>]    Not
> tainted
> ip is at __do_IRQ+0x371/0x3e0
> unat: 0000000000000000 pfs : 000000000000040b rsc : 0000000000000003
> rnat: 656960155aa56aa5 bsps: a00000010058b890 pr  : 656960155aa55a65
> ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c0270033f
> csd : 0000000000000000 ssd : 0000000000000000
> b0  : a0000001000e1390 b6  : a0000001005beac0 b7  : e00000007f01aa00
> f6  : 000000000000000000000 f7  : 0ffe69090000000000000
> f8  : 1000a9090000000000000 f9  : 0ffff8000000000000000
> f10 : 1000a908ffffff6f70000 f11 : 1003e0000000000000909
> r1  : a000000100fbbff0 r2  : 0000000000010002 r3  : 0000000000010001
> r8  : fffffffffffbffff r9  : a000000100bd8060 r10 : a000000100dd83b8
> r11 : fffffffffffeffff r12 : a000000100bcbbb0 r13 : a000000100bc4000
> r14 : 0000000000010000 r15 : 0000000000010000 r16 : a000000100c01aa8
> r17 : a000000100d2c350 r18 : 0000000000000000 r19 : a000000100d2c300
> r20 : a000000100c01a88 r21 : 0000000080010100 r22 : a000000100c01ac0
> r23 : a0000001000108e0 r24 : e000000477980004 r25 : 0000000000000000
> r26 : 0000000000000000 r27 : e00000000913400c r28 : e0000004799ee51c
> r29 : e0000004778b87f0 r30 : a000000100d2c300 r31 : a00000010005c7e0
> 
> Call Trace:
>  [<a000000100014600>] show_stack+0x40/0xa0
>                                 sp=a000000100bcb760 bsp=a000000100bc4f40
>  [<a000000100014f00>] show_regs+0x840/0x880
>                                 sp=a000000100bcb930 bsp=a000000100bc4ee8
>  [<a000000100037fb0>] die+0x250/0x320
>                                 sp=a000000100bcb930 bsp=a000000100bc4ea0
>  [<a00000010005e5f0>] ia64_do_page_fault+0x8d0/0xa20
>                                 sp=a000000100bcb950 bsp=a000000100bc4e50
>  [<a00000010000caa0>] ia64_leave_kernel+0x0/0x290
>                                 sp=a000000100bcb9e0 bsp=a000000100bc4e50
>  [<a0000001000e1410>] __do_IRQ+0x370/0x3e0
>                                 sp=a000000100bcbbb0 bsp=a000000100bc4df0
>  [<a000000100011f50>] ia64_handle_irq+0x170/0x220
>                                 sp=a000000100bcbbb0 bsp=a000000100bc4dc0
>  [<a00000010000caa0>] ia64_leave_kernel+0x0/0x290
>                                 sp=a000000100bcbbb0 bsp=a000000100bc4dc0
>  [<a000000100012390>] ia64_pal_call_static+0x90/0xc0
>                                 sp=a000000100bcbd80 bsp=a000000100bc4d78
>  [<a000000100015630>] default_idle+0x90/0x160
>                                 sp=a000000100bcbd80 bsp=a000000100bc4d58
>  [<a000000100014290>] cpu_idle+0x1f0/0x440
>                                 sp=a000000100bcbe20 bsp=a000000100bc4d18
>  [<a000000100009980>] rest_init+0xc0/0xe0
>                                 sp=a000000100bcbe20 bsp=a000000100bc4d00
>  [<a0000001009f8ea0>] start_kernel+0x6a0/0x6c0
>                                 sp=a000000100bcbe20 bsp=a000000100bc4ca0
>  [<a0000001000089f0>] __end_ivt_text+0x6d0/0x6f0
>                                 sp=a000000100bcbe30 bsp=a000000100bc4c00
>  <0>Kernel panic - not syncing: Aiee, killing interrupt handler!
> 
> 
> The root cause is that some irq_chip variables, especially ia64_msi_chip,
> initiate their memeber end to point to NULL. __do_IRQ doesn't check
> if irq_chip->end is null and just calls it after processing the interrupt.
> 
> As irq_chip->end is called at many places, so I fix it by reinitiating
> irq_chip->end to dummy_irq_chip.end, e.g., a noop function.
> 
> Below patch against 2.6.19-rc5-mm1 fixes it.
> 
> Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>
> 
> ---
> 
> --- linux-2.6.19-rc5-mm1/kernel/irq/chip.c	2006-11-14 14:16:16.000000000 +0800
> +++ linux-2.6.19-rc5-mm1_fix/kernel/irq/chip.c	2006-11-14 14:14:25.000000000 +0800
> @@ -233,6 +233,8 @@ void irq_chip_set_defaults(struct irq_ch
>  		chip->shutdown = chip->disable;
>  	if (!chip->name)
>  		chip->name = chip->typename;
> +	if (!chip->end)
> +		chip->end = dummy_irq_chip.end;
>  }
>  

The same bug should be hitting in mainline, shouldn't it?

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