linux-kernel - Re: Need help: how to locate failure from irq

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Message-ID: <bceb32be-d508-c2a4-fa81-ab8b90323d3f@codeaurora.org>
Date:   Fri, 18 Jan 2019 15:54:33 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Pintu Agarwal <pintu.ping@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        linux-mm@...ck.org, linux-pm@...r.kernel.org,
        kernelnewbies@...nelnewbies.org
Subject: Re: Need help: how to locate failure from irq_chip subsystem

Hi Pintu-san,

On 1/18/2019 3:38 PM, Pintu Agarwal wrote:
> Hi All,
> 
> Currently, I am trying to debug a boot up crash on some qualcomm
> snapdragon arm64 board with kernel 4.9.
> I could find the cause of the failure, but I am unable to locate from
> which subsystem/drivers this is getting triggered.
> If you have any ideas or suggestions to locate the issue, please let me know.
> 
> This is the snapshot of crash logs:
> [    6.907065] Unable to handle kernel NULL pointer dereference at
> virtual address 00000000
> [    6.973938] PC is at 0x0
> [    6.976503] LR is at __ipipe_ack_fasteoi_irq+0x28/0x38
> [    7.151078] Process qmp_aop (pid: 24, stack limit = 0xfffffffbedc18000)
> [    7.242668] [<          (null)>]           (null)
> [    7.247416] [<ffffff9469f8d2e0>] __ipipe_dispatch_irq+0x78/0x340
> [    7.253469] [<ffffff9469e81564>] __ipipe_grab_irq+0x5c/0xd0
> [    7.341538] [<ffffff9469e81d68>] gic_handle_irq+0xc0/0x154
> 
> [    6.288581] [PINTU]: __ipipe_ack_fasteoi_irq - called
> [    6.293698] [PINTU]: __ipipe_ack_fasteoi_irq:
> desc->irq_data.chip->irq_hold is NULL
> 
> When I check, I found that the irq_hold implementation is missing in
> one of the irq_chip driver (expected by ipipe), which I am supposed to
> implement.
> 
> But I am unable to locate which irq_chip driver.
> If there are any good techniques to locate this in kernel, please help.
> 

Could you please tell which QCOM SoC this board is based on?

Thanks,
Sai

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