Need help: how to locate failure from irq_chip subsystem

From: Pintu Agarwal
Date: Fri Jan 18 2019 - 05:09:02 EST

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

But I am unable to locate which irq_chip driver.
If there are any good techniques to locate this in kernel, please help.