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Unable to handle kernel NULL pointer dereference at virtual address 000000a0
pgd = 86cf8a40
[000000a0] *pgd=87023003, *pmd=fe702003
Internal error: Oops: 207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 23585 Comm: iou-sqp-23579 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at atomic_add arch/arm/include/asm/atomic.h:223 [inline]
PC is at atomic_inc include/linux/atomic-fallback.h:372 [inline]
PC is at io_uring_cancel_sqpoll+0xac/0x1a0 fs/io_uring.c:8926
LR is at io_sq_thread+0x3d0/0x6f8 fs/io_uring.c:6772
pc : [<80561f00>]    lr : [<80566f50>]    psr: 60000013
sp : 870ffee0  ip : 85618000  fp : 870fff2c
r10: 00000000  r9 : 870fe000  r8 : 00000000
r7 : 86cf0800  r6 : 86289500  r5 : 86289554  r4 : 86cf0800
r3 : 000000a0  r2 : 870fe000  r1 : 000000a0  r0 : 870ffef4
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 86cf8a40  DAC: 00000000
Process iou-sqp-23579 (pid: 23585, stack limit = 0x870fe210)
Stack: (0x870ffee0 to 0x87100000)
fee0: 00000000 000000a0 00000000 85618000 802a6878 870ffef4 870ffef4 56b92eae
ff00: 00000001 86cf0800 86289554 86289500 00000000 00000000 870fe000 00000000
ff20: 870fffac 870fff30 80566f50 80561e60 86289504 81f744cc 82a06d00 00000000
ff40: 80384db8 86289500 835a8b00 86289554 00000000 00000000 00000000 85618000
ff60: 802a6878 870fff64 870fff64 2d756f69 2d707173 37353332 80250039 56b92eae
ff80: 00000000 86289500 80566b80 00000000 00000000 00000000 00000000 00000000
ffa0: 00000000 870fffb0 80200114 80566b8c 00000000 00000000 00000000 00000000
ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 00000000
Backtrace: 
[<80561e54>] (io_uring_cancel_sqpoll) from [<80566f50>] (io_sq_thread+0x3d0/0x6f8 fs/io_uring.c:6772)
 r10:00000000 r9:870fe000 r8:00000000 r7:00000000 r6:86289500 r5:86289554
 r4:86cf0800
[<80566b80>] (io_sq_thread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158)
Exception stack(0x870fffb0 to 0x870ffff8)
ffa0:                                     00000000 00000000 00000000 00000000
ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
ffe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80566b80
 r4:86289500
Code: e28830a0 e50b3048 f593f000 e1a01003 (e1913f9f) 
---[ end trace 0ea5cf0d88cd89fa ]---