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Unable to handle kernel NULL pointer dereference at virtual address 000000a0
pgd = 87046800
[000000a0] *pgd=86e4f003, *pmd=fe589003
Internal error: Oops: 207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 8592 Comm: iou-sqp-8582 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 : 86a21ee0  ip : 86c58000  fp : 86a21f2c
r10: 00000000  r9 : 86a20000  r8 : 00000000
r7 : 86369800  r6 : 87040600  r5 : 87040654  r4 : 86369800
r3 : 000000a0  r2 : 86a20000  r1 : 000000a0  r0 : 86a21ef4
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 87046800  DAC: 00000000
Process iou-sqp-8582 (pid: 8592, stack limit = 0x86a20210)
Stack: (0x86a21ee0 to 0x86a22000)
1ee0: 00000000 000000a0 00000000 86c58000 802a6878 86a21ef4 86a21ef4 56b92eae
1f00: 00000001 86369800 87040654 87040600 00000000 00000000 86a20000 00000000
1f20: 86a21fac 86a21f30 80566f50 80561e60 87040604 81f744cc 82a06d00 00000000
1f40: 80384db8 87040600 835ef900 87040654 00000000 00000000 00000000 86c58000
1f60: 802a6878 86a21f64 86a21f64 2d756f69 2d707173 32383538 80258400 56b92eae
1f80: 00000000 87040600 80566b80 00000000 00000000 00000000 00000000 00000000
1fa0: 00000000 86a21fb0 80200114 80566b8c 00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 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 r9:86a20000 r8:00000000 r7:00000000 r6:87040600 r5:87040654
 r4:86369800
[<80566b80>] (io_sq_thread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158)
Exception stack(0x86a21fb0 to 0x86a21ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80566b80
 r4:87040600
Code: e28830a0 e50b3048 f593f000 e1a01003 (e1913f9f) 
---[ end trace 6a984c77ec7dd81d ]---