8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 000000a0
pgd = 86cc5f00
[000000a0] *pgd=86b27003, *pmd=fe671003
Internal error: Oops: 207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 8038 Comm: iou-sqp-8033 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 : 868f9ee0  ip : 834f6180  fp : 868f9f2c
r10: 00000000  r9 : 868f8000  r8 : 00000000
r7 : 86c76800  r6 : 8691d100  r5 : 8691d154  r4 : 86c76800
r3 : 000000a0  r2 : 868f8000  r1 : 000000a0  r0 : 868f9ef4
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 86cc5f00  DAC: fffffffd
Process iou-sqp-8033 (pid: 8038, stack limit = 0x868f8210)
Stack: (0x868f9ee0 to 0x868fa000)
9ee0: 00000000 000000a0 00000000 834f6180 802a6878 868f9ef4 868f9ef4 56b92eae
9f00: 00000001 86c76800 8691d154 8691d100 00000000 00000000 868f8000 00000000
9f20: 868f9fac 868f9f30 80566f50 80561e60 8691d104 81f744cc 82a06d00 00000000
9f40: 80384db8 8691d100 85aa8b00 8691d154 00000000 00000000 00000000 834f6180
9f60: 802a6878 868f9f64 868f9f64 2d756f69 2d707173 33333038 80258400 56b92eae
9f80: 00000000 8691d100 80566b80 00000000 00000000 00000000 00000000 00000000
9fa0: 00000000 868f9fb0 80200114 80566b8c 00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 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 r9:868f8000 r8:00000000 r7:00000000 r6:8691d100 r5:8691d154
 r4:86c76800
[<80566b80>] (io_sq_thread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158)
Exception stack(0x868f9fb0 to 0x868f9ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80566b80
 r4:8691d100
Code: e28830a0 e50b3048 f593f000 e1a01003 (e1913f9f) 
---[ end trace d72d0ea187cd0b8c ]---