8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 000000a0
pgd = 86bd3780
[000000a0] *pgd=86c44003, *pmd=fe441003
Internal error: Oops: 207 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 9547 Comm: iou-sqp-9545 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: 600b0113
sp : 86d39ee0  ip : 86965140  fp : 86d39f2c
r10: 00000000  r9 : 86d38000  r8 : 00000000
r7 : 86f75000  r6 : 86c57700  r5 : 86c57754  r4 : 86f75000
r3 : 000000a0  r2 : 86d38000  r1 : 000000a0  r0 : 86d39ef4
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 86bd3780  DAC: 00000000
Process iou-sqp-9545 (pid: 9547, stack limit = 0x86d38210)
Stack: (0x86d39ee0 to 0x86d3a000)
9ee0: 00000000 000000a0 00000000 86965140 802a6878 86d39ef4 86d39ef4 56b92eae
9f00: 00000001 86f75000 86c57754 86c57700 00000000 00000000 86d38000 00000000
9f20: 86d39fac 86d39f30 80566f50 80561e60 86c57704 81f744cc 82a06d00 00000000
9f40: 80384db8 86c57700 835eee00 86c57754 00000000 00000000 00000000 86965140
9f60: 802a6878 86d39f64 86d39f64 2d756f69 2d707173 35343539 80258400 56b92eae
9f80: 00000000 86c57700 80566b80 00000000 00000000 00000000 00000000 00000000
9fa0: 00000000 86d39fb0 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 r9:86d38000 r8:00000000 r7:00000000 r6:86c57700 r5:86c57754
 r4:86f75000
[<80566b80>] (io_sq_thread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158)
Exception stack(0x86d39fb0 to 0x86d39ff8)
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
 r4:86c57700
Code: e28830a0 e50b3048 f593f000 e1a01003 (e1913f9f) 
---[ end trace 0fedb7cb51a8a5e3 ]---