8<--- cut here --- Unable to handle kernel NULL pointer dereference at virtual address 000000a0 pgd = 86572c80 [000000a0] *pgd=86f36003, *pmd=fe54b003 Internal error: Oops: 207 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 6147 Comm: iou-sqp-6140 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 : 8780bee0 ip : 86960000 fp : 8780bf2c r10: 00000000 r9 : 8780a000 r8 : 00000000 r7 : 867b4800 r6 : 86ec7e00 r5 : 86ec7e54 r4 : 867b4800 r3 : 000000a0 r2 : 8780a000 r1 : 000000a0 r0 : 8780bef4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86572c80 DAC: 00000000 Process iou-sqp-6140 (pid: 6147, stack limit = 0x8780a210) Stack: (0x8780bee0 to 0x8780c000) bee0: 00000000 000000a0 00000000 86960000 802a6878 8780bef4 8780bef4 56b92eae bf00: 00000001 867b4800 86ec7e54 86ec7e00 00000000 00000000 8780a000 00000000 bf20: 8780bfac 8780bf30 80566f50 80561e60 86ec7e04 81f744cc 82a06d00 00000000 bf40: 80384db8 86ec7e00 8561bc80 86ec7e54 00000000 00000000 00000000 86960000 bf60: 802a6878 8780bf64 8780bf64 2d756f69 2d707173 30343136 80258400 56b92eae bf80: 00000000 86ec7e00 80566b80 00000000 00000000 00000000 00000000 00000000 bfa0: 00000000 8780bfb0 80200114 80566b8c 00000000 00000000 00000000 00000000 bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bfe0: 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 r9:8780a000 r8:00000000 r7:00000000 r6:86ec7e00 r5:86ec7e54 r4:867b4800 [<80566b80>] (io_sq_thread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158) Exception stack(0x8780bfb0 to 0x8780bff8) bfa0: 00000000 00000000 00000000 00000000 bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80566b80 r4:86ec7e00 Code: e28830a0 e50b3048 f593f000 e1a01003 (e1913f9f) ---[ end trace 324a44759a86d623 ]---