8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000018 when write
[00000018] *pgd=84cd3003, *pmd=ec9c8003
Internal error: Oops: a05 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 10490 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at pagemap_scan_init_bounce_buffer fs/proc/task_mmu.c:2414 [inline]
PC is at do_pagemap_scan+0x2ac/0x6f8 fs/proc/task_mmu.c:2460
LR is at kmalloc_noprof include/linux/slab.h:664 [inline]
LR is at kmalloc_array_noprof include/linux/slab.h:699 [inline]
LR is at pagemap_scan_init_bounce_buffer fs/proc/task_mmu.c:2409 [inline]
LR is at do_pagemap_scan+0x278/0x6f8 fs/proc/task_mmu.c:2460
pc : [<805a74c4>]    lr : [<805a7490>]    psr: 20000013
sp : dfa79e18  ip : dfa79e18  fp : dfa79f04
r10: 00000000  r9 : 00000000  r8 : 00000000
r7 : dfa79e50  r6 : 84040c00  r5 : 20165000  r4 : 84411200
r3 : 20ffb000  r2 : 00000000  r1 : 00000000  r0 : 00000010
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 84e24700  DAC: 00000000
Register r0 information: zero-size pointer
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab mm_struct start 84411200 pointer offset 0 size 712
Register r5 information: non-paged memory
Register r6 information: slab task_struct start 84040c00 pointer offset 0 size 3072
Register r7 information: 2-page vmalloc region starting at 0xdfa78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Register r8 information: NULL pointer
Register r9 information: NULL pointer
Register r10 information: NULL pointer
Register r11 information: 2-page vmalloc region starting at 0xdfa78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfa78000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Process syz-executor.0 (pid: 10490, stack limit = 0xdfa78000)
Stack: (0xdfa79e18 to 0xdfa7a000)
9e00:                                                       00000000 00000000
9e20: 00000000 00000000 200004c0 00000001 20165000 00000000 00000000 00000000
9e40: 00000000 00000000 00000000 00000000 00000060 00000000 00000000 00000000
9e60: 20165000 00000000 20ffb000 00000000 00000000 00000000 20000000 00000000
9e80: 00000000 10000000 ffffffff 00000000 00000000 00000000 00000000 00000000
9ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000010 00000000
9ec0: 00000000 00000000 20000000 00000000 c0606610 254ac03e dfa79ef4 c0606610
9ee0: 00000000 84cfa3c1 200004c0 84cfa3c0 00000003 84040c00 dfa79f14 dfa79f08
9f00: 805a7938 805a7224 dfa79fa4 dfa79f18 8051a27c 805a791c 84040c00 00000001
9f20: ecac8b10 84040c00 dfa79f44 dfa79f38 818f36bc 818f358c dfa79f5c dfa79f48
9f40: 8024d2c4 8027cc04 40000000 dfa79fb0 dfa79f84 dfa79f60 80202dc4 8024d280
9f60: 8261c90c dfa79fb0 0006bf00 ecac8b10 80202cac 254ac03e dfa79fac 00000000
9f80: 00000000 001542c8 00000036 8020029c 84040c00 00000036 00000000 dfa79fa8
9fa0: 80200060 8051a154 00000000 00000000 00000003 c0606610 200004c0 00000000
9fc0: 00000000 00000000 001542c8 00000036 7ecc0336 7ecc0337 003d0f00 76b950fc
9fe0: 76b94f08 76b94ef8 00016f30 000516d0 60000010 00000003 00000000 00000000
Call trace: 
[<805a7218>] (do_pagemap_scan) from [<805a7938>] (do_pagemap_cmd+0x28/0x34 fs/proc/task_mmu.c:2527)
 r10:84040c00 r9:00000003 r8:84cfa3c0 r7:200004c0 r6:84cfa3c1 r5:00000000
 r4:c0606610
[<805a7910>] (do_pagemap_cmd) from [<8051a27c>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<805a7910>] (do_pagemap_cmd) from [<8051a27c>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<805a7910>] (do_pagemap_cmd) from [<8051a27c>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<805a7910>] (do_pagemap_cmd) from [<8051a27c>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
[<8051a148>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa79fa8 to 0xdfa79ff0)
9fa0:                   00000000 00000000 00000003 c0606610 200004c0 00000000
9fc0: 00000000 00000000 001542c8 00000036 7ecc0336 7ecc0337 003d0f00 76b950fc
9fe0: 76b94f08 76b94ef8 00016f30 000516d0
 r10:00000036 r9:84040c00 r8:8020029c r7:00000036 r6:001542c8 r5:00000000
 r4:00000000
Code: e51b309c e51b108c e50b103c e3a01000 (e1c080f8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e51b309c 	ldr	r3, [fp, #-156]	@ 0xffffff64
   4:	e51b108c 	ldr	r1, [fp, #-140]	@ 0xffffff74
   8:	e50b103c 	str	r1, [fp, #-60]	@ 0xffffffc4
   c:	e3a01000 	mov	r1, #0
* 10:	e1c080f8 	strd	r8, [r0, #8] <-- trapping instruction