8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000018 when write
[00000018] *pgd=87208003, *pmd=e6ad7003
Internal error: Oops: a07 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 26540 Comm: syz-executor.0 Not tainted 6.8.0-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at pagemap_scan_init_bounce_buffer fs/proc/task_mmu.c:2399 [inline]
PC is at do_pagemap_scan+0x294/0x6b4 fs/proc/task_mmu.c:2445
LR is at kmalloc_array include/linux/slab.h:665 [inline]
LR is at pagemap_scan_init_bounce_buffer fs/proc/task_mmu.c:2394 [inline]
LR is at do_pagemap_scan+0x260/0x6b4 fs/proc/task_mmu.c:2445
pc : [<8059aec4>]    lr : [<8059ae90>]    psr: 20000013
sp : e0995e18  ip : 00000000  fp : e0995f04
r10: e0995e50  r9 : 872b0000  r8 : 00000000
r7 : 00000000  r6 : 00000000  r5 : 20ffc000  r4 : 86ea3600
r3 : 20ffc000  r2 : 00000000  r1 : 00000000  r0 : 00000010
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 8703f700  DAC: fffffffd
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 86ea3600 pointer offset 0 size 712
Register r5 information: non-paged memory
Register r6 information: NULL pointer
Register r7 information: NULL pointer
Register r8 information: NULL pointer
Register r9 information: slab task_struct start 872b0000 pointer offset 0 size 3072
Register r10 information: 2-page vmalloc region starting at 0xe0994000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796
Register r11 information: 2-page vmalloc region starting at 0xe0994000 allocated at kernel_clone+0xac/0x3cc kernel/fork.c:2796
Register r12 information: NULL pointer
Process syz-executor.0 (pid: 26540, stack limit = 0xe0994000)
Stack: (0xe0995e18 to 0xe0996000)
5e00:                                                       00000000 00000000
5e20: 10000000 200001c0 00000001 00000000 00000000 20ffc000 00000000 00000000
5e40: 00000000 00000000 00000000 00000000 00000060 00000000 00000000 00000000
5e60: 20ffc000 00000000 20ffc000 00000000 00000000 00000000 20000140 00000000
5e80: 00000000 10000000 ffffffff 00000000 00000000 00000000 00000000 00000000
5ea0: 00000000 00000000 00000000 00000000 00000000 00000000 00000010 00000000
5ec0: 00000000 00000000 20000140 00000000 c0606610 d2212bfa e0995ef4 c0606610
5ee0: 00000000 872f9181 200001c0 00000003 872b0000 872f9180 e0995f14 e0995f08
5f00: 8059b30c 8059ac3c e0995fa4 e0995f18 8050d3e8 8059b2f0 872b0000 00000001
5f20: ecac8b10 872b0000 e0995f44 e0995f38 81882504 818823d0 e0995f5c e0995f48
5f40: 8024c680 8027ad68 40000000 e0995fb0 e0995f84 e0995f60 80203138 8024c63c
5f60: 8261ca0c e0995fb0 0006b3f0 ecac8b10 80203020 d2212bfa e0995fac 00000000
5f80: 00000000 0014c2c8 00000036 80200288 872b0000 00000036 00000000 e0995fa8
5fa0: 80200060 8050d2dc 00000000 00000000 00000003 c0606610 200001c0 00000000
5fc0: 00000000 00000000 0014c2c8 00000036 7e97b32e 7e97b32f 003d0f00 76bd00fc
5fe0: 76bcff08 76bcfef8 000167f8 00050bc0 60000010 00000003 00000000 00000000
Backtrace: 
[<8059ac30>] (do_pagemap_scan) from [<8059b30c>] (do_pagemap_cmd+0x28/0x34 fs/proc/task_mmu.c:2512)
 r10:872f9180 r9:872b0000 r8:00000003 r7:200001c0 r6:872f9181 r5:00000000
 r4:c0606610
[<8059b2e4>] (do_pagemap_cmd) from [<8050d3e8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<8059b2e4>] (do_pagemap_cmd) from [<8050d3e8>] (do_vfs_ioctl fs/ioctl.c:858 [inline])
[<8059b2e4>] (do_pagemap_cmd) from [<8050d3e8>] (__do_sys_ioctl fs/ioctl.c:902 [inline])
[<8059b2e4>] (do_pagemap_cmd) from [<8050d3e8>] (sys_ioctl+0x118/0xc24 fs/ioctl.c:890)
[<8050d2d0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xe0995fa8 to 0xe0995ff0)
5fa0:                   00000000 00000000 00000003 c0606610 200001c0 00000000
5fc0: 00000000 00000000 0014c2c8 00000036 7e97b32e 7e97b32f 003d0f00 76bd00fc
5fe0: 76bcff08 76bcfef8 000167f8 00050bc0
 r10:00000036 r9:872b0000 r8:80200288 r7:00000036 r6:0014c2c8 r5:00000000
 r4:00000000
Code: e51b309c e51b208c e50b203c e3a02000 (e1c060f8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e51b309c 	ldr	r3, [fp, #-156]	@ 0xffffff64
   4:	e51b208c 	ldr	r2, [fp, #-140]	@ 0xffffff74
   8:	e50b203c 	str	r2, [fp, #-60]	@ 0xffffffc4
   c:	e3a02000 	mov	r2, #0
* 10:	e1c060f8 	strd	r6, [r0, #8] <-- trapping instruction