8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000018 when write
[00000018] *pgd=84ce9003, *pmd=e9504003
Internal error: Oops: a07 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 17359 Comm: syz-executor.0 Not tainted 6.7.0-rc8-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at pagemap_scan_init_bounce_buffer fs/proc/task_mmu.c:2383 [inline]
PC is at do_pagemap_scan+0x308/0x698 fs/proc/task_mmu.c:2430
LR is at 0x10
pc : [<80581334>]    lr : [<00000010>]    psr: 20000013
sp : eacd5dd0  ip : 00000000  fp : eacd5eb4
r10: eacd5e00  r9 : 00000000  r8 : 88650c00
r7 : 00000000  r6 : 88427300  r5 : 20ffa000  r4 : 00000000
r3 : 20ffa000  r2 : 00000000  r1 : 00000000  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8ad95600  DAC: 00000000
Register r0 information: NULL pointer
Register r1 information: NULL pointer
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: NULL pointer
Register r5 information: non-paged memory
Register r6 information: slab mm_struct start 88427300 pointer offset 0 size 712
Register r7 information: NULL pointer
Register r8 information: slab task_struct start 88650c00 pointer offset 0 size 3072
Register r9 information: NULL pointer
Register r10 information: 2-page vmalloc region starting at 0xeacd4000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907
Register r11 information: 2-page vmalloc region starting at 0xeacd4000 allocated at kernel_clone+0xac/0x41c kernel/fork.c:2907
Register r12 information: NULL pointer
Process syz-executor.0 (pid: 17359, stack limit = 0xeacd4000)
Stack: (0xeacd5dd0 to 0xeacd6000)
5dc0:                                     00000000 00000000 05000000 20000100
5de0: 20ffa000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5e00: 00000060 00000000 00000000 00000000 20ffa000 00000000 20ffa000 00000000
5e20: 00000000 00000000 20000080 00000000 00000000 05000000 ffffffff 00000000
5e40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5e60: 00000000 00000000 00000010 00000000 00000000 00000000 20000080 00000000
5e80: c0606610 2b383831 eacd5ea4 c0606610 00000000 84101541 20000100 84101540
5ea0: 00000003 88650c00 eacd5ec4 eacd5eb8 805816ec 80581038 eacd5fa4 eacd5ec8
5ec0: 804f96a8 805816d0 00050af0 00000000 00000000 00000000 eacd5f04 eacd5ee8
5ee0: 8020c0ac 8020d078 00000000 00000001 8185e128 ecac8b10 eacd5f44 eacd5f08
5f00: 8020d100 8020c094 00000000 00000000 8020c954 eacd5fac 88650c00 00000001
5f20: ecac8b10 88650c00 eacd5f44 eacd5f38 81852ae8 818529b8 eacd5f5c eacd5f48
5f40: 8024c5d8 802792c8 40000000 eacd5fb0 eacd5f84 eacd5f60 802030e4 8024c594
5f60: 8261c928 eacd5fb0 0006b320 ecac8b10 80202fcc 2b383831 eacd5fac 00000000
5f80: 00000000 0014c2c0 00000036 80200288 88650c00 00000036 00000000 eacd5fa8
5fa0: 80200060 804f959c 00000000 00000000 00000003 c0606610 20000100 00000000
5fc0: 00000000 00000000 0014c2c0 00000036 7ebe932e 7ebe932f 003d0f00 76b6f0fc
5fe0: 76b6ef08 76b6eef8 000167a0 00050af0 60000010 00000003 00000000 00000000
Backtrace: 
[<8058102c>] (do_pagemap_scan) from [<805816ec>] (do_pagemap_cmd+0x28/0x34 fs/proc/task_mmu.c:2494)
 r10:88650c00 r9:00000003 r8:84101540 r7:20000100 r6:84101541 r5:00000000
 r4:c0606610
[<805816c4>] (do_pagemap_cmd) from [<804f96a8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<805816c4>] (do_pagemap_cmd) from [<804f96a8>] (do_vfs_ioctl fs/ioctl.c:831 [inline])
[<805816c4>] (do_pagemap_cmd) from [<804f96a8>] (__do_sys_ioctl fs/ioctl.c:869 [inline])
[<805816c4>] (do_pagemap_cmd) from [<804f96a8>] (sys_ioctl+0x118/0xb58 fs/ioctl.c:857)
[<804f9590>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xeacd5fa8 to 0xeacd5ff0)
5fa0:                   00000000 00000000 00000003 c0606610 20000100 00000000
5fc0: 00000000 00000000 0014c2c0 00000036 7ebe932e 7ebe932f 003d0f00 76b6f0fc
5fe0: 76b6ef08 76b6eef8 000167a0 00050af0
 r10:00000036 r9:88650c00 r8:80200288 r7:00000036 r6:0014c2c0 r5:00000000
 r4:00000000
Code: e51b2098 e51b108c e50b103c e3a01000 (e1ce00f8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e51b2098 	ldr	r2, [fp, #-152]	@ 0xffffff68
   4:	e51b108c 	ldr	r1, [fp, #-140]	@ 0xffffff74
   8:	e50b103c 	str	r1, [fp, #-60]	@ 0xffffffc4
   c:	e3a01000 	mov	r1, #0
* 10:	e1ce00f8 	strd	r0, [lr, #8] <-- trapping instruction