Unable to handle kernel NULL pointer dereference at virtual address 0000000000000aa8
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgdp=000000013166c000
[0000000000000aa8] pgd=08000001315ff003, p4d=08000001315ff003, pud=0800000130e64003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3723 Comm: syz-executor.2 Not tainted 6.1.0-rc5-syzkaller-32269-g9500fc6e9e60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022
pstate: 204000c5 (nzCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : mem_cgroup_track_foreign_dirty_slowpath+0x3c/0x1dc mm/memcontrol.c:4655
lr : mem_cgroup_track_foreign_dirty_slowpath+0x38/0x1dc mm/memcontrol.c:4646
sp : ffff800020113ac0
x29: ffff800020113ac0 x28: 00000000000081c0 x27: 0000000000000011
x26: 0000000000000094 x25: 0000000040000000 x24: 0000000000000100
x23: ffff80000d3a9000 x22: 00000000ffffa478 x21: fffffc0003c489c0
x20: ffff0000c3d77060 x19: 0000000000000000 x18: 00000000000003b9
x17: ffff80000c0ed83c x16: ffff80000dc18158 x15: ffff0000f1491a40
x14: 0000000000000000 x13: 00000000ffffffff x12: 0000000000040000
x11: 0000000000001372 x10: ffff8000169bd000 x9 : 0000000000000000
x8 : ffff0000c3d77000 x7 : ffff800008578c68 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000010 x1 : ffff80000cbcb6a8 x0 : 0000000000000001
Call trace:
 mem_cgroup_track_foreign_dirty_slowpath+0x3c/0x1dc
 mem_cgroup_track_foreign_dirty include/linux/memcontrol.h:1662 [inline]
 folio_account_dirtied+0x3a8/0x650 mm/page-writeback.c:2576
 __folio_mark_dirty+0xbc/0x180 mm/page-writeback.c:2616
 __set_page_dirty include/linux/pagemap.h:1053 [inline]
 mark_buffer_dirty+0x148/0x368 fs/buffer.c:1105
 block_truncate_page+0x874/0xa30 fs/buffer.c:2588
 fat_block_truncate_page+0x30/0x40 fs/fat/inode.c:341
 fat_setattr+0x610/0x73c fs/fat/file.c:546
 notify_change+0x758/0x7f0 fs/attr.c:420
 do_truncate+0x108/0x150 fs/open.c:65
 do_sys_ftruncate+0x1bc/0x1cc fs/open.c:193
 __do_sys_ftruncate fs/open.c:204 [inline]
 __se_sys_ftruncate fs/open.c:202 [inline]
 __arm64_sys_ftruncate+0x28/0x38 fs/open.c:202
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584
Code: aa1503e0 aa1403e1 9400006a f9400288 (f9455669) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa1503e0 	mov	x0, x21
   4:	aa1403e1 	mov	x1, x20
   8:	9400006a 	bl	0x1b0
   c:	f9400288 	ldr	x8, [x20]
* 10:	f9455669 	ldr	x9, [x19, #2728] <-- trapping instruction