Unable to handle kernel paging request at virtual address dfff800000000005
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000005] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 7093 Comm: syz.1.87 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : bfs_move_block fs/bfs/file.c:43 [inline]
pc : bfs_move_blocks fs/bfs/file.c:57 [inline]
pc : bfs_get_block+0x498/0x9d4 fs/bfs/file.c:126
lr : __getblk include/linux/buffer_head.h:380 [inline]
lr : sb_getblk include/linux/buffer_head.h:386 [inline]
lr : bfs_move_block fs/bfs/file.c:42 [inline]
lr : bfs_move_blocks fs/bfs/file.c:57 [inline]
lr : bfs_get_block+0x470/0x9d4 fs/bfs/file.c:126
sp : ffff8000a38a6170
x29: ffff8000a38a61e0 x28: ffff0000fc480158 x27: dfff800000000000
x26: 0000000000000028 x25: ffff0000f9265e68 x24: 0000000000000000
x23: ffff0000fc480018 x22: ffff0000f92a5000 x21: 1fffe0001f89002b
x20: 0000000000000200 x19: 000000000000000a x18: 00000000ffffffff
x17: ffff800093599000 x16: ffff800080544d7c x15: 0000000000000001
x14: 1fffffbff8742c9e x13: 0000000000000000 x12: 0000000000000000
x11: ffff7fbff8742c9f x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000005 x7 : 0000000000000000 x6 : 0000000000000000
x5 : 0000000000000020 x4 : 0000000000000008 x3 : ffff800080eb34e8
x2 : 0000000000000001 x1 : 0000000000000040 x0 : 0000000000000000
Call trace:
 bfs_move_block fs/bfs/file.c:43 [inline] (P)
 bfs_move_blocks fs/bfs/file.c:57 [inline] (P)
 bfs_get_block+0x498/0x9d4 fs/bfs/file.c:126 (P)
 __block_write_begin_int+0x53c/0x15e8 fs/buffer.c:2145
 block_write_begin+0xa4/0x12c fs/buffer.c:2256
 bfs_write_begin+0x48/0xec fs/bfs/file.c:180
 generic_perform_write+0x244/0x7bc mm/filemap.c:4314
 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4431
 generic_file_write_iter+0x10c/0x47c mm/filemap.c:4457
 __kernel_write_iter+0x310/0x738 fs/read_write.c:619
 __kernel_write+0xe0/0x130 fs/read_write.c:639
 __dump_emit fs/coredump.c:1220 [inline]
 dump_emit+0x220/0x31c fs/coredump.c:1258
 elf_core_dump+0x250c/0x2fbc fs/binfmt_elf.c:2090
 coredump_write+0x1084/0x1900 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x2674/0x30ac fs/coredump.c:1200
 get_signal+0xe38/0x12f8 kernel/signal.c:3019
 arch_do_signal_or_restart+0x1b8/0x46d4 arch/arm64/kernel/signal.c:1619
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x88/0x18c kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 exit_to_user_mode_prepare_legacy include/linux/irq-entry-common.h:242 [inline]
 arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:81 [inline]
 el0_da+0x180/0x248 arch/arm64/kernel/entry-common.c:541
 el0t_64_sync_handler+0x90/0x12c arch/arm64/kernel/entry-common.c:746
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
Code: 97e6365e 9100a31a f94012d4 d343ff48 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	97e6365e 	bl	0xffffffffff98d978
   4:	9100a31a 	add	x26, x24, #0x28
   8:	f94012d4 	ldr	x20, [x22, #32]
   c:	d343ff48 	lsr	x8, x26, #3
* 10:	387b6908 	ldrb	w8, [x8, x27] <-- trapping instruction