REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 4106497 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2
REISERFS error (device loop8): vs-5150 search_by_key: invalid format found in block 532. Fsck?
Unable to handle kernel paging request at virtual address dfff800000000005
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
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
[dfff800000000005] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 7097 Comm: syz.8.479 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
pc : item_head fs/reiserfs/reiserfs.h:2200 [inline]
pc : tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
pc : direct2indirect+0x5c4/0xe88 fs/reiserfs/tail_conversion.c:119
lr : tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
lr : direct2indirect+0x58c/0xe88 fs/reiserfs/tail_conversion.c:119
sp : ffff800021dc6f80
x29: ffff800021dc70c0 x28: 0000000000000028 x27: dfff800000000000
x26: ffff800021dc7470 x25: ffff0000deff81e0 x24: ffff0000cdd9a000
x23: ffff800021dc7458 x22: ffff0000f6b18190 x21: ffff800021dc7450
x20: 0000000000000000 x19: 0000000000000178 x18: ffff800011abbcc0
x17: 6f662064696c6176 x16: ffff8000082d25ac x15: 0000000000000002
x14: 00000000fffffffe x13: 0000000000ff0100 x12: 0000000000080000
x11: 000000000000d85e x10: ffff800025bce000 x9 : ffff800008cc8b28
x8 : 0000000000000005 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800021dc6538 x4 : ffff8000151a4920 x3 : ffff800008a7e6f4
x2 : 0000000000000001 x1 : 0000000000000001 x0 : 0000000000000008
Call trace:
 reiserfs_node_data fs/reiserfs/reiserfs.h:2184 [inline]
 item_head fs/reiserfs/reiserfs.h:2200 [inline]
 tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
 direct2indirect+0x5c4/0xe88 fs/reiserfs/tail_conversion.c:119
 reiserfs_get_block+0x31dc/0x3524 fs/reiserfs/inode.c:949
 __block_write_begin_int+0x34c/0x13b8 fs/buffer.c:1991
 __block_write_begin+0x7c/0xa0 fs/buffer.c:2041
 reiserfs_write_begin+0x328/0x71c fs/reiserfs/inode.c:2775
 generic_perform_write+0x230/0x4b0 mm/filemap.c:3846
 __generic_file_write_iter+0x168/0x37c mm/filemap.c:3974
 generic_file_write_iter+0xb4/0x2b0 mm/filemap.c:4006
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x5ac/0x7c4 fs/read_write.c:584
 ksys_write+0x120/0x210 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 35001548 9100a29c b9800354 d343ff88 (387b6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	35001548 	cbnz	w8, 0x2a8
   4:	9100a29c 	add	x28, x20, #0x28
   8:	b9800354 	ldrsw	x20, [x26]
   c:	d343ff88 	lsr	x8, x28, #3
* 10:	387b6908 	ldrb	w8, [x8, x27] <-- trapping instruction