REISERFS warning: reiserfs-5093 is_leaf: item entry count seems wrong *3.5*[2 1 0(1) DIR], item_len 35, item_location 4029, free_space(entry_count) 2
REISERFS error (device loop2): vs-5150 search_by_key: invalid format found in block 532. Fsck?
REISERFS (device loop2): Remounting filesystem read-only
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028
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=00000001134b7000
[0000000000000028] pgd=080000010bfaf003, p4d=080000010bfaf003, pud=0800000105e77003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 3895 Comm: syz.2.15 Not tainted 6.1.120-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: a0400005 (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+0x260/0x3e8 fs/reiserfs/tail_conversion.c:119
lr : direct2indirect+0x244/0x3e8 fs/reiserfs/tail_conversion.c:115
sp : ffff800013ff3880
x29: ffff800013ff38e0 x28: 0000000000000000 x27: ffff800013ff3a48
x26: 0000000100000fff x25: 0000000000001000 x24: ffff0000c6ab0c00
x23: ffff0000cd5b2e70 x22: ffff0000d3571000 x21: ffff800013ff3a40
x20: 00000000ffffffff x19: ffff0000cd568de0 x18: ffff80000a3fca64
x17: 0000000000000012 x16: ffffffffffffffff x15: 0000000000000004
x14: 0000000000001fff x13: ffff80000baa0ef0 x12: 0000000000000003
x11: 0000000000000003 x10: 0000000000000018 x9 : 0000000000000000
x8 : 0000000000000000 x7 : 0000000000000000 x6 : ffff80000a3bba30
x5 : 0000000000000000 x4 : 0000000000000080 x3 : 0000000000000000
x2 : 0000000000000000 x1 : 00000000fffffffb x0 : 00000000fffffffe
Call trace:
 tp_item_head fs/reiserfs/reiserfs.h:2226 [inline]
 direct2indirect+0x260/0x3e8 fs/reiserfs/tail_conversion.c:119
 reiserfs_get_block+0xd9c/0xfc4 fs/reiserfs/inode.c:949
 __block_write_begin_int+0x108/0x730 fs/buffer.c:1991
 __block_write_begin+0x24/0x30 fs/buffer.c:2041
 reiserfs_write_begin+0x104/0x284 fs/reiserfs/inode.c:2775
 generic_perform_write+0x9c/0x1bc mm/filemap.c:3845
 __generic_file_write_iter+0x98/0x144 mm/filemap.c:3973
 generic_file_write_iter+0x54/0xd8 mm/filemap.c:4005
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x210/0x2a4 fs/read_write.c:584
 ksys_write+0x78/0xe4 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+0x1c/0x28 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x40/0x104 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0xb4/0xf0 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x24/0x8c arch/arm64/kernel/syscall.c:204
 el0_svc+0x34/0x100 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: 5280030a 8b081368 f9400109 b9800908 (f9401529) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	5280030a 	mov	w10, #0x18                  	// #24
   4:	8b081368 	add	x8, x27, x8, lsl #4
   8:	f9400109 	ldr	x9, [x8]
   c:	b9800908 	ldrsw	x8, [x8, #8]
* 10:	f9401529 	ldr	x9, [x9, #40] <-- trapping instruction