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 loop3): vs-5150 search_by_key: invalid format found in block 565. Fsck?
Unable to handle kernel paging request at virtual address dfff800000000000
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
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
[dfff800000000000] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4538 Comm: syz.3.36 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
pc : buffer_locked include/linux/buffer_head.h:123 [inline]
pc : fix_nodes+0x394/0x6ad4 fs/reiserfs/fix_node.c:2578
lr : fix_nodes+0x388/0x6ad4 fs/reiserfs/fix_node.c:2574
sp : ffff8000217f6ec0
x29: ffff8000217f7080 x28: dfff800000000000 x27: ffff8000217f71f8
x26: ffff8000217f6fc0 x25: ffff8000217f7700 x24: ffff8000217f71e8
x23: 00000000000001f2 x22: 00000000000001f2 x21: 0000000000000000
x20: ffff8000217f71f0 x19: ffff8000217f71e0 x18: 1fffe00033e7277e
x17: ffff80001537d000 x16: ffff8000082dcf38 x15: 0000000000000002
x14: 0000000000000001 x13: 1fffe0001b527c2b x12: 0000000000000000
x11: ff00800008cb2f00 x10: 0000000000000002 x9 : ffff0000ca6c5400
x8 : 0000000000000000 x7 : ffff80000825ab3c x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : ffff800008cb2ed0
x2 : 0000000000000000 x1 : 00000000000001f2 x0 : 00000000000001f2
Call trace:
 generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
 buffer_locked include/linux/buffer_head.h:123 [inline]
 fix_nodes+0x394/0x6ad4 fs/reiserfs/fix_node.c:2578
 reiserfs_cut_from_item+0x260/0x1a34 fs/reiserfs/stree.c:1742
 reiserfs_do_truncate+0x728/0xfd0 fs/reiserfs/stree.c:1973
 reiserfs_truncate_file+0x3a4/0xb04 fs/reiserfs/inode.c:2310
 reiserfs_setattr+0xad4/0x1014 fs/reiserfs/inode.c:3395
 notify_change+0xb5c/0xe20 fs/attr.c:499
 do_truncate+0x188/0x20c fs/open.c:65
 vfs_truncate+0x23c/0x2b0 fs/open.c:111
 do_sys_truncate+0xec/0x1b4 fs/open.c:134
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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: 97dffe4c 6b1702df 540001c1 d343fea8 (387c6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	97dffe4c 	bl	0xffffffffff7ff930
   4:	6b1702df 	cmp	w22, w23
   8:	540001c1 	b.ne	0x40  // b.any
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	387c6908 	ldrb	w8, [x8, x28] <-- trapping instruction