syzbot

REISERFS (device loop0): Using tea hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
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Unable to handle kernel paging request at virtual address dfff800000000047
KASAN: null-ptr-deref in range [0x0000000000000238-0x000000000000023f]
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
[dfff800000000047] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4294 Comm: syz-executor262 Not tainted 6.1.139-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : scnprintf_block_head fs/reiserfs/prints.c:152 [inline]
pc : prepare_error_buf+0xf9c/0x1850 fs/reiserfs/prints.c:245
lr : prepare_error_buf+0x70c/0x1850 fs/reiserfs/prints.c:246
sp : ffff800020636ca0
x29: ffff800020636e20 x28: ffff800020636ec0 x27: ffff80001c3fa9b9
x26: ffff800020636d20 x25: ffff80001c3f9aa0 x24: ffff80001c3f9ab9
x23: 000000000000007a x22: ffff80001c3fa9a0 x21: 000000000000023e
x20: ffff8000153bdba0 x19: dfff800000000000 x18: 0000000000000000
x17: ffff8000181a0000 x16: ffff8000082e7784 x15: 0000000000000000
x14: 000000000000007a x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff00800008ca3b30 x10: 0000000000000000 x9 : ffff800008ca3b30
x8 : 0000000000000047 x7 : 20736e6961746e6f x6 : 6961746e6f632029
x5 : ffff80001c3f9ab9 x4 : ffff80001c3fa9b9 x3 : ffff80001180f1c8
x2 : 000000000000000b x1 : 00000000ffffffc8 x0 : ffff800020636ec8
Call trace:
 scnprintf_block_head fs/reiserfs/prints.c:152 [inline]
 prepare_error_buf+0xf9c/0x1850 fs/reiserfs/prints.c:245
 reiserfs_printk+0xc4/0x114 fs/reiserfs/prints.c:312
 print_leaf fs/reiserfs/prints.c:496 [inline]
 print_block+0x308/0x148c fs/reiserfs/prints.c:626
 reiserfs_cut_from_item+0x1540/0x1a58 fs/reiserfs/stree.c:1726
 reiserfs_do_truncate+0x738/0x1020 fs/reiserfs/stree.c:1973
 reiserfs_truncate_file+0x5c0/0xaf4 fs/reiserfs/inode.c:2310
 reiserfs_file_release+0x710/0x894 fs/reiserfs/file.c:109
 __fput+0x1bc/0x7c0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1ec/0x270 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x544/0x19a8 kernel/exit.c:871
 do_group_exit+0x194/0x22c kernel/exit.c:1021
 __do_sys_exit_group kernel/exit.c:1032 [inline]
 __se_sys_exit_group kernel/exit.c:1030 [inline]
 __wake_up_parent+0x0/0x60 kernel/exit.c:1030
 __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: 97f0c854 f94002a8 9100a115 d343fea8 (38736908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	97f0c854 	bl	0xffffffffffc32150
   4:	f94002a8 	ldr	x8, [x21]
   8:	9100a115 	add	x21, x8, #0x28
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38736908 	ldrb	w8, [x8, x19] <-- trapping instruction