__invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Unable to handle kernel paging request at virtual address dfff80001fffffff
Mem abort info:
  ESR = 0x0000000096000007
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x07: level 3 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000007
  CM = 0, WnR = 0
[dfff80001fffffff] address between user and kernel address ranges
Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 5377 Comm: syz.4.324 Not tainted 5.15.186-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline]
pc : prepare_error_buf+0x73c/0x1790 fs/reiserfs/prints.c:229
lr : prepare_error_buf+0x470/0x1790 fs/reiserfs/prints.c:230
sp : ffff800022227080
x29: ffff800022227200 x28: ffff80001af0395e x27: dfff800000000000
x26: ffff800022227280 x25: 00000000ffffffff x24: ffff80001af02a5e
x23: 000000000000004b x22: ffff800022227298 x21: ffff800022227260
x20: ffffffffffffffe2 x19: ffff80001449e3e0 x18: 0000000000000001
x17: 0000000000000000 x16: ffff800008bfd834 x15: 000000000000007a
x14: 0000000000ff0100 x13: ffffffffffffffff x12: 0000000000ff0100
x11: 0000000000000001 x10: 0000000000000000 x9 : ffff800008bfda5c
x8 : 000000001fffffff x7 : 20726f6620686372 x6 : 7261657320666f20
x5 : ffff80001af02a5e x4 : ffff80001af0395e x3 : ffff80000a92b584
x2 : 000000000000000f x1 : 00000000ffffffe0 x0 : ffff800022227288
Call trace:
 scnprintf_cpu_key fs/reiserfs/prints.c:95 [inline]
 prepare_error_buf+0x73c/0x1790 fs/reiserfs/prints.c:229
 __reiserfs_error+0xd0/0x28c fs/reiserfs/prints.c:396
 reiserfs_do_truncate+0x3a8/0x1020 fs/reiserfs/stree.c:1930
 reiserfs_truncate_file+0x328/0x6e4 fs/reiserfs/inode.c:2318
 reiserfs_truncate_failed_write fs/reiserfs/inode.c:2751 [inline]
 reiserfs_write_begin+0x548/0x654 fs/reiserfs/inode.c:2823
 generic_perform_write+0x204/0x480 mm/filemap.c:3785
 __generic_file_write_iter+0x23c/0x454 mm/filemap.c:3912
 generic_file_write_iter+0xb0/0x1b4 mm/filemap.c:3944
 do_iter_readv_writev+0x3a0/0x4f8 fs/read_write.c:-1
 do_iter_write+0x1c4/0x670 fs/read_write.c:855
 vfs_writev fs/read_write.c:928 [inline]
 do_pwritev+0x1c8/0x2fc fs/read_write.c:1025
 __do_sys_pwritev2 fs/read_write.c:1084 [inline]
 __se_sys_pwritev2 fs/read_write.c:1075 [inline]
 __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: f94002b9 cb180294 b40004b9 d343ff28 (38fb6908) 
---[ end trace ab27aa2ac4442f4f ]---
----------------
Code disassembly (best guess):
   0:	f94002b9 	ldr	x25, [x21]
   4:	cb180294 	sub	x20, x20, x24
   8:	b40004b9 	cbz	x25, 0x9c
   c:	d343ff28 	lsr	x8, x25, #3
* 10:	38fb6908 	ldrsb	w8, [x8, x27] <-- trapping instruction