syz.2.18: attempt to access beyond end of device
loop2: rw=2049, sector=78000, nr_sectors = 32 limit=40427
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: 4497 Comm: syz.2.18 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 : f2fs_test_and_set_bit fs/f2fs/f2fs.h:2936 [inline]
pc : update_sit_entry+0x4d4/0xd20 fs/f2fs/segment.c:2227
lr : f2fs_block_unit_discard fs/f2fs/f2fs.h:4550 [inline]
lr : update_sit_entry+0x3b8/0xd20 fs/f2fs/segment.c:2226
sp : ffff800021d66950
x29: ffff800021d66980 x28: 0000000000000002 x27: dfff800000000000
x26: 000000000000000b x25: 0000000000000000 x24: 0000000000000003
x23: ffff0000fbea5210 x22: 0000000000000000 x21: ffff0000d305c168
x20: ffff0000d305c000 x19: 0000000000000001 x18: ffff800011b7bf60
x17: 0000000000000000 x16: ffff8000082d9364 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff0080000a348f44 x10: 0000000000000002 x9 : 0000000000000003
x8 : 0000000000000000 x7 : ffff80000a3488a0 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 f2fs_test_and_set_bit fs/f2fs/f2fs.h:2936 [inline]
 update_sit_entry+0x4d4/0xd20 fs/f2fs/segment.c:2227
 f2fs_allocate_data_block+0xcc4/0x2e54 fs/f2fs/segment.c:3275
 do_write_page+0x138/0x5e8 fs/f2fs/segment.c:3363
 f2fs_outplace_write_data+0xc8/0x1a8 fs/f2fs/segment.c:3429
 f2fs_do_write_data_page+0xbd0/0x10b4 fs/f2fs/data.c:2748
 f2fs_write_single_data_page+0x720/0x11d4 fs/f2fs/data.c:2863
 f2fs_write_cache_pages fs/f2fs/data.c:3159 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3330 [inline]
 f2fs_write_data_pages+0x1538/0x2794 fs/f2fs/data.c:3359
 do_writepages+0x2b0/0x504 mm/page-writeback.c:2491
 filemap_fdatawrite_wbc+0x124/0x174 mm/filemap.c:388
 __filemap_fdatawrite_range mm/filemap.c:421 [inline]
 file_write_and_wait_range+0x11c/0x1f4 mm/filemap.c:774
 f2fs_do_sync_file+0x4fc/0x1750 fs/f2fs/file.c:276
 f2fs_sync_file+0x110/0x15c fs/f2fs/file.c:394
 vfs_fsync_range+0x168/0x188 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2962 [inline]
 f2fs_file_write_iter+0x540/0x1c80 fs/f2fs/file.c:4927
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x3ec/0x7f0 fs/read_write.c:584
 ksys_pwrite64 fs/read_write.c:699 [inline]
 __do_sys_pwrite64 fs/read_write.c:709 [inline]
 __se_sys_pwrite64 fs/read_write.c:706 [inline]
 __arm64_sys_pwrite64+0x174/0x20c fs/read_write.c:706
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 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: f9400308 f85f83a9 8b090118 d343ff08 (38fb6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f9400308 	ldr	x8, [x24]
   4:	f85f83a9 	ldur	x9, [x29, #-8]
   8:	8b090118 	add	x24, x8, x9
   c:	d343ff08 	lsr	x8, x24, #3
* 10:	38fb6908 	ldrsb	w8, [x8, x27] <-- trapping instruction