syz.4.242: attempt to access beyond end of device
loop4: rw=2049, sector=79872, nr_sectors = 2048 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: 5307 Comm: syz.4.242 Not tainted 6.1.144-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 : f2fs_test_and_set_bit fs/f2fs/f2fs.h:2933 [inline]
pc : update_sit_entry+0x4d4/0xd20 fs/f2fs/segment.c:2227
lr : f2fs_block_unit_discard fs/f2fs/f2fs.h:4547 [inline]
lr : update_sit_entry+0x3b8/0xd20 fs/f2fs/segment.c:2226
sp : ffff800021736910
x29: ffff800021736940 x28: 0000000000000002 x27: dfff800000000000
x26: 0000000000000004 x25: 0000000000000000 x24: 0000000000000003
x23: ffff0000f65870c0 x22: 0000000000000000 x21: ffff0000d33e8168
x20: ffff0000d33e8000 x19: 0000000000000001 x18: ffff800011aabce0
x17: 0000000000000000 x16: ffff8000082d2400 x15: 0000000000000002
x14: 00000000ffffffff x13: 0000000000ff0100 x12: 0000000000ff0100
x11: ff0080000a304cb4 x10: 0000000000000002 x9 : 0000000000000003
x8 : 0000000000000000 x7 : ffff80000a304610 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:2933 [inline]
 update_sit_entry+0x4d4/0xd20 fs/f2fs/segment.c:2227
 f2fs_allocate_data_block+0xcc4/0x2e50 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+0xbb8/0x10a8 fs/f2fs/data.c:2732
 f2fs_write_single_data_page+0x70c/0x11c0 fs/f2fs/data.c:2847
 f2fs_write_cache_pages fs/f2fs/data.c:3143 [inline]
 __f2fs_write_data_pages fs/f2fs/data.c:3299 [inline]
 f2fs_write_data_pages+0x1434/0x2560 fs/f2fs/data.c:3326
 do_writepages+0x2c0/0x4fc 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+0x110/0x1d8 mm/filemap.c:774
 f2fs_do_sync_file+0x4e0/0x1740 fs/f2fs/file.c:278
 f2fs_sync_file+0x110/0x15c fs/f2fs/file.c:396
 vfs_fsync_range+0x168/0x188 fs/sync.c:188
 generic_write_sync include/linux/fs.h:2962 [inline]
 f2fs_file_write_iter+0x54c/0x1d54 fs/f2fs/file.c:4877
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x5ac/0x7c4 fs/read_write.c:584
 ksys_write+0x120/0x210 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+0x7c/0x90 fs/read_write.c:646
 __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: 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