loop0: detected capacity change from 0 to 2048
Unable to handle kernel paging request at virtual address dfff800000000005
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
Mem abort info:
  ESR = 0x0000000096000005
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x05: level 1 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[dfff800000000005] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 UID: 0 PID: 6486 Comm: syz.0.15 Not tainted 6.11.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : nilfs_btree_get_nonroot_node fs/nilfs2/btree.c:418 [inline]
pc : nilfs_btree_prepare_insert fs/nilfs2/btree.c:1091 [inline]
pc : nilfs_btree_insert+0x8b8/0x1af4 fs/nilfs2/btree.c:1252
lr : nilfs_btree_prepare_insert fs/nilfs2/btree.c:1089 [inline]
lr : nilfs_btree_insert+0x890/0x1af4 fs/nilfs2/btree.c:1252
sp : ffff80009e287220
x29: ffff80009e287380 x28: dfff800000000000 x27: 0000000000000000
x26: ffff0000c61b25b8 x25: ffff0000e07d3318 x24: ffff0000e07d0158
x23: 0000000000000003 x22: 0000000000000028 x21: ffff0000e07d3319
x20: 0000000000000002 x19: ffff0000c61b2580 x18: 1fffe000368b3fe6
x17: ffff80008d84d000 x16: ffff80008028f95c x15: 0000000000000001
x14: 1fffe00019cc0d1a x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000000001 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : 0000000000000005 x7 : ffff800081f1c7e8 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000803520d0
x2 : 0000000000000001 x1 : 0000000000000002 x0 : 0000000000000001
Call trace:
 nilfs_btree_get_nonroot_node fs/nilfs2/btree.c:418 [inline]
 nilfs_btree_prepare_insert fs/nilfs2/btree.c:1091 [inline]
 nilfs_btree_insert+0x8b8/0x1af4 fs/nilfs2/btree.c:1252
 nilfs_bmap_do_insert fs/nilfs2/bmap.c:129 [inline]
 nilfs_bmap_insert+0x1f8/0x35c fs/nilfs2/bmap.c:155
 nilfs_get_block+0x33c/0x7ec fs/nilfs2/inode.c:101
 __block_write_begin_int+0x580/0x166c fs/buffer.c:2125
 __block_write_begin fs/buffer.c:2174 [inline]
 block_write_begin+0x98/0x11c fs/buffer.c:2235
 nilfs_write_begin+0xa8/0x114 fs/nilfs2/inode.c:262
 generic_perform_write+0x2e8/0x8e0 mm/filemap.c:4019
 __generic_file_write_iter+0xfc/0x204 mm/filemap.c:4121
 generic_file_write_iter+0xb8/0x2b4 mm/filemap.c:4147
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0x940/0xc80 fs/read_write.c:590
 ksys_write+0x15c/0x26c fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:652
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: 97ae2b66 f94002c8 9100a116 d343fec8 (387c6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	97ae2b66 	bl	0xfffffffffeb8ad98
   4:	f94002c8 	ldr	x8, [x22]
   8:	9100a116 	add	x22, x8, #0x28
   c:	d343fec8 	lsr	x8, x22, #3
* 10:	387c6908 	ldrb	w8, [x8, x28] <-- trapping instruction