BTRFS info (device loop0): enabling ssd optimizations
Unable to handle kernel paging request at virtual address dfff800000000003
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
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
[dfff800000000003] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4463 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : btrfs_root_node+0x7c/0x3d4 fs/btrfs/ctree.c:150
lr : rcu_read_lock include/linux/rcupdate.h:792 [inline]
lr : btrfs_root_node+0x7c/0x3d4 fs/btrfs/ctree.c:149
sp : ffff8000216672e0
x29: ffff8000216672e0 x28: dfff800000000000 x27: dfff800000000000
x26: 0000000000000007 x25: 0000000000000001 x24: ffff8000120eac60
x23: ffff8000120eaca0 x22: 0000000000000001 x21: 0000000000000003
x20: ffff800017d5d000 x19: 0000000000000018 x18: 1fffe00033e7697e
x17: 0000000000000000 x16: ffff800011b8ee98 x15: ffff800008a3fb04
x14: 0000000000000001 x13: 1ffff00002a70071 x12: 00000000abaa9e8a
x11: ff00800009f91d3c x10: 0000000000000000 x9 : ffff800009f91d3c
x8 : ffff0000d208d400 x7 : ffff800009fa566c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : ffff8000121e0280 x0 : 0000000000000001
Call trace:
 rcu_read_lock include/linux/rcupdate.h:792 [inline]
 btrfs_root_node+0x7c/0x3d4 fs/btrfs/ctree.c:149
 btrfs_read_lock_root_node+0x70/0x374 fs/btrfs/locking.c:277
 btrfs_build_ref_tree+0xf8/0x1020 fs/btrfs/ref-verify.c:1002
 open_ctree+0x1990/0x229c fs/btrfs/disk-io.c:3787
 btrfs_fill_super+0x1d8/0x2fc fs/btrfs/super.c:1469
 btrfs_mount_root+0x79c/0x7ec fs/btrfs/super.c:1834
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1573
 fc_mount fs/namespace.c:1048 [inline]
 vfs_kern_mount+0xdc/0x178 fs/namespace.c:1078
 btrfs_mount+0x2dc/0x974 fs/btrfs/super.c:1894
 legacy_get_tree+0xd8/0x174 fs/fs_context.c:632
 vfs_get_tree+0x90/0x278 fs/super.c:1573
 do_new_mount+0x228/0x804 fs/namespace.c:3078
 path_mount+0x5ac/0xe6c fs/namespace.c:3408
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount fs/namespace.c:3606 [inline]
 __arm64_sys_mount+0x4a0/0x5a0 fs/namespace.c:3606
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 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: 340000f9 978f3056 36000120 97948244 (387c6aa8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	340000f9 	cbz	w25, 0x1c
   4:	978f3056 	bl	0xfffffffffe3cc15c
   8:	36000120 	tbz	w0, #0, 0x2c
   c:	97948244 	bl	0xfffffffffe52091c
* 10:	387c6aa8 	ldrb	w8, [x21, x28] <-- trapping instruction