BTRFS critical (device loop2 state S): unable to find chunk map for logical 0 length 4096
BTRFS critical (device loop2 state S): unable to find chunk map for logical 0 length 4096
Unable to handle kernel paging request at virtual address dfff800000000003
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
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
[dfff800000000003] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1]  SMP
Modules linked in:
CPU: 0 UID: 0 PID: 6642 Comm: syz.2.13 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : btrfs_root_node+0x94/0x3fc fs/btrfs/ctree.c:193
lr : rcu_read_lock include/linux/rcupdate.h:842 [inline]
lr : btrfs_root_node+0x94/0x3fc fs/btrfs/ctree.c:192
sp : ffff80009f047430
x29: ffff80009f047440 x28: ffff80008b2738c0 x27: ffff8000927e0000
x26: 0000000000000001 x25: ffff8000927e0000 x24: ffff80008b273f80
x23: dfff800000000000 x22: 0000000000000001 x21: 0000000000000003
x20: ffff80008f4c7c60 x19: 0000000000000018 x18: 0000000000000000
x17: 0000000000000000 x16: ffff80008ad9af48 x15: 0000000000000001
x14: 1fffe0001a13300d x13: 0000000000000000 x12: 0000000000000000
x11: 0000000000080000 x10: 000000000007ffff x9 : ffff8000a474c000
x8 : 0000000000080000 x7 : ffff800082263788 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : ffff80008b3c6e00 x0 : 0000000000000001
Call trace:
 rcu_read_lock include/linux/rcupdate.h:842 [inline] (P)
 btrfs_root_node+0x94/0x3fc fs/btrfs/ctree.c:192 (P)
 btrfs_read_lock_root_node+0x30/0xf0 fs/btrfs/locking.c:263
 btrfs_build_ref_tree+0xe4/0xfc0 fs/btrfs/ref-verify.c:1006
 open_ctree+0x18fc/0x229c fs/btrfs/disk-io.c:3591
 btrfs_fill_super+0x184/0x2c0 fs/btrfs/super.c:972
 btrfs_get_tree_super fs/btrfs/super.c:1898 [inline]
 btrfs_get_tree+0xc4c/0x1038 fs/btrfs/super.c:2093
 vfs_get_tree+0x90/0x28c fs/super.c:1759
 fc_mount+0x24/0xac fs/namespace.c:1293
 btrfs_get_tree_subvol fs/btrfs/super.c:2051 [inline]
 btrfs_get_tree+0x4d4/0x1038 fs/btrfs/super.c:2094
 vfs_get_tree+0x90/0x28c fs/super.c:1759
 do_new_mount+0x228/0x814 fs/namespace.c:3879
 path_mount+0x5b4/0xde0 fs/namespace.c:4206
 do_mount fs/namespace.c:4219 [inline]
 __do_sys_mount fs/namespace.c:4430 [inline]
 __se_sys_mount fs/namespace.c:4407 [inline]
 __arm64_sys_mount+0x3e8/0x468 fs/namespace.c:4407
 __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+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 340000fa 978d39d0 36000120 97930109 (38776aa8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	340000fa 	cbz	w26, 0x1c
   4:	978d39d0 	bl	0xfffffffffe34e744
   8:	36000120 	tbz	w0, #0, 0x2c
   c:	97930109 	bl	0xfffffffffe4c0430
* 10:	38776aa8 	ldrb	w8, [x21, x23] <-- trapping instruction