bcachefs (loop4): btree node scan found 7 nodes after overwrites
 done
bcachefs (loop4): check_topology...
Unable to handle kernel paging request at virtual address dfff80000000000e
KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
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
[dfff80000000000e] address between user and kernel address ranges
Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 UID: 0 PID: 7097 Comm: syz.4.106 Not tainted 6.14.0-rc3-syzkaller-ga1c24ab82279 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : __lock_acquire+0xfc/0x7904 kernel/locking/lockdep.c:5091
lr : lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851
sp : ffff80009f1467e0
x29: ffff80009f146aa0 x28: ffff800082990454 x27: 0000000000000001
x26: ffff0001b378c540 x25: 0000000000000000 x24: 0000000000000000
x23: 0000000000000000 x22: 1ffff00011f780cb x21: 0000000000000070
x20: 0000000000000001 x19: 0000000000000000 x18: ffff80009f146760
x17: 0000000000030340 x16: ffff8000832b5af8 x15: 0000000000000001
x14: 0000000000000000 x13: dfff800000000000 x12: ffff700013e28d24
x11: ffff80008046bf58 x10: ffff80008fbc0658 x9 : 00000000000000f3
x8 : 000000000000000e x7 : ffff800082990454 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000070
Call trace:
 __lock_acquire+0xfc/0x7904 kernel/locking/lockdep.c:5091 (P)
 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851
 six_lock_ip_waiter+0xb0/0x178 fs/bcachefs/six.c:553
 __btree_node_lock_nopath fs/bcachefs/btree_locking.h:229 [inline]
 btree_node_lock_nopath_nofail+0xb0/0x134 fs/bcachefs/btree_locking.h:252
 bch2_check_topology+0x5a8/0x878 fs/bcachefs/btree_gc.c:553
 bch2_run_recovery_pass+0xe4/0x1d4 fs/bcachefs/recovery_passes.c:226
 bch2_run_recovery_passes+0x260/0x92c fs/bcachefs/recovery_passes.c:291
 bch2_fs_recovery+0x20e0/0x32ec fs/bcachefs/recovery.c:936
 bch2_fs_start+0x32c/0x570 fs/bcachefs/super.c:1041
 bch2_fs_get_tree+0xa50/0x11d4 fs/bcachefs/fs.c:2203
 vfs_get_tree+0x90/0x28c fs/super.c:1814
 do_new_mount+0x278/0x900 fs/namespace.c:3560
 path_mount+0x590/0xe04 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount fs/namespace.c:4088 [inline]
 __arm64_sys_mount+0x4f4/0x5d0 fs/namespace.c:4088
 __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:744
 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600
Code: 9007baa8 b9465908 340090a8 d343fea8 (386d6908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	9007baa8 	adrp	x8, 0xf754000
   4:	b9465908 	ldr	w8, [x8, #1624]
   8:	340090a8 	cbz	w8, 0x121c
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	386d6908 	ldrb	w8, [x8, x13] <-- trapping instruction