Oops: general protection fault, probably for non-canonical address 0xdffffc0000000013: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000098-0x000000000000009f]
CPU: 0 UID: 0 PID: 1149 Comm: kworker/u4:11 Not tainted 6.13.0-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: btree_update btree_interior_update_work
RIP: 0010:btree_path_lock_root fs/bcachefs/btree_iter.c:732 [inline]
RIP: 0010:bch2_btree_path_traverse_one+0x94a/0x2940 fs/bcachefs/btree_iter.c:1183
Code: 89 44 24 60 42 80 3c 20 00 74 08 4c 89 ef e8 ed 3b e8 fd 49 8b 45 00 48 89 44 24 48 48 8d 90 98 00 00 00 48 89 d0 48 c1 e8 03 <42> 0f b6 04 20 84 c0 48 89 94 24 80 00 00 00 0f 85 ee 10 00 00 4c
RSP: 0018:ffffc900026f67a0 EFLAGS: 00010202
RAX: 0000000000000013 RBX: 0000000000000000 RCX: ffff888035ad4880
RDX: 0000000000000098 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900026f6a90 R08: ffffffff841da670 R09: ffffffff841d86e9
R10: 0000000000000002 R11: ffff888035ad4880 R12: dffffc0000000000
R13: ffff888052f815d8 R14: ffff888052210380 R15: 000000000000314d
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562ad1eff058 CR3: 0000000011f28000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:247 [inline]
 bch2_btree_iter_traverse+0x699/0xc30 fs/bcachefs/btree_iter.c:1880
 bch2_btree_insert_trans fs/bcachefs/btree_update.c:649 [inline]
 bch2_btree_insert_clone_trans+0x6dc/0xad0 fs/bcachefs/btree_update.c:559
 bch2_trans_update_buffered fs/bcachefs/btree_update.h:148 [inline]
 bch2_bucket_backpointer_mod fs/bcachefs/backpointers.h:107 [inline]
 bch2_trigger_pointer fs/bcachefs/buckets.c:595 [inline]
 __trigger_extent+0x307c/0x4fa0 fs/bcachefs/buckets.c:740
 bch2_trigger_extent+0x585/0xaa0 fs/bcachefs/buckets.c:869
 bch2_key_trigger fs/bcachefs/bkey_methods.h:87 [inline]
 bch2_key_trigger_old fs/bcachefs/bkey_methods.h:101 [inline]
 btree_update_nodes_written_trans fs/bcachefs/btree_update_interior.c:651 [inline]
 btree_update_nodes_written fs/bcachefs/btree_update_interior.c:723 [inline]
 btree_interior_update_work+0xe45/0x2b10 fs/bcachefs/btree_update_interior.c:861
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	89 44 24 60          	mov    %eax,0x60(%rsp)
   4:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   9:	74 08                	je     0x13
   b:	4c 89 ef             	mov    %r13,%rdi
   e:	e8 ed 3b e8 fd       	call   0xfde83c00
  13:	49 8b 45 00          	mov    0x0(%r13),%rax
  17:	48 89 44 24 48       	mov    %rax,0x48(%rsp)
  1c:	48 8d 90 98 00 00 00 	lea    0x98(%rax),%rdx
  23:	48 89 d0             	mov    %rdx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	48 89 94 24 80 00 00 	mov    %rdx,0x80(%rsp)
  38:	00
  39:	0f 85 ee 10 00 00    	jne    0x112d
  3f:	4c                   	rex.WR