general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 5087 Comm: kworker/u9:3 Not tainted 6.9.0-rc7-syzkaller-00188-gba16c1cf11c9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: bcachefs bch2_write_point_do_index_updates
RIP: 0010:bch2_snapshot_has_children fs/bcachefs/snapshot.h:188 [inline]
RIP: 0010:__bch2_insert_snapshot_whiteouts+0x306/0x15e0 fs/bcachefs/btree_update.c:135
Code: fb 0f 86 c2 11 00 00 e8 08 5c 82 fd 49 6b c7 38 49 8d 5c 04 18 48 8d 7b 14 48 89 f8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df <42> 0f b6 04 20 84 c0 0f 85 3d 12 00 00 44 8b 7b 14 48 83 c3 18 48
RSP: 0018:ffffc900037b6920 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffff888025138000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000014
RBP: ffffc900037b6c80 R08: ffffffff8413ab28 R09: 1ffffffff25dfca0
R10: dffffc0000000000 R11: fffffbfff25dfca1 R12: dffffc0000000000
R13: ffffc900037b6be0 R14: ffffffff8413aa44 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c001a49eb8 CR3: 00000000465ec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_insert_snapshot_whiteouts fs/bcachefs/btree_update.h:93 [inline]
 bch2_trans_update_extent_overwrite+0xfd6/0x3710 fs/bcachefs/btree_update.c:218
 bch2_trans_update_extent fs/bcachefs/btree_update.c:318 [inline]
 bch2_trans_update+0x186f/0x2550 fs/bcachefs/btree_update.c:514
 bch2_extent_update+0x43c/0xbb0 fs/bcachefs/io_write.c:325
 bch2_write_index_default fs/bcachefs/io_write.c:374 [inline]
 __bch2_write_index+0xee9/0x2190 fs/bcachefs/io_write.c:528
 bch2_write_point_do_index_updates+0x32e/0x690 fs/bcachefs/io_write.c:637
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3348
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3429
 kthread+0x2f0/0x390 kernel/kthread.c:388
 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 ]---
RIP: 0010:bch2_snapshot_has_children fs/bcachefs/snapshot.h:188 [inline]
RIP: 0010:__bch2_insert_snapshot_whiteouts+0x306/0x15e0 fs/bcachefs/btree_update.c:135
Code: fb 0f 86 c2 11 00 00 e8 08 5c 82 fd 49 6b c7 38 49 8d 5c 04 18 48 8d 7b 14 48 89 f8 48 c1 e8 03 49 bc 00 00 00 00 00 fc ff df <42> 0f b6 04 20 84 c0 0f 85 3d 12 00 00 44 8b 7b 14 48 83 c3 18 48
RSP: 0018:ffffc900037b6920 EFLAGS: 00010203
RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffff888025138000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000014
RBP: ffffc900037b6c80 R08: ffffffff8413ab28 R09: 1ffffffff25dfca0
R10: dffffc0000000000 R11: fffffbfff25dfca1 R12: dffffc0000000000
R13: ffffc900037b6be0 R14: ffffffff8413aa44 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c001a49eb8 CR3: 00000000465ec000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fb                   	sti
   1:	0f 86 c2 11 00 00    	jbe    0x11c9
   7:	e8 08 5c 82 fd       	call   0xfd825c14
   c:	49 6b c7 38          	imul   $0x38,%r15,%rax
  10:	49 8d 5c 04 18       	lea    0x18(%r12,%rax,1),%rbx
  15:	48 8d 7b 14          	lea    0x14(%rbx),%rdi
  19:	48 89 f8             	mov    %rdi,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	49 bc 00 00 00 00 00 	movabs $0xdffffc0000000000,%r12
  27:	fc ff df
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 3d 12 00 00    	jne    0x1274
  37:	44 8b 7b 14          	mov    0x14(%rbx),%r15d
  3b:	48 83 c3 18          	add    $0x18,%rbx
  3f:	48                   	rex.W