Oops: general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 1 PID: 20653 Comm: syz-executor.4 Not tainted 6.9.0-syzkaller-10323-g8f6a15f095a6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:bch2_snapshot_has_children fs/bcachefs/snapshot.h:184 [inline]
RIP: 0010:__bch2_insert_snapshot_whiteouts+0x3ad/0x1140 fs/bcachefs/btree_update.c:135
Code: 00 e8 07 7e 98 fd 48 6b db 38 4d 8d 64 1c 18 e8 f9 7d 98 fd 49 8d 7c 24 14 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7c
RSP: 0018:ffffc9000ddd6568 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90011dfc000
RDX: 0000000000000002 RSI: ffffffff83f6b7a7 RDI: 0000000000000014
RBP: ffffc9000ddd6880 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000009 R12: 0000000000000000
R13: 1ffff92001bbacbe R14: ffffc9000ddd6bf0 R15: ffffc9000ddd6f48
FS:  00007f904123f6c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff05c172000 CR3: 000000005b4ce000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 bch2_insert_snapshot_whiteouts fs/bcachefs/btree_update.h:95 [inline]
 bch2_trans_update_extent_overwrite+0x1219/0x1890 fs/bcachefs/btree_update.c:218
 bch2_trans_update_extent.isra.0+0x621/0x10d0 fs/bcachefs/btree_update.c:318
 bch2_trans_update+0x395/0x5c0 fs/bcachefs/btree_update.c:514
 bch2_extent_update+0x405/0xa40 fs/bcachefs/io_write.c:325
 bch2_write_index_default+0x8da/0xb70 fs/bcachefs/io_write.c:374
 __bch2_write_index+0x5ee/0xa60 fs/bcachefs/io_write.c:527
 __bch2_write+0x2703/0x4c70 fs/bcachefs/io_write.c:1498
 bch2_write+0x734/0x14d0 fs/bcachefs/io_write.c:1623
 closure_queue include/linux/closure.h:269 [inline]
 closure_call include/linux/closure.h:402 [inline]
 bch2_dio_write_loop fs/bcachefs/fs-io-direct.c:531 [inline]
 bch2_direct_write+0x1dff/0x4310 fs/bcachefs/fs-io-direct.c:652
 bch2_write_iter+0x10c/0x31a0 fs/bcachefs/fs-io-buffered.c:1135
 call_write_iter include/linux/fs.h:2114 [inline]
 iter_file_splice_write+0x909/0x10b0 fs/splice.c:743
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x19e/0x6d0 fs/splice.c:1164
 splice_direct_to_actor+0x349/0xa40 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x17e/0x250 fs/splice.c:1233
 do_sendfile+0xb1e/0xe50 fs/read_write.c:1295
 __do_sys_sendfile64 fs/read_write.c:1362 [inline]
 __se_sys_sendfile64 fs/read_write.c:1348 [inline]
 __x64_sys_sendfile64+0x1da/0x220 fs/read_write.c:1348
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f904047cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f904123f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f90405abf80 RCX: 00007f904047cee9
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000009
RBP: 00007f90404c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f90405abf80 R15: 00007ffcf48cec58
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_snapshot_has_children fs/bcachefs/snapshot.h:184 [inline]
RIP: 0010:__bch2_insert_snapshot_whiteouts+0x3ad/0x1140 fs/bcachefs/btree_update.c:135
Code: 00 e8 07 7e 98 fd 48 6b db 38 4d 8d 64 1c 18 e8 f9 7d 98 fd 49 8d 7c 24 14 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7c
RSP: 0018:ffffc9000ddd6568 EFLAGS: 00010213
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90011dfc000
RDX: 0000000000000002 RSI: ffffffff83f6b7a7 RDI: 0000000000000014
RBP: ffffc9000ddd6880 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000009 R12: 0000000000000000
R13: 1ffff92001bbacbe R14: ffffc9000ddd6bf0 R15: ffffc9000ddd6f48
FS:  00007f904123f6c0(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f024393e000 CR3: 000000005b4ce000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e8 07 7e 98 fd       	call   0xfd987e0c
   5:	48 6b db 38          	imul   $0x38,%rbx,%rbx
   9:	4d 8d 64 1c 18       	lea    0x18(%r12,%rbx,1),%r12
   e:	e8 f9 7d 98 fd       	call   0xfd987e0c
  13:	49 8d 7c 24 14       	lea    0x14(%r12),%rdi
  18:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1f:	fc ff df
  22:	48 89 fa             	mov    %rdi,%rdx
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2d:	48 89 f8             	mov    %rdi,%rax
  30:	83 e0 07             	and    $0x7,%eax
  33:	83 c0 03             	add    $0x3,%eax
  36:	38 d0                	cmp    %dl,%al
  38:	7c 08                	jl     0x42
  3a:	84 d2                	test   %dl,%dl
  3c:	0f                   	.byte 0xf
  3d:	85                   	.byte 0x85
  3e:	7c                   	.byte 0x7c