Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 8044 Comm: syz-executor Not tainted 6.12.0-rc2-syzkaller-00205-g1d227fcc7222 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:backup_super_roots fs/btrfs/disk-io.c:1690 [inline]
RIP: 0010:write_all_supers+0x97a/0x40f0 fs/btrfs/disk-io.c:4031
Code: 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 8a 34 00 00 44 88 33 48 8b 5c 24 10 48 83 c3 18 49 89 df 49 c1 ef 03 <43> 80 3c 2f 00 74 08 48 89 df e8 e7 52 49 fe 48 89 5c 24 10 48 8b
RSP: 0018:ffffc900094575e0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000018 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802e9cb3e0
RBP: ffffc90009457990 R08: ffff88806b65406b R09: 1ffff1100d6ca80d
R10: dffffc0000000000 R11: ffffed100d6ca80e R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  000055556e2e1500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3f847052d8 CR3: 000000007be9c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_commit_transaction+0x1eae/0x3740 fs/btrfs/transaction.c:2529
 sync_filesystem+0x1c8/0x230 fs/sync.c:66
 generic_shutdown_super+0x72/0x2d0 fs/super.c:621
 kill_anon_super+0x3b/0x70 fs/super.c:1237
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd79db7f327
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffcce2ccc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000064 RCX: 00007fd79db7f327
RDX: 0000000000000200 RSI: 0000000000000009 RDI: 00007fffcce2de70
RBP: 00007fd79dbf0134 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000202 R12: 00007fffcce2de70
R13: 00007fd79dbf0134 R14: 000055556e2e14a8 R15: 00007fffcce2ef30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:backup_super_roots fs/btrfs/disk-io.c:1690 [inline]
RIP: 0010:write_all_supers+0x97a/0x40f0 fs/btrfs/disk-io.c:4031
Code: 00 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 0f 85 8a 34 00 00 44 88 33 48 8b 5c 24 10 48 83 c3 18 49 89 df 49 c1 ef 03 <43> 80 3c 2f 00 74 08 48 89 df e8 e7 52 49 fe 48 89 5c 24 10 48 8b
RSP: 0018:ffffc900094575e0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000018 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88802e9cb3e0
RBP: ffffc90009457990 R08: ffff88806b65406b R09: 1ffff1100d6ca80d
R10: dffffc0000000000 R11: ffffed100d6ca80e R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000003
FS:  000055556e2e1500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b2506f3668 CR3: 000000007be9c000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 48 89             	add    %cl,-0x77(%rax)
   5:	d8 48 c1             	fmuls  -0x3f(%rax)
   8:	e8 03 42 0f b6       	call   0xb60f4210
   d:	04 28                	add    $0x28,%al
   f:	84 c0                	test   %al,%al
  11:	0f 85 8a 34 00 00    	jne    0x34a1
  17:	44 88 33             	mov    %r14b,(%rbx)
  1a:	48 8b 5c 24 10       	mov    0x10(%rsp),%rbx
  1f:	48 83 c3 18          	add    $0x18,%rbx
  23:	49 89 df             	mov    %rbx,%r15
  26:	49 c1 ef 03          	shr    $0x3,%r15
* 2a:	43 80 3c 2f 00       	cmpb   $0x0,(%r15,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 e7 52 49 fe       	call   0xfe495320
  39:	48 89 5c 24 10       	mov    %rbx,0x10(%rsp)
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b