incfs: Backing dir is not set, filesystem can't be mounted.
general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
CPU: 0 PID: 417 Comm: syz-executor051 Not tainted 5.10.81-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:incfs_kill_sb+0x4d/0x150 fs/incfs/vfs.c:1907
Code: 48 89 fb 80 3c 02 00 0f 85 e0 00 00 00 4c 8b a3 c8 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 eb 00 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc9000024fbd0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88810ab47000 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff84c02160 RDI: 0000000000000010
RBP: ffffc9000024fbf0 R08: 0000000000000001 R09: ffff88823fe45a00
R10: 0000000000000246 R11: ffff88811dc94000 R12: 0000000000000000
R13: ffff88810ab473c8 R14: ffffc9000024fc60 R15: fffffffffffffffe
FS:  000055555689e300(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558518514338 CR3: 0000000109a66000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 deactivate_locked_super+0x8b/0x130 fs/super.c:335
 incfs_mount_fs+0x63d/0x7c0 fs/incfs/vfs.c:1868
 legacy_get_tree+0xf5/0x1d0 fs/fs_context.c:592
 vfs_get_tree+0x7f/0x2b0 fs/super.c:1549
 do_new_mount fs/namespace.c:2899 [inline]
 path_mount+0x49a/0x1df0 fs/namespace.c:3229
 do_mount fs/namespace.c:3242 [inline]
 __do_sys_mount fs/namespace.c:3450 [inline]
 __se_sys_mount fs/namespace.c:3427 [inline]
 __x64_sys_mount+0x20e/0x280 fs/namespace.c:3427
 do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f100b52dfe9
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe32008448 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f100b52dfe9
RDX: 0000000020000200 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007f100b4f1f00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f100b4f1f90
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace f4743d8c29748e9d ]---
RIP: 0010:incfs_kill_sb+0x4d/0x150 fs/incfs/vfs.c:1907
Code: 48 89 fb 80 3c 02 00 0f 85 e0 00 00 00 4c 8b a3 c8 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d 7c 24 10 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 eb 00 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b
RSP: 0018:ffffc9000024fbd0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88810ab47000 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff84c02160 RDI: 0000000000000010
RBP: ffffc9000024fbf0 R08: 0000000000000001 R09: ffff88823fe45a00
R10: 0000000000000246 R11: ffff88811dc94000 R12: 0000000000000000
R13: ffff88810ab473c8 R14: ffffc9000024fc60 R15: fffffffffffffffe
FS:  000055555689e300(0000) GS:ffff8881f7200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000558518514338 CR3: 0000000109a66000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	48 89 fb             	mov    %rdi,%rbx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 e0 00 00 00    	jne    0xed
   d:	4c 8b a3 c8 03 00 00 	mov    0x3c8(%rbx),%r12
  14:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1b:	fc ff df
  1e:	49 8d 7c 24 10       	lea    0x10(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 eb 00 00 00    	jne    0x11f
  34:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  3b:	fc ff df
  3e:	4d                   	rex.WRB
  3f:	8b                   	.byte 0x8b