EXT4-fs (loop0): 1 orphan inode deleted
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 ro without journal. Quota mode: writeback.
/dev/loop0: Can't open blockdev
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 UID: 0 PID: 5983 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:fuse_mount_destroy fs/fuse/inode.c:2118 [inline]
RIP: 0010:fuse_kill_sb_blk+0x210/0x270 fs/fuse/inode.c:2145
Code: fe 4c 89 ff e8 d1 b5 ff ff 48 89 ef e8 79 5d 00 ff 43 80 3c 2e 00 74 08 48 89 df e8 0a da ed fe 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 f1 d9 ed fe 48 8b 3b e8 f9 6a ff
RSP: 0018:ffffc90003c17af8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888118069d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffff8881168e0000 R08: ffff8881168e0077 R09: 1ffff11022d1c00e
R10: dffffc0000000000 R11: ffffed1022d1c00f R12: ffff8881168e0068
R13: dffffc0000000000 R14: 1ffff11022d1c0c7 R15: 0000000000000000
FS:  0000555591c2f500(0000) GS:ffff88818e342000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 00000001115be000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 get_tree_bdev_flags+0x4b4/0x560 fs/super.c:1698
 fuse_get_tree+0x23c/0x4f0 fs/fuse/inode.c:2003
 vfs_get_tree+0x92/0x2a0 fs/super.c:1756
 fc_mount fs/namespace.c:1199 [inline]
 do_new_mount_fc fs/namespace.c:3636 [inline]
 do_new_mount+0x329/0xa50 fs/namespace.c:3712
 do_mount fs/namespace.c:4035 [inline]
 __do_sys_mount fs/namespace.c:4224 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4201
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf0/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f29dd79acb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffc5c2bf88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f29dda15fa0 RCX: 00007f29dd79acb9
RDX: 0000200000000080 RSI: 0000200000000040 RDI: 0000200000000000
RBP: 00007f29dd808bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000003000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f29dda15fac R14: 00007f29dda15fa0 R15: 00007f29dda15fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fuse_mount_destroy fs/fuse/inode.c:2118 [inline]
RIP: 0010:fuse_kill_sb_blk+0x210/0x270 fs/fuse/inode.c:2145
Code: fe 4c 89 ff e8 d1 b5 ff ff 48 89 ef e8 79 5d 00 ff 43 80 3c 2e 00 74 08 48 89 df e8 0a da ed fe 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 f1 d9 ed fe 48 8b 3b e8 f9 6a ff
RSP: 0018:ffffc90003c17af8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888118069d40
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 00000000ffffffff
RBP: ffff8881168e0000 R08: ffff8881168e0077 R09: 1ffff11022d1c00e
R10: dffffc0000000000 R11: ffffed1022d1c00f R12: ffff8881168e0068
R13: dffffc0000000000 R14: 1ffff11022d1c0c7 R15: 0000000000000000
FS:  0000555591c2f500(0000) GS:ffff88818e342000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 00000001115be000 CR4: 00000000000006f0
----------------
Code disassembly (best guess):
   0:	fe 4c 89 ff          	decb   -0x1(%rcx,%rcx,4)
   4:	e8 d1 b5 ff ff       	call   0xffffb5da
   9:	48 89 ef             	mov    %rbp,%rdi
   c:	e8 79 5d 00 ff       	call   0xff005d8a
  11:	43 80 3c 2e 00       	cmpb   $0x0,(%r14,%r13,1)
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 0a da ed fe       	call   0xfeedda2a
  20:	48 8b 1b             	mov    (%rbx),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 f1 d9 ed fe       	call   0xfeedda2a
  39:	48 8b 3b             	mov    (%rbx),%rdi
  3c:	e8                   	.byte 0xe8
  3d:	f9                   	stc
  3e:	6a ff                	push   $0xffffffffffffffff