incfs: Backing dir is not set, filesystem can't be mounted. kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 26026 Comm: syz-executor.2 Not tainted 5.4.161-syzkaller-00001-g2d28921044b9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:incfs_kill_sb+0x47/0xe0 fs/incfs/vfs.c:1882 Code: 9e f0 03 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 68 32 b2 ff 4c 8b 23 49 8d 5c 24 10 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 4a 32 b2 ff 48 8b 1b 48 83 c3 30 RSP: 0018:ffff8881c8f87d38 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000010 RCX: 0000000000040000 RDX: ffffc90001b51000 RSI: 000000000000d5f5 RDI: 000000000000d5f6 RBP: 0000000000000000 R08: ffffffff821f6354 R09: ffffed10391f0f2c R10: ffffed10391f0f2c R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8881b9999000 R15: dffffc0000000000 FS: 00007f2b43c39700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe77e160028 CR3: 00000001e4c9d000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: deactivate_locked_super+0xaf/0x100 fs/super.c:335 incfs_mount_fs+0x70c/0x7d0 fs/incfs/vfs.c:1846 legacy_get_tree+0xde/0x170 fs/fs_context.c:647 vfs_get_tree+0x83/0x260 fs/super.c:1547 vfs_fsconfig_locked fs/fsopen.c:232 [inline] __do_sys_fsconfig fs/fsopen.c:445 [inline] __se_sys_fsconfig+0xc2e/0xf40 fs/fsopen.c:314 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f2b44ac3049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2b43c39168 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007f2b44bd5f60 RCX: 00007f2b44ac3049 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00007f2b44b1d08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc16b0973f R14: 00007f2b43c39300 R15: 0000000000022000 Modules linked in: ---[ end trace 18004573cdebd5a0 ]--- RIP: 0010:incfs_kill_sb+0x47/0xe0 fs/incfs/vfs.c:1882 Code: 9e f0 03 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 68 32 b2 ff 4c 8b 23 49 8d 5c 24 10 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 4a 32 b2 ff 48 8b 1b 48 83 c3 30 RSP: 0018:ffff8881c8f87d38 EFLAGS: 00010202 RAX: 0000000000000002 RBX: 0000000000000010 RCX: 0000000000040000 RDX: ffffc90001b51000 RSI: 000000000000d5f5 RDI: 000000000000d5f6 RBP: 0000000000000000 R08: ffffffff821f6354 R09: ffffed10391f0f2c R10: ffffed10391f0f2c R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff8881b9999000 R15: dffffc0000000000 FS: 00007f2b43c39700(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555556fdab38 CR3: 00000001e4c9d000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 9e sahf 1: f0 03 00 lock add (%rax),%eax 4: 00 48 89 add %cl,-0x77(%rax) 7: d8 48 c1 fmuls -0x3f(%rax) a: e8 03 42 80 3c callq 0x3c804212 f: 28 00 sub %al,(%rax) 11: 74 08 je 0x1b 13: 48 89 df mov %rbx,%rdi 16: e8 68 32 b2 ff callq 0xffb23283 1b: 4c 8b 23 mov (%rbx),%r12 1e: 49 8d 5c 24 10 lea 0x10(%r12),%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 4a 32 b2 ff callq 0xffb23283 39: 48 8b 1b mov (%rbx),%rbx 3c: 48 83 c3 30 add $0x30,%rbx