RBP: 0000000000000000 R08: 0000000020000300 R09: 0000000020000040
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000013
R13: 0000000000000665 R14: 00000000006fba18 R15: 0000000000000000
------------[ cut here ]------------
kobject_add_internal failed for _ with -EEXIST, don't try to register things with the same name in the same directory.
WARNING: CPU: 1 PID: 16488 at lib/kobject.c:238 kobject_add_internal+0x8d4/0xbc0 lib/kobject.c:235
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 16488 Comm: syz-executor1 Not tainted 4.16.0-rc7+ #8
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x1f4/0x2b0 lib/bug.c:186
 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986
RIP: 0010:kobject_add_internal+0x8d4/0xbc0 lib/kobject.c:235
RSP: 0018:ffff8801c5ec74a0 EFLAGS: 00010282
RAX: dffffc0000000008 RBX: ffff8801834ec0d0 RCX: ffffffff815b193e
RDX: 0000000000040000 RSI: ffffc900036a4000 RDI: 1ffff10038bd8e19
RBP: ffff8801c5ec7598 R08: 1ffff10038bd8ddb R09: 0000000000000000
R10: ffff8801c5ec7260 R11: 0000000000000000 R12: 1ffff10038bd8e9a
R13: 00000000ffffffef R14: ffff8801d3998648 R15: 1ffff10038bd8e9e
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_init_and_add+0xf9/0x150 lib/kobject.c:436
 gfs2_sys_fs_add+0x1ff/0x580 fs/gfs2/sys.c:652
 fill_super+0x86f/0x1d70 fs/gfs2/ops_fstype.c:1118
 gfs2_mount+0x587/0x6e0 fs/gfs2/ops_fstype.c:1321
 mount_fs+0x66/0x2d0 fs/super.c:1222
 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:2509 [inline]
 do_new_mount fs/namespace.c:2512 [inline]
 do_mount+0xea4/0x2bb0 fs/namespace.c:2842
 SYSC_mount fs/namespace.c:3058 [inline]
 SyS_mount+0xab/0x120 fs/namespace.c:3035
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x4578aa
RSP: 002b:00007f5516eb0bb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 00000000004578aa
RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007f5516eb0c00
RBP: 0000000000000000 R08: 0000000020000300 R09: 0000000020000040
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000013
R13: 0000000000000665 R14: 00000000006fba18 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..