gfs2: fsid=syz:syz.0: jid=0: Looking at journal...
gfs2: fsid=syz:syz.0: jid=0: Done
gfs2: fsid=syz:syz.0: first mount done, others may mount
sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz'
------------[ cut here ]------------
WARNING: CPU: 0 PID: 10355 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x26 fs/sysfs/dir.c:30
Kernel panic - not syncing: kernel: panic_on_warn set ...

CPU: 0 PID: 10355 Comm: syz-executor.3 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 panic+0x21d/0x451 kernel/panic.c:247
 check_panic_on_warn.cold+0x19/0x35 kernel/panic.c:171
 __warn+0xdf/0x1e0 kernel/panic.c:603
 report_bug+0x208/0x250 lib/bug.c:183
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x195/0x2d0 arch/x86/kernel/traps.c:295
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:967
RIP: 0010:sysfs_warn_dup.cold+0x17/0x26 fs/sysfs/dir.c:30
RSP: 0018:ffff88804ba2f728 EFLAGS: 00010282
RAX: 000000000000003a RBX: ffff88804fe15190 RCX: 0000000000000000
RDX: 000000000000c04b RSI: ffffffff814443b0 RDI: ffffed1009745edb
RBP: ffff8880b3c4c140 R08: 000000000000003a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888238c17ee0
R13: ffff88809a80d9c0 R14: ffff88804fe15198 R15: ffff88804c024f18
 sysfs_create_dir_ns+0x16f/0x1d0 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:71 [inline]
 kobject_add_internal+0x28b/0x930 lib/kobject.c:229
 kobject_add_varg lib/kobject.c:364 [inline]
 kobject_init_and_add+0xde/0x120 lib/kobject.c:436
 gfs2_sys_fs_add+0x184/0x3f0 fs/gfs2/sys.c:652
 fill_super+0x118b/0x2310 fs/gfs2/ops_fstype.c:1127
 gfs2_mount+0x439/0x510 fs/gfs2/ops_fstype.c:1340
 mount_fs+0x92/0x2a0 fs/super.c:1237
 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
 vfs_kern_mount fs/namespace.c:1036 [inline]
 do_new_mount fs/namespace.c:2572 [inline]
 do_mount+0xe65/0x2a30 fs/namespace.c:2905
 SYSC_mount fs/namespace.c:3121 [inline]
 SyS_mount+0xa8/0x120 fs/namespace.c:3098
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd018deb62a
RSP: 002b:00007fd01735bf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000134d7 RCX: 00007fd018deb62a
RDX: 0000000020000100 RSI: 0000000020013440 RDI: 00007fd01735bfe0
RBP: 00007fd01735c020 R08: 00007fd01735c020 R09: 0000000000000081
R10: 0000000000000081 R11: 0000000000000202 R12: 0000000020000100
R13: 0000000020013440 R14: 00007fd01735bfe0 R15: 0000000020002380
Kernel Offset: disabled
Rebooting in 86400 seconds..