sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz'
------------[ cut here ]------------
ubi0: attached mtd0 (name "mtdram test device", size 0 MiB)
WARNING: CPU: 1 PID: 10010 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: 1 PID: 10010 Comm: syz-executor.5 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
ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes
 check_panic_on_warn.cold+0x19/0x35 kernel/panic.c:171
 __warn+0xdf/0x1e0 kernel/panic.c:603
ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1
 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
ubi0: VID header offset: 64 (aligned 64), data offset: 128
ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0
 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:ffff88805acf7728 EFLAGS: 00010282
RAX: 000000000000003a RBX: ffff88805a834190 RCX: 0000000000000000
RDX: 000000000000c790 RSI: ffffffff814443b0 RDI: ffffed100b59eedb
RBP: ffff88805af5c240 R08: 000000000000003a R09: 0000000000000000
ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8882393e0b60
R13: ffff8880aa8de700 R14: ffff88805a834198 R15: ffff88805ade0118
ubi0: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 3238848054
 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
ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0
 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
ubi0: background thread "ubi_bgt0d" started, PID 10043
 fill_super+0x118b/0x2310 fs/gfs2/ops_fstype.c:1127
ubi0: detaching mtd0
ubi0: mtd0 is detached
ubi0: attaching mtd0
 gfs2_mount+0x439/0x510 fs/gfs2/ops_fstype.c:1340
ubi0: scanning is finished
 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: 0033:0x7fa84a6d662a
RSP: 002b:00007fa848c46f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000012544 RCX: 00007fa84a6d662a
RDX: 0000000020000100 RSI: 0000000020012500 RDI: 00007fa848c46fe0
RBP: 00007fa848c47020 R08: 00007fa848c47020 R09: 0000000000000819
R10: 0000000000000819 R11: 0000000000000202 R12: 0000000020000100
R13: 0000000020012500 R14: 00007fa848c46fe0 R15: 0000000020000140
Kernel Offset: disabled
Rebooting in 86400 seconds..