[  OK  ] Started Getty on tty2.
[  OK  ] Started Getty on tty1.
[  OK  ] Started Serial Getty on ttyS0.
[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
         Starting Load/Save RF Kill Switch Status...
[  OK  ] Started Load/Save RF Kill Switch Status.

Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts.
syzkaller login: [   28.284589] gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz"
[   28.289561] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz'
[   28.305085] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz'
[   28.326797] ------------[ cut here ]------------
[   28.328301] gfs2: fsid=syz:syz: Now mounting FS...
[   28.332297] WARNING: CPU: 1 PID: 8001 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x26
[   28.332304] Kernel panic - not syncing: panic_on_warn set ...
[   28.332304] 
[   28.332312] CPU: 1 PID: 8001 Comm: syz-executor267 Not tainted 4.14.302-syzkaller #0
[   28.332319] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
[   28.354074] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz'
[   28.354305] Call Trace:
[   28.354319]  dump_stack+0x1b2/0x281
[   28.354330]  panic+0x1f9/0x42d
[   28.354336]  ? add_taint.cold+0x16/0x16
[   28.354347]  ? sysfs_warn_dup.cold+0x17/0x26
[   28.370193] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz'
[   28.372184]  ? sysfs_warn_dup.cold+0x17/0x26
[   28.372192]  __warn.cold+0x20/0x44
[   28.372201]  ? ist_end_non_atomic+0x10/0x10
[   28.372209]  ? sysfs_warn_dup.cold+0x17/0x26
[   28.419972]  report_bug+0x208/0x250
[   28.423583]  do_error_trap+0x195/0x2d0
[   28.427449]  ? math_error+0x2d0/0x2d0
[   28.431232]  ? ___preempt_schedule+0x16/0x18
[   28.435619]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   28.440441]  invalid_op+0x1b/0x40
[   28.443870] RIP: 0010:sysfs_warn_dup.cold+0x17/0x26
[   28.448861] RSP: 0018:ffff88809d367728 EFLAGS: 00010282
[   28.454206] RAX: 000000000000003a RBX: ffff8880a5981950 RCX: 0000000000000000
[   28.461541] RDX: 0000000000000000 RSI: ffffffff878bd020 RDI: ffffed1013a6cedb
[   28.468787] RBP: ffff8880b18723c0 R08: 000000000000003a R09: 0000000000000000
[   28.476032] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8882393e27e0
[   28.483280] R13: ffff8880b0092780 R14: ffff8880a5981958 R15: ffff8880a5945998
[   28.490539]  ? sysfs_warn_dup.cold+0x17/0x26
[   28.494925]  sysfs_create_dir_ns+0x16f/0x1d0
[   28.499311]  kobject_add_internal+0x28b/0x930
[   28.503784]  kobject_init_and_add+0xde/0x120
[   28.508172]  ? kobject_create_and_add+0x200/0x200
[   28.512993]  ? vsnprintf+0x260/0x1340
[   28.516775]  gfs2_sys_fs_add+0x184/0x3f0
[   28.520816]  ? recover_store+0x100/0x100
[   28.524863]  ? snprintf+0xa5/0xd0
[   28.528295]  ? strscpy+0x94/0x280
[   28.531728]  fill_super+0x118b/0x2310
[   28.535507]  ? vsnprintf+0x260/0x1340
[   28.539371]  ? gfs2_online_uevent+0x1b0/0x1b0
[   28.543885]  ? pointer+0x9e0/0x9e0
[   28.547403]  ? snprintf+0xa5/0xd0
[   28.550833]  ? vsprintf+0x30/0x30
[   28.554351]  ? gfs2_open+0x160/0x160
[   28.558040]  ? set_blocksize+0x125/0x380
[   28.562080]  gfs2_mount+0x439/0x510
[   28.565683]  ? fill_super+0x2310/0x2310
[   28.569648]  ? alloc_pages_current+0x15d/0x260
[   28.574211]  ? __lockdep_init_map+0x100/0x560
[   28.578683]  mount_fs+0x92/0x2a0
[   28.582030]  vfs_kern_mount.part.0+0x5b/0x470
[   28.586503]  do_mount+0xe65/0x2a30
[   28.590023]  ? retint_kernel+0x2d/0x2d
[   28.593889]  ? copy_mount_string+0x40/0x40
[   28.598101]  ? memset+0x20/0x40
[   28.601358]  ? copy_mount_options+0x1fa/0x2f0
[   28.605826]  ? copy_mnt_ns+0xa30/0xa30
[   28.609690]  SyS_mount+0xa8/0x120
[   28.613117]  ? copy_mnt_ns+0xa30/0xa30
[   28.616986]  do_syscall_64+0x1d5/0x640
[   28.621036]  entry_SYSCALL_64_after_hwframe+0x5e/0xd3
[   28.626204] RIP: 0033:0x7f9f201ad6ba
[   28.629895] RSP: 002b:00007ffc931277f8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
[   28.637581] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f9f201ad6ba
[   28.644827] RDX: 0000000020037f40 RSI: 0000000020037f80 RDI: 00007ffc93127810
[   28.652076] RBP: 00007ffc93127810 R08: 00007ffc93127850 R09: 0000000000000002
[   28.659936] R10: 0000000000000000 R11: 0000000000000282 R12: 0000000000000004
[   28.667198] R13: 00005555559572c0 R14: 0000000000000000 R15: 00007ffc93127850
[   28.674670] Kernel Offset: disabled
[   28.678493] Rebooting in 86400 seconds..