[ OK ] Started OpenBSD Secure Shell server. [ 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. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.91' (ECDSA) to the list of known hosts. syzkaller login: [ 57.636864] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 57.637563] gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" [ 57.666947] ------------[ cut here ]------------ [ 57.671742] WARNING: CPU: 0 PID: 7968 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x26 [ 57.672690] gfs2: fsid=syz:syz: Now mounting FS... [ 57.679958] Kernel panic - not syncing: panic_on_warn set ... [ 57.679958] [ 57.679967] CPU: 0 PID: 7968 Comm: syz-executor169 Not tainted 4.14.302-syzkaller #0 [ 57.679971] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 [ 57.679973] Call Trace: [ 57.679989] dump_stack+0x1b2/0x281 [ 57.679999] panic+0x1f9/0x42d [ 57.680006] ? add_taint.cold+0x16/0x16 [ 57.680016] ? sysfs_warn_dup.cold+0x17/0x26 [ 57.680029] ? sysfs_warn_dup.cold+0x17/0x26 [ 57.690326] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 57.692298] __warn.cold+0x20/0x44 [ 57.692309] ? ist_end_non_atomic+0x10/0x10 [ 57.692316] ? sysfs_warn_dup.cold+0x17/0x26 [ 57.692325] report_bug+0x208/0x250 [ 57.754157] do_error_trap+0x195/0x2d0 [ 57.758024] ? math_error+0x2d0/0x2d0 [ 57.761892] ? ___preempt_schedule+0x16/0x18 [ 57.766280] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 57.771104] invalid_op+0x1b/0x40 [ 57.774536] RIP: 0010:sysfs_warn_dup.cold+0x17/0x26 [ 57.779543] RSP: 0018:ffff8880b3e2f728 EFLAGS: 00010282 [ 57.784883] RAX: 000000000000003a RBX: ffff8880955bdc10 RCX: 0000000000000000 [ 57.792131] RDX: 0000000000000000 RSI: ffffffff878bd020 RDI: ffffed10167c5edb [ 57.799378] RBP: ffff88809561adc0 R08: 000000000000003a R09: 0000000000000000 [ 57.806623] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b085bd20 [ 57.813870] R13: ffff8880b0037cc0 R14: ffff8880955bdc18 R15: ffff8880b28a5bd8 [ 57.821128] ? sysfs_warn_dup.cold+0x17/0x26 [ 57.825518] sysfs_create_dir_ns+0x16f/0x1d0 [ 57.829905] kobject_add_internal+0x28b/0x930 [ 57.834380] kobject_init_and_add+0xde/0x120 [ 57.838765] ? kobject_create_and_add+0x200/0x200 [ 57.843585] ? vsnprintf+0x260/0x1340 [ 57.847396] gfs2_sys_fs_add+0x184/0x3f0 [ 57.851434] ? recover_store+0x100/0x100 [ 57.855475] ? snprintf+0xa5/0xd0 [ 57.858907] ? strscpy+0x94/0x280 [ 57.862341] fill_super+0x118b/0x2310 [ 57.866122] ? vsnprintf+0x260/0x1340 [ 57.869900] ? gfs2_online_uevent+0x1b0/0x1b0 [ 57.874374] ? pointer+0x9e0/0x9e0 [ 57.877905] ? snprintf+0xa5/0xd0 [ 57.881348] ? vsprintf+0x30/0x30 [ 57.884779] ? gfs2_open+0x160/0x160 [ 57.888471] ? set_blocksize+0x125/0x380 [ 57.892524] gfs2_mount+0x439/0x510 [ 57.896129] ? fill_super+0x2310/0x2310 [ 57.900207] ? alloc_pages_current+0x15d/0x260 [ 57.904790] ? __lockdep_init_map+0x100/0x560 [ 57.909263] mount_fs+0x92/0x2a0 [ 57.912610] vfs_kern_mount.part.0+0x5b/0x470 [ 57.917088] do_mount+0xe65/0x2a30 [ 57.920619] ? copy_mount_string+0x40/0x40 [ 57.924834] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 57.929829] ? copy_mnt_ns+0xa30/0xa30 [ 57.933694] ? copy_mount_options+0x1fa/0x2f0 [ 57.938166] ? copy_mnt_ns+0xa30/0xa30 [ 57.942033] SyS_mount+0xa8/0x120 [ 57.945483] ? copy_mnt_ns+0xa30/0xa30 [ 57.949350] do_syscall_64+0x1d5/0x640 [ 57.953219] entry_SYSCALL_64_after_hwframe+0x5e/0xd3 [ 57.958387] RIP: 0033:0x7f9d1297b6ea [ 57.962077] RSP: 002b:00007ffe3c563c18 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 [ 57.969765] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f9d1297b6ea [ 57.977029] RDX: 0000000020037f40 RSI: 0000000020037f80 RDI: 00007ffe3c563c30 [ 57.984284] RBP: 00007ffe3c563c30 R08: 00007ffe3c563c70 R09: 0000000000000002 [ 57.991531] R10: 0000000002008010 R11: 0000000000000282 R12: 0000000000000004 [ 57.998777] R13: 0000555556d482c0 R14: 0000000002008010 R15: 00007ffe3c563c70 [ 58.006363] Kernel Offset: disabled [ 58.010012] Rebooting in 86400 seconds..