[ 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... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.168' (ECDSA) to the list of known hosts. syzkaller login: [ 29.350875] gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" [ 29.359664] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.363899] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.370497] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.380795] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.381419] ------------[ cut here ]------------ [ 29.388285] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.392668] WARNING: CPU: 1 PID: 8000 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d [ 29.392674] Kernel panic - not syncing: panic_on_warn set ... [ 29.392674] [ 29.392683] CPU: 1 PID: 8000 Comm: syz-executor107 Not tainted 4.14.203-syzkaller #0 [ 29.392690] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.405081] ------------[ cut here ]------------ [ 29.407577] Call Trace: [ 29.414935] WARNING: CPU: 0 PID: 7998 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d [ 29.422810] dump_stack+0x1b2/0x283 [ 29.432134] Modules linked in: [ 29.436882] panic+0x1f9/0x42d [ 29.448387] ? add_taint.cold+0x16/0x16 [ 29.451994] CPU: 0 PID: 7998 Comm: syz-executor107 Not tainted 4.14.203-syzkaller #0 [ 29.455170] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.458349] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.458355] task: ffff8880b2a58040 task.stack: ffff8880b3008000 [ 29.462313] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.470174] RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d [ 29.474581] __warn.cold+0x20/0x4b [ 29.483910] RSP: 0018:ffff8880b300f728 EFLAGS: 00010282 [ 29.489960] ? ist_end_non_atomic+0x10/0x10 [ 29.494340] RAX: 000000000000003a RBX: ffff888095b50a10 RCX: 0000000000000000 [ 29.494346] RDX: 0000000000000000 RSI: ffffffff878bb940 RDI: ffffed1016601edb [ 29.499366] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.502896] RBP: ffff8880b2a7e000 R08: 000000000000003a R09: 0000000000000000 [ 29.502902] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b11c3b60 [ 29.508245] report_bug+0x208/0x249 [ 29.512542] R13: ffff8880af5cf0c0 R14: ffff888095b50a18 R15: ffff888095490998 [ 29.519816] do_error_trap+0x195/0x2d0 [ 29.527063] FS: 0000000001b7c880(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 29.531459] ? math_error+0x2d0/0x2d0 [ 29.538704] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.538710] CR2: 00007ffc4de6dbe8 CR3: 000000009b1a0000 CR4: 00000000001406f0 [ 29.546056] ? ___preempt_schedule+0x16/0x18 [ 29.549667] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.557009] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.560865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.569095] invalid_op+0x1b/0x40 [ 29.572885] Call Trace: [ 29.578754] RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d [ 29.586024] sysfs_create_dir_ns+0x16f/0x1d0 [ 29.590428] RSP: 0018:ffff888095417728 EFLAGS: 00010282 [ 29.597687] kobject_add_internal+0x28b/0x930 [ 29.602551] RAX: 000000000000003a RBX: ffff888095490990 RCX: 0000000000000000 [ 29.609813] kobject_init_and_add+0xde/0x120 [ 29.613256] RDX: 0000000000000000 RSI: ffffffff87cccc60 RDI: ffffed1012a82edb [ 29.615822] ? kobject_create_and_add+0x200/0x200 [ 29.620813] RBP: ffff8880b301e0c0 R08: 000000000000003a R09: 0000000000000000 [ 29.627830] ? vsnprintf+0x260/0x1340 [ 29.633181] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b11c3b60 [ 29.637680] gfs2_sys_fs_add+0x184/0x3f0 [ 29.644936] R13: ffff8880afb26780 R14: ffff888095490998 R15: ffff8880955189d8 [ 29.649326] ? recover_store+0x100/0x100 [ 29.656614] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.661425] ? snprintf+0xa5/0xd0 [ 29.668676] sysfs_create_dir_ns+0x16f/0x1d0 [ 29.672465] ? memcpy+0x35/0x50 [ 29.679711] kobject_add_internal+0x28b/0x930 [ 29.683750] fill_super+0x118b/0x2310 [ 29.691002] kobject_init_and_add+0xde/0x120 [ 29.695067] ? vsnprintf+0x260/0x1340 [ 29.699453] ? kobject_create_and_add+0x200/0x200 [ 29.702884] ? gfs2_online_uevent+0x1b0/0x1b0 [ 29.707268] ? vsnprintf+0x260/0x1340 [ 29.710524] ? pointer+0x9e0/0x9e0 [ 29.715016] gfs2_sys_fs_add+0x184/0x3f0 [ 29.718797] ? snprintf+0xa5/0xd0 [ 29.723181] ? recover_store+0x100/0x100 [ 29.726959] ? vsprintf+0x30/0x30 [ 29.731800] ? snprintf+0xa5/0xd0 [ 29.736282] ? gfs2_open+0x160/0x160 [ 29.740080] ? memcpy+0x35/0x50 [ 29.743682] ? set_blocksize+0x125/0x380 [ 29.747719] fill_super+0x118b/0x2310 [ 29.751156] gfs2_mount+0x439/0x502 [ 29.755193] ? vsnprintf+0x260/0x1340 [ 29.758622] ? fill_super+0x2310/0x2310 [ 29.762054] ? gfs2_online_uevent+0x1b0/0x1b0 [ 29.765765] ? alloc_pages_current+0x15d/0x260 [ 29.769009] ? pointer+0x9e0/0x9e0 [ 29.773044] ? __lockdep_init_map+0x100/0x560 [ 29.776908] ? snprintf+0xa5/0xd0 [ 29.780598] mount_fs+0x92/0x2a0 [ 29.784373] ? vsprintf+0x30/0x30 [ 29.788347] vfs_kern_mount.part.0+0x5b/0x470 [ 29.792824] ? gfs2_open+0x160/0x160 [ 29.797401] do_mount+0xe53/0x2a00 [ 29.800915] ? set_blocksize+0x125/0x380 [ 29.805404] ? do_raw_spin_unlock+0x164/0x220 [ 29.808837] gfs2_mount+0x439/0x502 [ 29.812205] ? copy_mount_string+0x40/0x40 [ 29.815632] ? fill_super+0x2310/0x2310 [ 29.820105] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 29.823793] ? _find_next_bit+0xdb/0x100 [ 29.823815] ? alloc_pages_current+0x15d/0x260 [ 29.827324] ? copy_mnt_ns+0xa30/0xa30 [ 29.831375] ? __lockdep_init_map+0x100/0x560 [ 29.835854] ? copy_mount_options+0x1fa/0x2f0 [ 29.839455] mount_fs+0x92/0x2a0 [ 29.843686] ? copy_mnt_ns+0xa30/0xa30 [ 29.847643] vfs_kern_mount.part.0+0x5b/0x470 [ 29.852634] SyS_mount+0xa8/0x120 [ 29.856674] do_mount+0xe53/0x2a00 [ 29.861245] ? copy_mnt_ns+0xa30/0xa30 [ 29.865138] ? copy_mount_string+0x40/0x40 [ 29.869692] do_syscall_64+0x1d5/0x640 [ 29.874179] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 29.877564] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.881429] ? copy_mnt_ns+0xa30/0xa30 [ 29.885916] RIP: 0033:0x45c57a [ 29.889414] ? copy_mount_options+0x1fa/0x2f0 [ 29.892930] RSP: 002b:00007ffef6d2e0c8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 [ 29.896805] ? copy_mnt_ns+0xa30/0xa30 [ 29.901012] RAX: ffffffffffffffda RBX: 00007ffef6d2e120 RCX: 000000000045c57a [ 29.904879] SyS_mount+0xa8/0x120 [ 29.909868] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffef6d2e0e0 [ 29.915040] ? copy_mnt_ns+0xa30/0xa30 [ 29.918907] RBP: 00007ffef6d2e0e0 R08: 00007ffef6d2e120 R09: 0000000000000000 [ 29.922689] do_syscall_64+0x1d5/0x640 [ 29.927171] R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000091c [ 29.934971] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.938911] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 29.946188] RIP: 0033:0x45c57a [ 29.949630] Code: [ 29.956872] RSP: 002b:00007ffef6d2e0c8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 [ 29.960762] 19 [ 29.968017] RAX: ffffffffffffffda RBX: 00007ffef6d2e120 RCX: 000000000045c57a [ 29.971879] f2 [ 29.979131] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffef6d2e0e0 [ 29.979137] RBP: 00007ffef6d2e0e0 R08: 00007ffef6d2e120 R09: 0000000000000000 [ 29.984321] 8b [ 29.991599] R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000091c [ 29.994766] e8 [ 29.996919] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 30.004609] 99 06 db ff eb d8 e8 92 06 db ff e9 6d ff ff ff e8 c8 34 b1 ff 4c 89 ea 48 89 ee 48 c7 c7 20 a0 95 87 e8 57 c1 9f ff <0f> 0b 48 89 ef 5d 41 5c 41 5d e9 a7 db da ff 90 90 90 90 90 90 [ 30.066972] ---[ end trace 26cb5ae9515b6bb3 ]--- [ 30.072357] Kernel Offset: disabled [ 30.076054] Rebooting in 86400 seconds..