[ 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 '10.128.0.19' (ECDSA) to the list of known hosts. syzkaller login: [ 29.631164] gfs2: fsid=syz:syz: Trying to join cluster "lock_nolock", "syz:syz" [ 29.641489] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.641839] sysfs: cannot create duplicate filename '/fs/gfs2/syz:syz' [ 29.652540] ------------[ cut here ]------------ [ 29.659699] WARNING: CPU: 0 PID: 8008 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d [ 29.667932] Kernel panic - not syncing: panic_on_warn set ... [ 29.667932] [ 29.674007] ------------[ cut here ]------------ [ 29.675308] CPU: 0 PID: 8008 Comm: syz-executor533 Not tainted 4.14.206-syzkaller #0 [ 29.680077] WARNING: CPU: 1 PID: 8007 at fs/sysfs/dir.c:30 sysfs_warn_dup.cold+0x17/0x2d [ 29.687929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.687935] Call Trace: [ 29.696243] Modules linked in: [ 29.705591] dump_stack+0x1b2/0x283 [ 29.711337] panic+0x1f9/0x42d [ 29.715282] CPU: 1 PID: 8007 Comm: syz-executor533 Not tainted 4.14.206-syzkaller #0 [ 29.718456] ? add_taint.cold+0x16/0x16 [ 29.726402] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.730357] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.739684] task: ffff88809719a140 task.stack: ffff8880b31b8000 [ 29.744071] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.750102] RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d [ 29.750108] RSP: 0018:ffff8880b31bf728 EFLAGS: 00010282 [ 29.754497] __warn.cold+0x20/0x4b [ 29.764832] ? ist_end_non_atomic+0x10/0x10 [ 29.768346] RAX: 000000000000003a RBX: ffff888095598950 RCX: 0000000000000000 [ 29.772646] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.779891] RDX: 0000000000000000 RSI: ffffffff878bb940 RDI: ffffed1016637edb [ 29.779897] RBP: ffff8880a965adc0 R08: 000000000000003a R09: 0000000000000000 [ 29.784283] report_bug+0x208/0x249 [ 29.791528] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b139a1c0 [ 29.798778] do_error_trap+0x195/0x2d0 [ 29.802379] R13: ffff8880a1dc8bc0 R14: ffff888095598958 R15: ffff8880954808d8 [ 29.809723] ? math_error+0x2d0/0x2d0 [ 29.813586] FS: 0000000000b6b880(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 [ 29.820837] ? ___preempt_schedule+0x16/0x18 [ 29.824605] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.824611] CR2: 0000559533779ed8 CR3: 00000000abce8000 CR4: 00000000001406e0 [ 29.832819] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.837216] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.843103] invalid_op+0x1b/0x40 [ 29.850360] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.855200] RIP: 0010:sysfs_warn_dup.cold+0x17/0x2d [ 29.862461] Call Trace: [ 29.865894] RSP: 0018:ffff8880b291f728 EFLAGS: 00010282 [ 29.873153] sysfs_create_dir_ns+0x16f/0x1d0 [ 29.878154] RAX: 000000000000003a RBX: ffff8880954808d0 RCX: 0000000000000000 [ 29.880738] kobject_add_internal+0x28b/0x930 [ 29.886082] RDX: 0000000000000000 RSI: ffffffff878bb940 RDI: ffffed1016523edb [ 29.890590] kobject_init_and_add+0xde/0x120 [ 29.897944] RBP: ffff88809568ccc0 R08: 000000000000003a R09: 0000000000000000 [ 29.902443] ? kobject_create_and_add+0x200/0x200 [ 29.909701] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b139a1c0 [ 29.914088] ? vsnprintf+0x260/0x1340 [ 29.921331] R13: ffff8880b611ed00 R14: ffff8880954808d8 R15: ffff8880954dc918 [ 29.921352] ? sysfs_warn_dup.cold+0x17/0x2d [ 29.926164] gfs2_sys_fs_add+0x184/0x3f0 [ 29.933844] sysfs_create_dir_ns+0x16f/0x1d0 [ 29.937631] ? recover_store+0x100/0x100 [ 29.944894] kobject_add_internal+0x28b/0x930 [ 29.949299] ? snprintf+0xa5/0xd0 [ 29.953340] kobject_init_and_add+0xde/0x120 [ 29.957735] ? memcpy+0x35/0x50 [ 29.961768] ? kobject_create_and_add+0x200/0x200 [ 29.966241] fill_super+0x118b/0x2310 [ 29.969669] ? vsnprintf+0x260/0x1340 [ 29.974054] ? vsnprintf+0x260/0x1340 [ 29.977315] gfs2_sys_fs_add+0x184/0x3f0 [ 29.982132] ? gfs2_online_uevent+0x1b0/0x1b0 [ 29.985930] ? recover_store+0x100/0x100 [ 29.989705] ? pointer+0x9e0/0x9e0 [ 29.993483] ? snprintf+0xa5/0xd0 [ 29.997605] ? snprintf+0xa5/0xd0 [ 30.002078] ? memcpy+0x35/0x50 [ 30.006110] ? vsprintf+0x30/0x30 [ 30.009639] fill_super+0x118b/0x2310 [ 30.013070] ? gfs2_open+0x160/0x160 [ 30.016519] ? vsnprintf+0x260/0x1340 [ 30.019790] ? set_blocksize+0x125/0x380 [ 30.023236] ? gfs2_online_uevent+0x1b0/0x1b0 [ 30.027027] gfs2_mount+0x439/0x502 [ 30.030713] ? pointer+0x9e0/0x9e0 [ 30.034523] ? fill_super+0x2310/0x2310 [ 30.038575] ? snprintf+0xa5/0xd0 [ 30.043057] ? alloc_pages_current+0x15d/0x260 [ 30.046648] ? vsprintf+0x30/0x30 [ 30.050165] ? __lockdep_init_map+0x100/0x560 [ 30.054133] ? gfs2_open+0x160/0x160 [ 30.057561] mount_fs+0x92/0x2a0 [ 30.062120] ? set_blocksize+0x125/0x380 [ 30.065554] vfs_kern_mount.part.0+0x5b/0x470 [ 30.070023] gfs2_mount+0x439/0x502 [ 30.073732] do_mount+0xe53/0x2a00 [ 30.077074] ? fill_super+0x2310/0x2310 [ 30.081118] ? copy_mount_string+0x40/0x40 [ 30.085596] ? alloc_pages_current+0x15d/0x260 [ 30.089195] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 30.092710] ? __lockdep_init_map+0x100/0x560 [ 30.096659] ? copy_mnt_ns+0xa30/0xa30 [ 30.100889] mount_fs+0x92/0x2a0 [ 30.105447] ? copy_mount_options+0x1fa/0x2f0 [ 30.110443] vfs_kern_mount.part.0+0x5b/0x470 [ 30.114914] ? copy_mnt_ns+0xa30/0xa30 [ 30.118780] do_mount+0xe53/0x2a00 [ 30.122120] SyS_mount+0xa8/0x120 [ 30.126595] ? copy_mount_string+0x40/0x40 [ 30.131061] ? copy_mnt_ns+0xa30/0xa30 [ 30.134923] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 30.138457] do_syscall_64+0x1d5/0x640 [ 30.141977] ? copy_mnt_ns+0xa30/0xa30 [ 30.146191] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.150051] ? copy_mount_options+0x1fa/0x2f0 [ 30.155059] RIP: 0033:0x45c56a [ 30.158926] ? copy_mnt_ns+0xa30/0xa30 [ 30.162796] RSP: 002b:00007fff360837e8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 [ 30.167974] SyS_mount+0xa8/0x120 [ 30.172441] RAX: ffffffffffffffda RBX: 00007fff36083840 RCX: 000000000045c56a [ 30.175615] ? copy_mnt_ns+0xa30/0xa30 [ 30.179475] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff36083800 [ 30.187182] do_syscall_64+0x1d5/0x640 [ 30.190611] RBP: 00007fff36083800 R08: 00007fff36083840 R09: 0000000000000000 [ 30.197871] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 30.201722] R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000091c [ 30.201727] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 30.208995] RIP: 0033:0x45c56a [ 30.212863] Code: [ 30.220104] RSP: 002b:00007fff360837e8 EFLAGS: 00000293 ORIG_RAX: 00000000000000a5 [ 30.225297] f9 [ 30.232546] RAX: ffffffffffffffda RBX: 00007fff36083840 RCX: 000000000045c56a [ 30.239794] f1 [ 30.243248] RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fff36083800 [ 30.245373] 8b [ 30.253055] RBP: 00007fff36083800 R08: 00007fff36083840 R09: 0000000000000000 [ 30.253061] R10: 0000000000000000 R11: 0000000000000293 R12: 000000000000091c [ 30.254926] e8 [ 30.262178] R13: 0000000000000004 R14: 0000000000000003 R15: 0000000000000003 [ 30.296832] a9 06 db ff eb d8 e8 a2 06 db ff e9 6d ff ff ff e8 48 36 b1 ff 4c 89 ea 48 89 ee 48 c7 c7 20 a0 95 87 e8 47 c2 9f ff <0f> 0b 48 89 ef 5d 41 5c 41 5d e9 b7 db da ff 90 90 90 90 90 90 [ 30.314853] ---[ end trace 94a9d7d21dd7af32 ]--- [ 30.320261] Kernel Offset: disabled [ 30.323924] Rebooting in 86400 seconds..