[ OK ] Found device /dev/ttyS0. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Getty on tty6. [ OK ] Started Getty on tty5. [ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 '10.128.0.25' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.198417] FAULT_INJECTION: forcing a failure. [ 27.198417] name failslab, interval 1, probability 0, space 0, times 1 [ 27.209799] CPU: 0 PID: 7949 Comm: syz-executor247 Not tainted 4.14.277-syzkaller #0 [ 27.217676] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.227026] Call Trace: [ 27.229612] dump_stack+0x1b2/0x281 [ 27.233240] should_fail.cold+0x10a/0x149 [ 27.237387] should_failslab+0xd6/0x130 [ 27.241362] kmem_cache_alloc+0x28e/0x3c0 [ 27.245504] __kernfs_new_node+0x6f/0x470 [ 27.249641] kernfs_create_dir_ns+0x8c/0x200 [ 27.254292] sysfs_create_dir_ns+0xb7/0x1d0 [ 27.258620] kobject_add_internal+0x28b/0x930 [ 27.263092] kobject_add+0x11f/0x180 [ 27.266781] ? kset_create_and_add+0x190/0x190 [ 27.271398] device_add+0x33f/0x15c0 [ 27.275092] ? device_is_dependent+0x2a0/0x2a0 [ 27.279653] device_add_disk+0x6a2/0xdc0 [ 27.283693] ? sprintf+0xa7/0xd0 [ 27.287038] ? blk_alloc_devt+0x310/0x310 [ 27.291168] ? __lockdep_init_map+0x100/0x560 [ 27.295638] ? __lockdep_init_map+0x100/0x560 [ 27.300109] loop_add+0x615/0x830 [ 27.303536] ? loop_queue_rq+0x280/0x280 [ 27.307571] ? loop_queue_work+0x21e0/0x21e0 [ 27.311956] loop_control_ioctl+0x11a/0x3f0 [ 27.316254] ? loop_lookup+0x190/0x190 [ 27.320116] ? loop_lookup+0x190/0x190 [ 27.323978] do_vfs_ioctl+0x75a/0xff0 [ 27.327753] ? ioctl_preallocate+0x1a0/0x1a0 [ 27.332140] ? vfs_write+0x319/0x4d0 [ 27.335829] ? SyS_write+0x14d/0x210 [ 27.339519] ? security_file_ioctl+0x83/0xb0 [ 27.343903] SyS_ioctl+0x7f/0xb0 [ 27.347257] ? do_vfs_ioctl+0xff0/0xff0 [ 27.351206] do_syscall_64+0x1d5/0x640 [ 27.355074] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.360236] RIP: 0033:0x7fc440e76689 [ 27.363922] RSP: 002b:00007ffedda29ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 27.371628] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fc440e76689 [ 27.378877] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 27.386120] RBP: 00007ffedda29af0 R08: 0000000000000002 R09: 00007fc440003438 [ 27.393365] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 27.400610] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.408787] kobject_add_internal failed for loop0 (error: -12 parent: block) [ 27.416577] ------------[ cut here ]------------ [ 27.421323] kernel BUG at fs/sysfs/group.c:113! [ 27.426591] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 27.431938] Modules linked in: [ 27.435106] CPU: 0 PID: 7949 Comm: syz-executor247 Not tainted 4.14.277-syzkaller #0 [ 27.442957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.452284] task: ffff8880b34024c0 task.stack: ffff8880a2ed8000 [ 27.458317] RIP: 0010:internal_create_group+0x55f/0x710 [ 27.463649] RSP: 0018:ffff8880a2edfb00 EFLAGS: 00010297 [ 27.468986] RAX: ffff8880b34024c0 RBX: ffff8880b3c5aaa0 RCX: 0000000000000000 [ 27.476229] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880b3c5aaa0 [ 27.483470] RBP: ffff8880aa9e0f30 R08: ffffffff8b9dd0c0 R09: 0000000000000000 [ 27.490716] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff88faf460 [ 27.497960] R13: ffff8880aa9e1178 R14: 0000000000000000 R15: ffff8880b3c5aad0 [ 27.505202] FS: 00005555565da300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 27.513399] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.519251] CR2: 00007f5c2262f6c0 CR3: 00000000b0055000 CR4: 00000000003406f0 [ 27.526497] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.533741] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.540986] Call Trace: [ 27.543554] blk_register_queue+0xd3/0x350 [ 27.547763] device_add_disk+0x97c/0xdc0 [ 27.551802] ? sprintf+0xa7/0xd0 [ 27.555141] ? blk_alloc_devt+0x310/0x310 [ 27.559350] ? __lockdep_init_map+0x100/0x560 [ 27.563817] ? __lockdep_init_map+0x100/0x560 [ 27.568294] loop_add+0x615/0x830 [ 27.571722] ? loop_queue_rq+0x280/0x280 [ 27.575753] ? loop_queue_work+0x21e0/0x21e0 [ 27.580141] loop_control_ioctl+0x11a/0x3f0 [ 27.584520] ? loop_lookup+0x190/0x190 [ 27.588379] ? loop_lookup+0x190/0x190 [ 27.592242] do_vfs_ioctl+0x75a/0xff0 [ 27.596016] ? ioctl_preallocate+0x1a0/0x1a0 [ 27.600399] ? vfs_write+0x319/0x4d0 [ 27.604085] ? SyS_write+0x14d/0x210 [ 27.607771] ? security_file_ioctl+0x83/0xb0 [ 27.612152] SyS_ioctl+0x7f/0xb0 [ 27.615490] ? do_vfs_ioctl+0xff0/0xff0 [ 27.619439] do_syscall_64+0x1d5/0x640 [ 27.623313] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.628484] RIP: 0033:0x7fc440e76689 [ 27.632168] RSP: 002b:00007ffedda29ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 27.639852] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fc440e76689 [ 27.647097] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 27.654343] RBP: 00007ffedda29af0 R08: 0000000000000002 R09: 00007fc440003438 [ 27.661585] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 27.668825] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.676089] Code: 48 c1 ea 03 80 3c 02 00 0f 84 9c fd ff ff e8 f9 0c db ff e9 92 fd ff ff e8 cf 54 b1 ff 4d 85 f6 0f 85 16 fb ff ff e8 c1 54 b1 ff <0f> 0b e8 ba 54 b1 ff 49 83 fe ef 74 18 e8 af 54 b1 ff 45 89 f7 [ 27.695273] RIP: internal_create_group+0x55f/0x710 RSP: ffff8880a2edfb00 [ 27.702468] ---[ end trace 18fc350eaae62ecd ]--- [ 27.707240] Kernel panic - not syncing: Fatal exception [ 27.712752] Kernel Offset: disabled [ 27.716360] Rebooting in 86400 seconds..