[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 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 Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.20' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 27.549328] FAULT_INJECTION: forcing a failure. [ 27.549328] name failslab, interval 1, probability 0, space 0, times 1 [ 27.560723] CPU: 1 PID: 8020 Comm: syz-executor420 Not tainted 4.14.282-syzkaller #0 [ 27.568584] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.577918] Call Trace: [ 27.580488] dump_stack+0x1b2/0x281 [ 27.584094] should_fail.cold+0x10a/0x149 [ 27.588221] should_failslab+0xd6/0x130 [ 27.592177] kmem_cache_alloc+0x28e/0x3c0 [ 27.596306] __kernfs_new_node+0x6f/0x470 [ 27.600433] kernfs_new_node+0x7b/0xe0 [ 27.604304] __kernfs_create_file+0x3d/0x320 [ 27.608690] sysfs_add_file_mode_ns+0x1e1/0x450 [ 27.613337] sysfs_merge_group+0xdc/0x200 [ 27.617475] dpm_sysfs_add+0x122/0x1c0 [ 27.621339] device_add+0x977/0x15c0 [ 27.625051] ? device_is_dependent+0x2a0/0x2a0 [ 27.629619] ? kfree+0x1f0/0x250 [ 27.632968] device_create_groups_vargs+0x1dc/0x250 [ 27.637965] device_create_vargs+0x3a/0x50 [ 27.642196] bdi_register_va.part.0+0x35/0x650 [ 27.646761] bdi_register+0x101/0x110 [ 27.650538] ? bdi_register_va+0x80/0x80 [ 27.654577] ? vsnprintf+0x260/0x1340 [ 27.658358] bdi_register_owner+0x59/0xf0 [ 27.662487] device_add_disk+0x5bb/0xdc0 [ 27.666531] ? sprintf+0xa7/0xd0 [ 27.669876] ? blk_alloc_devt+0x310/0x310 [ 27.674017] ? __lockdep_init_map+0x100/0x560 [ 27.678497] ? __lockdep_init_map+0x100/0x560 [ 27.682972] loop_add+0x615/0x830 [ 27.686408] ? loop_queue_rq+0x280/0x280 [ 27.690451] ? loop_queue_work+0x21e0/0x21e0 [ 27.694839] ? do_fault_around+0x35e/0x620 [ 27.699058] loop_control_ioctl+0x11a/0x3f0 [ 27.703363] ? loop_lookup+0x190/0x190 [ 27.707232] ? loop_lookup+0x190/0x190 [ 27.711115] do_vfs_ioctl+0x75a/0xff0 [ 27.714910] ? ioctl_preallocate+0x1a0/0x1a0 [ 27.719298] ? vfs_write+0x319/0x4d0 [ 27.723002] ? SyS_write+0x14d/0x210 [ 27.726692] ? security_file_ioctl+0x83/0xb0 [ 27.731092] SyS_ioctl+0x7f/0xb0 [ 27.734433] ? do_vfs_ioctl+0xff0/0xff0 [ 27.738383] do_syscall_64+0x1d5/0x640 [ 27.742249] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 27.747415] RIP: 0033:0x7f4bc00bb079 [ 27.751101] RSP: 002b:00007fff7c0ccd88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 27.758801] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f4bc00bb079 [ 27.766047] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 27.773298] RBP: 00007fff7c0ccda0 R08: 0000000000000002 R09: 0000000000000001 [ 27.780559] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 27.787804] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 27.814220] kasan: CONFIG_KASAN_INLINE enabled [ 27.818953] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 27.826409] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.832714] Modules linked in: [ 27.835885] CPU: 0 PID: 8020 Comm: syz-executor420 Not tainted 4.14.282-syzkaller #0 [ 27.843739] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.853068] task: ffff8880b3f20480 task.stack: ffff8880b3138000 [ 27.859103] RIP: 0010:sysfs_do_create_link_sd+0x56/0x120 [ 27.864533] RSP: 0018:ffff8880b313fb48 EFLAGS: 00010202 [ 27.869875] RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 00000000000044e5 [ 27.877121] RDX: 0000000000000008 RSI: 0000000000000001 RDI: 0000000000000040 [ 27.884373] RBP: ffffffff87cbc460 R08: ffffffff8b9c81e8 R09: 00000000000400c7 [ 27.891622] R10: ffff8880b3f20d30 R11: ffff8880b3f20480 R12: ffff8880af34e1c0 [ 27.898892] R13: ffffffff87cbc460 R14: 0000000000000001 R15: ffff888095aa615c [ 27.906167] FS: 0000555555d79300(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 27.914376] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.920239] CR2: 00007f50631fb710 CR3: 0000000099f90000 CR4: 00000000003406f0 [ 27.927495] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.934746] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.941999] Call Trace: [ 27.944568] sysfs_create_link+0x5f/0xc0 [ 27.948608] device_add_disk+0x9f8/0xdc0 [ 27.952731] ? sprintf+0xa7/0xd0 [ 27.956073] ? blk_alloc_devt+0x310/0x310 [ 27.960196] ? __lockdep_init_map+0x100/0x560 [ 27.964670] ? __lockdep_init_map+0x100/0x560 [ 27.969144] loop_add+0x615/0x830 [ 27.972571] ? loop_queue_rq+0x280/0x280 [ 27.976631] ? loop_queue_work+0x21e0/0x21e0 [ 27.981013] ? do_fault_around+0x35e/0x620 [ 27.985231] loop_control_ioctl+0x11a/0x3f0 [ 27.989538] ? loop_lookup+0x190/0x190 [ 27.993417] ? loop_lookup+0x190/0x190 [ 27.997285] do_vfs_ioctl+0x75a/0xff0 [ 28.001058] ? ioctl_preallocate+0x1a0/0x1a0 [ 28.005453] ? vfs_write+0x319/0x4d0 [ 28.009148] ? SyS_write+0x14d/0x210 [ 28.012844] ? security_file_ioctl+0x83/0xb0 [ 28.017226] SyS_ioctl+0x7f/0xb0 [ 28.020568] ? do_vfs_ioctl+0xff0/0xff0 [ 28.024517] do_syscall_64+0x1d5/0x640 [ 28.028382] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 28.033548] RIP: 0033:0x7f4bc00bb079 [ 28.037234] RSP: 002b:00007fff7c0ccd88 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 28.044916] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f4bc00bb079 [ 28.052164] RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 [ 28.059412] RBP: 00007fff7c0ccda0 R08: 0000000000000002 R09: 0000000000000001 [ 28.066665] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 28.073907] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 28.081156] Code: 84 a1 00 00 00 e8 cb 5b b1 ff 48 c7 c7 80 ce 04 89 e8 8f 8c 80 05 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 a7 00 00 00 4c 8b 6b 30 4d 85 ed 74 4f e8 92 [ 28.100218] RIP: sysfs_do_create_link_sd+0x56/0x120 RSP: ffff8880b313fb48 [ 28.107198] ---[ end trace 6dfae295f1ad8e44 ]--- [ 28.111946] Kernel panic - not syncing: Fatal exception [ 28.117472] Kernel Offset: disabled [ 28.121081] Rebooting in 86400 seconds..