[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.889675] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.539943] random: sshd: uninitialized urandom read (32 bytes read) [ 26.976689] random: sshd: uninitialized urandom read (32 bytes read) [ 27.708497] random: sshd: uninitialized urandom read (32 bytes read) [ 27.868690] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 33.349991] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.442190] FAULT_INJECTION: forcing a failure. [ 33.442190] name failslab, interval 1, probability 0, space 0, times 1 [ 33.453508] CPU: 1 PID: 4539 Comm: syz-executor708 Not tainted 4.17.0-rc3+ #25 [ 33.460856] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.470194] Call Trace: [ 33.472790] dump_stack+0x1b9/0x294 [ 33.476401] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.481571] ? __mutex_lock+0x7d9/0x17f0 [ 33.485616] should_fail.cold.4+0xa/0x1a [ 33.489660] ? fault_create_debugfs_attr+0x1f0/0x1f0 [ 33.494755] ? kasan_kmalloc+0xc4/0xe0 [ 33.498628] ? graph_lock+0x170/0x170 [ 33.502427] ? find_held_lock+0x36/0x1c0 [ 33.506471] ? __lock_is_held+0xb5/0x140 [ 33.510518] ? check_same_owner+0x320/0x320 [ 33.514820] ? kasan_check_write+0x14/0x20 [ 33.519035] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 33.523959] ? rcu_note_context_switch+0x710/0x710 [ 33.528873] __should_failslab+0x124/0x180 [ 33.533091] should_failslab+0x9/0x14 [ 33.536870] kmem_cache_alloc+0x2af/0x760 [ 33.540999] ? __mutex_unlock_slowpath+0x180/0x8a0 [ 33.545910] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 33.550909] __kernfs_new_node+0xe7/0x580 [ 33.555038] ? kernfs_dop_revalidate+0x3c0/0x3c0 [ 33.559774] ? mutex_unlock+0xd/0x10 [ 33.563467] ? kernfs_activate+0x20e/0x2a0 [ 33.567696] ? kernfs_walk_and_get_ns+0x320/0x320 [ 33.572525] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 33.578048] ? kernfs_link_sibling+0x1d2/0x3b0 [ 33.582618] kernfs_new_node+0x80/0xf0 [ 33.586494] __kernfs_create_file+0x4d/0x330 [ 33.590889] sysfs_add_file_mode_ns+0x21a/0x560 [ 33.595546] sysfs_add_file+0x4e/0x60 [ 33.599329] sysfs_merge_group+0xfa/0x230 [ 33.603462] dpm_sysfs_add+0x161/0x210 [ 33.607330] device_add+0xa11/0x16d0 [ 33.611023] ? device_private_init+0x230/0x230 [ 33.615584] ? kfree+0x1e9/0x260 [ 33.618932] ? kfree_const+0x5e/0x70 [ 33.622631] device_create_groups_vargs+0x1ff/0x270 [ 33.627628] device_create_vargs+0x46/0x60 [ 33.631846] bdi_register_va.part.10+0xbb/0x970 [ 33.636496] ? __lockdep_init_map+0x105/0x590 [ 33.640969] ? cgwb_kill+0x630/0x630 [ 33.644660] ? lockdep_init_map+0x9/0x10 [ 33.648699] ? __init_waitqueue_head+0x96/0x140 [ 33.653345] ? init_wait_entry+0x1b0/0x1b0 [ 33.657560] ? __lockdep_init_map+0x105/0x590 [ 33.662037] ? pm_runtime_init+0x451/0x540 [ 33.666251] ? update_pm_runtime_accounting+0x1b0/0x1b0 [ 33.671600] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.677137] ? put_dec_trunc8+0x273/0x300 [ 33.681280] bdi_register+0x101/0x110 [ 33.685060] ? bdi_register_va+0x80/0x80 [ 33.689105] ? graph_lock+0x170/0x170 [ 33.692907] bdi_register_owner+0x5e/0x100 [ 33.697140] __device_add_disk+0xf07/0x1340 [ 33.701444] ? blk_alloc_devt+0x2a0/0x2a0 [ 33.705575] ? vsnprintf+0x242/0x1b40 [ 33.709357] ? pointer+0xa20/0xa20 [ 33.712878] ? __mutex_init+0x1ef/0x280 [ 33.716848] ? sprintf+0xa7/0xd0 [ 33.720195] ? scnprintf+0x120/0x120 [ 33.723891] ? __lockdep_init_map+0x105/0x590 [ 33.728367] device_add_disk+0x22/0x30 [ 33.732235] loop_add+0x70b/0x9c0 [ 33.735679] ? loop_queue_rq+0x640/0x640 [ 33.739721] ? module_unload_free+0x5b0/0x5b0 [ 33.744196] loop_probe+0x185/0x1c0 [ 33.747799] ? loop_control_ioctl+0x500/0x500 [ 33.752277] kobj_lookup+0x269/0x460 [ 33.755973] ? loop_control_ioctl+0x500/0x500 [ 33.760453] get_gendisk+0x4c/0x380 [ 33.764061] blkdev_get+0x16a/0xb30 [ 33.767669] ? kasan_check_write+0x14/0x20 [ 33.771884] ? do_raw_spin_lock+0xc1/0x200 [ 33.776101] ? bdget+0x5c0/0x5c0 [ 33.779447] ? mntput+0x74/0xa0 [ 33.782718] ? path_put+0x50/0x70 [ 33.786163] ? lookup_bdev+0xb4/0x240 [ 33.789945] ? blkdev_open+0x280/0x280 [ 33.793817] blkdev_get_by_path+0x5c/0xe0 [ 33.797947] mount_bdev+0x5d/0x3e0 [ 33.801469] ? fuse_get_root_inode+0x190/0x190 [ 33.806033] fuse_mount_blk+0x34/0x40 [ 33.809816] mount_fs+0xae/0x328 [ 33.813166] vfs_kern_mount.part.34+0xd4/0x4d0 [ 33.817736] ? may_umount+0xb0/0xb0 [ 33.821344] ? _raw_read_unlock+0x22/0x30 [ 33.825469] ? __get_fs_type+0x97/0xc0 [ 33.829336] do_mount+0x564/0x3070 [ 33.832857] ? copy_mount_string+0x40/0x40 [ 33.837073] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.842069] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 33.846803] ? no_context+0x136/0x960 [ 33.850581] ? __do_page_fault+0x441/0xe40 [ 33.854795] ? retint_kernel+0x10/0x10 [ 33.858666] ? memset+0x31/0x40 [ 33.861925] ? copy_mount_options+0x285/0x380 [ 33.866401] ksys_mount+0x12d/0x140 [ 33.870008] __x64_sys_mount+0xbe/0x150 [ 33.873960] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.878955] do_syscall_64+0x1b1/0x800 [ 33.882823] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.887730] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.892638] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.897982] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.902805] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.907969] RIP: 0033:0x4404a9 [ 33.911137] RSP: 002b:00007fffca04f5f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 33.918824] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004404a9 [ 33.926077] RDX: 00000000004a1d2c RSI: 0000000020000080 RDI: 00000000200000c0 [ 33.933335] RBP: 0030656c69662f2e R08: 00007fffca04f610 R09: 0000000000000000 [ 33.940584] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401d90 [ 33.947844] R13: 0000000000401e20 R14: 0000000000000000 R15: 0000000000000000 [ 33.956887] WARNING: CPU: 1 PID: 4539 at block/genhd.c:685 __device_add_disk+0x104a/0x1340 [ 33.965282] Kernel panic - not syncing: panic_on_warn set ... [ 33.965282] [ 33.972627] CPU: 1 PID: 4539 Comm: syz-executor708 Not tainted 4.17.0-rc3+ #25 [ 33.979964] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.989293] Call Trace: [ 33.991871] dump_stack+0x1b9/0x294 [ 33.995483] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.000656] ? __device_add_disk+0xfe0/0x1340 [ 34.005143] panic+0x22f/0x4de [ 34.008317] ? add_taint.cold.5+0x16/0x16 [ 34.012449] ? __warn.cold.8+0x148/0x1b3 [ 34.016490] ? __warn.cold.8+0x117/0x1b3 [ 34.020539] ? __device_add_disk+0x104a/0x1340 [ 34.025102] __warn.cold.8+0x163/0x1b3 [ 34.028969] ? __device_add_disk+0x104a/0x1340 [ 34.033544] report_bug+0x252/0x2d0 [ 34.037173] do_error_trap+0x1de/0x490 [ 34.041067] ? init_wait_entry+0x1b0/0x1b0 [ 34.045307] ? math_error+0x420/0x420 [ 34.049109] ? __lockdep_init_map+0x105/0x590 [ 34.053621] ? pm_runtime_init+0x451/0x540 [ 34.057836] ? update_pm_runtime_accounting+0x1b0/0x1b0 [ 34.063182] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.068703] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.073526] do_invalid_op+0x1b/0x20 [ 34.077222] invalid_op+0x14/0x20 [ 34.080655] RIP: 0010:__device_add_disk+0x104a/0x1340 [ 34.085831] RSP: 0018:ffff8801ad26f4e0 EFLAGS: 00010293 [ 34.091204] RAX: ffff8801d908e380 RBX: ffff8801d95d8e80 RCX: ffffffff83437c33 [ 34.098453] RDX: 0000000000000000 RSI: ffffffff83437d6a RDI: 0000000000000005 [ 34.105702] RBP: ffff8801ad26f6b0 R08: ffff8801d908e380 R09: 0000000000000006 [ 34.112949] R10: ffff8801d908e380 R11: 0000000000000000 R12: 00000000fffffff4 [ 34.120197] R13: ffff8801ad26f688 R14: ffff8801d95d93e0 R15: ffff8801d95d8e84 [ 34.127458] ? __device_add_disk+0xf13/0x1340 [ 34.131931] ? __device_add_disk+0x104a/0x1340 [ 34.136498] ? blk_alloc_devt+0x2a0/0x2a0 [ 34.140624] ? vsnprintf+0x242/0x1b40 [ 34.144423] ? pointer+0xa20/0xa20 [ 34.147948] ? __mutex_init+0x1ef/0x280 [ 34.151904] ? sprintf+0xa7/0xd0 [ 34.155252] ? scnprintf+0x120/0x120 [ 34.158947] ? __lockdep_init_map+0x105/0x590 [ 34.163423] device_add_disk+0x22/0x30 [ 34.167292] loop_add+0x70b/0x9c0 [ 34.170726] ? loop_queue_rq+0x640/0x640 [ 34.174765] ? module_unload_free+0x5b0/0x5b0 [ 34.179241] loop_probe+0x185/0x1c0 [ 34.182860] ? loop_control_ioctl+0x500/0x500 [ 34.187350] kobj_lookup+0x269/0x460 [ 34.191048] ? loop_control_ioctl+0x500/0x500 [ 34.195524] get_gendisk+0x4c/0x380 [ 34.199150] blkdev_get+0x16a/0xb30 [ 34.202757] ? kasan_check_write+0x14/0x20 [ 34.206975] ? do_raw_spin_lock+0xc1/0x200 [ 34.211189] ? bdget+0x5c0/0x5c0 [ 34.214536] ? mntput+0x74/0xa0 [ 34.217796] ? path_put+0x50/0x70 [ 34.221230] ? lookup_bdev+0xb4/0x240 [ 34.225010] ? blkdev_open+0x280/0x280 [ 34.228880] blkdev_get_by_path+0x5c/0xe0 [ 34.233009] mount_bdev+0x5d/0x3e0 [ 34.236530] ? fuse_get_root_inode+0x190/0x190 [ 34.241091] fuse_mount_blk+0x34/0x40 [ 34.244876] mount_fs+0xae/0x328 [ 34.248229] vfs_kern_mount.part.34+0xd4/0x4d0 [ 34.252789] ? may_umount+0xb0/0xb0 [ 34.256395] ? _raw_read_unlock+0x22/0x30 [ 34.260533] ? __get_fs_type+0x97/0xc0 [ 34.264420] do_mount+0x564/0x3070 [ 34.267944] ? copy_mount_string+0x40/0x40 [ 34.272160] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.277160] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 34.281897] ? no_context+0x136/0x960 [ 34.285673] ? __do_page_fault+0x441/0xe40 [ 34.289891] ? retint_kernel+0x10/0x10 [ 34.293763] ? memset+0x31/0x40 [ 34.297148] ? copy_mount_options+0x285/0x380 [ 34.301641] ksys_mount+0x12d/0x140 [ 34.305247] __x64_sys_mount+0xbe/0x150 [ 34.309199] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 34.314199] do_syscall_64+0x1b1/0x800 [ 34.318067] ? syscall_return_slowpath+0x5c0/0x5c0 [ 34.322976] ? syscall_return_slowpath+0x30f/0x5c0 [ 34.327888] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 34.333234] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.338059] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.343228] RIP: 0033:0x4404a9 [ 34.346394] RSP: 002b:00007fffca04f5f8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 34.354085] RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00000000004404a9 [ 34.361338] RDX: 00000000004a1d2c RSI: 0000000020000080 RDI: 00000000200000c0 [ 34.368587] RBP: 0030656c69662f2e R08: 00007fffca04f610 R09: 0000000000000000 [ 34.375836] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401d90 [ 34.383084] R13: 0000000000401e20 R14: 0000000000000000 R15: 0000000000000000 [ 34.390965] Dumping ftrace buffer: [ 34.394614] (ftrace buffer empty) [ 34.398305] Kernel Offset: disabled [ 34.401927] Rebooting in 86400 seconds..