[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.307645] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.297939] random: sshd: uninitialized urandom read (32 bytes read) [ 24.716629] random: sshd: uninitialized urandom read (32 bytes read) [ 25.429564] random: sshd: uninitialized urandom read (32 bytes read) [ 25.580393] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 31.039372] random: sshd: uninitialized urandom read (32 bytes read) [ 32.768619] [ 32.770278] ================================ [ 32.774663] WARNING: inconsistent lock state [ 32.779044] 4.17.0-rc2+ #42 Not tainted [ 32.782986] -------------------------------- [ 32.787368] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. [ 32.793489] swapper/0/0 [HC1[1]:SC0[0]:HE0:SE1] takes: [ 32.798737] (ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire.part.82+0x0/0x30 [ 32.806956] {HARDIRQ-ON-W} state was registered at: [ 32.811950] lock_acquire+0x1dc/0x520 [ 32.815812] fs_reclaim_acquire.part.82+0x24/0x30 [ 32.820715] fs_reclaim_acquire+0x14/0x20 [ 32.824924] kmem_cache_alloc_node_trace+0x39/0x770 [ 32.830010] alloc_worker+0xbd/0x2e0 [ 32.833793] init_rescuer.part.25+0x1f/0x190 [ 32.838263] workqueue_init+0x51f/0x7d0 [ 32.842301] kernel_init_freeable+0x2ad/0x58e [ 32.846858] kernel_init+0x11/0x1b3 [ 32.850548] ret_from_fork+0x3a/0x50 [ 32.854321] irq event stamp: 296056 [ 32.857932] hardirqs last enabled at (296053): [] default_idle+0x8d/0x440 [ 32.866486] hardirqs last disabled at (296054): [] interrupt_entry+0xb5/0xf0 [ 32.875214] softirqs last enabled at (296056): [] _local_bh_enable+0x1c/0x30 [ 32.884029] softirqs last disabled at (296055): [] irq_enter+0xa0/0xd0 [ 32.892228] [ 32.892228] other info that might help us debug this: [ 32.898867] Possible unsafe locking scenario: [ 32.898867] [ 32.904896] CPU0 [ 32.907460] ---- [ 32.910015] lock(fs_reclaim); [ 32.913269] [ 32.915998] lock(fs_reclaim); [ 32.919430] [ 32.919430] *** DEADLOCK *** [ 32.919430] [ 32.925466] no locks held by swapper/0/0. [ 32.929582] [ 32.929582] stack backtrace: [ 32.934055] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc2+ #42 [ 32.940614] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.949940] Call Trace: [ 32.952495] [ 32.954637] dump_stack+0x1b9/0x294 [ 32.958240] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.963405] ? vprintk_func+0x81/0xe7 [ 32.967180] print_usage_bug.cold.59+0x320/0x41a [ 32.971916] ? save_stack_trace+0x1a/0x20 [ 32.976038] mark_lock+0x1034/0x19e0 [ 32.979734] ? check_usage_backwards+0x3a0/0x3a0 [ 32.984464] ? print_usage_bug+0xc0/0xc0 [ 32.988498] ? save_trace+0xe0/0x290 [ 32.992185] ? print_usage_bug+0xc0/0xc0 [ 32.996219] ? mark_lock+0xafe/0x19e0 [ 32.999995] ? check_usage_backwards+0x3a0/0x3a0 [ 33.004730] ? print_usage_bug+0xc0/0xc0 [ 33.008767] ? scsi_mq_uninit_cmd+0x30/0x30 [ 33.013064] __lock_acquire+0x1595/0x5140 [ 33.017186] ? __lock_acquire+0x7f5/0x5140 [ 33.021395] ? find_held_lock+0x36/0x1c0 [ 33.025433] ? debug_check_no_locks_freed+0x310/0x310 [ 33.030599] ? debug_check_no_locks_freed+0x310/0x310 [ 33.035765] ? debug_check_no_locks_freed+0x310/0x310 [ 33.040928] ? lock_downgrade+0x8e0/0x8e0 [ 33.045059] ? sha_transform+0x26/0x4449 [ 33.049097] ? kasan_check_read+0x11/0x20 [ 33.053221] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.057605] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.062162] ? memset+0x31/0x40 [ 33.065419] ? memzero_explicit+0xe/0x10 [ 33.069457] ? extract_buf+0x3a3/0x4c0 [ 33.073321] ? graph_lock+0x170/0x170 [ 33.077094] ? crng_fast_load+0x3b0/0x3b0 [ 33.081214] ? graph_lock+0x170/0x170 [ 33.084989] ? account.constprop.30+0x34e/0x700 [ 33.089632] lock_acquire+0x1dc/0x520 [ 33.093408] ? bad_range+0x160/0x160 [ 33.097098] ? lock_release+0xa10/0xa10 [ 33.101047] ? lock_downgrade+0x8e0/0x8e0 [ 33.105170] ? lock_release+0xa10/0xa10 [ 33.109118] ? lock_downgrade+0x8e0/0x8e0 [ 33.113242] fs_reclaim_acquire.part.82+0x24/0x30 [ 33.118067] ? bad_range+0x160/0x160 [ 33.121755] fs_reclaim_acquire+0x14/0x20 [ 33.125880] __kmalloc+0x45/0x760 [ 33.129307] ? trace_hardirqs_off+0xd/0x10 [ 33.133519] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 33.138684] ? crng_reseed+0x427/0x920 [ 33.142546] crng_reseed+0x427/0x920 [ 33.146236] ? _extract_entropy.constprop.32+0x150/0x150 [ 33.151661] ? kasan_check_read+0x11/0x20 [ 33.155786] ? rcu_is_watching+0x85/0x140 [ 33.159910] ? rcu_pm_notify+0xc0/0xc0 [ 33.163773] credit_entropy_bits+0x98d/0xa30 [ 33.168160] ? add_interrupt_randomness+0x494/0x860 [ 33.173151] ? crng_reseed+0x920/0x920 [ 33.177014] ? lock_downgrade+0x8e0/0x8e0 [ 33.181137] ? __mix_pool_bytes+0xde/0x400 [ 33.185349] ? kasan_check_read+0x11/0x20 [ 33.189474] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.193857] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.198415] ? __handle_irq_event_percpu+0x34d/0xad0 [ 33.203502] add_interrupt_randomness+0x494/0x860 [ 33.208324] ? extract_entropy.constprop.29+0x490/0x490 [ 33.213663] ? lock_downgrade+0x8e0/0x8e0 [ 33.217794] ? handle_edge_irq+0x30/0x870 [ 33.221917] handle_irq_event_percpu+0xf9/0x1c0 [ 33.226560] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.231115] ? __handle_irq_event_percpu+0xad0/0xad0 [ 33.236196] ? ktime_get+0x2d9/0x430 [ 33.239888] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.245400] handle_irq_event+0xa7/0x135 [ 33.249436] handle_edge_irq+0x20f/0x870 [ 33.253474] handle_irq+0x18c/0x2e7 [ 33.257079] ? __local_bh_enable+0xef/0x130 [ 33.261382] do_IRQ+0x78/0x190 [ 33.264549] common_interrupt+0xf/0xf [ 33.268328] [ 33.270543] RIP: 0010:native_safe_halt+0x6/0x10 [ 33.275186] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda [ 33.282868] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 33.290112] RDX: 1ffffffff11a3160 RSI: 0000000000000001 RDI: ffffffff88d18b00 [ 33.297355] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 33.304598] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 33.311848] R13: ffffffff88c07c78 R14: ffffffff897beda0 R15: 0000000000000000 [ 33.319099] default_idle+0xc2/0x440 [ 33.322791] ? __sched_text_end+0x3/0x3 [ 33.326751] ? rcu_idle_enter+0x304/0x460 [ 33.330874] ? rcu_eqs_special_set+0x190/0x190 [ 33.335434] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 33.340078] ? mark_tsc_async_resets+0x20/0x20 [ 33.344637] ? tick_nohz_idle_enter+0x219/0x320 [ 33.349280] arch_cpu_idle+0x10/0x20 [ 33.352969] default_idle_call+0x6d/0x90 [ 33.357007] do_idle+0x395/0x560 [ 33.360348] ? arch_cpu_idle_exit+0x70/0x70 [ 33.364643] ? do_idle+0x19e/0x560 [ 33.368156] cpu_startup_entry+0x104/0x120 [ 33.372364] ? cpu_in_idle+0x20/0x20 [ 33.376055] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.381066] ? trace_hardirqs_on+0xd/0x10 [ 33.385197] rest_init+0xe1/0xe4 [ 33.388543] start_kernel+0x906/0x92d [ 33.392319] ? mem_encrypt_init+0xb/0xb [ 33.396270] ? early_idt_handler_common+0x3b/0x60 [ 33.401091] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.406606] ? x86_family+0x3e/0x50 [ 33.410212] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.415725] x86_64_start_reservations+0x29/0x2b [ 33.420457] x86_64_start_kernel+0x76/0x79 [ 33.424669] secondary_startup_64+0xa5/0xb0 [ 33.428969] BUG: sleeping function called from invalid context at mm/slab.h:421 [ 33.436390] in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/0 [ 33.443118] INFO: lockdep is turned off. [ 33.447150] irq event stamp: 296056 [ 33.450758] hardirqs last enabled at (296053): [] default_idle+0x8d/0x440 [ 33.459315] hardirqs last disabled at (296054): [] interrupt_entry+0xb5/0xf0 [ 33.468048] softirqs last enabled at (296056): [] _local_bh_enable+0x1c/0x30 [ 33.476863] softirqs last disabled at (296055): [] irq_enter+0xa0/0xd0 [ 33.485068] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc2+ #42 [ 33.491620] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.500948] Call Trace: [ 33.503505] [ 33.505651] dump_stack+0x1b9/0x294 [ 33.509258] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.514435] ? fs_reclaim_acquire+0x20/0x20 [ 33.518734] ? irq_enter+0xa0/0xd0 [ 33.522271] ? irq_enter+0xa0/0xd0 [ 33.525792] ___might_sleep.cold.87+0x11f/0x13a [ 33.530439] ? check_same_owner+0x320/0x320 [ 33.534737] ? lock_release+0xa10/0xa10 [ 33.538691] __might_sleep+0x95/0x190 [ 33.542472] __kmalloc+0x2b9/0x760 [ 33.545989] ? trace_hardirqs_off+0xd/0x10 [ 33.550209] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 33.555384] ? crng_reseed+0x427/0x920 [ 33.559250] crng_reseed+0x427/0x920 [ 33.562943] ? _extract_entropy.constprop.32+0x150/0x150 [ 33.568375] ? kasan_check_read+0x11/0x20 [ 33.572504] ? rcu_is_watching+0x85/0x140 [ 33.576638] ? rcu_pm_notify+0xc0/0xc0 [ 33.580517] credit_entropy_bits+0x98d/0xa30 [ 33.584905] ? add_interrupt_randomness+0x494/0x860 [ 33.589896] ? crng_reseed+0x920/0x920 [ 33.593763] ? lock_downgrade+0x8e0/0x8e0 [ 33.597888] ? __mix_pool_bytes+0xde/0x400 [ 33.602275] ? kasan_check_read+0x11/0x20 [ 33.606401] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.610785] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.615346] ? __handle_irq_event_percpu+0x34d/0xad0 [ 33.620428] add_interrupt_randomness+0x494/0x860 [ 33.625249] ? extract_entropy.constprop.29+0x490/0x490 [ 33.630593] ? lock_downgrade+0x8e0/0x8e0 [ 33.634718] ? handle_edge_irq+0x30/0x870 [ 33.638843] handle_irq_event_percpu+0xf9/0x1c0 [ 33.643488] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 33.648051] ? __handle_irq_event_percpu+0xad0/0xad0 [ 33.653144] ? ktime_get+0x2d9/0x430 [ 33.656840] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.662365] handle_irq_event+0xa7/0x135 [ 33.666414] handle_edge_irq+0x20f/0x870 [ 33.670457] handle_irq+0x18c/0x2e7 [ 33.674065] ? __local_bh_enable+0xef/0x130 [ 33.678366] do_IRQ+0x78/0x190 [ 33.681535] common_interrupt+0xf/0xf [ 33.685317] [ 33.687534] RIP: 0010:native_safe_halt+0x6/0x10 [ 33.692177] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda [ 33.699862] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 33.707108] RDX: 1ffffffff11a3160 RSI: 0000000000000001 RDI: ffffffff88d18b00 [ 33.714364] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 33.721610] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 33.728857] R13: ffffffff88c07c78 R14: ffffffff897beda0 R15: 0000000000000000 [ 33.736118] default_idle+0xc2/0x440 [ 33.739813] ? __sched_text_end+0x3/0x3 [ 33.743776] ? rcu_idle_enter+0x304/0x460 [ 33.747904] ? rcu_eqs_special_set+0x190/0x190 [ 33.752464] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 33.757111] ? mark_tsc_async_resets+0x20/0x20 [ 33.761672] ? tick_nohz_idle_enter+0x219/0x320 [ 33.766321] arch_cpu_idle+0x10/0x20 [ 33.770018] default_idle_call+0x6d/0x90 [ 33.774066] do_idle+0x395/0x560 [ 33.777413] ? arch_cpu_idle_exit+0x70/0x70 [ 33.781712] ? do_idle+0x19e/0x560 [ 33.785231] cpu_startup_entry+0x104/0x120 [ 33.789444] ? cpu_in_idle+0x20/0x20 [ 33.793136] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.798130] ? trace_hardirqs_on+0xd/0x10 [ 33.802257] rest_init+0xe1/0xe4 [ 33.805617] start_kernel+0x906/0x92d [ 33.809394] ? mem_encrypt_init+0xb/0xb [ 33.813346] ? early_idt_handler_common+0x3b/0x60 [ 33.818170] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.823682] ? x86_family+0x3e/0x50 [ 33.827297] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.832812] x86_64_start_reservations+0x29/0x2b [ 33.837545] x86_64_start_kernel+0x76/0x79 [ 33.841759] secondary_startup_64+0xa5/0xb0 [ 33.846089] random: crng init done