[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.272290] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.745726] random: sshd: uninitialized urandom read (32 bytes read) [ 24.161963] random: sshd: uninitialized urandom read (32 bytes read) [ 24.857906] random: sshd: uninitialized urandom read (32 bytes read) [ 25.014966] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 30.467114] random: sshd: uninitialized urandom read (32 bytes read) [ 34.997829] [ 34.999481] ================================ [ 35.003858] WARNING: inconsistent lock state [ 35.008239] 4.17.0-rc1+ #12 Not tainted [ 35.012184] -------------------------------- [ 35.016561] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. [ 35.022678] swapper/0/0 [HC1[1]:SC0[0]:HE0:SE1] takes: [ 35.027923] (ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire.part.82+0x0/0x30 [ 35.036139] {HARDIRQ-ON-W} state was registered at: [ 35.041133] lock_acquire+0x1dc/0x520 [ 35.044995] fs_reclaim_acquire.part.82+0x24/0x30 [ 35.049896] fs_reclaim_acquire+0x14/0x20 [ 35.054106] kmem_cache_alloc_node_trace+0x39/0x770 [ 35.059181] alloc_worker+0xbd/0x2e0 [ 35.062954] init_rescuer.part.25+0x1f/0x190 [ 35.067425] workqueue_init+0x51f/0x7d0 [ 35.071462] kernel_init_freeable+0x2ad/0x58e [ 35.076018] kernel_init+0x11/0x1b3 [ 35.079703] ret_from_fork+0x3a/0x50 [ 35.083471] irq event stamp: 393358 [ 35.087074] hardirqs last enabled at (393355): [] default_idle+0x8d/0x440 [ 35.095630] hardirqs last disabled at (393356): [] interrupt_entry+0xb5/0xf0 [ 35.104362] softirqs last enabled at (393358): [] _local_bh_enable+0x1c/0x30 [ 35.113185] softirqs last disabled at (393357): [] irq_enter+0xa0/0xd0 [ 35.121395] [ 35.121395] other info that might help us debug this: [ 35.128033] Possible unsafe locking scenario: [ 35.128033] [ 35.134070] CPU0 [ 35.136621] ---- [ 35.139174] lock(fs_reclaim); [ 35.142430] [ 35.145170] lock(fs_reclaim); [ 35.148592] [ 35.148592] *** DEADLOCK *** [ 35.148592] [ 35.154624] no locks held by swapper/0/0. [ 35.158741] [ 35.158741] stack backtrace: [ 35.163215] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc1+ #12 [ 35.169771] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.179094] Call Trace: [ 35.181651] [ 35.183784] dump_stack+0x1b9/0x294 [ 35.187386] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.192556] ? vprintk_func+0x81/0xe7 [ 35.196335] print_usage_bug.cold.59+0x320/0x41a [ 35.201076] ? save_stack_trace+0x1a/0x20 [ 35.205205] mark_lock+0x1034/0x19e0 [ 35.208893] ? check_usage_backwards+0x3a0/0x3a0 [ 35.213622] ? print_usage_bug+0xc0/0xc0 [ 35.217657] ? save_trace+0xe0/0x290 [ 35.221350] ? print_usage_bug+0xc0/0xc0 [ 35.225396] ? mark_lock+0xafe/0x19e0 [ 35.229178] ? check_usage_backwards+0x3a0/0x3a0 [ 35.233905] ? print_usage_bug+0xc0/0xc0 [ 35.237939] ? scsi_mq_uninit_cmd+0x30/0x30 [ 35.242234] __lock_acquire+0x1595/0x5140 [ 35.246361] ? __lock_acquire+0x7f5/0x5140 [ 35.250569] ? find_held_lock+0x36/0x1c0 [ 35.254614] ? debug_check_no_locks_freed+0x310/0x310 [ 35.259778] ? debug_check_no_locks_freed+0x310/0x310 [ 35.264943] ? debug_check_no_locks_freed+0x310/0x310 [ 35.270106] ? lock_downgrade+0x8e0/0x8e0 [ 35.274228] ? sha_transform+0x26/0x4449 [ 35.278264] ? kasan_check_read+0x11/0x20 [ 35.282385] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.286766] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.291329] ? memset+0x31/0x40 [ 35.294588] ? memzero_explicit+0xe/0x10 [ 35.298623] ? extract_buf+0x3a3/0x4c0 [ 35.302483] ? graph_lock+0x170/0x170 [ 35.306256] ? crng_fast_load+0x3b0/0x3b0 [ 35.310377] ? graph_lock+0x170/0x170 [ 35.314154] ? account.constprop.30+0x34e/0x700 [ 35.318798] lock_acquire+0x1dc/0x520 [ 35.322572] ? bad_range+0x160/0x160 [ 35.326262] ? lock_release+0xa10/0xa10 [ 35.330210] ? lock_downgrade+0x8e0/0x8e0 [ 35.334330] ? lock_release+0xa10/0xa10 [ 35.338281] ? lock_downgrade+0x8e0/0x8e0 [ 35.342409] fs_reclaim_acquire.part.82+0x24/0x30 [ 35.347226] ? bad_range+0x160/0x160 [ 35.350915] fs_reclaim_acquire+0x14/0x20 [ 35.355038] __kmalloc+0x45/0x760 [ 35.358471] ? trace_hardirqs_off+0xd/0x10 [ 35.362682] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 35.367855] ? crng_reseed+0x427/0x920 [ 35.371719] crng_reseed+0x427/0x920 [ 35.375415] ? _extract_entropy.constprop.32+0x150/0x150 [ 35.380839] ? kasan_check_read+0x11/0x20 [ 35.384961] ? rcu_is_watching+0x85/0x140 [ 35.389083] ? rcu_pm_notify+0xc0/0xc0 [ 35.392948] credit_entropy_bits+0x98d/0xa30 [ 35.397331] ? add_interrupt_randomness+0x494/0x860 [ 35.402326] ? crng_reseed+0x920/0x920 [ 35.406196] ? lock_downgrade+0x8e0/0x8e0 [ 35.410319] ? __mix_pool_bytes+0xde/0x400 [ 35.414530] ? kasan_check_read+0x11/0x20 [ 35.418651] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.423034] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.427591] ? __handle_irq_event_percpu+0x34d/0xad0 [ 35.432680] add_interrupt_randomness+0x494/0x860 [ 35.437503] ? extract_entropy.constprop.29+0x490/0x490 [ 35.442842] ? lock_downgrade+0x8e0/0x8e0 [ 35.446965] ? handle_edge_irq+0x30/0x870 [ 35.451089] ? lock_downgrade+0x8e0/0x8e0 [ 35.455210] handle_irq_event_percpu+0xf9/0x1c0 [ 35.459853] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.464411] ? __handle_irq_event_percpu+0xad0/0xad0 [ 35.469490] ? ktime_get+0x2d9/0x430 [ 35.473182] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.478690] handle_irq_event+0xa7/0x135 [ 35.482728] handle_edge_irq+0x20f/0x870 [ 35.486766] handle_irq+0x18c/0x2e7 [ 35.490372] ? __local_bh_enable+0xef/0x130 [ 35.494671] do_IRQ+0x78/0x190 [ 35.497840] common_interrupt+0xf/0xf [ 35.501608] [ 35.503820] RIP: 0010:native_safe_halt+0x6/0x10 [ 35.508457] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 35.516138] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 35.523384] RDX: 1ffffffff11a3130 RSI: 0000000000000001 RDI: ffffffff88d18980 [ 35.530626] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 35.537868] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 35.545122] R13: ffffffff88c07c78 R14: ffffffff897be9e0 R15: 0000000000000000 [ 35.552376] default_idle+0xc2/0x440 [ 35.556069] ? __sched_text_end+0x3/0x3 [ 35.560019] ? rcu_idle_enter+0x304/0x460 [ 35.564148] ? rcu_eqs_special_set+0x190/0x190 [ 35.568705] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 35.573354] ? mark_tsc_async_resets+0x20/0x20 [ 35.577909] ? tick_nohz_idle_enter+0x219/0x320 [ 35.582554] arch_cpu_idle+0x10/0x20 [ 35.586248] default_idle_call+0x6d/0x90 [ 35.590283] do_idle+0x395/0x560 [ 35.593626] ? arch_cpu_idle_exit+0x70/0x70 [ 35.597923] ? do_idle+0x19e/0x560 [ 35.601436] cpu_startup_entry+0x104/0x120 [ 35.605645] ? cpu_in_idle+0x20/0x20 [ 35.609340] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 35.614333] ? trace_hardirqs_on+0xd/0x10 [ 35.618455] rest_init+0xe1/0xe4 [ 35.621798] start_kernel+0x906/0x92d [ 35.625573] ? mem_encrypt_init+0xb/0xb [ 35.629519] ? early_idt_handler_common+0x3b/0x60 [ 35.634340] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.639850] ? x86_family+0x3e/0x50 [ 35.643454] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 35.648967] x86_64_start_reservations+0x29/0x2b [ 35.653695] x86_64_start_kernel+0x76/0x79 [ 35.657909] secondary_startup_64+0xa5/0xb0 [ 35.662218] BUG: sleeping function called from invalid context at mm/slab.h:421 [ 35.669634] in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/0 [ 35.676355] INFO: lockdep is turned off. [ 35.680389] irq event stamp: 393358 [ 35.683992] hardirqs last enabled at (393355): [] default_idle+0x8d/0x440 [ 35.692547] hardirqs last disabled at (393356): [] interrupt_entry+0xb5/0xf0 [ 35.701274] softirqs last enabled at (393358): [] _local_bh_enable+0x1c/0x30 [ 35.710088] softirqs last disabled at (393357): [] irq_enter+0xa0/0xd0 [ 35.718301] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc1+ #12 [ 35.724851] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.734176] Call Trace: [ 35.736734] [ 35.738863] dump_stack+0x1b9/0x294 [ 35.742465] ? dump_stack_print_info.cold.2+0x52/0x52 [ 35.747629] ? fs_reclaim_acquire+0x20/0x20 [ 35.751925] ? irq_enter+0xa0/0xd0 [ 35.755437] ? irq_enter+0xa0/0xd0 [ 35.758955] ___might_sleep.cold.87+0x11f/0x13a [ 35.763599] ? check_same_owner+0x320/0x320 [ 35.767896] ? lock_release+0xa10/0xa10 [ 35.771853] __might_sleep+0x95/0x190 [ 35.775629] __kmalloc+0x2b9/0x760 [ 35.779144] ? trace_hardirqs_off+0xd/0x10 [ 35.783356] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 35.788520] ? crng_reseed+0x427/0x920 [ 35.792385] crng_reseed+0x427/0x920 [ 35.796083] ? _extract_entropy.constprop.32+0x150/0x150 [ 35.801509] ? kasan_check_read+0x11/0x20 [ 35.805634] ? rcu_is_watching+0x85/0x140 [ 35.809770] ? rcu_pm_notify+0xc0/0xc0 [ 35.813634] credit_entropy_bits+0x98d/0xa30 [ 35.818017] ? add_interrupt_randomness+0x494/0x860 [ 35.823006] ? crng_reseed+0x920/0x920 [ 35.826868] ? lock_downgrade+0x8e0/0x8e0 [ 35.830989] ? __mix_pool_bytes+0xde/0x400 [ 35.835203] ? kasan_check_read+0x11/0x20 [ 35.839335] ? do_raw_spin_unlock+0x9e/0x2e0 [ 35.843725] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.848284] ? __handle_irq_event_percpu+0x34d/0xad0 [ 35.853363] add_interrupt_randomness+0x494/0x860 [ 35.858213] ? extract_entropy.constprop.29+0x490/0x490 [ 35.863564] ? lock_downgrade+0x8e0/0x8e0 [ 35.867696] ? handle_edge_irq+0x30/0x870 [ 35.871819] ? lock_downgrade+0x8e0/0x8e0 [ 35.875943] handle_irq_event_percpu+0xf9/0x1c0 [ 35.880591] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 35.885148] ? __handle_irq_event_percpu+0xad0/0xad0 [ 35.890230] ? ktime_get+0x2d9/0x430 [ 35.893924] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 35.899437] handle_irq_event+0xa7/0x135 [ 35.903478] handle_edge_irq+0x20f/0x870 [ 35.907519] handle_irq+0x18c/0x2e7 [ 35.911124] ? __local_bh_enable+0xef/0x130 [ 35.915425] do_IRQ+0x78/0x190 [ 35.918595] common_interrupt+0xf/0xf [ 35.922372] [ 35.924587] RIP: 0010:native_safe_halt+0x6/0x10 [ 35.929229] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 35.937262] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 35.944510] RDX: 1ffffffff11a3130 RSI: 0000000000000001 RDI: ffffffff88d18980 [ 35.951757] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 35.959002] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 35.966364] R13: ffffffff88c07c78 R14: ffffffff897be9e0 R15: 0000000000000000 [ 35.973623] default_idle+0xc2/0x440 [ 35.977315] ? __sched_text_end+0x3/0x3 [ 35.981268] ? rcu_idle_enter+0x304/0x460 [ 35.985395] ? rcu_eqs_special_set+0x190/0x190 [ 35.989956] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 35.994605] ? mark_tsc_async_resets+0x20/0x20 [ 35.999168] ? tick_nohz_idle_enter+0x219/0x320 [ 36.003816] arch_cpu_idle+0x10/0x20 [ 36.007508] default_idle_call+0x6d/0x90 [ 36.011547] do_idle+0x395/0x560 [ 36.014890] ? arch_cpu_idle_exit+0x70/0x70 [ 36.019188] ? do_idle+0x19e/0x560 [ 36.022716] cpu_startup_entry+0x104/0x120 [ 36.026928] ? cpu_in_idle+0x20/0x20 [ 36.030618] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 36.035611] ? trace_hardirqs_on+0xd/0x10 [ 36.039739] rest_init+0xe1/0xe4 [ 36.043085] start_kernel+0x906/0x92d [ 36.046861] ? mem_encrypt_init+0xb/0xb [ 36.050813] ? early_idt_handler_common+0x3b/0x60 [ 36.055637] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 36.061149] ? x86_family+0x3e/0x50 [ 36.064753] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 36.070267] x86_64_start_reservations+0x29/0x2b [ 36.075000] x86_64_start_kernel+0x76/0x79 [ 36.079215] secondary_startup_64+0xa5/0xb0 [ 36.083567] random: crng init done