[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.854165] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.248831] random: sshd: uninitialized urandom read (32 bytes read) [ 23.519177] random: sshd: uninitialized urandom read (32 bytes read) [ 24.223456] random: sshd: uninitialized urandom read (32 bytes read) [ 42.648962] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 48.113068] random: sshd: uninitialized urandom read (32 bytes read) [ 53.050922] [ 53.052570] ================================ [ 53.056945] WARNING: inconsistent lock state [ 53.061331] 4.17.0-rc2+ #14 Not tainted [ 53.065305] -------------------------------- [ 53.069784] inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. [ 53.075904] swapper/0/0 [HC1[1]:SC0[0]:HE0:SE1] takes: [ 53.081152] (ptrval) (fs_reclaim){?.+.}, at: fs_reclaim_acquire.part.82+0x0/0x30 [ 53.089378] {HARDIRQ-ON-W} state was registered at: [ 53.094373] lock_acquire+0x1dc/0x520 [ 53.098236] fs_reclaim_acquire.part.82+0x24/0x30 [ 53.103135] fs_reclaim_acquire+0x14/0x20 [ 53.107342] kmem_cache_alloc_node_trace+0x39/0x770 [ 53.112420] alloc_worker+0xbd/0x2e0 [ 53.116196] init_rescuer.part.25+0x1f/0x190 [ 53.120668] workqueue_init+0x51f/0x7d0 [ 53.124704] kernel_init_freeable+0x2ad/0x58e [ 53.129268] kernel_init+0x11/0x1b3 [ 53.132962] ret_from_fork+0x3a/0x50 [ 53.136732] irq event stamp: 391560 [ 53.140339] hardirqs last enabled at (391557): [] default_idle+0x8d/0x440 [ 53.148897] hardirqs last disabled at (391558): [] interrupt_entry+0xb5/0xf0 [ 53.157632] softirqs last enabled at (391560): [] _local_bh_enable+0x1c/0x30 [ 53.166443] softirqs last disabled at (391559): [] irq_enter+0xa0/0xd0 [ 53.174648] [ 53.174648] other info that might help us debug this: [ 53.181284] Possible unsafe locking scenario: [ 53.181284] [ 53.187327] CPU0 [ 53.189880] ---- [ 53.192433] lock(fs_reclaim); [ 53.195683] [ 53.198410] lock(fs_reclaim); [ 53.201833] [ 53.201833] *** DEADLOCK *** [ 53.201833] [ 53.207865] no locks held by swapper/0/0. [ 53.211981] [ 53.211981] stack backtrace: [ 53.216460] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc2+ #14 [ 53.223011] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.232337] Call Trace: [ 53.234891] [ 53.237024] dump_stack+0x1b9/0x294 [ 53.240626] ? dump_stack_print_info.cold.2+0x52/0x52 [ 53.245790] ? vprintk_func+0x81/0xe7 [ 53.249565] print_usage_bug.cold.59+0x320/0x41a [ 53.254307] ? save_stack_trace+0x1a/0x20 [ 53.258436] mark_lock+0x1034/0x19e0 [ 53.262132] ? check_usage_backwards+0x3a0/0x3a0 [ 53.266870] ? print_usage_bug+0xc0/0xc0 [ 53.270912] ? save_trace+0xe0/0x290 [ 53.274602] ? print_usage_bug+0xc0/0xc0 [ 53.278635] ? mark_lock+0xafe/0x19e0 [ 53.282409] ? check_usage_backwards+0x3a0/0x3a0 [ 53.287140] ? print_usage_bug+0xc0/0xc0 [ 53.291174] ? scsi_mq_uninit_cmd+0x30/0x30 [ 53.295470] __lock_acquire+0x1595/0x5140 [ 53.299590] ? __lock_acquire+0x7f5/0x5140 [ 53.303796] ? find_held_lock+0x36/0x1c0 [ 53.307833] ? debug_check_no_locks_freed+0x310/0x310 [ 53.312994] ? debug_check_no_locks_freed+0x310/0x310 [ 53.318157] ? debug_check_no_locks_freed+0x310/0x310 [ 53.323320] ? lock_downgrade+0x8e0/0x8e0 [ 53.327445] ? sha_transform+0x26/0x4449 [ 53.331489] ? kasan_check_read+0x11/0x20 [ 53.335609] ? do_raw_spin_unlock+0x9e/0x2e0 [ 53.340000] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 53.344555] ? memset+0x31/0x40 [ 53.347810] ? memzero_explicit+0xe/0x10 [ 53.351846] ? extract_buf+0x3a3/0x4c0 [ 53.355709] ? graph_lock+0x170/0x170 [ 53.359482] ? crng_fast_load+0x3b0/0x3b0 [ 53.363602] ? graph_lock+0x170/0x170 [ 53.367377] ? account.constprop.30+0x34e/0x700 [ 53.372027] lock_acquire+0x1dc/0x520 [ 53.375807] ? bad_range+0x160/0x160 [ 53.379494] ? lock_release+0xa10/0xa10 [ 53.383441] ? lock_downgrade+0x8e0/0x8e0 [ 53.387561] ? lock_release+0xa10/0xa10 [ 53.391508] ? lock_downgrade+0x8e0/0x8e0 [ 53.395630] fs_reclaim_acquire.part.82+0x24/0x30 [ 53.400444] ? bad_range+0x160/0x160 [ 53.404130] fs_reclaim_acquire+0x14/0x20 [ 53.408249] __kmalloc+0x45/0x760 [ 53.411676] ? trace_hardirqs_off+0xd/0x10 [ 53.415887] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 53.421059] ? crng_reseed+0x427/0x920 [ 53.424919] crng_reseed+0x427/0x920 [ 53.428606] ? _extract_entropy.constprop.32+0x150/0x150 [ 53.434030] ? kasan_check_read+0x11/0x20 [ 53.438153] ? rcu_is_watching+0x85/0x140 [ 53.442275] ? rcu_pm_notify+0xc0/0xc0 [ 53.446146] credit_entropy_bits+0x98d/0xa30 [ 53.450530] ? add_interrupt_randomness+0x494/0x860 [ 53.455549] ? crng_reseed+0x920/0x920 [ 53.459412] ? lock_downgrade+0x8e0/0x8e0 [ 53.463533] ? __mix_pool_bytes+0xde/0x400 [ 53.467741] ? kasan_check_read+0x11/0x20 [ 53.471863] ? do_raw_spin_unlock+0x9e/0x2e0 [ 53.476249] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 53.480805] ? __handle_irq_event_percpu+0x34d/0xad0 [ 53.485882] add_interrupt_randomness+0x494/0x860 [ 53.490698] ? extract_entropy.constprop.29+0x490/0x490 [ 53.496035] ? lock_downgrade+0x8e0/0x8e0 [ 53.500157] ? handle_edge_irq+0x30/0x870 [ 53.504278] handle_irq_event_percpu+0xf9/0x1c0 [ 53.508919] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 53.513473] ? __handle_irq_event_percpu+0xad0/0xad0 [ 53.518549] ? ktime_get+0x2d9/0x430 [ 53.522240] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.527750] handle_irq_event+0xa7/0x135 [ 53.531785] handle_edge_irq+0x20f/0x870 [ 53.535820] handle_irq+0x18c/0x2e7 [ 53.539435] ? __local_bh_enable+0xef/0x130 [ 53.543732] do_IRQ+0x78/0x190 [ 53.546901] common_interrupt+0xf/0xf [ 53.550669] [ 53.552880] RIP: 0010:native_safe_halt+0x6/0x10 [ 53.557526] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 53.565209] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 53.572452] RDX: 1ffffffff11a3160 RSI: 0000000000000001 RDI: ffffffff88d18b00 [ 53.579694] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 53.586936] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 53.594179] R13: ffffffff88c07c78 R14: ffffffff897beda0 R15: 0000000000000000 [ 53.601428] default_idle+0xc2/0x440 [ 53.605115] ? __sched_text_end+0x3/0x3 [ 53.609065] ? rcu_idle_enter+0x304/0x460 [ 53.613187] ? rcu_eqs_special_set+0x190/0x190 [ 53.617742] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 53.622386] ? mark_tsc_async_resets+0x20/0x20 [ 53.626941] ? tick_nohz_idle_enter+0x219/0x320 [ 53.631586] arch_cpu_idle+0x10/0x20 [ 53.635272] default_idle_call+0x6d/0x90 [ 53.639307] do_idle+0x395/0x560 [ 53.642650] ? arch_cpu_idle_exit+0x70/0x70 [ 53.646946] cpu_startup_entry+0x104/0x120 [ 53.651152] ? cpu_in_idle+0x20/0x20 [ 53.654841] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.659832] ? trace_hardirqs_on+0xd/0x10 [ 53.663954] rest_init+0xe1/0xe4 [ 53.667300] start_kernel+0x906/0x92d [ 53.671078] ? mem_encrypt_init+0xb/0xb [ 53.675025] ? early_idt_handler_common+0x3b/0x60 [ 53.679843] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.685353] ? x86_family+0x3e/0x50 [ 53.688954] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.694467] x86_64_start_reservations+0x29/0x2b [ 53.699195] x86_64_start_kernel+0x76/0x79 [ 53.703403] secondary_startup_64+0xa5/0xb0 [ 53.707702] BUG: sleeping function called from invalid context at mm/slab.h:421 [ 53.715122] in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/0 [ 53.721841] INFO: lockdep is turned off. [ 53.725881] irq event stamp: 391560 [ 53.729485] hardirqs last enabled at (391557): [] default_idle+0x8d/0x440 [ 53.738039] hardirqs last disabled at (391558): [] interrupt_entry+0xb5/0xf0 [ 53.746764] softirqs last enabled at (391560): [] _local_bh_enable+0x1c/0x30 [ 53.755574] softirqs last disabled at (391559): [] irq_enter+0xa0/0xd0 [ 53.763790] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc2+ #14 [ 53.770340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.779667] Call Trace: [ 53.782222] [ 53.784351] dump_stack+0x1b9/0x294 [ 53.787954] ? dump_stack_print_info.cold.2+0x52/0x52 [ 53.793118] ? fs_reclaim_acquire+0x20/0x20 [ 53.797414] ? irq_enter+0xa0/0xd0 [ 53.800928] ? irq_enter+0xa0/0xd0 [ 53.804446] ___might_sleep.cold.87+0x11f/0x13a [ 53.809087] ? check_same_owner+0x320/0x320 [ 53.813393] ? lock_release+0xa10/0xa10 [ 53.817341] __might_sleep+0x95/0x190 [ 53.821118] __kmalloc+0x2b9/0x760 [ 53.824631] ? trace_hardirqs_off+0xd/0x10 [ 53.828844] ? _raw_write_unlock_irqrestore+0x63/0xc0 [ 53.834009] ? crng_reseed+0x427/0x920 [ 53.837870] crng_reseed+0x427/0x920 [ 53.841569] ? _extract_entropy.constprop.32+0x150/0x150 [ 53.846997] ? kasan_check_read+0x11/0x20 [ 53.851127] ? rcu_is_watching+0x85/0x140 [ 53.855248] ? rcu_pm_notify+0xc0/0xc0 [ 53.859115] credit_entropy_bits+0x98d/0xa30 [ 53.863501] ? add_interrupt_randomness+0x494/0x860 [ 53.868492] ? crng_reseed+0x920/0x920 [ 53.872355] ? lock_downgrade+0x8e0/0x8e0 [ 53.876479] ? __mix_pool_bytes+0xde/0x400 [ 53.880691] ? kasan_check_read+0x11/0x20 [ 53.884813] ? do_raw_spin_unlock+0x9e/0x2e0 [ 53.889195] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 53.893755] ? __handle_irq_event_percpu+0x34d/0xad0 [ 53.898834] add_interrupt_randomness+0x494/0x860 [ 53.903650] ? extract_entropy.constprop.29+0x490/0x490 [ 53.908990] ? lock_downgrade+0x8e0/0x8e0 [ 53.913114] ? handle_edge_irq+0x30/0x870 [ 53.917237] handle_irq_event_percpu+0xf9/0x1c0 [ 53.921878] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 53.926435] ? __handle_irq_event_percpu+0xad0/0xad0 [ 53.931515] ? ktime_get+0x2d9/0x430 [ 53.935207] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.940718] handle_irq_event+0xa7/0x135 [ 53.944752] handle_edge_irq+0x20f/0x870 [ 53.948787] handle_irq+0x18c/0x2e7 [ 53.952389] ? __local_bh_enable+0xef/0x130 [ 53.956684] do_IRQ+0x78/0x190 [ 53.959850] common_interrupt+0xf/0xf [ 53.963630] [ 53.965844] RIP: 0010:native_safe_halt+0x6/0x10 [ 53.970483] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 53.978165] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 53.985417] RDX: 1ffffffff11a3160 RSI: 0000000000000001 RDI: ffffffff88d18b00 [ 53.992667] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 53.999920] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 54.007168] R13: ffffffff88c07c78 R14: ffffffff897beda0 R15: 0000000000000000 [ 54.014420] default_idle+0xc2/0x440 [ 54.018109] ? __sched_text_end+0x3/0x3 [ 54.022057] ? rcu_idle_enter+0x304/0x460 [ 54.026181] ? rcu_eqs_special_set+0x190/0x190 [ 54.030736] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 54.035381] ? mark_tsc_async_resets+0x20/0x20 [ 54.039939] ? tick_nohz_idle_enter+0x219/0x320 [ 54.044583] arch_cpu_idle+0x10/0x20 [ 54.048276] default_idle_call+0x6d/0x90 [ 54.052312] do_idle+0x395/0x560 [ 54.055657] ? arch_cpu_idle_exit+0x70/0x70 [ 54.059955] cpu_startup_entry+0x104/0x120 [ 54.064165] ? cpu_in_idle+0x20/0x20 [ 54.067853] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 54.072842] ? trace_hardirqs_on+0xd/0x10 [ 54.076965] rest_init+0xe1/0xe4 [ 54.080307] start_kernel+0x906/0x92d [ 54.084081] ? mem_encrypt_init+0xb/0xb [ 54.088029] ? early_idt_handler_common+0x3b/0x60 [ 54.092859] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.098370] ? x86_family+0x3e/0x50 [ 54.101972] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.107482] x86_64_start_reservations+0x29/0x2b [ 54.112213] x86_64_start_kernel+0x76/0x79 [ 54.116423] secondary_startup_64+0xa5/0xb0 [ 54.120757] random: crng init done