[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.458198] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.294103] random: sshd: uninitialized urandom read (32 bytes read) [ 28.622910] random: sshd: uninitialized urandom read (32 bytes read) [ 29.171021] random: sshd: uninitialized urandom read (32 bytes read) [ 36.777479] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. [ 42.264535] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.368005] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. [ 42.384942] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.559601] kasan: CONFIG_KASAN_INLINE enabled [ 42.564474] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.571927] general protection fault: 0000 [#1] SMP KASAN [ 42.577475] CPU: 1 PID: 4474 Comm: syz-executor782 Not tainted 4.18.0-next-20180813+ #37 [ 42.585704] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.595071] RIP: 0010:send_sigurg_to_task+0xf5/0x4d0 [ 42.600187] Code: 61 af b1 ff 45 84 f6 0f 84 52 03 00 00 e8 83 ae b1 ff 49 8d bf 58 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 91 03 00 00 48 8d 43 c0 4d 8b b7 58 06 00 00 48 [ 42.619083] RSP: 0000:ffff8801db106c18 EFLAGS: 00010202 [ 42.624474] RAX: dffffc0000000000 RBX: ffff8801db106c88 RCX: ffffffff81cae2d0 [ 42.631739] RDX: 00000000000000cb RSI: ffffffff81cadf6d RDI: 0000000000000658 [ 42.639011] RBP: ffff8801db106cb0 R08: ffff8801b4ad4640 R09: ffffed003b6246d6 [ 42.646303] R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: 1ffff1003b620d85 [ 42.653580] R13: ffff8801b4cb9388 R14: 0000000000000001 R15: 0000000000000000 [ 42.660866] FS: 0000000000949880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 42.669089] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.674987] CR2: 0000000000400bc3 CR3: 00000001bb122000 CR4: 00000000001406e0 [ 42.682262] Call Trace: [ 42.684843] [ 42.687001] ? pid_task+0x115/0x200 [ 42.690627] ? f_setown+0x240/0x240 [ 42.694264] ? kasan_check_write+0x14/0x20 [ 42.698509] send_sigurg+0x342/0x480 [ 42.702229] ? graph_lock+0x170/0x170 [ 42.706058] ? __lock_acquire+0x7fc/0x5020 [ 42.710297] ? kill_fasync+0x640/0x640 [ 42.714185] ? graph_lock+0x170/0x170 [ 42.717991] ? graph_lock+0x170/0x170 [ 42.721789] ? graph_lock+0x170/0x170 [ 42.725604] sk_send_sigurg+0xd2/0x3d0 [ 42.729487] ? sk_dst_check+0x790/0x790 [ 42.733493] tcp_urg+0x3c3/0xba0 [ 42.736860] ? tcp_xmit_recovery.part.64+0x130/0x130 [ 42.741957] ? sched_clock+0x31/0x40 [ 42.745678] ? sched_clock_cpu+0x1b/0x170 [ 42.749828] tcp_rcv_established+0xd45/0x2130 [ 42.754324] ? tcp_data_queue+0x4690/0x4690 [ 42.758649] ? tcp_v4_rcv+0x2dbf/0x3a90 [ 42.762629] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.767646] ? ipv4_dst_check+0x1d8/0x270 [ 42.771803] ? ipv4_sysctl_rtcache_flush+0xa0/0xa0 [ 42.776748] ? __lock_is_held+0xb5/0x140 [ 42.780836] tcp_v4_do_rcv+0x635/0x8f0 [ 42.784733] tcp_v4_rcv+0x2ff9/0x3a90 [ 42.788540] ? tcp_v4_early_demux+0xb40/0xb40 [ 42.793037] ? __lock_is_held+0xb5/0x140 [ 42.797127] ip_local_deliver_finish+0x2eb/0xda0 [ 42.801886] ? ip_sublist_rcv_finish+0x3e0/0x3e0 [ 42.806655] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.811680] ? nf_hook_slow+0x11e/0x1c0 [ 42.815651] ip_local_deliver+0x1e9/0x750 [ 42.819823] ? ip_call_ra_chain+0x730/0x730 [ 42.824148] ? ip_sublist_rcv_finish+0x3e0/0x3e0 [ 42.828902] ? kasan_check_read+0x11/0x20 [ 42.833056] ? rcu_is_watching+0x8c/0x150 [ 42.837202] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 42.841875] ip_rcv_finish+0x1f9/0x300 [ 42.845765] ip_rcv+0xed/0x610 [ 42.848961] ? print_usage_bug+0xc0/0xc0 [ 42.853020] ? ip_local_deliver+0x750/0x750 [ 42.857341] ? ip_rcv_finish_core.isra.16+0x1f10/0x1f10 [ 42.862701] ? lock_acquire+0x1e4/0x4f0 [ 42.866674] ? process_backlog+0x1a6/0x760 [ 42.870909] __netif_receive_skb_one_core+0x14d/0x200 [ 42.876106] ? __netif_receive_skb_core+0x39f0/0x39f0 [ 42.881307] ? net_rx_action+0x799/0x1900 [ 42.885454] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 42.890170] __netif_receive_skb+0x2c/0x1e0 [ 42.894497] process_backlog+0x219/0x760 [ 42.898573] net_rx_action+0x799/0x1900 [ 42.902572] ? rcu_process_callbacks+0x16e0/0x27c0 [ 42.907543] ? napi_complete_done+0x6d0/0x6d0 [ 42.912047] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.917067] ? mark_held_locks+0xc9/0x160 [ 42.921223] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.925721] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.930223] ? lockdep_hardirqs_on+0x19e/0x5c0 [ 42.934802] ? trace_hardirqs_on+0xbd/0x2c0 [ 42.939130] ? kasan_check_read+0x11/0x20 [ 42.943273] ? __run_timers+0x9c8/0xc60 [ 42.947253] ? trace_hardirqs_off_caller+0x2b0/0x2b0 [ 42.952359] ? kasan_check_write+0x14/0x20 [ 42.956592] ? do_raw_spin_lock+0xc1/0x200 [ 42.960838] ? _raw_spin_unlock_irq+0x27/0x70 [ 42.965344] ? __run_timers+0x9f6/0xc60 [ 42.969333] ? __bpf_trace_timer_expire_entry+0x30/0x30 [ 42.974709] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 42.979724] ? graph_lock+0x170/0x170 [ 42.983540] ? print_usage_bug+0xc0/0xc0 [ 42.987598] ? lock_release+0x9f0/0x9f0 [ 42.991582] ? hrtimer_update_softirq_timer+0xa0/0xa0 [ 42.996770] ? find_held_lock+0x36/0x1c0 [ 43.000831] ? graph_lock+0x170/0x170 [ 43.004651] ? mark_held_locks+0xc9/0x160 [ 43.008794] ? lock_downgrade+0x8f0/0x8f0 [ 43.012959] ? __do_softirq+0x275/0xa6d [ 43.016934] ? __lock_is_held+0xb5/0x140 [ 43.021016] __do_softirq+0x2e8/0xa6d [ 43.024862] ? __irqentry_text_end+0x1f9f98/0x1f9f98 [ 43.030000] ? trace_hardirqs_off+0xb8/0x2b0 [ 43.034425] ? kasan_check_read+0x11/0x20 [ 43.038588] ? graph_lock+0x170/0x170 [ 43.042400] ? native_apic_msr_write+0x5b/0x80 [ 43.046994] ? lapic_next_event+0x5a/0x90 [ 43.051155] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.056706] ? clockevents_program_event+0x140/0x370 [ 43.061811] ? trace_hardirqs_off+0xb8/0x2b0 [ 43.066229] ? trace_hardirqs_on+0x2c0/0x2c0 [ 43.070648] irq_exit+0x1d4/0x210 [ 43.074116] smp_apic_timer_interrupt+0x186/0x690 [ 43.078961] ? smp_call_function_single_interrupt+0x5c0/0x5c0 [ 43.084846] ? interrupt_entry+0xb5/0xf0 [ 43.088905] ? trace_hardirqs_off_caller+0xbb/0x2b0 [ 43.093929] ? trace_hardirqs_off_caller+0xbb/0x2b0 [ 43.098949] ? trace_hardirqs_off+0xb8/0x2b0 [ 43.103361] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.108207] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 43.113220] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 43.118237] ? task_prio+0x50/0x50 [ 43.121781] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.126626] apic_timer_interrupt+0xf/0x20 [ 43.130862] [ 43.133123] RIP: 0010:lock_is_held_type+0x18b/0x210 [ 43.138368] Code: ff df 41 c7 84 24 3c 08 00 00 00 00 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 63 48 83 3d f4 33 93 06 00 74 30 48 89 df 57 9d <0f> 1f 44 00 00 48 83 c4 08 44 89 e8 5b 41 5c 41 5d 5d c3 48 83 c4 [ 43.157782] RSP: 0000:ffff8801c6de7578 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 43.165515] RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 [ 43.173218] RDX: 1ffffffff0fe3665 RSI: 0000000000000000 RDI: 0000000000000286 [ 43.180480] RBP: ffff8801c6de7598 R08: ffffed003b6246d7 R09: ffffed003b6246d6 [ 43.187743] R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801b4ad4640 [ 43.195010] R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000000 [ 43.202315] rcu_read_lock_held+0xa9/0xc0 [ 43.206466] filemap_map_pages+0xdab/0x1990 [ 43.210792] ? find_get_entries_tag+0x1410/0x1410 [ 43.215640] ? print_usage_bug+0xc0/0xc0 [ 43.219708] ? save_stack+0xa9/0xd0 [ 43.223338] ? kasan_check_read+0x11/0x20 [ 43.227486] ? do_raw_spin_unlock+0xa7/0x2f0 [ 43.231898] ? __lock_acquire+0x7fc/0x5020 [ 43.236142] ? mark_held_locks+0x160/0x160 [ 43.240407] ? find_held_lock+0x36/0x1c0 [ 43.244470] ? lock_acquire+0x1e4/0x4f0 [ 43.248467] ? lock_downgrade+0x8f0/0x8f0 [ 43.252616] ? lock_release+0x9f0/0x9f0 [ 43.256593] ? kasan_check_read+0x11/0x20 [ 43.260751] ? pmd_val+0x88/0x100 [ 43.264204] ? add_mm_counter_fast+0xd0/0xd0 [ 43.268626] ? kasan_check_write+0x14/0x20 [ 43.272875] ? do_raw_spin_lock+0xc1/0x200 [ 43.277130] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 43.282804] __handle_mm_fault+0x339c/0x4470 [ 43.287221] ? vmf_insert_mixed_mkwrite+0xa0/0xa0 [ 43.292061] ? graph_lock+0x170/0x170 [ 43.295884] ? lock_downgrade+0x8f0/0x8f0 [ 43.300027] ? handle_mm_fault+0x8c4/0xc80 [ 43.304259] ? handle_mm_fault+0x8c4/0xc80 [ 43.308498] ? rcu_is_watching+0x8c/0x150 [ 43.312658] ? __do_page_fault+0x620/0xe50 [ 43.316898] ? rcu_cleanup_dead_rnp+0x200/0x200 [ 43.321586] handle_mm_fault+0x53e/0xc80 [ 43.325653] ? __handle_mm_fault+0x4470/0x4470 [ 43.330237] ? find_vma+0x34/0x190 [ 43.333782] __do_page_fault+0x620/0xe50 [ 43.337850] ? mm_fault_error+0x380/0x380 [ 43.342005] do_page_fault+0xf6/0x7a4 [ 43.345802] ? trace_hardirqs_on+0x2c0/0x2c0 [ 43.350218] ? vmalloc_sync_all+0x30/0x30 [ 43.354364] ? error_entry+0x70/0xd0 [ 43.358076] ? trace_hardirqs_off_caller+0xbb/0x2b0 [ 43.363116] ? trace_hardirqs_on_caller+0xc0/0x2b0 [ 43.368070] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.372920] ? trace_hardirqs_on_caller+0x2b0/0x2b0 [ 43.377949] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 43.383492] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 43.388519] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.394124] ? prepare_exit_to_usermode+0x291/0x3b0 [ 43.399186] ? page_fault+0x8/0x30 [ 43.402773] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.407620] ? page_fault+0x8/0x30 [ 43.411175] page_fault+0x1e/0x30 [ 43.414637] RIP: 0033:0x400bc3 [ 43.417833] Code: 09 00 00 00 e8 0e 09 04 00 48 c7 05 2b 2b 2d 00 00 00 00 00 48 83 c4 10 e8 fa f1 03 00 85 c0 0f 85 d2 07 00 00 e8 ed f1 03 00 <89> c3 89 c5 85 c0 79 0a bf 01 00 00 00 e8 6b ed 00 00 85 c0 0f 85 [ 43.436738] RSP: 002b:00007ffd6e71ae70 EFLAGS: 00010246 [ 43.442106] RAX: 0000000000000000 RBX: 000000000000116b RCX: 000000000043fe8a [ 43.449371] RDX: 0000001899a3a3ae RSI: 0000000000000000 RDI: 0000000001200011 [ 43.456647] RBP: 000000000000116b R08: 0000000000001149 R09: 0000000000949880 [ 43.463910] R10: 0000000000949b50 R11: 0000000000000246 R12: 000000000000a5e7 [ 43.471181] R13: 00000000004023f0 R14: 0000000000000000 R15: 0000000000000000 [ 43.478457] Modules linked in: [ 43.481653] Dumping ftrace buffer: [ 43.485183] (ftrace buffer empty) [ 43.488957] ---[ end trace b74ebc04d71b9f0f ]--- [ 43.493758] RIP: 0010:send_sigurg_to_task+0xf5/0x4d0 [ 43.498887] Code: 61 af b1 ff 45 84 f6 0f 84 52 03 00 00 e8 83 ae b1 ff 49 8d bf 58 06 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 91 03 00 00 48 8d 43 c0 4d 8b b7 58 06 00 00 48 [ 43.517866] RSP: 0000:ffff8801db106c18 EFLAGS: 00010202 [ 43.523325] RAX: dffffc0000000000 RBX: ffff8801db106c88 RCX: ffffffff81cae2d0 [ 43.530647] RDX: 00000000000000cb RSI: ffffffff81cadf6d RDI: 0000000000000658 [ 43.537943] RBP: ffff8801db106cb0 R08: ffff8801b4ad4640 R09: ffffed003b6246d6 [ 43.545235] R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: 1ffff1003b620d85 [ 43.552566] R13: ffff8801b4cb9388 R14: 0000000000000001 R15: 0000000000000000 [ 43.559889] FS: 0000000000949880(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000 [ 43.568140] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.574040] CR2: 0000000000400bc3 CR3: 00000001bb122000 CR4: 00000000001406e0 [ 43.581336] Kernel panic - not syncing: Fatal exception in interrupt [ 43.588160] Dumping ftrace buffer: [ 43.591705] (ftrace buffer empty) [ 43.595405] Kernel Offset: disabled [ 43.599020] Rebooting in 86400 seconds..