[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.239' (ECDSA) to the list of known hosts. 2020/05/30 16:25:14 fuzzer started 2020/05/30 16:25:15 dialing manager at 10.128.0.105:36125 2020/05/30 16:25:23 syscalls: 3055 2020/05/30 16:25:23 code coverage: enabled 2020/05/30 16:25:23 comparison tracing: enabled 2020/05/30 16:25:23 extra coverage: enabled 2020/05/30 16:25:23 setuid sandbox: enabled 2020/05/30 16:25:23 namespace sandbox: enabled 2020/05/30 16:25:23 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/30 16:25:23 fault injection: enabled 2020/05/30 16:25:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/30 16:25:23 net packet injection: enabled 2020/05/30 16:25:23 net device setup: enabled 2020/05/30 16:25:23 concurrency sanitizer: enabled 2020/05/30 16:25:23 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/30 16:25:23 USB emulation: enabled 2020/05/30 16:25:26 adding functions to KCSAN blacklist: 'do_wait' 'ep_poll' 'futex_wait_queue_me' 'page_counter_charge' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'tick_nohz_idle_stop_tick' 'xas_clear_mark' '__add_to_page_cache_locked' 'run_timer_softirq' 'tick_nohz_next_event' '__writeback_single_inode' 'generic_write_end' 'do_syslog' '__x64_sys_ptrace' 'find_get_pages_range_tag' 'blk_mq_dispatch_rq_list' '__ext4_new_inode' 'echo_char' '__get_user_pages' 'ktime_get_real_seconds' 'copy_process' 'do_exit' 'generic_fillattr' 'decrypt_packet' 'kauditd_thread' 'mod_timer' 'pcpu_alloc' syzkaller login: [ 140.951358][ C0] ================================================================== [ 140.959582][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 140.967615][ C0] [ 140.969921][ C0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 140.977527][ C0] tick_sched_do_timer+0xb4/0xd0 [ 140.982454][ C0] tick_sched_timer+0x3f/0xd0 [ 140.987120][ C0] __hrtimer_run_queues+0x271/0x600 [ 140.992293][ C0] hrtimer_interrupt+0x226/0x490 [ 140.997210][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 141.002641][ C0] apic_timer_interrupt+0xf/0x20 [ 141.007575][ C0] tick_nohz_idle_exit+0x128/0x1d0 [ 141.012659][ C0] do_idle+0xac/0x290 [ 141.016632][ C0] cpu_startup_entry+0x14/0x20 [ 141.021371][ C0] start_secondary+0x169/0x1b0 [ 141.026110][ C0] secondary_startup_64+0xa4/0xb0 [ 141.031101][ C0] [ 141.033416][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 141.040933][ C0] tick_sched_do_timer+0x2e/0xd0 [ 141.045844][ C0] tick_sched_timer+0x3f/0xd0 [ 141.050506][ C0] __hrtimer_run_queues+0x271/0x600 [ 141.055685][ C0] hrtimer_interrupt+0x226/0x490 [ 141.060631][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 141.066063][ C0] apic_timer_interrupt+0xf/0x20 [ 141.070978][ C0] __sanitizer_cov_trace_pc+0x9/0x50 [ 141.076237][ C0] tcp_v4_rcv+0x4a/0x1e10 [ 141.080541][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 141.085885][ C0] ip_local_deliver_finish+0xf3/0x120 [ 141.091402][ C0] ip_local_deliver+0x135/0x220 [ 141.096231][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 141.101402][ C0] ip_sublist_rcv+0x3f8/0x530 [ 141.106067][ C0] ip_list_rcv+0x2f3/0x321 [ 141.110485][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 141.116440][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 141.122565][ C0] gro_normal_list.part.0+0x37/0xa0 [ 141.127738][ C0] gro_normal_one+0x14c/0x160 [ 141.132388][ C0] napi_gro_receive+0x27d/0x2f0 [ 141.137212][ C0] receive_buf+0x24c/0x3420 [ 141.141688][ C0] virtnet_poll+0x343/0x790 [ 141.146179][ C0] net_rx_action+0x3ad/0xac0 [ 141.150759][ C0] __do_softirq+0x118/0x34a [ 141.155243][ C0] run_ksoftirqd+0x41/0x60 [ 141.159653][ C0] smpboot_thread_fn+0x374/0x4a0 [ 141.164613][ C0] kthread+0x203/0x230 [ 141.168655][ C0] ret_from_fork+0x1f/0x30 [ 141.173040][ C0] [ 141.175342][ C0] Reported by Kernel Concurrency Sanitizer on: [ 141.181473][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 141.189505][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 141.199533][ C0] ================================================================== [ 141.207565][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 141.214126][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 141.222163][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 141.232204][ C0] Call Trace: [ 141.235471][ C0] [ 141.238330][ C0] dump_stack+0x11d/0x187 [ 141.242661][ C0] panic+0x210/0x640 [ 141.246536][ C0] ? vprintk_func+0x89/0x13a [ 141.251103][ C0] kcsan_report.cold+0xc/0x1a [ 141.255759][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 141.261109][ C0] tick_sched_do_timer+0x2e/0xd0 [ 141.266063][ C0] tick_sched_timer+0x3f/0xd0 [ 141.270730][ C0] __hrtimer_run_queues+0x271/0x600 [ 141.275913][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 141.281016][ C0] hrtimer_interrupt+0x226/0x490 [ 141.285930][ C0] ? kvm_clock_read+0x14/0x30 [ 141.290602][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 141.296035][ C0] apic_timer_interrupt+0xf/0x20 [ 141.300939][ C0] [ 141.303855][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x50 [ 141.309916][ C0] Code: cc 65 48 8b 04 25 40 8c 01 00 48 8b 80 68 0a 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 65 48 8b 04 25 40 8c 01 00 <65> 8b 15 38 ee ba 7e 81 e2 00 01 1f 00 48 8b 34 24 75 2b 8b 90 50 [ 141.329509][ C0] RSP: 0018:ffffc90000cb3680 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 141.337894][ C0] RAX: ffff88812b783000 RBX: ffffffff87579c80 RCX: ffffffff88af0520 [ 141.345839][ C0] RDX: 0000000000000100 RSI: ffffffff85222379 RDI: ffffffff851b196b [ 141.353785][ C0] RBP: ffff888121425f00 R08: 0000000000000000 R09: 0000ffff87579c90 [ 141.361733][ C0] R10: 0000ffff87579ca0 R11: 0000ffff87579c97 R12: ffff888121425f10 [ 141.369690][ C0] R13: ffff888121425fb4 R14: ffff888121425f00 R15: 00000000000000b2 [ 141.377677][ C0] ? tcp_v4_rcv+0x39/0x1e10 [ 141.382157][ C0] ? ip_protocol_deliver_rcu+0x4b/0x410 [ 141.387678][ C0] tcp_v4_rcv+0x4a/0x1e10 [ 141.391988][ C0] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 141.397857][ C0] ? __read_once_size+0x2f/0xd0 [ 141.402685][ C0] ? raw_local_deliver+0x4a4/0x5a4 [ 141.407775][ C0] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 141.413698][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 141.419133][ C0] ip_local_deliver_finish+0xf3/0x120 [ 141.424478][ C0] ip_local_deliver+0x135/0x220 [ 141.429305][ C0] ? ip_protocol_deliver_rcu+0x410/0x410 [ 141.434952][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 141.440126][ C0] ip_sublist_rcv+0x3f8/0x530 [ 141.444786][ C0] ? ip_sublist_rcv+0x530/0x530 [ 141.449616][ C0] ip_list_rcv+0x2f3/0x321 [ 141.454007][ C0] ? ip_rcv+0x1b0/0x1b0 [ 141.458140][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 141.464096][ C0] ? ktime_get_with_offset+0x1e6/0x230 [ 141.469532][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 141.475665][ C0] gro_normal_list.part.0+0x37/0xa0 [ 141.480854][ C0] ? __write_once_size+0x7c/0x100 [ 141.485851][ C0] gro_normal_one+0x14c/0x160 [ 141.490502][ C0] napi_gro_receive+0x27d/0x2f0 [ 141.495329][ C0] receive_buf+0x24c/0x3420 [ 141.499813][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0 [ 141.505248][ C0] virtnet_poll+0x343/0x790 [ 141.509734][ C0] net_rx_action+0x3ad/0xac0 [ 141.514308][ C0] __do_softirq+0x118/0x34a [ 141.518788][ C0] ? takeover_tasklets+0x240/0x240 [ 141.523874][ C0] run_ksoftirqd+0x41/0x60 [ 141.528286][ C0] smpboot_thread_fn+0x374/0x4a0 [ 141.533213][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 141.539180][ C0] kthread+0x203/0x230 [ 141.543243][ C0] ? kthread_unpark+0xd0/0xd0 [ 141.547894][ C0] ret_from_fork+0x1f/0x30 [ 141.553581][ C0] Kernel Offset: disabled [ 141.557895][ C0] Rebooting in 86400 seconds..