[ 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. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts. 2020/06/17 23:39:00 fuzzer started 2020/06/17 23:39:00 dialing manager at 10.128.0.105:41225 2020/06/17 23:39:02 syscalls: 3089 2020/06/17 23:39:02 code coverage: enabled 2020/06/17 23:39:02 comparison tracing: enabled 2020/06/17 23:39:02 extra coverage: enabled 2020/06/17 23:39:02 setuid sandbox: enabled 2020/06/17 23:39:02 namespace sandbox: enabled 2020/06/17 23:39:02 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/17 23:39:02 fault injection: enabled 2020/06/17 23:39:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/17 23:39:02 net packet injection: enabled 2020/06/17 23:39:02 net device setup: enabled 2020/06/17 23:39:02 concurrency sanitizer: enabled 2020/06/17 23:39:02 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/17 23:39:02 USB emulation: enabled syzkaller login: [ 54.360674][ T8923] KCSAN: could not find function: '_find_next_bit' 2020/06/17 23:39:03 suppressing KCSAN reports in functions: 'run_timer_softirq' 'find_get_pages_range_tag' '__delete_from_page_cache' 'generic_write_end' '__ext4_new_inode' '_find_next_bit' 'pcpu_alloc' 'blk_mq_get_request' 'fat12_ent_put' 'generic_file_read_iter' 'ep_poll' [ 58.670481][ T0] ================================================================== [ 58.679704][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 58.687960][ T0] [ 58.690278][ T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 1: [ 58.697913][ T0] tick_sched_do_timer+0xb4/0xd0 [ 58.702846][ T0] tick_sched_timer+0x3f/0xd0 [ 58.707502][ T0] __hrtimer_run_queues+0x271/0x600 [ 58.712680][ T0] hrtimer_interrupt+0x226/0x490 [ 58.717601][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 58.723056][ T0] apic_timer_interrupt+0xf/0x20 [ 58.727973][ T0] kcsan_setup_watchpoint+0x25a/0x440 [ 58.733354][ T0] nf_conntrack_tcp_packet+0x147/0x2fe0 [ 58.738879][ T0] nf_conntrack_in+0x3fe/0xa60 [ 58.743627][ T0] ipv4_conntrack_in+0x23/0x40 [ 58.748380][ T0] nf_hook_slow+0x7c/0x160 [ 58.752780][ T0] nf_hook_slow_list+0x140/0x29f [ 58.757725][ T0] ip_sublist_rcv+0x4f9/0x530 [ 58.762376][ T0] ip_list_rcv+0x2f3/0x321 [ 58.766771][ T0] __netif_receive_skb_list_core+0x368/0x5c0 [ 58.772727][ T0] netif_receive_skb_list_internal+0x5c7/0x810 [ 58.778887][ T0] gro_normal_list.part.0+0x37/0xa0 [ 58.784109][ T0] gro_normal_one+0x14c/0x160 [ 58.788773][ T0] napi_gro_receive+0x27d/0x2f0 [ 58.793769][ T0] receive_buf+0x24c/0x3420 [ 58.798361][ T0] virtnet_poll+0x343/0x790 [ 58.802855][ T0] net_rx_action+0x3ad/0xac0 [ 58.807436][ T0] __do_softirq+0x118/0x34a [ 58.811931][ T0] irq_exit+0xb5/0xd0 [ 58.815902][ T0] do_IRQ+0x7b/0x120 [ 58.819776][ T0] ret_from_intr+0x0/0x21 [ 58.824084][ T0] native_safe_halt+0xe/0x10 [ 58.828647][ T0] default_idle+0x21/0x170 [ 58.833040][ T0] do_idle+0x1b7/0x290 [ 58.837089][ T0] cpu_startup_entry+0x14/0x20 [ 58.841830][ T0] start_secondary+0x169/0x1b0 [ 58.846587][ T0] secondary_startup_64+0xa4/0xb0 [ 58.851582][ T0] [ 58.853890][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 58.861149][ T0] tick_nohz_next_event+0x181/0x340 [ 58.866330][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 58.871852][ T0] do_idle+0x1ad/0x290 [ 58.875897][ T0] cpu_startup_entry+0x14/0x20 [ 58.880647][ T0] rest_init+0xe4/0xeb [ 58.884713][ T0] arch_call_rest_init+0x13/0x2b [ 58.889647][ T0] start_kernel+0x7fe/0x823 [ 58.894143][ T0] secondary_startup_64+0xa4/0xb0 [ 58.899135][ T0] [ 58.901437][ T0] Reported by Kernel Concurrency Sanitizer on: [ 58.907670][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 58.915561][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.925612][ T0] ================================================================== [ 58.933652][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 58.940266][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 58.948140][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.958291][ T0] Call Trace: [ 58.961579][ T0] dump_stack+0x11d/0x187 [ 58.965897][ T0] panic+0x210/0x640 [ 58.969818][ T0] ? vprintk_func+0x89/0x13a [ 58.974412][ T0] kcsan_report.cold+0xc/0x1a [ 58.979074][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 58.984433][ T0] tick_nohz_next_event+0x181/0x340 [ 58.989615][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 58.995138][ T0] ? ktime_get+0x1c9/0x210 [ 58.999533][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 59.005024][ T0] do_idle+0x1ad/0x290 [ 59.009072][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 59.014539][ T0] cpu_startup_entry+0x14/0x20 [ 59.019316][ T0] rest_init+0xe4/0xeb [ 59.023377][ T0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 59.029616][ T0] arch_call_rest_init+0x13/0x2b [ 59.034539][ T0] start_kernel+0x7fe/0x823 [ 59.039028][ T0] secondary_startup_64+0xa4/0xb0 [ 59.044659][ T0] Kernel Offset: disabled [ 59.048975][ T0] Rebooting in 86400 seconds..