[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.42' (ECDSA) to the list of known hosts. 2020/06/03 01:31:28 fuzzer started 2020/06/03 01:31:28 dialing manager at 10.128.0.105:34577 2020/06/03 01:31:28 syscalls: 3055 2020/06/03 01:31:28 code coverage: enabled 2020/06/03 01:31:28 comparison tracing: enabled 2020/06/03 01:31:28 extra coverage: enabled 2020/06/03 01:31:28 setuid sandbox: enabled 2020/06/03 01:31:28 namespace sandbox: enabled 2020/06/03 01:31:28 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/03 01:31:28 fault injection: enabled 2020/06/03 01:31:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/03 01:31:28 net packet injection: enabled 2020/06/03 01:31:28 net device setup: enabled 2020/06/03 01:31:28 concurrency sanitizer: enabled 2020/06/03 01:31:28 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/03 01:31:28 USB emulation: enabled syzkaller login: [ 53.518119][ T8923] KCSAN: could not find function: 'poll_schedule_timeout' [ 55.806561][ T8923] KCSAN: could not find function: '_find_next_bit' 2020/06/03 01:31:32 adding functions to KCSAN blacklist: 'run_timer_softirq' 'mod_timer' 'blk_mq_dispatch_rq_list' 'atime_needs_update' 'vm_area_dup' 'generic_fillattr' 'ext4_mb_good_group' 'poll_schedule_timeout' '__mark_inode_dirty' 'kcm_rfree' 'tick_nohz_next_event' 'copy_process' 'page_counter_charge' 'ext4_free_inodes_count' 'xas_clear_mark' 'do_nanosleep' '__ext4_new_inode' 'ep_poll' 'complete_signal' '_find_next_bit' '__get_user_pages' 'find_get_pages_range_tag' 'file_update_time' 'kauditd_thread' 'blk_mq_get_request' 'futex_wait_queue_me' 'generic_write_end' [ 79.698438][ T0] ================================================================== [ 79.706594][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 79.715079][ T0] [ 79.717410][ T0] write to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 79.725044][ T0] tick_sched_do_timer+0xb4/0xd0 [ 79.729995][ T0] tick_sched_timer+0x3f/0xd0 [ 79.734665][ T0] __hrtimer_run_queues+0x271/0x600 [ 79.739858][ T0] hrtimer_interrupt+0x226/0x490 [ 79.744807][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 79.750265][ T0] apic_timer_interrupt+0xf/0x20 [ 79.755210][ T0] __sanitizer_cov_trace_pc+0x22/0x50 [ 79.760583][ T0] __this_cpu_preempt_check+0x3c/0x130 [ 79.766041][ T0] ipt_do_table+0x8b1/0xe70 [ 79.770543][ T0] iptable_filter_hook+0x44/0x60 [ 79.775487][ T0] nf_hook_slow+0x7c/0x160 [ 79.779917][ T0] __ip_local_out+0x1f3/0x2b0 [ 79.784594][ T0] ip_local_out+0x2d/0x90 [ 79.788929][ T0] __ip_queue_xmit+0x3a6/0xa40 [ 79.793689][ T0] ip_queue_xmit+0x3e/0x50 [ 79.798117][ T0] __tcp_transmit_skb+0xe0c/0x1d80 [ 79.803238][ T0] __tcp_send_ack+0x22c/0x2f0 [ 79.807931][ T0] tcp_send_ack+0x2d/0x40 [ 79.812259][ T0] tcp_cleanup_rbuf+0x124/0x340 [ 79.817100][ T0] tcp_recvmsg+0x686/0x1ba0 [ 79.821583][ T0] inet_recvmsg+0xc1/0x250 [ 79.825974][ T0] sock_recvmsg+0x8e/0xb0 [ 79.830275][ T0] sock_read_iter+0x185/0x230 [ 79.834925][ T0] new_sync_read+0x416/0x450 [ 79.839490][ T0] __vfs_read+0x9e/0xb0 [ 79.843647][ T0] vfs_read+0x13e/0x2b0 [ 79.847782][ T0] ksys_read+0x16a/0x1a0 [ 79.851995][ T0] __x64_sys_read+0x49/0x60 [ 79.856483][ T0] do_syscall_64+0xc7/0x3b0 [ 79.861002][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 79.866860][ T0] [ 79.869164][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 79.876444][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 79.881966][ T0] do_idle+0x1ad/0x290 [ 79.886007][ T0] cpu_startup_entry+0x14/0x20 [ 79.890743][ T0] start_secondary+0x169/0x1b0 [ 79.895480][ T0] secondary_startup_64+0xa4/0xb0 [ 79.900470][ T0] [ 79.902768][ T0] Reported by Kernel Concurrency Sanitizer on: [ 79.908909][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 79.916767][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.926796][ T0] ================================================================== [ 79.934829][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 79.941395][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 79.949253][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.959289][ T0] Call Trace: [ 79.962568][ T0] dump_stack+0x11d/0x187 [ 79.966889][ T0] panic+0x210/0x640 [ 79.970771][ T0] ? vprintk_func+0x89/0x13a [ 79.975338][ T0] kcsan_report.cold+0xc/0x1a [ 79.980020][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 79.985381][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 79.990903][ T0] do_idle+0x1ad/0x290 [ 79.994952][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 80.000397][ T0] cpu_startup_entry+0x14/0x20 [ 80.005136][ T0] start_secondary+0x169/0x1b0 [ 80.009894][ T0] secondary_startup_64+0xa4/0xb0 [ 80.015851][ T0] Kernel Offset: disabled [ 80.020164][ T0] Rebooting in 86400 seconds..