[ 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 '10.128.0.62' (ECDSA) to the list of known hosts. 2020/05/16 03:37:34 fuzzer started 2020/05/16 03:37:34 dialing manager at 10.128.0.105:43791 2020/05/16 03:38:02 syscalls: 3055 2020/05/16 03:38:02 code coverage: enabled 2020/05/16 03:38:02 comparison tracing: enabled 2020/05/16 03:38:02 extra coverage: enabled 2020/05/16 03:38:02 setuid sandbox: enabled 2020/05/16 03:38:02 namespace sandbox: enabled 2020/05/16 03:38:02 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/16 03:38:02 fault injection: enabled 2020/05/16 03:38:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/16 03:38:02 net packet injection: enabled 2020/05/16 03:38:02 net device setup: enabled 2020/05/16 03:38:02 concurrency sanitizer: enabled 2020/05/16 03:38:02 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/16 03:38:02 USB emulation: enabled syzkaller login: [ 79.998430][ T8933] KCSAN: could not find function: '_find_next_bit' 2020/05/16 03:38:07 adding functions to KCSAN blacklist: 'do_nanosleep' 'blk_mq_request_bypass_insert' 'kcm_rfree' 'mod_timer' 'xas_clear_mark' 'run_timer_softirq' 'n_tty_receive_buf_common' 'shmem_file_read_iter' 'ext4_mark_iloc_dirty' 'copy_process' '_find_next_bit' 'blk_mq_sched_dispatch_requests' 'alloc_pid' '__snd_rawmidi_transmit_ack' 'tick_sched_do_timer' 'ep_poll' 'add_timer' 'blk_mq_get_request' '__delete_from_page_cache' 'wbt_done' 'kauditd_thread' '__ext4_new_inode' 'find_get_pages_range_tag' 'echo_char' 'page_counter_charge' 'generic_write_end' 'do_signal_stop' 'ext4_free_inodes_count' 'dd_has_work' 'generic_fillattr' [ 246.133516][ T0] ================================================================== [ 246.141901][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 246.150473][ T0] [ 246.152801][ T0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 246.160264][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 246.165813][ T0] do_idle+0x1ad/0x290 [ 246.169887][ T0] cpu_startup_entry+0x14/0x20 [ 246.174650][ T0] rest_init+0xe4/0xeb [ 246.178728][ T0] arch_call_rest_init+0x13/0x2b [ 246.183663][ T0] start_kernel+0x7fe/0x823 [ 246.188173][ T0] secondary_startup_64+0xa4/0xb0 [ 246.193271][ T0] [ 246.195603][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 246.203029][ T0] tick_nohz_next_event+0x181/0x340 [ 246.208842][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 246.214395][ T0] do_idle+0x1ad/0x290 [ 246.218553][ T0] cpu_startup_entry+0x14/0x20 [ 246.225867][ T0] start_secondary+0x169/0x1b0 [ 246.230654][ T0] secondary_startup_64+0xa4/0xb0 [ 246.235760][ T0] [ 246.238082][ T0] Reported by Kernel Concurrency Sanitizer on: [ 246.244259][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 246.252145][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 246.262194][ T0] ================================================================== [ 246.270434][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 246.277019][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 246.284901][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 246.294970][ T0] Call Trace: [ 246.298301][ T0] dump_stack+0x11d/0x187 [ 246.302642][ T0] panic+0x210/0x640 [ 246.306632][ T0] ? vprintk_func+0x89/0x13a [ 246.311226][ T0] kcsan_report.cold+0xc/0x1a [ 246.315915][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 246.321307][ T0] tick_nohz_next_event+0x181/0x340 [ 246.326608][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 246.332166][ T0] ? rcu_dynticks_eqs_exit+0x2c/0x60 [ 246.337454][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 246.342942][ T0] do_idle+0x1ad/0x290 [ 246.347033][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 246.352608][ T0] cpu_startup_entry+0x14/0x20 [ 246.357920][ T0] start_secondary+0x169/0x1b0 [ 246.362804][ T0] secondary_startup_64+0xa4/0xb0 [ 246.368588][ T0] Kernel Offset: disabled [ 246.372908][ T0] Rebooting in 86400 seconds..