[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ 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 '10.128.0.59' (ECDSA) to the list of known hosts. 2020/06/15 21:32:30 fuzzer started 2020/06/15 21:32:30 dialing manager at 10.128.0.105:43759 2020/06/15 21:32:38 syscalls: 3085 2020/06/15 21:32:38 code coverage: enabled 2020/06/15 21:32:38 comparison tracing: enabled 2020/06/15 21:32:38 extra coverage: enabled 2020/06/15 21:32:38 setuid sandbox: enabled 2020/06/15 21:32:38 namespace sandbox: enabled 2020/06/15 21:32:38 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/15 21:32:38 fault injection: enabled 2020/06/15 21:32:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/15 21:32:38 net packet injection: enabled 2020/06/15 21:32:38 net device setup: enabled 2020/06/15 21:32:38 concurrency sanitizer: enabled 2020/06/15 21:32:38 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/15 21:32:38 USB emulation: enabled syzkaller login: [ 60.131327][ T8938] KCSAN: could not find function: '_find_next_bit' 2020/06/15 21:32:40 suppressing KCSAN reports in functions: 'blk_mq_get_request' 'do_syslog' 'run_timer_softirq' '__ext4_new_inode' '__send_signal' 'add_timer' 'generic_write_end' 'mod_timer' '_find_next_bit' 'xas_clear_mark' 'do_nanosleep' 'ep_poll' 'file_update_time' 'tick_nohz_next_event' 'kauditd_thread' 'ext4_ext_try_to_merge_right' 'copy_process' 'page_counter_charge' 'n_tty_receive_buf_common' 'ext4_free_inodes_count' 'af_alg_sendpage' [ 77.144410][ T0] ================================================================== [ 77.153133][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 77.162054][ T0] [ 77.164383][ T0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 0: [ 77.171749][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 77.177275][ T0] do_idle+0x1ad/0x290 [ 77.181321][ T0] cpu_startup_entry+0x14/0x20 [ 77.186094][ T0] rest_init+0xe4/0xeb [ 77.190148][ T0] arch_call_rest_init+0x13/0x2b [ 77.195077][ T0] start_kernel+0x7fe/0x823 [ 77.199903][ T0] secondary_startup_64+0xa4/0xb0 [ 77.205070][ T0] [ 77.207383][ T0] read to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 77.214659][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 77.220183][ T0] do_idle+0x1ad/0x290 [ 77.224232][ T0] cpu_startup_entry+0x14/0x20 [ 77.228973][ T0] start_secondary+0x169/0x1b0 [ 77.233726][ T0] secondary_startup_64+0xa4/0xb0 [ 77.238726][ T0] [ 77.241053][ T0] Reported by Kernel Concurrency Sanitizer on: [ 77.247182][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 77.255085][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.265127][ T0] ================================================================== [ 77.273946][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 77.280530][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 77.288392][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.298430][ T0] Call Trace: [ 77.301713][ T0] dump_stack+0x11d/0x187 [ 77.306112][ T0] panic+0x210/0x640 [ 77.309987][ T0] ? vprintk_func+0x89/0x13a [ 77.314556][ T0] kcsan_report.cold+0xc/0x1a [ 77.319215][ T0] kcsan_setup_watchpoint+0x3fb/0x440 [ 77.324579][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 77.330105][ T0] do_idle+0x1ad/0x290 [ 77.334156][ T0] cpu_startup_entry+0x14/0x20 [ 77.338899][ T0] start_secondary+0x169/0x1b0 [ 77.343666][ T0] secondary_startup_64+0xa4/0xb0 [ 77.350185][ T0] Kernel Offset: disabled [ 77.354501][ T0] Rebooting in 86400 seconds..