[ 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 '10.128.0.197' (ECDSA) to the list of known hosts. 2020/08/11 12:00:16 fuzzer started 2020/08/11 12:00:16 dialing manager at 10.128.0.105:33075 2020/08/11 12:00:19 syscalls: 3272 2020/08/11 12:00:19 code coverage: enabled 2020/08/11 12:00:19 comparison tracing: enabled 2020/08/11 12:00:19 extra coverage: enabled 2020/08/11 12:00:19 setuid sandbox: enabled 2020/08/11 12:00:19 namespace sandbox: enabled 2020/08/11 12:00:19 Android sandbox: /sys/fs/selinux/policy does not exist 2020/08/11 12:00:19 fault injection: enabled 2020/08/11 12:00:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/08/11 12:00:19 net packet injection: enabled 2020/08/11 12:00:19 net device setup: enabled 2020/08/11 12:00:19 concurrency sanitizer: enabled 2020/08/11 12:00:19 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/08/11 12:00:19 USB emulation: enabled 2020/08/11 12:00:19 hci packet injection: enabled 2020/08/11 12:00:21 suppressing KCSAN reports in functions: '__mod_timer' 'generic_write_end' '__xa_clear_mark' 'n_tty_receive_buf_common' 'ext4_mark_iloc_dirty' 'pcpu_alloc' 'wbt_issue' 'do_syslog' 'kauditd_thread' 'futex_wait_queue_me' 'ext4_free_inodes_count' 'ext4_free_inode' '__delayacct_blkio_end' 'do_nanosleep' 'shmem_getpage_gfp' 'find_get_pages_range_tag' '__io_cqring_fill_event' 'expire_timers' 'blk_mq_sched_dispatch_requests' 'alloc_pid' '__ext4_new_inode' '__dentry_kill' 'page_counter_charge' 'snd_rawmidi_poll' 'blk_mq_rq_ctx_init' 'blk_mq_dispatch_rq_list' 'do_sys_poll' 'do_signal_stop' '__add_to_page_cache_locked' syzkaller login: [ 69.933653][ T0] ================================================================== [ 69.941760][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 69.949625][ T0] [ 69.951940][ T0] write to 0xffffffff87f62e50 of 4 bytes by interrupt on cpu 0: [ 69.959555][ T0] tick_sched_timer+0x214/0x230 [ 69.964390][ T0] __run_hrtimer+0x154/0x4b0 [ 69.968963][ T0] hrtimer_interrupt+0x37c/0xa40 [ 69.973894][ T0] __sysvec_apic_timer_interrupt+0xa3/0x280 [ 69.979770][ T0] asm_call_on_stack+0xf/0x20 [ 69.984433][ T0] sysvec_apic_timer_interrupt+0x80/0xd0 [ 69.990055][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 69.996012][ T0] loop1+0x181/0x892 [ 69.999877][ T0] [ 70.002192][ T0] read to 0xffffffff87f62e50 of 4 bytes by task 0 on cpu 1: [ 70.009460][ T0] tick_nohz_next_event+0x21d/0x310 [ 70.014645][ T0] tick_nohz_get_sleep_length+0xca/0x140 [ 70.020258][ T0] menu_select+0x328/0x1030 [ 70.024745][ T0] cpuidle_select+0x3d/0x50 [ 70.029228][ T0] do_idle+0x1eb/0x310 [ 70.033274][ T0] cpu_startup_entry+0x15/0x20 [ 70.038022][ T0] secondary_startup_64+0xa4/0xb0 [ 70.043021][ T0] [ 70.045335][ T0] Reported by Kernel Concurrency Sanitizer on: [ 70.051469][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.8.0-syzkaller #0 [ 70.058986][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.069017][ T0] ================================================================== [ 70.077056][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 70.083629][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.8.0-syzkaller #0 [ 70.091152][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.101191][ T0] Call Trace: [ 70.104467][ T0] dump_stack+0x10f/0x19d [ 70.108778][ T0] panic+0x207/0x64a [ 70.112658][ T0] ? vprintk_emit+0x44a/0x4f0 [ 70.117326][ T0] kcsan_report+0x684/0x690 [ 70.121819][ T0] ? kcsan_setup_watchpoint+0x41e/0x4a0 [ 70.127355][ T0] ? tick_nohz_next_event+0x21d/0x310 [ 70.132713][ T0] ? tick_nohz_get_sleep_length+0xca/0x140 [ 70.138505][ T0] ? menu_select+0x328/0x1030 [ 70.143176][ T0] ? cpuidle_select+0x3d/0x50 [ 70.147844][ T0] ? do_idle+0x1eb/0x310 [ 70.152185][ T0] ? cpu_startup_entry+0x15/0x20 [ 70.157108][ T0] ? secondary_startup_64+0xa4/0xb0 [ 70.162302][ T0] kcsan_setup_watchpoint+0x41e/0x4a0 [ 70.167677][ T0] tick_nohz_next_event+0x21d/0x310 [ 70.172861][ T0] tick_nohz_get_sleep_length+0xca/0x140 [ 70.178474][ T0] menu_select+0x328/0x1030 [ 70.182978][ T0] ? _raw_spin_unlock_irq+0x4b/0x70 [ 70.188178][ T0] cpuidle_select+0x3d/0x50 [ 70.192668][ T0] do_idle+0x1eb/0x310 [ 70.196728][ T0] cpu_startup_entry+0x15/0x20 [ 70.201483][ T0] secondary_startup_64+0xa4/0xb0 [ 70.207647][ T0] Kernel Offset: disabled [ 70.211951][ T0] Rebooting in 86400 seconds..