[ 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 '10.128.0.113' (ECDSA) to the list of known hosts. 2020/12/07 09:29:40 fuzzer started 2020/12/07 09:29:41 dialing manager at 10.128.0.105:38951 2020/12/07 09:29:44 syscalls: 3454 2020/12/07 09:29:44 code coverage: enabled 2020/12/07 09:29:44 comparison tracing: enabled 2020/12/07 09:29:44 extra coverage: enabled 2020/12/07 09:29:44 setuid sandbox: enabled 2020/12/07 09:29:44 namespace sandbox: enabled 2020/12/07 09:29:44 Android sandbox: /sys/fs/selinux/policy does not exist 2020/12/07 09:29:44 fault injection: enabled 2020/12/07 09:29:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/12/07 09:29:44 net packet injection: enabled 2020/12/07 09:29:44 net device setup: enabled 2020/12/07 09:29:44 concurrency sanitizer: enabled 2020/12/07 09:29:44 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/12/07 09:29:44 USB emulation: enabled 2020/12/07 09:29:44 hci packet injection: enabled 2020/12/07 09:29:44 wifi device emulation: enabled 2020/12/07 09:29:46 suppressing KCSAN reports in functions: 'expire_timers' '__ext4_update_other_inode_time' 'dd_has_work' 'blk_mq_rq_ctx_init' 'alloc_pid' 'do_signal_stop' 'generic_write_end' 'isolate_migratepages_block' 'bpf_lru_pop_free' 'kauditd_thread' 'ext4_mb_good_group' '__add_to_page_cache_locked' 'ext4_ext_insert_extent' '__send_signal' 'find_get_pages_range_tag' 'ext4_writepages' '__fsnotify_parent' '__snd_pcm_lib_xfer' 'ext4_free_inode' 'do_select' 'ext4_mb_regular_allocator' '__io_cqring_fill_event' 'xas_clear_mark' 'blk_mq_dispatch_rq_list' 'ext4_ext_try_to_merge_right' 'ext4_free_inodes_count' 'pcpu_alloc' 'generic_file_buffered_read' 'exit_mm' 'ext4_mark_iloc_dirty' 'n_tty_receive_buf_common' '__ext4_new_inode' 'complete_signal' 'blk_mq_sched_dispatch_requests' 'do_sys_poll' '__xa_clear_mark' syzkaller login: [ 55.755192][ T0] ================================================================== [ 55.763474][ T0] BUG: KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer [ 55.771250][ T0] [ 55.773608][ T0] write to 0xffffffff86fc1ad0 of 4 bytes by interrupt on cpu 0: [ 55.781208][ T0] tick_sched_timer+0x1f5/0x210 [ 55.786052][ T0] __run_hrtimer+0x133/0x420 [ 55.790612][ T0] hrtimer_interrupt+0x36e/0xa10 [ 55.795521][ T0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 55.801384][ T0] asm_call_irq_on_stack+0xf/0x20 [ 55.806382][ T0] sysvec_apic_timer_interrupt+0x52/0x90 [ 55.811986][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 55.817954][ T0] acpi_idle_enter+0x25b/0x2e0 [ 55.822698][ T0] cpuidle_enter_state+0x2bd/0x750 [ 55.827808][ T0] cpuidle_enter+0x3c/0x60 [ 55.832203][ T0] do_idle+0x193/0x230 [ 55.836245][ T0] cpu_startup_entry+0x15/0x20 [ 55.840982][ T0] rest_init+0xd7/0xe0 [ 55.845026][ T0] arch_call_rest_init+0xa/0xb [ 55.849778][ T0] start_kernel+0x5a0/0x625 [ 55.854374][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 55.860269][ T0] [ 55.862578][ T0] read to 0xffffffff86fc1ad0 of 4 bytes by task 0 on cpu 1: [ 55.869840][ T0] tick_nohz_stop_tick+0x73/0x410 [ 55.874857][ T0] tick_nohz_idle_stop_tick+0x148/0x2e0 [ 55.880394][ T0] do_idle+0x176/0x230 [ 55.884435][ T0] cpu_startup_entry+0x15/0x20 [ 55.889189][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 55.895051][ T0] [ 55.897361][ T0] Reported by Kernel Concurrency Sanitizer on: [ 55.903489][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc7-syzkaller #0 [ 55.911434][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.921464][ T0] ================================================================== [ 55.929505][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 55.936082][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc7-syzkaller #0 [ 55.944028][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.954066][ T0] Call Trace: [ 55.957349][ T0] dump_stack+0x116/0x15d [ 55.961671][ T0] panic+0x1e7/0x5fa [ 55.965543][ T0] ? vprintk_emit+0x2f2/0x370 [ 55.970208][ T0] kcsan_report+0x67b/0x680 [ 55.974716][ T0] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 55.980446][ T0] ? tick_nohz_stop_tick+0x73/0x410 [ 55.985625][ T0] ? tick_nohz_idle_stop_tick+0x148/0x2e0 [ 55.991324][ T0] ? do_idle+0x176/0x230 [ 55.995542][ T0] ? cpu_startup_entry+0x15/0x20 [ 56.000466][ T0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 56.007640][ T0] ? tick_nohz_next_event+0x2c7/0x300 [ 56.013005][ T0] kcsan_setup_watchpoint+0x46a/0x4d0 [ 56.018353][ T0] tick_nohz_stop_tick+0x73/0x410 [ 56.023377][ T0] tick_nohz_idle_stop_tick+0x148/0x2e0 [ 56.028912][ T0] do_idle+0x176/0x230 [ 56.032954][ T0] cpu_startup_entry+0x15/0x20 [ 56.037694][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 56.044218][ T0] Kernel Offset: disabled [ 56.048533][ T0] Rebooting in 86400 seconds..