[ 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 '10.128.1.5' (ECDSA) to the list of known hosts. 2020/05/10 09:29:51 fuzzer started 2020/05/10 09:29:51 dialing manager at 10.128.0.105:46779 2020/05/10 09:29:51 syscalls: 3055 2020/05/10 09:29:51 code coverage: enabled 2020/05/10 09:29:51 comparison tracing: enabled 2020/05/10 09:29:51 extra coverage: enabled 2020/05/10 09:29:51 setuid sandbox: enabled 2020/05/10 09:29:51 namespace sandbox: enabled 2020/05/10 09:29:51 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/10 09:29:51 fault injection: enabled 2020/05/10 09:29:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/10 09:29:51 net packet injection: enabled 2020/05/10 09:29:51 net device setup: enabled 2020/05/10 09:29:51 concurrency sanitizer: enabled 2020/05/10 09:29:51 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/10 09:29:51 USB emulation: enabled syzkaller login: [ 52.034895][ T8923] KCSAN: could not find function: '_find_next_bit' [ 53.754387][ T8923] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/10 09:29:57 adding functions to KCSAN blacklist: 'echo_char' 'ext4_mark_iloc_dirty' 'page_counter_charge' 'blk_mq_get_request' '__filemap_fdatawrite_range' 'generic_fillattr' 'mod_timer' 'ktime_get_real_seconds' 'add_timer' 'pipe_double_lock' 'dd_has_work' 'ep_insert' 'shmem_file_read_iter' 'kauditd_thread' 'inc_node_page_state' '__delete_from_page_cache' 'ext4_free_inodes_count' '__ext4_new_inode' 'find_get_pages_range_tag' 'generic_write_end' 'xas_clear_mark' '__x64_sys_ptrace' 'audit_log_start' '__dentry_kill' '_find_next_bit' 'do_nanosleep' '__dev_queue_xmit' 'do_signal_stop' 'ep_poll' 'poll_schedule_timeout' 'copy_process' 'kcm_rfree' 'tick_nohz_idle_stop_tick' 'wbt_done' 'blk_mq_dispatch_rq_list' 'wg_packet_send_staged_packets' 'sync_inodes_sb' 'pcpu_alloc' 'tick_sched_do_timer' 'xas_find_marked' 'generic_file_read_iter' 'run_timer_softirq' 'blk_mq_sched_dispatch_requests' '__mark_inode_dirty' [ 93.267763][ C1] ================================================================== [ 93.275948][ C1] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 [ 93.284369][ C1] [ 93.286675][ C1] write to 0xffff88812c01dca4 of 1 bytes by task 0 on cpu 0: [ 93.294425][ C1] timer_clear_idle+0x3d/0x50 [ 93.299135][ C1] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 93.305009][ C1] tick_nohz_idle_exit+0x19c/0x1d0 [ 93.310094][ C1] do_idle+0xac/0x290 [ 93.314061][ C1] cpu_startup_entry+0x14/0x20 [ 93.318801][ C1] rest_init+0xe4/0xeb [ 93.322956][ C1] arch_call_rest_init+0x13/0x2b [ 93.327871][ C1] start_kernel+0x7fe/0x823 [ 93.332352][ C1] secondary_startup_64+0xa4/0xb0 [ 93.337397][ C1] [ 93.339703][ C1] read to 0xffff88812c01dca4 of 1 bytes by interrupt on cpu 1: [ 93.347242][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 93.352773][ C1] add_timer_on+0x192/0x2c0 [ 93.357249][ C1] clocksource_watchdog+0x699/0x7c0 [ 93.362421][ C1] call_timer_fn+0x58/0x2e0 [ 93.366898][ C1] run_timer_softirq+0xb14/0xbd0 [ 93.371807][ C1] __do_softirq+0x118/0x34a [ 93.376294][ C1] run_ksoftirqd+0x41/0x60 [ 93.380693][ C1] smpboot_thread_fn+0x374/0x4a0 [ 93.385613][ C1] kthread+0x203/0x230 [ 93.389653][ C1] ret_from_fork+0x1f/0x30 [ 93.394035][ C1] [ 93.396332][ C1] Reported by Kernel Concurrency Sanitizer on: [ 93.402469][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 93.410584][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.420609][ C1] ================================================================== [ 93.428641][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 93.435202][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 93.443329][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 93.453370][ C1] Call Trace: [ 93.456640][ C1] dump_stack+0x11d/0x187 [ 93.460946][ C1] panic+0x210/0x640 [ 93.464818][ C1] ? vprintk_func+0x89/0x13a [ 93.469397][ C1] kcsan_report.cold+0xc/0x1a [ 93.474053][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 93.479403][ C1] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 93.484943][ C1] add_timer_on+0x192/0x2c0 [ 93.489438][ C1] clocksource_watchdog+0x699/0x7c0 [ 93.494624][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 93.500674][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 93.506628][ C1] call_timer_fn+0x58/0x2e0 [ 93.511124][ C1] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 93.516994][ C1] ? clocksource_select_watchdog+0x410/0x410 [ 93.522960][ C1] run_timer_softirq+0xb14/0xbd0 [ 93.527873][ C1] ? kvm_clock_read+0x14/0x30 [ 93.532522][ C1] ? kvm_sched_clock_read+0x5/0x10 [ 93.537606][ C1] ? sched_clock+0xf/0x20 [ 93.541918][ C1] ? sched_clock_cpu+0x10/0xd0 [ 93.546657][ C1] __do_softirq+0x118/0x34a [ 93.551136][ C1] ? takeover_tasklets+0x240/0x240 [ 93.556221][ C1] run_ksoftirqd+0x41/0x60 [ 93.560609][ C1] smpboot_thread_fn+0x374/0x4a0 [ 93.565536][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 93.571604][ C1] kthread+0x203/0x230 [ 93.575656][ C1] ? kthread_unpark+0xd0/0xd0 [ 93.580319][ C1] ret_from_fork+0x1f/0x30 [ 94.656675][ C1] Shutting down cpus with NMI [ 94.662971][ C1] Kernel Offset: disabled [ 94.667298][ C1] Rebooting in 86400 seconds..