[ 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 '10.128.0.137' (ECDSA) to the list of known hosts. 2020/05/11 07:15:35 fuzzer started 2020/05/11 07:15:36 dialing manager at 10.128.0.105:42089 2020/05/11 07:15:38 syscalls: 3055 2020/05/11 07:15:38 code coverage: enabled 2020/05/11 07:15:38 comparison tracing: enabled 2020/05/11 07:15:38 extra coverage: enabled 2020/05/11 07:15:38 setuid sandbox: enabled 2020/05/11 07:15:38 namespace sandbox: enabled 2020/05/11 07:15:38 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/11 07:15:38 fault injection: enabled 2020/05/11 07:15:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/11 07:15:38 net packet injection: enabled 2020/05/11 07:15:38 net device setup: enabled 2020/05/11 07:15:38 concurrency sanitizer: enabled 2020/05/11 07:15:38 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/11 07:15:38 USB emulation: enabled 2020/05/11 07:15:40 adding functions to KCSAN blacklist: 'blk_mq_dispatch_rq_list' 'echo_char' 'do_nanosleep' 'find_get_pages_range_tag' 'ep_poll' 'page_counter_charge' 'alloc_pid' '__ext4_new_inode' 'run_timer_softirq' 'xas_clear_mark' 'generic_write_end' 'add_timer' 'do_exit' syzkaller login: [ 78.355628][ C0] ================================================================== [ 78.363914][ C0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 78.372388][ C0] [ 78.374719][ C0] write to 0xffffffff8764e210 of 4 bytes by task 0 on cpu 1: [ 78.382070][ C0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 78.387592][ C0] do_idle+0x1ad/0x290 [ 78.392004][ C0] cpu_startup_entry+0x14/0x20 [ 78.396762][ C0] start_secondary+0x169/0x1b0 [ 78.401519][ C0] secondary_startup_64+0xa4/0xb0 [ 78.406636][ C0] [ 78.408957][ C0] read to 0xffffffff8764e210 of 4 bytes by interrupt on cpu 0: [ 78.416516][ C0] tick_sched_do_timer+0x2e/0xd0 [ 78.421714][ C0] tick_sched_timer+0x3f/0xd0 [ 78.426403][ C0] __hrtimer_run_queues+0x271/0x600 [ 78.431764][ C0] hrtimer_interrupt+0x226/0x490 [ 78.436710][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 78.442174][ C0] apic_timer_interrupt+0xf/0x20 [ 78.447116][ C0] native_safe_halt+0xe/0x10 [ 78.451707][ C0] default_idle+0x21/0x170 [ 78.456110][ C0] do_idle+0x1b7/0x290 [ 78.460169][ C0] cpu_startup_entry+0x14/0x20 [ 78.464918][ C0] rest_init+0xe4/0xeb [ 78.468976][ C0] arch_call_rest_init+0x13/0x2b [ 78.476510][ C0] start_kernel+0x7fe/0x823 [ 78.481017][ C0] secondary_startup_64+0xa4/0xb0 [ 78.486122][ C0] [ 78.488431][ C0] Reported by Kernel Concurrency Sanitizer on: [ 78.494574][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 78.502445][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.512631][ C0] ================================================================== [ 78.520678][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 78.527294][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 78.535624][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 78.545888][ C0] Call Trace: [ 78.549154][ C0] [ 78.551997][ C0] dump_stack+0x11d/0x187 [ 78.556335][ C0] panic+0x210/0x640 [ 78.560219][ C0] ? vprintk_func+0x89/0x13a [ 78.564807][ C0] kcsan_report.cold+0xc/0x1a [ 78.569503][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 78.574887][ C0] tick_sched_do_timer+0x2e/0xd0 [ 78.579823][ C0] tick_sched_timer+0x3f/0xd0 [ 78.584525][ C0] __hrtimer_run_queues+0x271/0x600 [ 78.589724][ C0] ? tick_sched_do_timer+0xd0/0xd0 [ 78.594833][ C0] hrtimer_interrupt+0x226/0x490 [ 78.599774][ C0] ? kvm_clock_read+0x14/0x30 [ 78.604443][ C0] smp_apic_timer_interrupt+0xd8/0x270 [ 78.609905][ C0] apic_timer_interrupt+0xf/0x20 [ 78.614968][ C0] [ 78.617902][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 78.623273][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 0c d6 58 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d fc d5 58 00 fb f4 cc 41 54 55 53 e8 97 b2 71 fb e8 a2 21 bc fc 0f 1f 44 00 00 48 [ 78.643054][ C0] RSP: 0018:ffffffff87203e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 78.656865][ C0] RAX: 0000000000000000 RBX: ffffffff8722b840 RCX: ffffffff8285fdf1 [ 78.665443][ C0] RDX: 0000000000000000 RSI: ffffffff8285fdfa RDI: 0000000000000005 [ 78.673421][ C0] RBP: 0000000000000000 R08: ffffffff8722b840 R09: 0000ffff87047920 [ 78.681408][ C0] R10: 0000ffff87203e58 R11: 0000ffff87047927 R12: ffffffff8722b840 [ 78.689374][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8722b840 [ 78.697347][ C0] ? debug_smp_processor_id+0x31/0x129 [ 78.702809][ C0] ? debug_smp_processor_id+0x3a/0x129 [ 78.708275][ C0] default_idle+0x21/0x170 [ 78.712692][ C0] do_idle+0x1b7/0x290 [ 78.716743][ C0] ? debug_smp_processor_id+0x3f/0x129 [ 78.722197][ C0] cpu_startup_entry+0x14/0x20 [ 78.727910][ C0] rest_init+0xe4/0xeb [ 78.732048][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 78.738381][ C0] arch_call_rest_init+0x13/0x2b [ 78.743522][ C0] start_kernel+0x7fe/0x823 [ 78.748233][ C0] secondary_startup_64+0xa4/0xb0 [ 78.754835][ C0] Kernel Offset: disabled [ 78.759157][ C0] Rebooting in 86400 seconds..