[ OK ] Started OpenBSD Secure Shell server. [ 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 syzkaller login: [ 72.340643][ T8689] sshd (8689) used greatest stack depth: 9888 bytes left Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. 2020/10/05 20:53:42 fuzzer started 2020/10/05 20:53:42 dialing manager at 10.128.0.105:38549 2020/10/05 20:53:42 syscalls: 3432 2020/10/05 20:53:42 code coverage: enabled 2020/10/05 20:53:42 comparison tracing: enabled 2020/10/05 20:53:42 extra coverage: enabled 2020/10/05 20:53:42 setuid sandbox: enabled 2020/10/05 20:53:42 namespace sandbox: enabled 2020/10/05 20:53:42 Android sandbox: /sys/fs/selinux/policy does not exist 2020/10/05 20:53:42 fault injection: enabled 2020/10/05 20:53:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/10/05 20:53:42 net packet injection: enabled 2020/10/05 20:53:42 net device setup: enabled 2020/10/05 20:53:42 concurrency sanitizer: enabled 2020/10/05 20:53:42 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/10/05 20:53:42 USB emulation: enabled 2020/10/05 20:53:42 hci packet injection: enabled 2020/10/05 20:53:42 wifi device emulation: enabled 2020/10/05 20:53:43 suppressing KCSAN reports in functions: 'futex_wait_queue_me' 'ext4_mb_regular_allocator' [ 79.455184][ T0] ================================================================== [ 79.463280][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 79.471135][ T0] [ 79.473437][ T0] write to 0xffffffff88164a90 of 4 bytes by interrupt on cpu 0: [ 79.481038][ T0] tick_sched_timer+0x214/0x230 [ 79.485906][ T0] __run_hrtimer+0x154/0x4b0 [ 79.490473][ T0] hrtimer_interrupt+0x37c/0xa40 [ 79.495408][ T0] __sysvec_apic_timer_interrupt+0xa3/0x280 [ 79.501277][ T0] asm_call_irq_on_stack+0xf/0x20 [ 79.506292][ T0] sysvec_apic_timer_interrupt+0x80/0xd0 [ 79.511906][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 79.517853][ T0] native_safe_halt+0xe/0x10 [ 79.522411][ T0] acpi_idle_do_entry+0x94/0x120 [ 79.527338][ T0] acpi_idle_enter+0x22e/0x260 [ 79.532073][ T0] cpuidle_enter_state+0x2ba/0x840 [ 79.537161][ T0] cpuidle_enter+0x3c/0x60 [ 79.541547][ T0] do_idle+0x1e7/0x2c0 [ 79.545612][ T0] cpu_startup_entry+0x15/0x20 [ 79.550360][ T0] rest_init+0xd8/0xe0 [ 79.554402][ T0] arch_call_rest_init+0xa/0xb [ 79.559152][ T0] start_kernel+0x608/0x6d0 [ 79.563631][ T0] secondary_startup_64+0xa4/0xb0 [ 79.568661][ T0] [ 79.570990][ T0] read to 0xffffffff88164a90 of 4 bytes by task 0 on cpu 1: [ 79.578251][ T0] tick_nohz_next_event+0x21d/0x310 [ 79.583434][ T0] tick_nohz_get_sleep_length+0xca/0x140 [ 79.589046][ T0] menu_select+0x328/0x1030 [ 79.593542][ T0] cpuidle_select+0x3d/0x50 [ 79.598027][ T0] do_idle+0x1ae/0x2c0 [ 79.602075][ T0] cpu_startup_entry+0x15/0x20 [ 79.606815][ T0] secondary_startup_64+0xa4/0xb0 [ 79.611862][ T0] [ 79.614164][ T0] Reported by Kernel Concurrency Sanitizer on: [ 79.620287][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc8-syzkaller #0 [ 79.628143][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.638166][ T0] ================================================================== [ 79.646198][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 79.652771][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc8-syzkaller #0 [ 79.660626][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.670666][ T0] Call Trace: [ 79.673929][ T0] dump_stack+0x10f/0x19d [ 79.678228][ T0] panic+0x207/0x64a [ 79.682097][ T0] ? vprintk_emit+0x44a/0x4f0 [ 79.686745][ T0] kcsan_report+0x684/0x690 [ 79.691220][ T0] ? kcsan_setup_watchpoint+0x41e/0x4a0 [ 79.696735][ T0] ? tick_nohz_next_event+0x21d/0x310 [ 79.702077][ T0] ? tick_nohz_get_sleep_length+0xca/0x140 [ 79.707849][ T0] ? menu_select+0x328/0x1030 [ 79.712494][ T0] ? cpuidle_select+0x3d/0x50 [ 79.717139][ T0] ? do_idle+0x1ae/0x2c0 [ 79.721348][ T0] ? cpu_startup_entry+0x15/0x20 [ 79.726256][ T0] ? secondary_startup_64+0xa4/0xb0 [ 79.731429][ T0] kcsan_setup_watchpoint+0x41e/0x4a0 [ 79.736786][ T0] tick_nohz_next_event+0x21d/0x310 [ 79.741953][ T0] tick_nohz_get_sleep_length+0xca/0x140 [ 79.747565][ T0] menu_select+0x328/0x1030 [ 79.752037][ T0] ? debug_smp_processor_id+0x18/0x20 [ 79.757377][ T0] ? debug_smp_processor_id+0x18/0x20 [ 79.763063][ T0] ? tick_nohz_idle_got_tick+0x53/0x80 [ 79.768522][ T0] cpuidle_select+0x3d/0x50 [ 79.773006][ T0] do_idle+0x1ae/0x2c0 [ 79.777050][ T0] cpu_startup_entry+0x15/0x20 [ 79.781785][ T0] secondary_startup_64+0xa4/0xb0 [ 79.788021][ T0] Kernel Offset: disabled [ 79.792345][ T0] Rebooting in 86400 seconds..