[ 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 '10.128.0.49' (ECDSA) to the list of known hosts. 2020/11/02 21:16:02 fuzzer started 2020/11/02 21:16:02 dialing manager at 10.128.0.105:37729 2020/11/02 21:16:03 syscalls: 3448 2020/11/02 21:16:03 code coverage: enabled 2020/11/02 21:16:03 comparison tracing: enabled 2020/11/02 21:16:03 extra coverage: enabled 2020/11/02 21:16:03 setuid sandbox: enabled 2020/11/02 21:16:03 namespace sandbox: enabled 2020/11/02 21:16:03 Android sandbox: /sys/fs/selinux/policy does not exist 2020/11/02 21:16:03 fault injection: enabled 2020/11/02 21:16:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/11/02 21:16:03 net packet injection: enabled 2020/11/02 21:16:03 net device setup: enabled 2020/11/02 21:16:03 concurrency sanitizer: enabled 2020/11/02 21:16:03 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/11/02 21:16:03 USB emulation: enabled 2020/11/02 21:16:03 hci packet injection: enabled 2020/11/02 21:16:03 wifi device emulation: enabled 2020/11/02 21:16:05 suppressing KCSAN reports in functions: 'ext4_writepages' '__xa_clear_mark' 'n_tty_receive_buf_common' 'do_select' 'snd_seq_check_queue' 'expire_timers' '__ext4_new_inode' 'ext4_free_inodes_count' 'blk_mq_sched_dispatch_requests' 'generic_write_end' 'ext4_free_inode' 'dd_has_work' 'alloc_pid' 'blk_mq_rq_ctx_init' syzkaller login: [ 40.530804][ C0] ================================================================== [ 40.539247][ C0] BUG: KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer [ 40.547323][ C0] [ 40.549650][ C0] write to 0xffffffff86fc2c50 of 4 bytes by task 0 on cpu 1: [ 40.557020][ C0] tick_nohz_stop_tick+0x99/0x410 [ 40.562044][ C0] tick_nohz_idle_stop_tick+0x148/0x2e0 [ 40.567589][ C0] do_idle+0x176/0x230 [ 40.571652][ C0] cpu_startup_entry+0x15/0x20 [ 40.576409][ C0] secondary_startup_64_no_verify+0xa6/0xab [ 40.582473][ C0] [ 40.584789][ C0] read to 0xffffffff86fc2c50 of 4 bytes by interrupt on cpu 0: [ 40.592342][ C0] tick_sched_timer+0x35/0x210 [ 40.597107][ C0] __run_hrtimer+0x133/0x420 [ 40.601714][ C0] hrtimer_interrupt+0x36e/0xa10 [ 40.607507][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 40.613414][ C0] asm_call_irq_on_stack+0xf/0x20 [ 40.619638][ C0] sysvec_apic_timer_interrupt+0x52/0x90 [ 40.625317][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 40.631309][ C0] acpi_idle_enter+0x25b/0x2e0 [ 40.636079][ C0] cpuidle_enter_state+0x2bd/0x750 [ 40.641276][ C0] cpuidle_enter+0x3c/0x60 [ 40.645690][ C0] do_idle+0x193/0x230 [ 40.649860][ C0] cpu_startup_entry+0x15/0x20 [ 40.654608][ C0] rest_init+0xd7/0xe0 [ 40.658922][ C0] arch_call_rest_init+0xa/0xb [ 40.663800][ C0] start_kernel+0x5a0/0x625 [ 40.668290][ C0] secondary_startup_64_no_verify+0xa6/0xab [ 40.674277][ C0] [ 40.676603][ C0] Reported by Kernel Concurrency Sanitizer on: [ 40.682749][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc2-syzkaller #0 [ 40.690712][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.700790][ C0] ================================================================== [ 40.709019][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 40.715606][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc2-syzkaller #0 [ 40.723697][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.733781][ C0] Call Trace: [ 40.737066][ C0] [ 40.739942][ C0] dump_stack+0x116/0x15d [ 40.744363][ C0] panic+0x1e7/0x5fa [ 40.748244][ C0] ? vprintk_emit+0x2f2/0x370 [ 40.752928][ C0] kcsan_report+0x67b/0x680 [ 40.757453][ C0] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 40.762981][ C0] ? tick_sched_timer+0x35/0x210 [ 40.767902][ C0] ? __run_hrtimer+0x133/0x420 [ 40.772649][ C0] ? hrtimer_interrupt+0x36e/0xa10 [ 40.777749][ C0] ? __sysvec_apic_timer_interrupt+0x6f/0x200 [ 40.783802][ C0] ? asm_call_irq_on_stack+0xf/0x20 [ 40.788983][ C0] ? sysvec_apic_timer_interrupt+0x52/0x90 [ 40.794771][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 40.800936][ C0] ? acpi_idle_enter+0x25b/0x2e0 [ 40.805979][ C0] ? cpuidle_enter_state+0x2bd/0x750 [ 40.811260][ C0] ? cpuidle_enter+0x3c/0x60 [ 40.815835][ C0] ? do_idle+0x193/0x230 [ 40.820063][ C0] ? cpu_startup_entry+0x15/0x20 [ 40.824983][ C0] ? rest_init+0xd7/0xe0 [ 40.829224][ C0] ? arch_call_rest_init+0xa/0xb [ 40.834142][ C0] ? start_kernel+0x5a0/0x625 [ 40.838889][ C0] ? secondary_startup_64_no_verify+0xa6/0xab [ 40.844969][ C0] ? enqueue_entity+0x25a/0x480 [ 40.850518][ C0] kcsan_setup_watchpoint+0x46a/0x4d0 [ 40.855882][ C0] tick_sched_timer+0x35/0x210 [ 40.860647][ C0] ? tick_setup_sched_timer+0x260/0x260 [ 40.866192][ C0] __run_hrtimer+0x133/0x420 [ 40.871482][ C0] hrtimer_interrupt+0x36e/0xa10 [ 40.876685][ C0] ? irqtime_account_irq+0x2a/0x90 [ 40.881790][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 40.887684][ C0] asm_call_irq_on_stack+0xf/0x20 [ 40.892687][ C0] [ 40.895614][ C0] sysvec_apic_timer_interrupt+0x52/0x90 [ 40.901248][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 40.907257][ C0] RIP: 0010:acpi_idle_enter+0x25b/0x2e0 [ 40.912807][ C0] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 3e 36 90 fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 7e 31 90 fe 0f 00 2d 51 da 2a 03 fb f4 eb 59 49 8d 7c 24 04 e8 a8 5a a0 fe 41 8b 54 24 04 ec 48 c7 c7 [ 40.934076][ C0] RSP: 0018:ffffffff86a03da8 EFLAGS: 00000246 [ 40.940338][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000008b [ 40.948432][ C0] RDX: ffffffff86a30780 RSI: 0000000000000000 RDI: 0000000000000000 [ 40.956454][ C0] RBP: 0000000000000001 R08: ffffffff82b44602 R09: ffffffff82b445c3 [ 40.964518][ C0] R10: 0000000000000002 R11: ffffffff86a30780 R12: ffff888100eeb464 [ 40.972476][ C0] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bc00000 [ 40.980525][ C0] ? acpi_idle_enter+0x203/0x2e0 [ 40.985455][ C0] ? acpi_idle_enter+0x242/0x2e0 [ 40.990383][ C0] ? acpi_idle_enter+0x242/0x2e0 [ 40.995302][ C0] cpuidle_enter_state+0x2bd/0x750 [ 41.000402][ C0] cpuidle_enter+0x3c/0x60 [ 41.004828][ C0] do_idle+0x193/0x230 [ 41.008883][ C0] cpu_startup_entry+0x15/0x20 [ 41.013633][ C0] rest_init+0xd7/0xe0 [ 41.017701][ C0] ? time_init+0xc/0xc [ 41.021748][ C0] arch_call_rest_init+0xa/0xb [ 41.026496][ C0] start_kernel+0x5a0/0x625 [ 41.031003][ C0] secondary_startup_64_no_verify+0xa6/0xab [ 41.036949][ C0] Kernel Offset: disabled [ 41.041269][ C0] Rebooting in 86400 seconds..