[ 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 '10.128.0.19' (ECDSA) to the list of known hosts. 2021/02/14 09:41:12 fuzzer started 2021/02/14 09:41:13 dialing manager at 10.128.0.163:39273 2021/02/14 09:41:13 syscalls: 3540 2021/02/14 09:41:13 code coverage: enabled 2021/02/14 09:41:13 comparison tracing: enabled 2021/02/14 09:41:13 extra coverage: enabled 2021/02/14 09:41:13 setuid sandbox: enabled 2021/02/14 09:41:13 namespace sandbox: enabled 2021/02/14 09:41:13 Android sandbox: /sys/fs/selinux/policy does not exist 2021/02/14 09:41:13 fault injection: enabled 2021/02/14 09:41:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/02/14 09:41:13 net packet injection: enabled 2021/02/14 09:41:13 net device setup: enabled 2021/02/14 09:41:13 concurrency sanitizer: enabled 2021/02/14 09:41:13 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/02/14 09:41:13 USB emulation: enabled 2021/02/14 09:41:13 hci packet injection: enabled 2021/02/14 09:41:13 wifi device emulation: enabled 2021/02/14 09:41:13 802.15.4 emulation: enabled 2021/02/14 09:41:18 suppressing KCSAN reports in functions: 'wg_packet_decrypt_worker' 'data_alloc' 'filemap_map_pages' 'xas_clear_mark' '__io_cqring_overflow_flush' 'jbd2_journal_dirty_metadata' '__fsnotify_parent' 'xas_find_marked' 'lru_add_drain_all' 'caching_thread' '__ext4_new_inode' 'ext4_mb_find_by_goal' 'bpf_lru_pop_free' '__bpf_lru_list_rotate' 'jbd2_journal_stop' 'shmem_unlink' '__filemap_fdatawrite_range' '__xa_clear_mark' 'do_select' 'ext4_writepages' '_prb_read_valid' 'isolate_migratepages_block' 'expire_timers' 'do_nanosleep' 'kauditd_thread' 'shmem_file_read_iter' 'find_get_pages_range_tag' 'generic_write_end' 'exit_mm' '__ext4_handle_dirty_metadata' 'ext4_mb_good_group' 'pcpu_alloc' 'mm_update_next_owner' 'blk_mq_rq_ctx_init' 'blk_mq_request_bypass_insert' 'do_signal_stop' 'ext4_write_end' 'audit_log_start' 'blk_mq_sched_dispatch_requests' 'do_sys_poll' 'kcm_rfree' '__jbd2_journal_file_buffer' '__percpu_counter_compare' 'wbt_issue' '__ext4_update_other_inode_time' 'shmem_add_to_page_cache' 'start_this_handle' 'alloc_pid' 'ext4_mark_iloc_dirty' '__process_echoes' 'ext4_mb_regular_allocator' '__find_get_block' 'wbt_done' '__delete_from_page_cache' 'dput' 'tick_nohz_next_event' '__mark_inode_dirty' 'shmem_mknod' 'exit_signals' 'dd_has_work' 'ext4_free_inodes_count' '__writeback_single_inode' 'vfs_readlink' '__ext4_journal_start_sb' 'futex_wait_queue_me' 'compaction_alloc' 'wbt_wait' '__add_to_page_cache_locked' 'jbd2_journal_commit_transaction' 'ext4_free_inode' 'blk_mq_dispatch_rq_list' 'ext4_fc_commit' 'n_tty_receive_buf_common' 2021/02/14 09:41:18 fetching corpus: 0, signal 0/2000 (executing program) 2021/02/14 09:41:18 fetching corpus: 50, signal 17685/21571 (executing program) 2021/02/14 09:41:18 fetching corpus: 100, signal 36986/42671 (executing program) 2021/02/14 09:41:18 fetching corpus: 150, signal 45924/53402 (executing program) 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KCSAN: data-race in tick_nohz_stop_tick / tick_sched_timer [ 75.986659][ C0] [ 75.988990][ C0] write to 0xffffffff879c1020 of 4 bytes by task 0 on cpu 1: [ 75.996358][ C0] tick_nohz_stop_tick+0x99/0x420 [ 76.001360][ C0] tick_nohz_idle_stop_tick+0x15d/0x310 [ 76.006915][ C0] do_idle+0x176/0x230 [ 76.010959][ C0] cpu_startup_entry+0x15/0x20 [ 76.015707][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 76.021573][ C0] [ 76.023870][ C0] read to 0xffffffff879c1020 of 4 bytes by interrupt on cpu 0: [ 76.031381][ C0] tick_sched_timer+0x35/0x210 [ 76.036120][ C0] __run_hrtimer+0x163/0x460 [ 76.040721][ C0] hrtimer_interrupt+0x36e/0xa30 [ 76.045635][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 76.051510][ C0] asm_call_irq_on_stack+0xf/0x20 [ 76.056538][ C0] sysvec_apic_timer_interrupt+0x52/0x90 [ 76.062153][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 76.068105][ C0] acpi_idle_enter+0x25b/0x2e0 [ 76.072855][ C0] cpuidle_enter_state+0x2b6/0x7c0 [ 76.077943][ C0] cpuidle_enter+0x3c/0x60 [ 76.082350][ C0] do_idle+0x193/0x230 [ 76.086388][ C0] cpu_startup_entry+0x15/0x20 [ 76.091124][ C0] rest_init+0xd7/0xe0 [ 76.095169][ C0] arch_call_rest_init+0xa/0xb [ 76.099908][ C0] start_kernel+0x5a1/0x626 [ 76.104386][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 76.110274][ C0] [ 76.112572][ C0] Reported by Kernel Concurrency Sanitizer on: [ 76.118705][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc7-syzkaller #0 [ 76.126654][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.136684][ C0] ================================================================== [ 76.144733][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 76.151305][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc7-syzkaller #0 [ 76.159254][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.169295][ C0] Call Trace: [ 76.172565][ C0] [ 76.175402][ C0] dump_stack+0x116/0x15d [ 76.179710][ C0] panic+0x1e7/0x5fa [ 76.183589][ C0] ? vprintk_emit+0x2e2/0x360 [ 76.188247][ C0] kcsan_report+0x67b/0x680 [ 76.192735][ C0] ? kcsan_setup_watchpoint+0x472/0x4d0 [ 76.198397][ C0] ? tick_sched_timer+0x35/0x210 [ 76.203312][ C0] ? __run_hrtimer+0x163/0x460 [ 76.208055][ C0] ? hrtimer_interrupt+0x36e/0xa30 [ 76.213140][ C0] ? __sysvec_apic_timer_interrupt+0x6f/0x200 [ 76.219186][ C0] ? asm_call_irq_on_stack+0xf/0x20 [ 76.224380][ C0] ? sysvec_apic_timer_interrupt+0x52/0x90 [ 76.230163][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 76.236296][ C0] ? acpi_idle_enter+0x25b/0x2e0 [ 76.241213][ C0] ? cpuidle_enter_state+0x2b6/0x7c0 [ 76.246475][ C0] ? cpuidle_enter+0x3c/0x60 [ 76.251057][ C0] ? do_idle+0x193/0x230 [ 76.255288][ C0] ? cpu_startup_entry+0x15/0x20 [ 76.260892][ C0] ? rest_init+0xd7/0xe0 [ 76.265107][ C0] ? arch_call_rest_init+0xa/0xb [ 76.270031][ C0] ? start_kernel+0x5a1/0x626 [ 76.274710][ C0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 76.280763][ C0] kcsan_setup_watchpoint+0x472/0x4d0 [ 76.286141][ C0] tick_sched_timer+0x35/0x210 [ 76.291155][ C0] ? tick_setup_sched_timer+0x260/0x260 [ 76.296683][ C0] __run_hrtimer+0x163/0x460 [ 76.301277][ C0] hrtimer_interrupt+0x36e/0xa30 [ 76.306229][ C0] ? irqtime_account_irq+0x2d/0xa0 [ 76.311316][ C0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 76.317191][ C0] asm_call_irq_on_stack+0xf/0x20 [ 76.322194][ C0] [ 76.325102][ C0] sysvec_apic_timer_interrupt+0x52/0x90 [ 76.330739][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 76.336700][ C0] RIP: 0010:acpi_idle_enter+0x25b/0x2e0 [ 76.342226][ C0] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 ee 50 8c fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 2e 4c 8c fe 0f 00 2d 51 c8 25 03 fb f4 eb 59 49 8d 7c 24 04 e8 f8 eb 9c fe 41 8b 54 24 04 ec 48 c7 c7 [ 76.361806][ C0] RSP: 0018:ffffffff87403da0 EFLAGS: 00000246 [ 76.367846][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 76.375791][ C0] RDX: ffffffff87430780 RSI: 0000000000000000 RDI: 0000000000000000 [ 76.383738][ C0] RBP: 0000000000000001 R08: ffffffff82b998c2 R09: ffffffff82b99883 [ 76.391699][ C0] R10: 0000000000000002 R11: ffffffff87430780 R12: ffff8881014e6464 [ 76.399662][ C0] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bc00000 [ 76.407623][ C0] ? acpi_idle_enter+0x203/0x2e0 [ 76.412541][ C0] ? acpi_idle_enter+0x242/0x2e0 [ 76.417457][ C0] cpuidle_enter_state+0x2b6/0x7c0 [ 76.422546][ C0] cpuidle_enter+0x3c/0x60 [ 76.426961][ C0] do_idle+0x193/0x230 [ 76.431004][ C0] cpu_startup_entry+0x15/0x20 [ 76.435743][ C0] rest_init+0xd7/0xe0 [ 76.439800][ C0] ? time_init+0xc/0xc [ 76.443843][ C0] arch_call_rest_init+0xa/0xb [ 76.448583][ C0] start_kernel+0x5a1/0x626 [ 76.453076][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 76.459388][ C0] Kernel Offset: disabled [ 76.463694][ C0] Rebooting in 86400 seconds..