[ 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 '10.128.0.139' (ECDSA) to the list of known hosts. 2021/02/23 10:13:15 fuzzer started 2021/02/23 10:13:15 dialing manager at 10.128.0.163:43025 2021/02/23 10:13:17 syscalls: 3541 2021/02/23 10:13:17 code coverage: enabled 2021/02/23 10:13:17 comparison tracing: enabled 2021/02/23 10:13:17 extra coverage: enabled 2021/02/23 10:13:17 setuid sandbox: enabled 2021/02/23 10:13:17 namespace sandbox: enabled 2021/02/23 10:13:17 Android sandbox: /sys/fs/selinux/policy does not exist 2021/02/23 10:13:17 fault injection: enabled 2021/02/23 10:13:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/02/23 10:13:17 net packet injection: enabled 2021/02/23 10:13:17 net device setup: enabled 2021/02/23 10:13:17 concurrency sanitizer: enabled 2021/02/23 10:13:17 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/02/23 10:13:17 USB emulation: enabled 2021/02/23 10:13:17 hci packet injection: enabled 2021/02/23 10:13:17 wifi device emulation: enabled 2021/02/23 10:13:17 802.15.4 emulation: enabled 2021/02/23 10:13:20 suppressing KCSAN reports in functions: 'generic_write_end' 'pcpu_alloc' '__filemap_fdatawrite_range' 'wg_packet_decrypt_worker' 'jbd2_journal_dirty_metadata' 'expire_timers' '__xa_set_mark' 'futex_wait_queue_me' 'jbd2_journal_stop' 'isolate_migratepages_block' '_prb_read_valid' 'n_tty_receive_buf_common' 'ext4_mb_regular_allocator' 'vfs_fsync_range' 'do_sys_poll' 'atime_needs_update' 'blk_mq_sched_dispatch_requests' 'xas_find_marked' 'start_this_handle' 'ext4_free_inodes_count' 'shmem_add_to_page_cache' 'do_epoll_ctl' 'ext4_mb_find_by_goal' 'ext4_mark_iloc_dirty' 'blk_mq_rq_ctx_init' 'audit_log_start' '__send_signal' 'complete_signal' 'dd_has_work' 'jbd2_journal_commit_transaction' 'wbt_done' 'exit_mm' '__add_to_page_cache_locked' 'kauditd_thread' 'lookup_fast' 'prandom_seed' 'alloc_pid' '__xa_clear_mark' 'find_get_pages_range_tag' 'blk_mq_dispatch_rq_list' '__ext4_new_inode' 2021/02/23 10:13:20 fetching corpus: 0, signal 0/2000 (executing program) 2021/02/23 10:13:20 fetching corpus: 47, signal 14510/18352 (executing program) 2021/02/23 10:13:20 fetching corpus: 97, signal 27261/32786 (executing program) 2021/02/23 10:13:20 fetching corpus: 147, signal 34314/41534 (executing program) 2021/02/23 10:13:20 fetching corpus: 197, signal 40270/49101 (executing program) 2021/02/23 10:13:21 fetching corpus: 247, signal 45168/55613 (executing program) 2021/02/23 10:13:21 fetching corpus: 297, signal 51549/63503 (executing program) 2021/02/23 10:13:21 fetching corpus: 347, signal 54004/67576 (executing program) 2021/02/23 10:13:21 fetching corpus: 397, signal 59376/74357 (executing program) 2021/02/23 10:13:21 fetching corpus: 447, signal 62896/79343 (executing program) 2021/02/23 10:13:21 fetching corpus: 497, signal 66689/84580 (executing program) 2021/02/23 10:13:21 fetching corpus: 547, signal 69132/88491 (executing program) 2021/02/23 10:13:21 fetching corpus: 596, signal 71903/92689 (executing program) 2021/02/23 10:13:21 fetching corpus: 646, signal 73780/96071 (executing program) 2021/02/23 10:13:22 fetching corpus: 696, signal 76382/100027 (executing program) 2021/02/23 10:13:22 fetching corpus: 746, signal 79578/104497 (executing program) 2021/02/23 10:13:22 fetching corpus: 796, signal 82838/109035 (executing program) 2021/02/23 10:13:22 fetching corpus: 846, signal 84549/112181 (executing program) 2021/02/23 10:13:22 fetching corpus: 896, signal 86245/115197 (executing program) 2021/02/23 10:13:22 fetching corpus: 946, signal 88306/118568 (executing program) 2021/02/23 10:13:22 fetching corpus: 996, signal 90994/122471 (executing program) 2021/02/23 10:13:22 fetching corpus: 1046, signal 93285/126002 (executing program) 2021/02/23 10:13:22 fetching corpus: 1096, signal 94417/128497 (executing program) 2021/02/23 10:13:22 fetching corpus: 1146, signal 96780/132032 (executing program) 2021/02/23 10:13:23 fetching corpus: 1196, signal 99690/136023 (executing program) 2021/02/23 10:13:23 fetching corpus: 1246, signal 101649/139142 (executing program) 2021/02/23 10:13:23 fetching corpus: 1296, signal 102597/141390 (executing program) 2021/02/23 10:13:23 fetching corpus: 1346, signal 103963/143985 (executing program) 2021/02/23 10:13:23 fetching corpus: 1396, signal 105296/146525 (executing program) 2021/02/23 10:13:23 fetching corpus: 1446, signal 106373/148891 (executing program) 2021/02/23 10:13:23 fetching corpus: 1496, signal 108203/151882 (executing program) 2021/02/23 10:13:23 fetching corpus: 1546, signal 109977/154781 (executing program) 2021/02/23 10:13:24 fetching corpus: 1596, signal 112348/158157 (executing program) 2021/02/23 10:13:24 fetching corpus: 1645, signal 114014/160871 (executing program) 2021/02/23 10:13:24 fetching corpus: 1695, signal 115186/163188 (executing program) 2021/02/23 10:13:24 fetching corpus: 1745, signal 116755/165770 (executing program) 2021/02/23 10:13:24 fetching corpus: 1795, signal 117742/167919 (executing program) 2021/02/23 10:13:24 fetching corpus: 1845, signal 119882/170961 (executing program) 2021/02/23 10:13:24 fetching corpus: 1895, signal 120973/173206 (executing program) 2021/02/23 10:13:24 fetching corpus: 1945, signal 122376/175627 (executing program) 2021/02/23 10:13:24 fetching corpus: 1995, signal 123569/177904 (executing program) 2021/02/23 10:13:24 fetching corpus: 2045, signal 125013/180256 (executing program) 2021/02/23 10:13:25 fetching corpus: 2095, signal 126178/182464 (executing program) 2021/02/23 10:13:25 fetching corpus: 2145, signal 128548/185522 (executing program) 2021/02/23 10:13:25 fetching corpus: 2195, signal 130479/188261 (executing program) 2021/02/23 10:13:25 fetching corpus: 2245, signal 132074/190770 (executing program) 2021/02/23 10:13:25 fetching corpus: 2295, signal 133329/193006 (executing program) 2021/02/23 10:13:25 fetching corpus: 2345, signal 134399/195079 (executing program) 2021/02/23 10:13:25 fetching corpus: 2395, signal 135433/197110 (executing program) 2021/02/23 10:13:25 fetching corpus: 2445, signal 137148/199583 (executing program) 2021/02/23 10:13:25 fetching corpus: 2495, signal 138191/201650 (executing program) 2021/02/23 10:13:25 fetching corpus: 2545, signal 138987/203505 (executing program) 2021/02/23 10:13:26 fetching corpus: 2595, signal 139674/205240 (executing program) 2021/02/23 10:13:26 fetching corpus: 2645, signal 140981/207379 (executing program) 2021/02/23 10:13:26 fetching corpus: 2695, signal 142976/210020 (executing program) 2021/02/23 10:13:26 fetching corpus: 2745, signal 144044/211951 (executing program) 2021/02/23 10:13:26 fetching corpus: 2795, signal 145154/213951 (executing program) 2021/02/23 10:13:26 fetching corpus: 2845, signal 146047/215789 (executing program) 2021/02/23 10:13:26 fetching corpus: 2895, signal 146857/217565 (executing program) 2021/02/23 10:13:26 fetching corpus: 2945, signal 148258/219743 (executing program) 2021/02/23 10:13:26 fetching corpus: 2995, signal 149052/221477 (executing program) 2021/02/23 10:13:27 fetching corpus: 3045, signal 149885/223242 (executing program) 2021/02/23 10:13:27 fetching corpus: 3095, signal 150762/224945 (executing program) 2021/02/23 10:13:27 fetching corpus: 3145, signal 151616/226689 (executing program) 2021/02/23 10:13:27 fetching corpus: 3195, signal 152854/228614 (executing program) 2021/02/23 10:13:27 fetching corpus: 3245, signal 153804/230372 (executing program) 2021/02/23 10:13:27 fetching corpus: 3295, signal 154571/232031 (executing program) 2021/02/23 10:13:27 fetching corpus: 3345, signal 155265/233641 (executing program) 2021/02/23 10:13:27 fetching corpus: 3395, signal 156249/235393 (executing program) 2021/02/23 10:13:27 fetching corpus: 3445, signal 157170/237150 (executing program) 2021/02/23 10:13:27 fetching corpus: 3495, signal 158215/238966 (executing program) 2021/02/23 10:13:28 fetching corpus: 3545, signal 159757/241037 (executing program) 2021/02/23 10:13:28 fetching corpus: 3594, signal 160403/242538 (executing program) 2021/02/23 10:13:28 fetching corpus: 3644, signal 162307/244804 (executing program) 2021/02/23 10:13:28 fetching corpus: 3694, signal 162930/246265 (executing program) syzkaller login: [ 40.836399][ T0] ================================================================== [ 40.844516][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 40.852411][ T0] [ 40.854723][ T0] write to 0xffffffff87bc52a0 of 4 bytes by interrupt on cpu 0: [ 40.862365][ T0] tick_sched_timer+0x1f5/0x210 [ 40.867216][ T0] __run_hrtimer+0x163/0x460 [ 40.871822][ T0] hrtimer_interrupt+0x36e/0xa30 [ 40.876745][ T0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 40.882720][ T0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 40.888350][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 40.894315][ T0] [ 40.896616][ T0] read to 0xffffffff87bc52a0 of 4 bytes by task 0 on cpu 1: [ 40.903872][ T0] tick_nohz_next_event+0x217/0x300 [ 40.909071][ T0] tick_nohz_get_sleep_length+0x121/0x280 [ 40.914772][ T0] menu_select+0x2f6/0x1000 [ 40.919261][ T0] cpuidle_select+0x3d/0x50 [ 40.923745][ T0] do_idle+0x15f/0x230 [ 40.927812][ T0] cpu_startup_entry+0x15/0x20 2021/02/23 10:13:28 fetching corpus: 3744, signal 163844/247946 (executing program) [ 40.932572][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 40.938490][ T0] [ 40.940804][ T0] Reported by Kernel Concurrency Sanitizer on: [ 40.946946][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-syzkaller #0 [ 40.954596][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.964633][ T0] ================================================================== [ 40.972694][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 40.979258][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-syzkaller #0 [ 40.986870][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.996944][ T0] Call Trace: [ 41.000213][ T0] dump_stack+0x137/0x19d [ 41.004543][ T0] panic+0x1e7/0x5fa [ 41.008465][ T0] ? vprintk_emit+0x2fa/0x3e0 [ 41.013154][ T0] kcsan_report+0x67b/0x680 [ 41.017639][ T0] ? kcsan_setup_watchpoint+0x40b/0x470 [ 41.023170][ T0] ? tick_nohz_next_event+0x217/0x300 [ 41.028530][ T0] ? tick_nohz_get_sleep_length+0x121/0x280 2021/02/23 10:13:28 fetching corpus: 3794, signal 164769/249589 (executing program) [ 41.034403][ T0] ? menu_select+0x2f6/0x1000 [ 41.039086][ T0] ? cpuidle_select+0x3d/0x50 [ 41.043763][ T0] ? do_idle+0x15f/0x230 [ 41.048039][ T0] ? cpu_startup_entry+0x15/0x20 [ 41.052979][ T0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 41.059062][ T0] ? kcsan_setup_watchpoint+0x26e/0x470 [ 41.064640][ T0] ? ktime_get+0x1b0/0x1e0 [ 41.069048][ T0] ? _raw_spin_trylock+0x20/0x40 [ 41.074011][ T0] ? _raw_spin_unlock_irqrestore+0x27/0x50 [ 41.079847][ T0] kcsan_setup_watchpoint+0x40b/0x470 [ 41.085205][ T0] tick_nohz_next_event+0x217/0x300 [ 41.090390][ T0] tick_nohz_get_sleep_length+0x121/0x280 [ 41.096097][ T0] menu_select+0x2f6/0x1000 [ 41.100591][ T0] ? _raw_spin_unlock_irq+0x22/0x40 [ 41.105783][ T0] cpuidle_select+0x3d/0x50 [ 41.110299][ T0] do_idle+0x15f/0x230 [ 41.114378][ T0] cpu_startup_entry+0x15/0x20 [ 41.119130][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 41.125752][ T0] Kernel Offset: disabled [ 41.130067][ T0] Rebooting in 86400 seconds..