[ 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 '10.128.0.183' (ECDSA) to the list of known hosts. 2020/11/14 05:12:26 fuzzer started 2020/11/14 05:12:27 dialing manager at 10.128.0.105:45437 2020/11/14 05:12:27 syscalls: 3448 2020/11/14 05:12:27 code coverage: enabled 2020/11/14 05:12:27 comparison tracing: enabled 2020/11/14 05:12:27 extra coverage: enabled 2020/11/14 05:12:27 setuid sandbox: enabled 2020/11/14 05:12:27 namespace sandbox: enabled 2020/11/14 05:12:27 Android sandbox: /sys/fs/selinux/policy does not exist 2020/11/14 05:12:27 fault injection: enabled 2020/11/14 05:12:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/11/14 05:12:27 net packet injection: enabled 2020/11/14 05:12:27 net device setup: enabled 2020/11/14 05:12:27 concurrency sanitizer: enabled 2020/11/14 05:12:27 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/11/14 05:12:27 USB emulation: enabled 2020/11/14 05:12:27 hci packet injection: enabled 2020/11/14 05:12:27 wifi device emulation: enabled 2020/11/14 05:12:32 suppressing KCSAN reports in functions: 'wg_packet_decrypt_worker' 'ext4_free_inode' 'ext4_writepages' 'generic_write_end' 'blk_mq_sched_dispatch_requests' 'ext4_mb_good_group' '__xa_clear_mark' 'futex_wait_queue_me' 'do_select' 'xas_clear_mark' 'kauditd_thread' 'blk_mq_rq_ctx_init' 'shmem_mknod' 'vfs_readlink' '__delayacct_blkio_end' 'ext4_mark_iloc_dirty' 'n_tty_receive_buf_common' '__process_echoes' '__writeback_single_inode' 'step_into' 'filemap_map_pages' 'audit_log_start' '__io_cqring_fill_event' 'ext4_mb_regular_allocator' 'blk_mq_dispatch_rq_list' 'do_sys_poll' 'xas_find_marked' 'nilfs_attach_log_writer' 'ext4_setattr' '__add_to_page_cache_locked' '__ext4_new_inode' 'do_nanosleep' 'ext4_set_iomap' 'lru_add_drain_all' 'snd_rawmidi_poll' 'dd_has_work' 'expire_timers' 'wg_packet_send_staged_packets' '__send_signal' 'find_get_pages_range_tag' 'pcpu_alloc' 'exit_signals' 'wbt_wait' 'generic_file_buffered_read' 'alloc_pid' 'wbt_issue' 'snd_rawmidi_kernel_write1' '__filemap_fdatawrite_range' 'ext4_free_inodes_count' 'do_signal_stop' 'exit_mm' '__delete_from_page_cache' 'ext4_handle_inode_extension' syzkaller login: [ 127.277937][ T0] ================================================================== [ 127.286067][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 127.293971][ T0] [ 127.296277][ T0] write to 0xffffffff86fc1910 of 4 bytes by interrupt on cpu 0: [ 127.303882][ T0] tick_sched_timer+0x1f5/0x210 [ 127.308724][ T0] __run_hrtimer+0x133/0x420 [ 127.313316][ T0] hrtimer_interrupt+0x36e/0xa10 [ 127.318248][ T0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 127.324145][ T0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 127.329765][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 127.335729][ T0] [ 127.338053][ T0] read to 0xffffffff86fc1910 of 4 bytes by task 0 on cpu 1: [ 127.345330][ T0] tick_nohz_next_event+0x217/0x300 [ 127.350522][ T0] tick_nohz_get_sleep_length+0x121/0x270 [ 127.356241][ T0] menu_select+0x2fa/0xf40 [ 127.360654][ T0] cpuidle_select+0x3d/0x50 [ 127.365150][ T0] do_idle+0x15f/0x230 [ 127.369211][ T0] cpu_startup_entry+0x15/0x20 [ 127.373961][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 127.379824][ T0] [ 127.382137][ T0] Reported by Kernel Concurrency Sanitizer on: [ 127.388367][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc3-syzkaller #0 [ 127.396328][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 127.406371][ T0] ================================================================== [ 127.414418][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 127.421024][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.10.0-rc3-syzkaller #0 [ 127.428984][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 127.439024][ T0] Call Trace: [ 127.442315][ T0] dump_stack+0x116/0x15d [ 127.446647][ T0] panic+0x1e7/0x5fa [ 127.450543][ T0] ? vprintk_emit+0x2f2/0x370 [ 127.455243][ T0] kcsan_report+0x67b/0x680 [ 127.459735][ T0] ? kcsan_setup_watchpoint+0x46a/0x4d0 [ 127.465306][ T0] ? tick_nohz_next_event+0x217/0x300 [ 127.470662][ T0] ? tick_nohz_get_sleep_length+0x121/0x270 [ 127.476555][ T0] ? menu_select+0x2fa/0xf40 [ 127.481142][ T0] ? cpuidle_select+0x3d/0x50 [ 127.485816][ T0] ? do_idle+0x15f/0x230 [ 127.490114][ T0] ? cpu_startup_entry+0x15/0x20 [ 127.495089][ T0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 127.501141][ T0] ? ktime_get+0x1b0/0x1e0 [ 127.505547][ T0] kcsan_setup_watchpoint+0x46a/0x4d0 [ 127.510914][ T0] tick_nohz_next_event+0x217/0x300 [ 127.516111][ T0] tick_nohz_get_sleep_length+0x121/0x270 [ 127.521832][ T0] menu_select+0x2fa/0xf40 [ 127.526243][ T0] ? _raw_spin_unlock_irq+0x22/0x40 [ 127.531438][ T0] ? finish_task_switch+0x81/0x280 [ 127.536547][ T0] cpuidle_select+0x3d/0x50 [ 127.541108][ T0] do_idle+0x15f/0x230 [ 127.545164][ T0] cpu_startup_entry+0x15/0x20 [ 127.549924][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 127.555842][ T0] Kernel Offset: disabled [ 127.560151][ T0] Rebooting in 86400 seconds..