[ 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 Warning: Permanently added '10.128.0.99' (ECDSA) to the list of known hosts. 2021/05/17 09:51:32 fuzzer started 2021/05/17 09:51:32 dialing manager at 10.128.0.163:45477 2021/05/17 09:51:32 syscalls: 1997 2021/05/17 09:51:32 code coverage: enabled 2021/05/17 09:51:32 comparison tracing: enabled 2021/05/17 09:51:32 extra coverage: enabled 2021/05/17 09:51:32 setuid sandbox: enabled 2021/05/17 09:51:32 namespace sandbox: enabled 2021/05/17 09:51:32 Android sandbox: enabled 2021/05/17 09:51:32 fault injection: enabled 2021/05/17 09:51:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/17 09:51:32 net packet injection: /dev/net/tun does not exist 2021/05/17 09:51:32 net device setup: enabled 2021/05/17 09:51:32 concurrency sanitizer: enabled 2021/05/17 09:51:32 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/17 09:51:32 USB emulation: /dev/raw-gadget does not exist 2021/05/17 09:51:32 hci packet injection: /dev/vhci does not exist 2021/05/17 09:51:32 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/17 09:51:32 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/17 09:51:34 suppressing KCSAN reports in functions: '__add_to_page_cache_locked' 'exit_mm' 'do_nanosleep' '__ext4_update_other_inode_time' 'blk_mq_rq_ctx_init' 'generic_write_end' 'expire_timers' 'lookup_fast' 'kauditd_thread' 'ext4_free_inodes_count' 'n_tty_receive_buf_common' 'fast_dput' '__io_cqring_fill_event' 'step_into' '__xa_clear_mark' 'filemap_read' 'futex_wait_queue_me' 'audit_log_start' 'do_sys_poll' '__mark_inode_dirty' 'ext4_mark_iloc_dirty' 'alloc_pid' 'ext4_mb_good_group' 'shmem_symlink' 'ext4_writepages' 'xas_find_marked' '_find_next_bit' 'do_signal_stop' 'blk_mq_sched_dispatch_requests' 'tick_nohz_stop_tick' 'get_signal' 'blk_mq_dispatch_rq_list' 'dd_has_work' 'xas_clear_mark' 'internal_add_timer' 2021/05/17 09:51:34 fetching corpus: 0, signal 0/2000 (executing program) 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on cpu 1: [ 19.943685][ T0] tick_sched_timer+0x1f5/0x210 [ 19.944427][ T0] __run_hrtimer+0x160/0x480 [ 19.945170][ T0] hrtimer_interrupt+0x380/0xaf0 [ 19.946160][ T0] __sysvec_apic_timer_interrupt+0x6f/0x1c0 [ 19.947207][ T0] sysvec_apic_timer_interrupt+0x64/0x80 [ 19.948138][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 19.949084][ T0] finish_task_switch+0xda/0x290 [ 19.949781][ T0] __schedule+0x427/0x5b0 [ 19.950464][ T0] schedule+0x67/0x90 [ 19.951025][ T0] exit_to_user_mode_prepare+0xbb/0x190 [ 19.951955][ T0] syscall_exit_to_user_mode+0x20/0x40 [ 19.952762][ T0] do_syscall_64+0x56/0x90 [ 19.953681][ T0] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 19.954624][ T0] [ 19.954968][ T0] read to 0xffffffff83cbf0d0 of 4 bytes by task 0 on cpu 0: [ 19.956045][ T0] tick_nohz_next_event+0x217/0x300 [ 19.956827][ T0] tick_nohz_get_sleep_length+0x121/0x280 [ 19.957757][ T0] menu_select+0x303/0x1050 [ 19.958421][ T0] cpuidle_select+0x3d/0x50 [ 19.959052][ T0] do_idle+0x16f/0x240 [ 19.961541][ T0] cpu_startup_entry+0x15/0x20 [ 19.966298][ T0] rest_init+0xc9/0xd0 [ 19.970381][ T0] arch_call_rest_init+0xa/0xb [ 19.975136][ T0] start_kernel+0x59e/0x623 [ 19.979633][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 19.985504][ T0] 2021/05/17 09:51:34 fetching corpus: 500, signal 51103/68905 (executing program) 2021/05/17 09:51:34 fetching corpus: 550, signal 52908/72157 (executing program) 2021/05/17 09:51:34 fetching corpus: 600, signal 55753/76335 (executing program) [ 19.987799][ T0] Reported by Kernel Concurrency Sanitizer on: [ 19.993930][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc2-syzkaller #0 [ 20.001883][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.011920][ T0] ================================================================== 2021/05/17 09:51:34 fetching corpus: 650, signal 57548/79544 (executing program) 2021/05/17 09:51:34 fetching corpus: 700, signal 59934/83213 (executing program) 2021/05/17 09:51:34 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