[ 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 '10.128.10.54' (ECDSA) to the list of known hosts. 2021/02/19 20:14:09 fuzzer started 2021/02/19 20:14:09 dialing manager at 10.128.0.163:40333 2021/02/19 20:14:09 syscalls: 3542 2021/02/19 20:14:09 code coverage: enabled 2021/02/19 20:14:09 comparison tracing: enabled 2021/02/19 20:14:09 extra coverage: enabled 2021/02/19 20:14:09 setuid sandbox: enabled 2021/02/19 20:14:09 namespace sandbox: enabled 2021/02/19 20:14:09 Android sandbox: /sys/fs/selinux/policy does not exist 2021/02/19 20:14:09 fault injection: enabled 2021/02/19 20:14:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/02/19 20:14:09 net packet injection: enabled 2021/02/19 20:14:09 net device setup: enabled 2021/02/19 20:14:09 concurrency sanitizer: enabled 2021/02/19 20:14:09 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/02/19 20:14:09 USB emulation: enabled 2021/02/19 20:14:09 hci packet injection: enabled 2021/02/19 20:14:09 wifi device emulation: enabled 2021/02/19 20:14:09 802.15.4 emulation: enabled 2021/02/19 20:14:14 suppressing KCSAN reports in functions: 'fuse_set_nowrite' 'audit_log_start' '__ext4_journal_start_sb' 'io_worker_handle_work' '__filemap_fdatawrite_range' 'compaction_alloc' '_prb_read_valid' 'ext4_setattr' 'kauditd_thread' 'shmem_unlink' '__process_echoes' 'tick_nohz_stop_tick' 'shmem_getpage_gfp' 'ext4_fc_commit' '__percpu_counter_compare' 'start_this_handle' 'wbt_done' '__jbd2_journal_file_buffer' 'alloc_pid' 'futex_wait_queue_me' '__xa_set_mark' '__delete_from_page_cache' '__xa_clear_mark' '__mod_timer' 'jbd2_journal_stop' 'generic_write_end' 'ext4_mark_iloc_dirty' '__ext4_update_other_inode_time' 'wbt_issue' 'pcpu_alloc' 'blk_mq_sched_dispatch_requests' 'ext4_write_end' 'unix_dgram_connect' 'dd_has_work' 'do_select' 'do_sys_poll' 'jbd2_journal_commit_transaction' 'n_tty_receive_buf_common' 'do_readlinkat' 'do_signal_stop' 'bpf_lru_pop_free' 'ext4_free_inodes_count' 'blk_mq_rq_ctx_init' 'blk_mq_request_bypass_insert' 'do_nanosleep' 'ext4_mb_good_group' 'filemap_map_pages' 'find_get_pages_range_tag' 'ext4_mb_find_by_goal' 'complete_signal' 'blk_mq_dispatch_rq_list' '__send_signal' 'xas_find_marked' 'mm_update_next_owner' 'delete_from_page_cache_batch' '__mark_inode_dirty' '__add_to_page_cache_locked' 'get_signal' 'shmem_mknod' 'expire_timers' 'ext4_mb_regular_allocator' '__blkdev_put' '__ext4_new_inode' 'jbd2_journal_dirty_metadata' 2021/02/19 20:14:14 fetching corpus: 0, signal 0/2000 (executing program) 2021/02/19 20:14:14 fetching corpus: 47, signal 24505/28334 (executing program) 2021/02/19 20:14:14 fetching corpus: 97, signal 33432/39108 (executing program) 2021/02/19 20:14:14 fetching corpus: 147, signal 43401/50847 (executing program) 2021/02/19 20:14:14 fetching corpus: 197, signal 48096/57326 (executing program) 2021/02/19 20:14:14 fetching corpus: 247, signal 56095/67041 (executing program) 2021/02/19 20:14:14 fetching corpus: 297, signal 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signal 352143/627465 (executing program) 2021/02/19 20:14:46 fetching corpus: 15618, signal 352644/628376 (executing program) 2021/02/19 20:14:46 fetching corpus: 15668, signal 353000/628628 (executing program) 2021/02/19 20:14:47 fetching corpus: 15718, signal 353416/628628 (executing program) 2021/02/19 20:14:47 fetching corpus: 15768, signal 354292/628628 (executing program) 2021/02/19 20:14:47 fetching corpus: 15818, signal 354886/628628 (executing program) [ 67.124778][ T0] ================================================================== [ 67.132902][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_timer [ 67.140812][ T0] [ 67.143143][ T0] write to 0xffffffff879c1020 of 4 bytes by interrupt on cpu 0: [ 67.150778][ T0] tick_sched_timer+0x1f5/0x210 [ 67.155644][ T0] __run_hrtimer+0x163/0x460 [ 67.160227][ T0] hrtimer_interrupt+0x36e/0xa30 [ 67.165450][ T0] __sysvec_apic_timer_interrupt+0x6f/0x200 [ 67.171348][ T0] sysvec_apic_timer_interrupt+0x6f/0x90 [ 67.177050][ T0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 67.183028][ T0] [ 67.185359][ T0] read to 0xffffffff879c1020 of 4 bytes by task 0 on cpu 1: [ 67.192640][ T0] tick_nohz_next_event+0x217/0x300 [ 67.198069][ T0] tick_nohz_get_sleep_length+0x121/0x280 [ 67.203954][ T0] menu_select+0x2f6/0x1000 [ 67.208443][ T0] cpuidle_select+0x3d/0x50 [ 67.213041][ T0] do_idle+0x15f/0x230 [ 67.217099][ T0] cpu_startup_entry+0x15/0x20 2021/02/19 20:14:47 fetching corpus: 15868, signal 355320/628628 (executing program) [ 67.221863][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 67.227930][ T0] [ 67.230238][ T0] Reported by Kernel Concurrency Sanitizer on: [ 67.236600][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-syzkaller #0 [ 67.244229][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.254538][ T0] ================================================================== [ 67.262775][ T0] Kernel panic - not syncing: panic_on_warn set ... 2021/02/19 20:14:47 fetching corpus: 15918, signal 355680/628628 (executing program) [ 67.269349][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.11.0-syzkaller #0 [ 67.277120][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.287483][ T0] Call Trace: [ 67.290753][ T0] dump_stack+0x116/0x15d [ 67.295073][ T0] panic+0x1e7/0x5fa [ 67.299102][ T0] ? vprintk_emit+0x2e2/0x360 [ 67.303790][ T0] kcsan_report+0x67b/0x680 [ 67.308411][ T0] ? kcsan_setup_watchpoint+0x472/0x4d0 [ 67.314082][ T0] ? tick_nohz_next_event+0x217/0x300 [ 67.319669][ T0] ? tick_nohz_get_sleep_length+0x121/0x280 [ 67.325557][ T0] ? menu_select+0x2f6/0x1000 [ 67.330226][ T0] ? cpuidle_select+0x3d/0x50 [ 67.334929][ T0] ? do_idle+0x15f/0x230 [ 67.339196][ T0] ? cpu_startup_entry+0x15/0x20 [ 67.344137][ T0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 67.351089][ T0] ? ktime_get+0x1b0/0x1e0 [ 67.355497][ T0] kcsan_setup_watchpoint+0x472/0x4d0 [ 67.361104][ T0] tick_nohz_next_event+0x217/0x300 [ 67.366458][ T0] tick_nohz_get_sleep_length+0x121/0x280 [ 67.372177][ T0] menu_select+0x2f6/0x1000 [ 67.376795][ T0] ? _raw_spin_unlock_irq+0x22/0x40 [ 67.381986][ T0] cpuidle_select+0x3d/0x50 [ 67.386498][ T0] do_idle+0x15f/0x230 [ 67.390711][ T0] cpu_startup_entry+0x15/0x20 [ 67.395527][ T0] secondary_startup_64_no_verify+0xb0/0xbb [ 67.402278][ T0] Kernel Offset: disabled [ 67.406602][ T0] Rebooting in 86400 seconds..