[ 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 '10.128.0.242' (ECDSA) to the list of known hosts. 2021/03/27 20:17:27 fuzzer started 2021/03/27 20:17:27 dialing manager at 10.128.0.163:36309 2021/03/27 20:17:27 syscalls: 3557 2021/03/27 20:17:27 code coverage: enabled 2021/03/27 20:17:27 comparison tracing: enabled 2021/03/27 20:17:27 extra coverage: enabled 2021/03/27 20:17:27 setuid sandbox: enabled 2021/03/27 20:17:27 namespace sandbox: enabled 2021/03/27 20:17:27 Android sandbox: /sys/fs/selinux/policy does not exist 2021/03/27 20:17:27 fault injection: enabled 2021/03/27 20:17:27 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/03/27 20:17:27 net packet injection: enabled 2021/03/27 20:17:27 net device setup: enabled 2021/03/27 20:17:27 concurrency sanitizer: enabled 2021/03/27 20:17:27 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/03/27 20:17:27 USB emulation: enabled 2021/03/27 20:17:27 hci packet injection: enabled 2021/03/27 20:17:27 wifi device emulation: enabled 2021/03/27 20:17:27 802.15.4 emulation: enabled 2021/03/27 20:17:32 suppressing KCSAN reports in functions: 'internal_add_timer' 'prandom_seed' 'ext4_free_inodes_count' 'do_fcntl' 'ext4_mark_iloc_dirty' 'shmem_unlink' 'do_notify_parent_cldstop' 'blk_mq_dispatch_rq_list' 'do_sys_poll' 'exit_mm' 'ext4_sync_file' 'drop_nlink' 'kauditd_thread' '__mark_inode_dirty' '__delete_from_page_cache' 'do_signal_stop' 'file_remove_privs' '__pagevec_lru_add' 'tcp_get_metrics' '__fsnotify_parent' 'generic_write_end' 'fsnotify' 'wbt_issue' 'data_push_tail' 'exit_signals' 'expire_timers' 'n_tty_receive_buf_common' '__blkdev_put' '__xa_clear_mark' 'dput' 'ext4_mb_good_group' 'blk_mq_request_bypass_insert' 'shmem_file_read_iter' 'vfs_fsync_range' 'vfs_readlink' '__writeback_single_inode' '__ext4_new_inode' 'wbt_done' 'tick_nohz_stop_tick' 'lookup_fast' 'dd_has_work' 'pcpu_alloc' 'handle_irq_event' 'data_alloc' 'ext4_writepages' 'alloc_pid' 'isolate_migratepages_block' 'ext4_ext_insert_extent' 'next_uptodate_page' 'blk_mq_sched_dispatch_requests' 'audit_log_start' '__filemap_fdatawrite_range' 'step_into' 'do_select' 'blk_mq_rq_ctx_init' 'ext4_free_inode' 'xas_clear_mark' 'do_nanosleep' 'xas_find_marked' 'futex_wait_queue_me' 'tick_nohz_next_event' 'ext4_handle_inode_extension' 'shmem_symlink' '_prb_read_valid' 'do_readlinkat' 'ext4_mb_regular_allocator' '__xfs_buf_submit' 'shmem_mknod' '__snd_pcm_lib_xfer' 2021/03/27 20:17:32 fetching corpus: 0, signal 0/2000 (executing program) 2021/03/27 20:17:32 fetching corpus: 50, signal 24992/28882 (executing program) 2021/03/27 20:17:32 fetching corpus: 100, signal 34520/40296 (executing program) 2021/03/27 20:17:32 fetching corpus: 150, signal 43581/51200 (executing program) 2021/03/27 20:17:32 fetching corpus: 200, signal 50059/59496 (executing program) 2021/03/27 20:17:32 fetching corpus: 250, signal 57473/68701 (executing program) 2021/03/27 20:17:32 fetching corpus: 300, signal 64074/77064 (executing 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fetching corpus: 13950, signal 396583/695672 (executing program) 2021/03/27 20:17:48 fetching corpus: 14000, signal 397089/696906 (executing program) 2021/03/27 20:17:48 fetching corpus: 14050, signal 397542/698146 (executing program) 2021/03/27 20:17:48 fetching corpus: 14100, signal 398012/699380 (executing program) 2021/03/27 20:17:48 fetching corpus: 14150, signal 398509/700603 (executing program) 2021/03/27 20:17:48 fetching corpus: 14200, signal 399161/701926 (executing program) syzkaller login: [ 51.346073][ C0] ================================================================== [ 51.354913][ C0] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle [ 51.362132][ C0] [ 51.364450][ C0] write to 0xffff88813bd1b925 of 1 bytes by task 0 on cpu 1: [ 51.371934][ C0] timer_clear_idle+0x1e/0x30 [ 51.376611][ C0] __tick_nohz_idle_restart_tick+0x20/0x180 [ 51.382573][ C0] tick_nohz_idle_exit+0x104/0x220 [ 51.387677][ C0] do_idle+0x1f6/0x230 [ 51.391741][ C0] cpu_startup_entry+0x15/0x20 [ 51.396612][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 51.402733][ C0] [ 51.405049][ C0] read to 0xffff88813bd1b925 of 1 bytes by interrupt on cpu 0: [ 51.412577][ C0] __mod_timer+0x8c5/0xc10 [ 51.416995][ C0] mod_timer+0x1b/0x20 [ 51.421130][ C0] sk_reset_timer+0x1f/0xa0 [ 51.425830][ C0] tcp_send_delayed_ack+0x23e/0x250 [ 51.431133][ C0] __tcp_ack_snd_check+0x2f9/0x510 [ 51.436654][ C0] tcp_rcv_established+0x11f0/0x1330 [ 51.442073][ C0] tcp_v4_do_rcv+0x278/0x4a0 [ 51.446652][ C0] tcp_v4_rcv+0x219f/0x2420 [ 51.451144][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0 [ 51.456910][ C0] ip_local_deliver+0x1d6/0x2a0 [ 51.461751][ C0] ip_sublist_rcv+0x4c4/0x590 [ 51.466741][ C0] ip_list_rcv+0x262/0x290 [ 51.471219][ C0] __netif_receive_skb_list_core+0x34b/0x450 [ 51.477332][ C0] __netif_receive_skb_list+0x262/0x2e0 [ 51.483057][ C0] netif_receive_skb_list_internal+0xda/0x330 [ 51.489163][ C0] napi_complete_done+0x1b2/0x3b0 [ 51.494261][ C0] virtqueue_napi_complete+0x28/0x80 [ 51.499672][ C0] virtnet_poll+0x65f/0x790 [ 51.504227][ C0] __napi_poll+0x65/0x3e0 [ 51.508676][ C0] net_rx_action+0x29f/0x680 [ 51.513256][ C0] __do_softirq+0x13c/0x2c3 [ 51.517900][ C0] __irq_exit_rcu+0xb4/0xc0 [ 51.522393][ C0] common_interrupt+0x80/0x90 [ 51.527066][ C0] asm_common_interrupt+0x1e/0x40 [ 51.532618][ C0] acpi_idle_enter+0x25b/0x2e0 [ 51.537378][ C0] cpuidle_enter_state+0x2b6/0x7c0 [ 51.542484][ C0] cpuidle_enter+0x3c/0x60 [ 51.546893][ C0] do_idle+0x193/0x230 [ 51.550957][ C0] cpu_startup_entry+0x15/0x20 [ 51.555715][ C0] rest_init+0xd7/0xe0 [ 51.559777][ C0] arch_call_rest_init+0xa/0xb [ 51.564535][ C0] start_kernel+0x5a1/0x626 [ 51.569027][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 51.574909][ C0] [ 51.577352][ C0] Reported by Kernel Concurrency Sanitizer on: [ 51.583489][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc4-syzkaller #0 [ 51.591471][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.601516][ C0] 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