[ 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2021/04/02 09:01:28 fuzzer started 2021/04/02 09:01:28 dialing manager at 10.128.0.163:44131 2021/04/02 09:01:28 syscalls: 3557 2021/04/02 09:01:28 code coverage: enabled 2021/04/02 09:01:28 comparison tracing: enabled 2021/04/02 09:01:28 extra coverage: enabled 2021/04/02 09:01:28 setuid sandbox: enabled 2021/04/02 09:01:28 namespace sandbox: enabled 2021/04/02 09:01:28 Android sandbox: /sys/fs/selinux/policy does not exist 2021/04/02 09:01:28 fault injection: enabled 2021/04/02 09:01:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/02 09:01:28 net packet injection: enabled 2021/04/02 09:01:28 net device setup: enabled 2021/04/02 09:01:28 concurrency sanitizer: enabled 2021/04/02 09:01:28 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/02 09:01:28 USB emulation: enabled 2021/04/02 09:01:28 hci packet injection: enabled 2021/04/02 09:01:28 wifi device emulation: enabled 2021/04/02 09:01:28 802.15.4 emulation: enabled 2021/04/02 09:01:31 suppressing KCSAN reports in functions: 'pcpu_alloc' '__add_to_page_cache_locked' 'alloc_pid' 'do_sys_poll' 'ext4_mark_iloc_dirty' 'ext4_free_inode' 'ext4_mb_regular_allocator' '__blk_mq_sched_dispatch_requests' 'wbt_done' 'expire_timers' 'do_select' '__find_get_block' 'do_nanosleep' '__filemap_fdatawrite_range' 'blk_mq_rq_ctx_init' '__delete_from_page_cache' 'kauditd_thread' 'generic_write_end' 'blk_mq_dispatch_rq_list' 'blk_mq_sched_dispatch_requests' 'n_tty_receive_buf_common' '__writeback_single_inode' 'ext4_writepages' '_prb_read_valid' 'do_signal_stop' 'shmem_file_read_iter' '__xa_clear_mark' 'io_submit_flush_completions' 'audit_log_start' 'dd_has_work' '__send_signal' '__ext4_new_inode' 'xas_find_marked' 'ext4_free_inodes_count' 'shmem_mknod' 'ext4_mb_good_group' 'do_readlinkat' 2021/04/02 09:01:31 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/02 09:01:31 fetching corpus: 50, signal 13484/17387 (executing program) 2021/04/02 09:01:31 fetching corpus: 100, signal 22698/28440 (executing program) syzkaller login: [ 33.736105][ T8355] ================================================================== [ 33.744180][ T8355] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 33.751878][ T8355] [ 33.754177][ T8355] write to 0xffff8881019d002c of 4 bytes by task 8350 on cpu 1: [ 33.761776][ T8355] futex_wait_queue_me+0x186/0x250 [ 33.766867][ T8355] futex_wait+0x145/0x400 [ 33.771173][ T8355] do_futex+0x1062/0x1cd0 [ 33.775477][ T8355] __se_sys_futex+0x2a8/0x390 [ 33.780126][ T8355] __x64_sys_futex+0x74/0x80 [ 33.784690][ T8355] do_syscall_64+0x39/0x80 [ 33.789081][ T8355] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 33.794951][ T8355] [ 33.797298][ T8355] read to 0xffff8881019d002c of 4 bytes by task 8355 on cpu 0: [ 33.804847][ T8355] complete_signal+0x7c/0x600 [ 33.809626][ T8355] __send_signal+0x680/0x790 [ 33.814190][ T8355] send_signal+0x398/0x3e0 [ 33.818579][ T8355] do_send_sig_info+0x9b/0xe0 [ 33.823230][ T8355] do_send_specific+0xc7/0x100 [ 33.827977][ T8355] __x64_sys_tgkill+0x108/0x140 [ 33.832837][ T8355] do_syscall_64+0x39/0x80 [ 33.837230][ T8355] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 33.843103][ T8355] [ 33.845399][ T8355] Reported by Kernel Concurrency Sanitizer on: [ 33.851518][ T8355] CPU: 0 PID: 8355 Comm: syz-fuzzer Not tainted 5.12.0-rc5-syzkaller #0 [ 33.859815][ T8355] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.869853][ T8355] ================================================================== 2021/04/02 09:01:31 fetching corpus: 150, signal 33893/41400 (executing program) 2021/04/02 09:01:31 fetching corpus: 200, signal 40266/49537 (executing program) 2021/04/02 09:01:31 fetching corpus: 250, signal 44888/55922 (executing program) 2021/04/02 09:01:31 fetching corpus: 300, signal 51002/63720 (executing program) 2021/04/02 09:01:31 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