[ 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 syzkaller login: [ 23.529866][ T8333] bash (8333) used greatest stack depth: 9656 bytes left Warning: Permanently added '10.128.0.241' (ECDSA) to the list of known hosts. 2021/04/12 23:12:55 fuzzer started 2021/04/12 23:12:56 dialing manager at 10.128.0.163:40423 2021/04/12 23:12:56 syscalls: 3557 2021/04/12 23:12:56 code coverage: enabled 2021/04/12 23:12:56 comparison tracing: enabled 2021/04/12 23:12:56 extra coverage: enabled 2021/04/12 23:12:56 setuid sandbox: enabled 2021/04/12 23:12:56 namespace sandbox: enabled 2021/04/12 23:12:56 Android sandbox: /sys/fs/selinux/policy does not exist 2021/04/12 23:12:56 fault injection: enabled 2021/04/12 23:12:56 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/12 23:12:56 net packet injection: enabled 2021/04/12 23:12:56 net device setup: enabled 2021/04/12 23:12:56 concurrency sanitizer: enabled 2021/04/12 23:12:56 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/12 23:12:56 USB emulation: enabled 2021/04/12 23:12:56 hci packet injection: enabled 2021/04/12 23:12:56 wifi device emulation: enabled 2021/04/12 23:12:56 802.15.4 emulation: enabled 2021/04/12 23:12:58 suppressing KCSAN reports in functions: 'do_nanosleep' '__mark_inode_dirty' 'btrfs_wait_block_group_cache_progress' '__ext4_new_inode' 'generic_write_end' 'ext4_free_inode' 'ext4_free_inodes_count' 'kauditd_thread' 'alloc_pid' '__delete_from_page_cache' 'do_select' 'audit_log_start' '__xa_clear_mark' '__filemap_fdatawrite_range' 'blk_mq_rq_ctx_init' 'wbt_done' 'blk_mq_dispatch_rq_list' 'do_signal_stop' 'pcpu_alloc' 'n_tty_receive_buf_common' 'xas_clear_mark' 'blk_mq_sched_dispatch_requests' 2021/04/12 23:12:58 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/12 23:12:58 fetching corpus: 50, signal 20715/24487 (executing program) 2021/04/12 23:12:58 fetching corpus: 100, signal 35788/41217 (executing program) [ 32.944880][ T8351] ================================================================== [ 32.953331][ T8351] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 32.961049][ T8351] [ 32.963371][ T8351] write to 0xffff8881025ed02c of 4 bytes by task 8355 on cpu 1: [ 32.971050][ T8351] futex_wait_queue_me+0x186/0x250 [ 32.976518][ T8351] futex_wait+0x145/0x400 [ 32.980849][ T8351] do_futex+0x1062/0x1cd0 [ 32.985340][ T8351] __se_sys_futex+0x2a8/0x390 [ 32.990153][ T8351] __x64_sys_futex+0x74/0x80 [ 32.994820][ T8351] do_syscall_64+0x39/0x80 [ 32.999231][ T8351] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 33.005121][ T8351] [ 33.007441][ T8351] read to 0xffff8881025ed02c of 4 bytes by task 8351 on cpu 0: [ 33.014977][ T8351] complete_signal+0x7c/0x600 [ 33.019650][ T8351] __send_signal+0x680/0x790 [ 33.024234][ T8351] send_signal+0x398/0x3e0 [ 33.028640][ T8351] do_send_sig_info+0x9b/0xe0 [ 33.033309][ T8351] do_send_specific+0xc7/0x100 [ 33.038488][ T8351] __x64_sys_tgkill+0x108/0x140 2021/04/12 23:12:58 fetching corpus: 149, signal 44168/51214 (executing program) [ 33.043606][ T8351] do_syscall_64+0x39/0x80 [ 33.048201][ T8351] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 33.054095][ T8351] [ 33.056412][ T8351] Reported by Kernel Concurrency Sanitizer on: [ 33.062682][ T8351] CPU: 0 PID: 8351 Comm: syz-fuzzer Not tainted 5.12.0-rc7-syzkaller #0 [ 33.071092][ T8351] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.081283][ T8351] ================================================================== 2021/04/12 23:12:58 fetching corpus: 199, signal 50020/58656 (executing program) 2021/04/12 23:12:58 fetching corpus: 249, signal 57602/67693 (executing program) 2021/04/12 23:12:58 fetching corpus: 299, signal 64161/75713 (executing program) 2021/04/12 23:12:58 fetching corpus: 349, signal 68069/81097 (executing program) 2021/04/12 23:12:58 fetching corpus: 399, signal 77131/91347 (executing program) 2021/04/12 23:12:58 fetching corpus: 449, 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