[ 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 '10.128.1.9' (ECDSA) to the list of known hosts. 2021/05/10 12:47:42 fuzzer started 2021/05/10 12:47:43 dialing manager at 10.128.0.163:32911 syzkaller login: [ 17.782431][ T1766] ================================================================== [ 17.784124][ T1766] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 17.785942][ T1766] [ 17.786516][ T1766] write to 0xffff88810556c02c of 4 bytes by task 1768 on cpu 0: [ 17.788492][ T1766] futex_wait_queue_me+0x198/0x260 [ 17.789396][ T1766] futex_wait+0x143/0x430 [ 17.790433][ T1766] do_futex+0x9d8/0x1ee0 [ 17.791802][ T1766] __se_sys_futex+0x21c/0x380 [ 17.792605][ T1766] __x64_sys_futex+0x74/0x80 [ 17.793451][ T1766] do_syscall_64+0x4a/0x90 [ 17.794786][ T1766] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 17.796404][ T1766] [ 17.796765][ T1766] read to 0xffff88810556c02c of 4 bytes by task 1766 on cpu 1: [ 17.797934][ T1766] prepare_signal+0x952/0xeb0 [ 17.799386][ T1766] __send_signal+0x64/0x760 [ 17.801401][ T1766] send_signal+0x281/0x390 [ 17.803315][ T1766] do_send_specific+0x13d/0x1c0 [ 17.808159][ T1766] __x64_sys_tgkill+0x108/0x140 [ 17.813049][ T1766] do_syscall_64+0x4a/0x90 [ 17.818502][ T1766] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 17.824406][ T1766] 2021/05/10 12:47:44 syscalls: 1982 2021/05/10 12:47:44 code coverage: enabled 2021/05/10 12:47:44 comparison tracing: enabled 2021/05/10 12:47:44 extra coverage: enabled 2021/05/10 12:47:44 setuid sandbox: enabled 2021/05/10 12:47:44 namespace sandbox: enabled 2021/05/10 12:47:44 Android sandbox: enabled 2021/05/10 12:47:44 fault injection: enabled 2021/05/10 12:47:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/10 12:47:44 net packet injection: /dev/net/tun does not exist 2021/05/10 12:47:44 net device setup: enabled 2021/05/10 12:47:44 concurrency sanitizer: enabled 2021/05/10 12:47:44 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/10 12:47:44 USB emulation: /dev/raw-gadget does not exist 2021/05/10 12:47:44 hci packet injection: /dev/vhci does not exist 2021/05/10 12:47:44 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/10 12:47:44 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist [ 17.826715][ T1766] Reported by Kernel Concurrency Sanitizer on: [ 17.832870][ T1766] CPU: 1 PID: 1766 Comm: syz-fuzzer Not tainted 5.13.0-rc1-syzkaller #0 [ 17.841185][ T1766] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 17.851265][ T1766] ================================================================== 2021/05/10 12:47:45 suppressing KCSAN reports in functions: 'do_signal_stop' 'ext4_free_inodes_count' 'xas_clear_mark' 'n_tty_receive_buf_common' 'step_into' 'blk_mq_dispatch_rq_list' '__ext4_new_inode' '__xa_set_mark' 'blk_mq_sched_dispatch_requests' 'ext4_mb_good_group' 'alloc_pid' 'shmem_file_read_iter' '__xa_clear_mark' 'ext4_writepages' 'kauditd_thread' 'ext4_dio_write_end_io' 'fast_dput' 'do_nanosleep' 'ext4_mark_iloc_dirty' 'complete_signal' 'blk_mq_rq_ctx_init' '_find_next_bit' 'kthread_is_per_cpu' 'do_readlinkat' 'generic_write_end' 'audit_log_start' 2021/05/10 12:47:45 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/10 12:47:45 fetching corpus: 50, signal 14731/18444 (executing program) 2021/05/10 12:47:45 fetching corpus: 100, signal 21906/27259 (executing program) 2021/05/10 12:47:45 fetching corpus: 150, signal 27712/34657 (executing program) 2021/05/10 12:47:45 fetching corpus: 200, signal 32617/41067 (executing program) 2021/05/10 12:47:45 fetching corpus: 250, signal 36118/46112 (executing program) 2021/05/10 12:47:45 fetching corpus: 300, signal 41987/53179 (executing program) 2021/05/10 12:47:45 fetching corpus: 350, signal 46472/58887 (executing program) 2021/05/10 12:47:45 fetching corpus: 400, signal 48411/62248 (executing program) 2021/05/10 12:47:45 fetching corpus: 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