[ 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 '10.128.0.115' (ECDSA) to the list of known hosts. 2021/05/26 06:40:22 fuzzer started 2021/05/26 06:40:22 dialing manager at 10.128.0.163:35451 2021/05/26 06:40:22 syscalls: 1997 2021/05/26 06:40:22 code coverage: enabled 2021/05/26 06:40:22 comparison tracing: enabled 2021/05/26 06:40:22 extra coverage: enabled 2021/05/26 06:40:22 setuid sandbox: enabled 2021/05/26 06:40:22 namespace sandbox: enabled 2021/05/26 06:40:22 Android sandbox: enabled 2021/05/26 06:40:22 fault injection: enabled 2021/05/26 06:40:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/26 06:40:22 net packet injection: /dev/net/tun does not exist 2021/05/26 06:40:22 net device setup: enabled 2021/05/26 06:40:22 concurrency sanitizer: enabled 2021/05/26 06:40:22 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/26 06:40:22 USB emulation: /dev/raw-gadget does not exist 2021/05/26 06:40:22 hci packet injection: /dev/vhci does not exist 2021/05/26 06:40:22 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/26 06:40:22 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/26 06:40:23 suppressing KCSAN reports in functions: 'blk_mq_dispatch_rq_list' 'xas_clear_mark' 'n_tty_receive_buf_common' 'alloc_pid' 'do_nanosleep' 'step_into' 'kcompactd' '__ext4_update_other_inode_time' 'generic_write_end' '__tty_hangup' 'expire_timers' 'ext4_ext_try_to_merge_right' '__io_queue_sqe' 'do_signal_stop' '__process_echoes' 'dd_has_work' 'audit_log_start' 'ext4_free_inodes_count' 'kauditd_thread' 'do_sys_poll' '_find_next_bit' 'lookup_fast' '__xa_clear_mark' 'blk_mq_rq_ctx_init' 'blk_mq_sched_dispatch_requests' '__lru_add_drain_all' 'ext4_mb_find_by_goal' 'complete_signal' '__ext4_new_inode' '__xa_set_mark' 2021/05/26 06:40:23 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/26 06:40:23 fetching corpus: 50, signal 10559/14417 (executing program) 2021/05/26 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06:40:26 fetching corpus: 4298, signal 138819/223543 (executing program) 2021/05/26 06:40:26 fetching corpus: 4348, signal 139493/224687 (executing program) 2021/05/26 06:40:27 fetching corpus: 4398, signal 139909/225809 (executing program) syzkaller login: [ 21.967437][ T1741] ================================================================== [ 21.969553][ T1741] BUG: KCSAN: data-race in futex_wait_queue_me / prepare_signal [ 21.971477][ T1741] [ 21.972942][ T1741] write to 0xffff8881046d302c of 4 bytes by task 1740 on cpu 0: [ 21.974522][ T1741] futex_wait_queue_me+0x198/0x260 [ 21.975253][ T1741] futex_wait+0x143/0x430 [ 21.976106][ T1741] do_futex+0x9d8/0x1ee0 [ 21.977201][ T1741] __se_sys_futex+0x21c/0x380 [ 21.978453][ T1741] __x64_sys_futex+0x74/0x80 [ 21.979689][ T1741] do_syscall_64+0x4a/0x90 [ 21.981089][ T1741] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 21.982055][ T1741] [ 21.982634][ T1741] read to 0xffff8881046d302c of 4 bytes by task 1741 on cpu 1: [ 21.984052][ T1741] prepare_signal+0x952/0xeb0 [ 21.984857][ T1741] __send_signal+0x64/0x760 [ 21.985648][ T1741] send_signal+0x281/0x390 [ 21.986747][ T1741] do_send_specific+0x13d/0x1c0 [ 21.987444][ T1741] __x64_sys_tgkill+0x108/0x140 [ 21.990883][ T1741] do_syscall_64+0x4a/0x90 [ 21.995297][ T1741] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 22.001336][ T1741] [ 22.003667][ T1741] Reported by Kernel Concurrency Sanitizer on: 2021/05/26 06:40:27 fetching corpus: 4448, signal 140444/226942 (executing program) [ 22.009790][ T1741] CPU: 1 PID: 1741 Comm: syz-fuzzer Not tainted 5.13.0-rc3-syzkaller #0 [ 22.018208][ T1741] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.028251][ T1741] ================================================================== 2021/05/26 06:40:27 fetching corpus: 4498, signal 142876/228710 (executing program) 2021/05/26 06:40:27 fetching corpus: 4548, signal 143192/229702 (executing program) 2021/05/26 06:40:27 fetching corpus: 4598, 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