[ 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 '10.128.0.43' (ECDSA) to the list of known hosts. 2021/04/19 23:08:17 fuzzer started 2021/04/19 23:08:17 dialing manager at 10.128.0.163:39191 2021/04/19 23:08:18 syscalls: 1982 2021/04/19 23:08:18 code coverage: enabled 2021/04/19 23:08:18 comparison tracing: enabled 2021/04/19 23:08:18 extra coverage: enabled 2021/04/19 23:08:18 setuid sandbox: enabled 2021/04/19 23:08:18 namespace sandbox: enabled 2021/04/19 23:08:18 Android sandbox: enabled 2021/04/19 23:08:18 fault injection: enabled 2021/04/19 23:08:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/19 23:08:18 net packet injection: /dev/net/tun does not exist 2021/04/19 23:08:18 net device setup: enabled 2021/04/19 23:08:18 concurrency sanitizer: enabled 2021/04/19 23:08:18 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/19 23:08:18 USB emulation: /dev/raw-gadget does not exist 2021/04/19 23:08:18 hci packet injection: /dev/vhci does not exist 2021/04/19 23:08:18 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/04/19 23:08:18 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/04/19 23:08:19 suppressing KCSAN reports in functions: 'dd_has_work' '__ext4_new_inode' 'kauditd_thread' 'do_signal_stop' 'do_nanosleep' 'ext4_mpage_readpages' 'ext4_writepages' '__add_to_page_cache_locked' 'ext4_mark_iloc_dirty' 'xas_clear_mark' '__process_echoes' '__ext4_update_other_inode_time' 'blk_mq_rq_ctx_init' 'blk_mq_sched_dispatch_requests' 'blk_mq_dispatch_rq_list' '__xa_clear_mark' 'alloc_pid' 'xas_find_marked' 'tick_nohz_next_event' 'shmem_file_read_iter' 'ext4_free_inode' 'ext4_free_inodes_count' 'n_tty_receive_buf_common' 'step_into' 'generic_write_end' 'lookup_fast' 'complete_signal' 'attach_to_pi_owner' 'internal_add_timer' 'expire_timers' 'tick_sched_timer' 2021/04/19 23:08:19 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/19 23:08:19 fetching corpus: 50, 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signal 134378/208051 (executing program) 2021/04/19 23:08:22 fetching corpus: 4297, signal 134964/209055 (executing program) 2021/04/19 23:08:22 fetching corpus: 4347, signal 135452/209998 (executing program) 2021/04/19 23:08:22 fetching corpus: 4397, signal 135951/210962 (executing program) 2021/04/19 23:08:22 fetching corpus: 4447, signal 136512/211935 (executing program) 2021/04/19 23:08:22 fetching corpus: 4497, signal 137245/212921 (executing program) 2021/04/19 23:08:22 fetching corpus: 4547, signal 137926/213904 (executing program) syzkaller login: [ 22.382197][ T1748] ================================================================== [ 22.383531][ T1748] BUG: KCSAN: data-race in __send_signal / futex_wait_queue_me [ 22.384834][ T1748] [ 22.385229][ T1748] write to 0xffff888100c5402c of 4 bytes by task 1744 on cpu 0: [ 22.386451][ T1748] futex_wait_queue_me+0x198/0x260 [ 22.387276][ T1748] futex_wait+0x143/0x430 [ 22.387979][ T1748] do_futex+0x9e8/0x1e10 [ 22.388629][ T1748] __se_sys_futex+0x2a8/0x390 [ 22.389287][ T1748] __x64_sys_futex+0x74/0x80 [ 22.389988][ T1748] do_syscall_64+0x34/0x50 [ 22.390617][ T1748] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 22.391463][ T1748] [ 22.391791][ T1748] read to 0xffff888100c5402c of 4 bytes by task 1748 on cpu 1: [ 22.392969][ T1748] __send_signal+0x27f/0x760 [ 22.393682][ T1748] send_signal+0x38e/0x3d0 [ 22.394386][ T1748] do_send_specific+0x13d/0x1c0 [ 22.395106][ T1748] __x64_sys_tgkill+0x108/0x140 [ 22.395783][ T1748] do_syscall_64+0x34/0x50 [ 22.396385][ T1748] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 22.397253][ T1748] [ 22.397579][ T1748] Reported by Kernel Concurrency Sanitizer on: [ 22.398568][ T1748] CPU: 1 PID: 1748 Comm: syz-fuzzer Not tainted 5.12.0-rc8-syzkaller #0 [ 22.399908][ T1748] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.401299][ T1748] ================================================================== 2021/04/19 23:08:22 fetching corpus: 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