[  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 '10.128.0.147' (ECDSA) to the list of known hosts.
2021/04/21 08:33:12 fuzzer started
2021/04/21 08:33:12 dialing manager at 10.128.0.163:38241
2021/04/21 08:33:13 syscalls: 1982
2021/04/21 08:33:13 code coverage: enabled
2021/04/21 08:33:13 comparison tracing: enabled
2021/04/21 08:33:13 extra coverage: enabled
2021/04/21 08:33:13 setuid sandbox: enabled
2021/04/21 08:33:13 namespace sandbox: enabled
2021/04/21 08:33:13 Android sandbox: enabled
2021/04/21 08:33:13 fault injection: enabled
2021/04/21 08:33:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2021/04/21 08:33:13 net packet injection: /dev/net/tun does not exist
2021/04/21 08:33:13 net device setup: enabled
2021/04/21 08:33:13 concurrency sanitizer: enabled
2021/04/21 08:33:13 devlink PCI setup: PCI device 0000:00:10.0 is not available
2021/04/21 08:33:13 USB emulation: /dev/raw-gadget does not exist
2021/04/21 08:33:13 hci packet injection: /dev/vhci does not exist
2021/04/21 08:33:13 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist
2021/04/21 08:33:13 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist
2021/04/21 08:33:14 suppressing KCSAN reports in functions: 'exit_mm' 'blk_mq_rq_ctx_init' 'blk_mq_sched_dispatch_requests' 'dd_has_work' 'shmem_mknod' 'do_sys_poll' 'do_nanosleep' 'tick_nohz_next_event' 'generic_write_end' '__writeback_single_inode' 'fast_dput' 'ext4_writepages' 'n_tty_receive_buf_common' 'alloc_pid' 'ext4_free_inode' 'do_signal_stop' 'ptrace_check_attach' 'kauditd_thread' '__xa_clear_mark' '__ext4_update_other_inode_time' 'xas_clear_mark' 'filemap_write_and_wait_range' '__ext4_new_inode' 'next_uptodate_page' 'blk_mq_dispatch_rq_list' 'lookup_fast' 'fifo_open' 
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syzkaller login: [   20.343653][ T1763] ==================================================================
[   20.345660][ T1763] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me
[   20.347771][ T1763] 
[   20.348166][ T1763] write to 0xffff8881008c506c of 4 bytes by task 1765 on cpu 1:
[   20.349329][ T1763]  futex_wait_queue_me+0x198/0x260
[   20.350191][ T1763]  futex_wait+0x143/0x430
[   20.350899][ T1763]  do_futex+0x9e8/0x1e10
[   20.351728][ T1763]  __se_sys_futex+0x2a8/0x390
[   20.352927][ T1763]  __x64_sys_futex+0x74/0x80
[   20.354360][ T1763]  do_syscall_64+0x34/0x50
[   20.355381][ T1763]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   20.356893][ T1763] 
[   20.357448][ T1763] read to 0xffff8881008c506c of 4 bytes by task 1763 on cpu 0:
[   20.359118][ T1763]  complete_signal+0x7c/0x600
[   20.360321][ T1763]  __send_signal+0x680/0x760
[   20.361114][ T1763]  send_signal+0x38e/0x3d0
[   20.361806][ T1763]  do_send_specific+0x13d/0x1c0
[   20.362673][ T1763]  __x64_sys_tgkill+0x108/0x140
[   20.363638][ T1763]  do_syscall_64+0x34/0x50
[   20.366621][ T1763]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   20.372491][ T1763] 
[   20.374804][ T1763] Reported by Kernel Concurrency Sanitizer on:
[   20.384408][ T1763] CPU: 0 PID: 1763 Comm: syz-fuzzer Not tainted 5.12.0-rc8-syzkaller #0
2021/04/21 08:33:15 fetching corpus: 1150, signal 77037/108208 (executing program)
[   20.392726][ T1763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   20.402760][ T1763] ==================================================================
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