[ 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 '10.128.1.35' (ECDSA) to the list of known hosts. 2021/04/26 09:42:01 fuzzer started 2021/04/26 09:42:01 dialing manager at 10.128.0.163:45705 2021/04/26 09:42:01 syscalls: 1982 2021/04/26 09:42:01 code coverage: enabled 2021/04/26 09:42:01 comparison tracing: enabled 2021/04/26 09:42:01 extra coverage: enabled 2021/04/26 09:42:01 setuid sandbox: enabled 2021/04/26 09:42:01 namespace sandbox: enabled 2021/04/26 09:42:01 Android sandbox: enabled 2021/04/26 09:42:01 fault injection: enabled 2021/04/26 09:42:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/04/26 09:42:01 net packet injection: /dev/net/tun does not exist 2021/04/26 09:42:01 net device setup: enabled 2021/04/26 09:42:01 concurrency sanitizer: enabled 2021/04/26 09:42:01 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/04/26 09:42:01 USB emulation: /dev/raw-gadget does not exist 2021/04/26 09:42:01 hci packet injection: /dev/vhci does not exist 2021/04/26 09:42:01 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/04/26 09:42:01 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/04/26 09:42:03 suppressing KCSAN reports in functions: 'ext4_writepages' 'generic_write_end' 'step_into' 'ext4_free_inodes_count' 'expire_timers' '__send_signal' 'blk_mq_dispatch_rq_list' 'n_tty_receive_buf_common' 'do_group_exit' 'ns_capable' 'aio_read_events' '__xa_clear_mark' 'ext4_free_inode' 'fast_dput' 'kauditd_thread' '__add_to_page_cache_locked' 'put_pipe_info' 'xas_find_marked' 'xas_clear_mark' 'do_readlinkat' 'shmem_symlink' 'do_select' '__blkdev_get' '__find_get_block' 'exit_mm' 'blk_mq_sched_dispatch_requests' 'shmem_mknod' 'alloc_pid' 'do_sys_poll' 'ext4_set_iomap' '__mark_inode_dirty' 'tick_nohz_next_event' '__ext4_new_inode' 'blk_mq_rq_ctx_init' 'do_signal_stop' 'do_nanosleep' 'next_uptodate_page' 2021/04/26 09:42:03 fetching corpus: 0, signal 0/2000 (executing program) 2021/04/26 09:42:03 fetching corpus: 50, signal 11231/15031 (executing program) 2021/04/26 09:42:03 fetching corpus: 100, signal 21585/27032 (executing program) syzkaller login: [ 19.367366][ T1756] ================================================================== [ 19.368806][ T1756] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 19.369900][ T1756] [ 19.370228][ T1756] write to 0xffff88810549c0ac of 4 bytes by task 1752 on cpu 0: [ 19.371313][ T1756] futex_wait_queue_me+0x198/0x260 [ 19.372017][ T1756] futex_wait+0x143/0x430 [ 19.372610][ T1756] do_futex+0x9e8/0x1e10 [ 19.373238][ T1756] __se_sys_futex+0x2a8/0x390 [ 19.373945][ T1756] __x64_sys_futex+0x74/0x80 [ 19.374571][ T1756] do_syscall_64+0x34/0x50 [ 19.375273][ T1756] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 19.376163][ T1756] [ 19.376491][ T1756] read to 0xffff88810549c0ac of 4 bytes by task 1756 on cpu 1: [ 19.377558][ T1756] complete_signal+0x7c/0x600 [ 19.378240][ T1756] __send_signal+0x680/0x760 [ 19.378864][ T1756] send_signal+0x38e/0x3d0 [ 19.379515][ T1756] do_send_specific+0x13d/0x1c0 [ 19.380209][ T1756] __x64_sys_tgkill+0x108/0x140 [ 19.380901][ T1756] do_syscall_64+0x34/0x50 [ 19.381505][ T1756] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 19.382410][ T1756] [ 19.382737][ T1756] Reported by Kernel Concurrency Sanitizer on: [ 19.383751][ T1756] CPU: 1 PID: 1756 Comm: syz-fuzzer Not tainted 5.12.0-syzkaller #0 [ 19.384862][ T1756] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.386232][ T1756] ================================================================== 2021/04/26 09:42:03 fetching corpus: 150, signal 28078/35074 (executing program) 2021/04/26 09:42:03 fetching corpus: 200, signal 30832/39490 (executing program) 2021/04/26 09:42:03 fetching corpus: 250, signal 35957/46075 (executing program) 2021/04/26 09:42:03 fetching corpus: 300, signal 41690/53199 (executing program) 2021/04/26 09:42:03 fetching corpus: 350, signal 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