[ 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 '10.128.1.110' (ECDSA) to the list of known hosts. 2021/05/24 13:27:39 fuzzer started 2021/05/24 13:27:39 dialing manager at 10.128.0.163:35245 2021/05/24 13:27:42 syscalls: 1997 2021/05/24 13:27:42 code coverage: enabled 2021/05/24 13:27:42 comparison tracing: enabled 2021/05/24 13:27:42 extra coverage: enabled 2021/05/24 13:27:42 setuid sandbox: enabled 2021/05/24 13:27:42 namespace sandbox: enabled 2021/05/24 13:27:42 Android sandbox: enabled 2021/05/24 13:27:42 fault injection: enabled 2021/05/24 13:27:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/05/24 13:27:42 net packet injection: /dev/net/tun does not exist 2021/05/24 13:27:42 net device setup: enabled 2021/05/24 13:27:42 concurrency sanitizer: enabled 2021/05/24 13:27:42 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/05/24 13:27:42 USB emulation: /dev/raw-gadget does not exist 2021/05/24 13:27:42 hci packet injection: /dev/vhci does not exist 2021/05/24 13:27:42 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2021/05/24 13:27:42 802.15.4 emulation: /sys/bus/platform/devices/mac802154_hwsim does not exist 2021/05/24 13:27:43 suppressing KCSAN reports in functions: 'step_into' 'tick_nohz_next_event' 'get_signal' '_find_next_bit' 'do_exit' 'xas_clear_mark' '__mark_inode_dirty' 'exit_signals' '__io_queue_sqe' 'blk_mq_rq_ctx_init' 'do_readlinkat' 'dd_has_work' 'generic_write_end' '__xa_clear_mark' 'kauditd_thread' 'blk_mq_dispatch_rq_list' 'n_tty_receive_buf_common' 'alloc_pid' '__ext4_new_inode' 'do_sys_poll' 'ext4_free_inodes_count' 'blk_mq_sched_dispatch_requests' 'fast_dput' 'has_bh_in_lru' 'audit_log_start' 'do_nanosleep' 'mark_buffer_dirty_inode' 2021/05/24 13:27:43 fetching corpus: 0, signal 0/2000 (executing program) 2021/05/24 13:27:43 fetching corpus: 50, signal 7448/11301 (executing program) 2021/05/24 13:27:43 fetching corpus: 100, signal 19551/24992 (executing program) 2021/05/24 13:27:43 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1: [ 27.207428][ T1750] futex_wait_queue_me+0x198/0x260 [ 27.208149][ T1750] futex_wait+0x143/0x430 [ 27.208805][ T1750] do_futex+0x9d8/0x1ee0 [ 27.209422][ T1750] __se_sys_futex+0x21c/0x380 [ 27.210177][ T1750] __x64_sys_futex+0x74/0x80 [ 27.210823][ T1750] do_syscall_64+0x4a/0x90 [ 27.211586][ T1750] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 27.212514][ T1750] [ 27.212902][ T1750] read to 0xffff8881008170ac of 4 bytes by task 1750 on cpu 0: [ 27.214177][ T1750] __send_signal+0x282/0x760 [ 27.214938][ T1750] send_signal+0x281/0x390 [ 27.215585][ T1750] do_send_specific+0x13d/0x1c0 [ 27.216288][ T1750] __x64_sys_tgkill+0x108/0x140 [ 27.216990][ T1750] do_syscall_64+0x4a/0x90 [ 27.217699][ T1750] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 27.218524][ T1750] [ 27.218861][ T1750] Reported by Kernel Concurrency Sanitizer on: [ 27.219717][ T1750] CPU: 0 PID: 1750 Comm: syz-fuzzer Not tainted 5.13.0-rc3-syzkaller #0 [ 27.221065][ T1750] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.222764][ T1750] ================================================================== 2021/05/24 13:27:48 fetching corpus: 3590, signal 128921/186135 (executing program) 2021/05/24 13:27:48 fetching corpus: 3640, signal 130940/187571 (executing program) 2021/05/24 13:27:48 fetching corpus: 3690, signal 131467/188532 (executing program) 2021/05/24 13:27:48 fetching corpus: 3739, signal 131913/189430 (executing program) 2021/05/24 13:27:49 fetching corpus: 3789, signal 132561/190308 (executing program) 2021/05/24 13:27:49 fetching corpus: 3839, signal 133113/191228 (executing program) 2021/05/24 13:27:49 fetching corpus: 3889, signal 133685/192155 (executing program) 2021/05/24 13:27:49 fetching corpus: 3939, signal 134195/193012 (executing program) 2021/05/24 13:27:49 fetching corpus: 3989, signal 135035/193940 (executing program) 2021/05/24 13:27:49 fetching corpus: 4039, signal 135829/194869 (executing program) 2021/05/24 13:27:49 fetching 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