[ OK ] Reached target Login Prompts. [ 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 '10.128.1.47' (ECDSA) to the list of known hosts. 2020/06/30 18:59:16 fuzzer started 2020/06/30 18:59:16 dialing manager at 10.128.0.105:44667 2020/06/30 18:59:16 syscalls: 3106 2020/06/30 18:59:16 code coverage: enabled 2020/06/30 18:59:16 comparison tracing: enabled 2020/06/30 18:59:16 extra coverage: enabled 2020/06/30 18:59:16 setuid sandbox: enabled 2020/06/30 18:59:16 namespace sandbox: enabled 2020/06/30 18:59:16 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/30 18:59:16 fault injection: enabled 2020/06/30 18:59:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/30 18:59:16 net packet injection: enabled 2020/06/30 18:59:16 net device setup: enabled 2020/06/30 18:59:16 concurrency sanitizer: enabled 2020/06/30 18:59:16 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/30 18:59:16 USB emulation: enabled 2020/06/30 18:59:18 suppressing KCSAN reports in functions: 'exit_mm' 'do_epoll_wait' '__process_echoes' 'shmem_unlink' 'n_tty_receive_buf_common' 'copy_process' 'expire_timers' 'find_get_pages_range_tag' 'ext4_writepages' 'ext4_mark_iloc_dirty' 'pcpu_alloc' 'generic_file_buffered_read' '__delayacct_blkio_end' 'blk_mq_request_bypass_insert' 'blk_mq_sched_dispatch_requests' 'ext4_free_inodes_count' 'wbt_issue' 'blk_mq_rq_ctx_init' '__xa_clear_mark' 'do_signal_stop' 'generic_write_end' 'ext4_free_inode' '__ext4_new_inode' '__send_signal' 'page_counter_charge' 'kauditd_thread' syzkaller login: [ 33.971999][ T8662] ================================================================== [ 33.980091][ T8662] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 33.987773][ T8662] [ 33.990082][ T8662] write to 0xffff8881217b4024 of 4 bytes by task 8664 on cpu 0: [ 33.997718][ T8662] futex_wait_queue_me+0x186/0x250 [ 34.002806][ T8662] futex_wait+0x145/0x390 [ 34.007104][ T8662] do_futex+0x144a/0x21c0 [ 34.011402][ T8662] __se_sys_futex+0x26d/0x330 [ 34.016137][ T8662] __x64_sys_futex+0x74/0x80 [ 34.020693][ T8662] do_syscall_64+0x51/0xb0 [ 34.025192][ T8662] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.031055][ T8662] [ 34.033617][ T8662] read to 0xffff8881217b4024 of 4 bytes by task 8662 on cpu 1: [ 34.041132][ T8662] complete_signal+0x7c/0x600 [ 34.045778][ T8662] __send_signal+0x680/0x7d0 [ 34.050382][ T8662] send_signal+0x398/0x3e0 [ 34.054765][ T8662] do_send_sig_info+0x9b/0xe0 [ 34.059409][ T8662] do_send_specific+0xc7/0x100 [ 34.064146][ T8662] __x64_sys_tgkill+0x108/0x140 [ 34.068962][ T8662] do_syscall_64+0x51/0xb0 [ 34.073348][ T8662] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.079248][ T8662] [ 34.081544][ T8662] Reported by Kernel Concurrency Sanitizer on: [ 34.087664][ T8662] CPU: 1 PID: 8662 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0 [ 34.095917][ T8662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.105936][ T8662] ================================================================== [ 34.113962][ T8662] Kernel panic - not syncing: panic_on_warn set ... [ 34.120540][ T8662] CPU: 1 PID: 8662 Comm: syz-fuzzer Not tainted 5.8.0-rc3-syzkaller #0 [ 34.128826][ T8662] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.138847][ T8662] Call Trace: [ 34.142105][ T8662] dump_stack+0x10f/0x19d [ 34.146418][ T8662] panic+0x207/0x64a [ 34.150282][ T8662] ? vprintk_emit+0x44a/0x4f0 [ 34.154936][ T8662] kcsan_report+0x684/0x690 [ 34.159405][ T8662] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 34.164916][ T8662] ? complete_signal+0x7c/0x600 [ 34.169730][ T8662] ? __send_signal+0x680/0x7d0 [ 34.174469][ T8662] ? send_signal+0x398/0x3e0 [ 34.179026][ T8662] ? do_send_sig_info+0x9b/0xe0 [ 34.183855][ T8662] ? do_send_specific+0xc7/0x100 [ 34.188758][ T8662] ? __x64_sys_tgkill+0x108/0x140 [ 34.193748][ T8662] ? do_syscall_64+0x51/0xb0 [ 34.198306][ T8662] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.204357][ T8662] kcsan_setup_watchpoint+0x453/0x4d0 [ 34.209697][ T8662] complete_signal+0x7c/0x600 [ 34.214354][ T8662] __send_signal+0x680/0x7d0 [ 34.218926][ T8662] send_signal+0x398/0x3e0 [ 34.223308][ T8662] do_send_sig_info+0x9b/0xe0 [ 34.227953][ T8662] do_send_specific+0xc7/0x100 [ 34.232687][ T8662] __x64_sys_tgkill+0x108/0x140 [ 34.237517][ T8662] do_syscall_64+0x51/0xb0 [ 34.241901][ T8662] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.247758][ T8662] RIP: 0033:0x468b26 [ 34.251616][ T8662] Code: Bad RIP value. [ 34.255650][ T8662] RSP: 002b:000000c00004feb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 34.264026][ T8662] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 34.272226][ T8662] RDX: 0000000000000017 RSI: 00000000000021d8 RDI: 00000000000021d4 [ 34.280167][ T8662] RBP: 000000c00004fed0 R08: 0000000000000000 R09: 0000000000000000 [ 34.288221][ T8662] R10: 000000c00004fec0 R11: 0000000000000246 R12: 0000000000000012 [ 34.296187][ T8662] R13: 000000c000000900 R14: 0000000000000004 R15: ffffffffffffffff [ 35.419710][ T8662] Shutting down cpus with NMI [ 35.425512][ T8662] Kernel Offset: disabled [ 35.429821][ T8662] Rebooting in 86400 seconds..