[ 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 '10.128.0.223' (ECDSA) to the list of known hosts. 2020/06/11 00:31:07 fuzzer started 2020/06/11 00:31:07 dialing manager at 10.128.0.105:37751 2020/06/11 00:31:07 syscalls: 3078 2020/06/11 00:31:07 code coverage: enabled 2020/06/11 00:31:07 comparison tracing: enabled 2020/06/11 00:31:07 extra coverage: enabled 2020/06/11 00:31:07 setuid sandbox: enabled 2020/06/11 00:31:07 namespace sandbox: enabled 2020/06/11 00:31:07 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/11 00:31:07 fault injection: enabled 2020/06/11 00:31:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/11 00:31:07 net packet injection: enabled 2020/06/11 00:31:07 net device setup: enabled 2020/06/11 00:31:07 concurrency sanitizer: enabled 2020/06/11 00:31:07 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/11 00:31:07 USB emulation: enabled 2020/06/11 00:31:07 adding functions to KCSAN blacklist: 'run_timer_softirq' 'alloc_pid' 'tick_nohz_next_event' 'ep_poll' syzkaller login: [ 53.603397][ T8892] ================================================================== [ 53.611839][ T8892] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 53.619526][ T8892] [ 53.621838][ T8892] write to 0xffff888121fff0a4 of 4 bytes by task 8902 on cpu 0: [ 53.629444][ T8892] futex_wait_queue_me+0x17d/0x290 [ 53.634637][ T8892] futex_wait+0x17e/0x3a0 [ 53.638943][ T8892] do_futex+0xe2/0x15b0 [ 53.643087][ T8892] __x64_sys_futex+0x2dc/0x410 [ 53.647830][ T8892] do_syscall_64+0xc7/0x3b0 [ 53.652311][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.658181][ T8892] [ 53.660488][ T8892] read to 0xffff888121fff0a4 of 4 bytes by task 8892 on cpu 1: [ 53.668031][ T8892] complete_signal+0x85/0x5c0 [ 53.672682][ T8892] __send_signal+0x675/0x8a0 [ 53.677275][ T8892] send_signal+0x211/0x2a0 [ 53.681693][ T8892] do_send_sig_info+0x59/0xc0 [ 53.686364][ T8892] do_send_specific+0xd8/0x100 [ 53.691114][ T8892] do_tkill+0xf8/0x130 [ 53.695290][ T8892] __x64_sys_tgkill+0x6d/0x90 [ 53.700211][ T8892] do_syscall_64+0xc7/0x3b0 [ 53.704798][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.710657][ T8892] [ 53.712982][ T8892] Reported by Kernel Concurrency Sanitizer on: [ 53.719123][ T8892] CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.727355][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.737526][ T8892] ================================================================== [ 53.745992][ T8892] Kernel panic - not syncing: panic_on_warn set ... [ 53.752727][ T8892] CPU: 1 PID: 8892 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.761236][ T8892] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.771448][ T8892] Call Trace: [ 53.774764][ T8892] dump_stack+0x11d/0x187 [ 53.779083][ T8892] panic+0x210/0x640 [ 53.782982][ T8892] ? vprintk_func+0x89/0x13a [ 53.787740][ T8892] kcsan_report.cold+0xc/0x1a [ 53.792616][ T8892] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.798697][ T8892] complete_signal+0x85/0x5c0 [ 53.803807][ T8892] ? __sigqueue_alloc+0x190/0x2c0 [ 53.808851][ T8892] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 53.814736][ T8892] __send_signal+0x675/0x8a0 [ 53.819331][ T8892] send_signal+0x211/0x2a0 [ 53.823739][ T8892] do_send_sig_info+0x59/0xc0 [ 53.828420][ T8892] do_send_specific+0xd8/0x100 [ 53.833170][ T8892] do_tkill+0xf8/0x130 [ 53.837376][ T8892] __x64_sys_tgkill+0x6d/0x90 [ 53.842039][ T8892] do_syscall_64+0xc7/0x3b0 [ 53.846559][ T8892] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.852443][ T8892] RIP: 0033:0x468b26 [ 53.856359][ T8892] Code: cc cc cc cc b8 27 00 00 00 0f 05 48 89 44 24 08 c3 cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 48 8b 54 24 18 b8 ea 00 00 00 0f 05 cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 48 8b 54 [ 53.876079][ T8892] RSP: 002b:000000c00004beb0 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 53.886250][ T8892] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 53.894297][ T8892] RDX: 0000000000000017 RSI: 00000000000022c6 RDI: 00000000000022b7 [ 53.902529][ T8892] RBP: 000000c00004bed0 R08: 0000000000000000 R09: 0000000000000000 [ 53.910481][ T8892] R10: 000000c00004bec0 R11: 0000000000000246 R12: 00000000000000fb [ 53.919675][ T8892] R13: 0000000000e5b1c0 R14: 0000000000000000 R15: 0000000000000000 [ 53.929283][ T8892] Kernel Offset: disabled [ 53.933822][ T8892] Rebooting in 86400 seconds..