[ 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 '10.128.0.16' (ECDSA) to the list of known hosts. 2020/06/12 04:16:46 fuzzer started 2020/06/12 04:16:46 dialing manager at 10.128.0.105:39483 2020/06/12 04:16:46 syscalls: 3085 2020/06/12 04:16:46 code coverage: enabled 2020/06/12 04:16:46 comparison tracing: enabled 2020/06/12 04:16:46 extra coverage: enabled 2020/06/12 04:16:46 setuid sandbox: enabled 2020/06/12 04:16:46 namespace sandbox: enabled 2020/06/12 04:16:46 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/12 04:16:46 fault injection: enabled 2020/06/12 04:16:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/12 04:16:46 net packet injection: enabled 2020/06/12 04:16:46 net device setup: enabled 2020/06/12 04:16:46 concurrency sanitizer: enabled 2020/06/12 04:16:46 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/12 04:16:46 USB emulation: enabled 2020/06/12 04:16:47 adding functions to KCSAN blacklist: 'add_timer' 'file_update_time' 'blk_mq_get_request' 'xas_clear_mark' 'ep_poll' syzkaller login: [ 50.606881][ T8915] ================================================================== [ 50.614988][ T8915] BUG: KCSAN: data-race in complete_signal / futex_wait_queue_me [ 50.622675][ T8915] [ 50.625009][ T8915] write to 0xffff888126fed024 of 4 bytes by task 8907 on cpu 0: [ 50.632627][ T8915] futex_wait_queue_me+0x17d/0x290 [ 50.637741][ T8915] futex_wait+0x17e/0x3a0 [ 50.642042][ T8915] do_futex+0xe2/0x15b0 [ 50.646207][ T8915] __x64_sys_futex+0x2dc/0x410 [ 50.650952][ T8915] do_syscall_64+0xc7/0x3b0 [ 50.655431][ T8915] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.661311][ T8915] [ 50.663618][ T8915] read to 0xffff888126fed024 of 4 bytes by task 8915 on cpu 1: [ 50.671140][ T8915] complete_signal+0x85/0x5c0 [ 50.675791][ T8915] __send_signal+0x675/0x8a0 [ 50.680379][ T8915] send_signal+0x211/0x2a0 [ 50.684771][ T8915] do_send_sig_info+0x59/0xc0 [ 50.689435][ T8915] do_send_specific+0xd8/0x100 [ 50.694171][ T8915] do_tkill+0xf8/0x130 [ 50.698262][ T8915] __x64_sys_tgkill+0x6d/0x90 [ 50.702926][ T8915] do_syscall_64+0xc7/0x3b0 [ 50.707405][ T8915] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.713275][ T8915] [ 50.715583][ T8915] Reported by Kernel Concurrency Sanitizer on: [ 50.721713][ T8915] CPU: 1 PID: 8915 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 50.729927][ T8915] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.740053][ T8915] ================================================================== [ 50.748088][ T8915] Kernel panic - not syncing: panic_on_warn set ... [ 50.754869][ T8915] CPU: 1 PID: 8915 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 50.763087][ T8915] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.773117][ T8915] Call Trace: [ 50.776389][ T8915] dump_stack+0x11d/0x187 [ 50.780700][ T8915] panic+0x210/0x640 [ 50.784599][ T8915] ? vprintk_func+0x89/0x13a [ 50.789180][ T8915] kcsan_report.cold+0xc/0x1a [ 50.793850][ T8915] kcsan_setup_watchpoint+0x3fb/0x440 [ 50.799212][ T8915] complete_signal+0x85/0x5c0 [ 50.803875][ T8915] ? __sigqueue_alloc+0x190/0x2c0 [ 50.808879][ T8915] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 50.814761][ T8915] __send_signal+0x675/0x8a0 [ 50.819328][ T8915] send_signal+0x211/0x2a0 [ 50.823794][ T8915] do_send_sig_info+0x59/0xc0 [ 50.828467][ T8915] do_send_specific+0xd8/0x100 [ 50.833226][ T8915] do_tkill+0xf8/0x130 [ 50.837370][ T8915] __x64_sys_tgkill+0x6d/0x90 [ 50.842028][ T8915] do_syscall_64+0xc7/0x3b0 [ 50.846540][ T8915] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.852416][ T8915] RIP: 0033:0x468b26 [ 50.856299][ T8915] 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 [ 50.875895][ T8915] RSP: 002b:000000c0003a3ed8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ea [ 50.884281][ T8915] RAX: ffffffffffffffda RBX: 000000c000000180 RCX: 0000000000468b26 [ 50.892243][ T8915] RDX: 0000000000000017 RSI: 00000000000022cb RDI: 00000000000022c6 [ 50.900191][ T8915] RBP: 000000c0003a3ef8 R08: 00007ffcde227080 R09: 0000000000000032 [ 50.908147][ T8915] R10: 000000c0003a3ec0 R11: 0000000000000246 R12: 00000000000000fa [ 50.916243][ T8915] R13: 0000000000e5e200 R14: 0000000000000000 R15: 0000000000000000 [ 50.925532][ T8915] Kernel Offset: disabled [ 50.930025][ T8915] Rebooting in 86400 seconds..