[ 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 '10.128.0.93' (ECDSA) to the list of known hosts. 2020/07/19 08:27:32 fuzzer started 2020/07/19 08:27:33 dialing manager at 10.128.0.105:46731 2020/07/19 08:27:33 syscalls: 3189 2020/07/19 08:27:33 code coverage: enabled 2020/07/19 08:27:33 comparison tracing: enabled 2020/07/19 08:27:33 extra coverage: enabled 2020/07/19 08:27:33 setuid sandbox: enabled 2020/07/19 08:27:33 namespace sandbox: enabled 2020/07/19 08:27:33 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/19 08:27:33 fault injection: enabled 2020/07/19 08:27:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/19 08:27:33 net packet injection: enabled 2020/07/19 08:27:33 net device setup: enabled 2020/07/19 08:27:33 concurrency sanitizer: enabled 2020/07/19 08:27:33 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/19 08:27:33 USB emulation: enabled 2020/07/19 08:27:34 suppressing KCSAN reports in functions: 'blk_mq_sched_dispatch_requests' 'xas_clear_mark' 'do_nanosleep' 'exit_mm' '__ext4_new_inode' '__xa_clear_mark' 'blk_mq_dispatch_rq_list' 'alloc_pid' 'do_syslog' 'do_sys_poll' syzkaller login: [ 36.293244][ T8628] ================================================================== [ 36.301637][ T8628] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 36.310377][ T8628] [ 36.312698][ T8628] write to 0xffff888124f2c890 of 8 bytes by interrupt on cpu 0: [ 36.320308][ T8628] ep_poll_callback+0x29c/0x510 [ 36.325148][ T8628] __wake_up_common+0xbc/0x130 [ 36.329897][ T8628] __wake_up_sync_key+0x83/0xc0 [ 36.334728][ T8628] sock_def_readable+0x61/0xe0 [ 36.339478][ T8628] tcp_rcv_established+0x13c0/0x1520 [ 36.344730][ T8628] tcp_v4_do_rcv+0x25e/0x480 [ 36.349288][ T8628] tcp_v4_rcv+0x219b/0x2420 [ 36.353789][ T8628] ip_protocol_deliver_rcu+0x1f9/0x400 [ 36.359216][ T8628] ip_local_deliver+0x1d6/0x2a0 [ 36.364051][ T8628] ip_sublist_rcv+0x4d4/0x5a0 [ 36.368694][ T8628] ip_list_rcv+0x262/0x290 [ 36.373080][ T8628] __netif_receive_skb_list_core+0x34b/0x450 [ 36.379044][ T8628] __netif_receive_skb_list+0x298/0x310 [ 36.384561][ T8628] netif_receive_skb_list_internal+0xda/0x330 [ 36.390604][ T8628] napi_gro_receive+0x329/0x5a0 [ 36.395423][ T8628] receive_buf+0x7a4/0xcf0 [ 36.399808][ T8628] virtnet_poll+0x2fa/0x780 [ 36.404280][ T8628] napi_poll+0x178/0x4a0 [ 36.408490][ T8628] net_rx_action+0x1ba/0x530 [ 36.413046][ T8628] __do_softirq+0x198/0x360 [ 36.417517][ T8628] run_ksoftirqd+0x2f/0x60 [ 36.421920][ T8628] smpboot_thread_fn+0x347/0x530 [ 36.426841][ T8628] kthread+0x20d/0x230 [ 36.430879][ T8628] ret_from_fork+0x1f/0x30 [ 36.435263][ T8628] [ 36.437563][ T8628] read to 0xffff888124f2c890 of 8 bytes by task 8628 on cpu 1: [ 36.445102][ T8628] do_epoll_wait+0x2e2/0x870 [ 36.449684][ T8628] __x64_sys_epoll_pwait+0x92/0x150 [ 36.454870][ T8628] do_syscall_64+0x51/0xb0 [ 36.459346][ T8628] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.465202][ T8628] [ 36.467510][ T8628] Reported by Kernel Concurrency Sanitizer on: [ 36.473631][ T8628] CPU: 1 PID: 8628 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 36.481834][ T8628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.491855][ T8628] ================================================================== [ 36.499879][ T8628] Kernel panic - not syncing: panic_on_warn set ... [ 36.506434][ T8628] CPU: 1 PID: 8628 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 36.514633][ T8628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.524669][ T8628] Call Trace: [ 36.527931][ T8628] dump_stack+0x10f/0x19d [ 36.532331][ T8628] panic+0x207/0x64a [ 36.536196][ T8628] ? vprintk_emit+0x44a/0x4f0 [ 36.540844][ T8628] kcsan_report+0x684/0x690 [ 36.545329][ T8628] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 36.550854][ T8628] ? do_epoll_wait+0x2e2/0x870 [ 36.555584][ T8628] ? __x64_sys_epoll_pwait+0x92/0x150 [ 36.560924][ T8628] ? do_syscall_64+0x51/0xb0 [ 36.565482][ T8628] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.571523][ T8628] ? ep_send_events_proc+0x4fd/0x620 [ 36.576777][ T8628] kcsan_setup_watchpoint+0x453/0x4d0 [ 36.582131][ T8628] do_epoll_wait+0x2e2/0x870 [ 36.586691][ T8628] ? debug_smp_processor_id+0x18/0x20 [ 36.592043][ T8628] __x64_sys_epoll_pwait+0x92/0x150 [ 36.597217][ T8628] do_syscall_64+0x51/0xb0 [ 36.601606][ T8628] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.607481][ T8628] RIP: 0033:0x469240 [ 36.611353][ T8628] Code: Bad RIP value. [ 36.615400][ T8628] RSP: 002b:000000c00004f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 36.623777][ T8628] RAX: ffffffffffffffda RBX: 0000000000000347 RCX: 0000000000469240 [ 36.631733][ T8628] RDX: 0000000000000080 RSI: 000000c00004f840 RDI: 0000000000000003 [ 36.639682][ T8628] RBP: 000000c00004fe40 R08: 0000000000000000 R09: 0000000000000000 [ 36.647626][ T8628] R10: 0000000000000347 R11: 0000000000000246 R12: 0000000000000003 [ 36.655571][ T8628] R13: 000000c000000900 R14: 0000000000000002 R15: 0000000000000002 [ 36.664562][ T8628] Kernel Offset: disabled [ 36.668892][ T8628] Rebooting in 86400 seconds..