[ 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 '10.128.0.117' (ECDSA) to the list of known hosts. 2020/07/26 08:43:00 fuzzer started 2020/07/26 08:43:00 dialing manager at 10.128.0.105:44503 2020/07/26 08:43:01 syscalls: 3224 2020/07/26 08:43:01 code coverage: enabled 2020/07/26 08:43:01 comparison tracing: enabled 2020/07/26 08:43:01 extra coverage: enabled 2020/07/26 08:43:01 setuid sandbox: enabled 2020/07/26 08:43:01 namespace sandbox: enabled 2020/07/26 08:43:01 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/26 08:43:01 fault injection: enabled 2020/07/26 08:43:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/26 08:43:01 net packet injection: enabled 2020/07/26 08:43:01 net device setup: enabled 2020/07/26 08:43:01 concurrency sanitizer: enabled 2020/07/26 08:43:01 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/26 08:43:01 USB emulation: enabled 2020/07/26 08:43:01 suppressing KCSAN reports in functions: 'page_counter_charge' 'ext4_mb_find_by_goal' '__xa_clear_mark' 'blk_mq_sched_dispatch_requests' syzkaller login: [ 32.174393][ T8628] ================================================================== [ 32.182497][ T8628] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 32.189742][ T8628] [ 32.192039][ T8628] write to 0xffff888121971350 of 8 bytes by interrupt on cpu 1: [ 32.199636][ T8628] ep_poll_callback+0x29c/0x510 [ 32.204457][ T8628] __wake_up_common+0xbc/0x130 [ 32.209187][ T8628] __wake_up_sync_key+0x83/0xc0 [ 32.214021][ T8628] sock_def_readable+0x61/0xe0 [ 32.218761][ T8628] tcp_rcv_established+0x13c0/0x1520 [ 32.224029][ T8628] tcp_v4_do_rcv+0x25e/0x480 [ 32.228585][ T8628] tcp_v4_rcv+0x219b/0x2420 [ 32.233056][ T8628] ip_protocol_deliver_rcu+0x1f9/0x400 [ 32.238484][ T8628] ip_local_deliver+0x1d6/0x2a0 [ 32.243308][ T8628] ip_sublist_rcv+0x4d4/0x5a0 [ 32.247957][ T8628] ip_list_rcv+0x262/0x290 [ 32.252354][ T8628] __netif_receive_skb_list_core+0x34b/0x450 [ 32.258310][ T8628] __netif_receive_skb_list+0x298/0x310 [ 32.263836][ T8628] netif_receive_skb_list_internal+0xda/0x330 [ 32.269882][ T8628] napi_gro_receive+0x329/0x5a0 [ 32.274697][ T8628] receive_buf+0x7a4/0xcf0 [ 32.279079][ T8628] virtnet_poll+0x2fa/0x780 [ 32.283549][ T8628] napi_poll+0x178/0x4a0 [ 32.287756][ T8628] net_rx_action+0x1ba/0x530 [ 32.292312][ T8628] __do_softirq+0x198/0x360 [ 32.296781][ T8628] asm_call_on_stack+0xf/0x20 [ 32.301429][ T8628] do_softirq_own_stack+0x5d/0x80 [ 32.306420][ T8628] __irq_exit_rcu+0x115/0x120 [ 32.311077][ T8628] common_interrupt+0x14e/0x1e0 [ 32.315895][ T8628] asm_common_interrupt+0x1e/0x40 [ 32.320893][ T8628] native_safe_halt+0xe/0x10 [ 32.325449][ T8628] acpi_idle_enter+0x2ff/0x680 [ 32.330191][ T8628] cpuidle_enter_state+0x245/0x5d0 [ 32.335269][ T8628] cpuidle_enter+0x3c/0x60 [ 32.339653][ T8628] do_idle+0x229/0x310 [ 32.343689][ T8628] cpu_startup_entry+0x15/0x20 [ 32.348424][ T8628] start_secondary+0xe3/0x110 [ 32.353071][ T8628] secondary_startup_64+0xa4/0xb0 [ 32.358066][ T8628] [ 32.360378][ T8628] read to 0xffff888121971350 of 8 bytes by task 8628 on cpu 0: [ 32.368068][ T8628] do_epoll_wait+0x2e2/0x870 [ 32.372633][ T8628] __x64_sys_epoll_pwait+0x92/0x150 [ 32.377802][ T8628] do_syscall_64+0x51/0xb0 [ 32.382187][ T8628] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.388038][ T8628] [ 32.390334][ T8628] Reported by Kernel Concurrency Sanitizer on: [ 32.396462][ T8628] CPU: 0 PID: 8628 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 32.404662][ T8628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.414685][ T8628] ================================================================== [ 32.422726][ T8628] Kernel panic - not syncing: panic_on_warn set ... [ 32.429282][ T8628] CPU: 0 PID: 8628 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 32.437495][ T8628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.447572][ T8628] Call Trace: [ 32.450870][ T8628] dump_stack+0x10f/0x19d [ 32.455219][ T8628] panic+0x207/0x64a [ 32.459097][ T8628] ? vprintk_emit+0x44a/0x4f0 [ 32.463744][ T8628] kcsan_report+0x684/0x690 [ 32.468220][ T8628] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 32.473744][ T8628] ? do_epoll_wait+0x2e2/0x870 [ 32.478484][ T8628] ? __x64_sys_epoll_pwait+0x92/0x150 [ 32.483824][ T8628] ? do_syscall_64+0x51/0xb0 [ 32.488394][ T8628] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.494443][ T8628] ? ep_send_events_proc+0x4fd/0x620 [ 32.499710][ T8628] kcsan_setup_watchpoint+0x453/0x4d0 [ 32.505052][ T8628] do_epoll_wait+0x2e2/0x870 [ 32.509617][ T8628] ? debug_smp_processor_id+0x18/0x20 [ 32.514957][ T8628] __x64_sys_epoll_pwait+0x92/0x150 [ 32.520122][ T8628] do_syscall_64+0x51/0xb0 [ 32.524533][ T8628] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.530670][ T8628] RIP: 0033:0x469240 [ 32.534534][ T8628] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 32.554108][ T8628] RSP: 002b:000000c0000497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 32.562487][ T8628] RAX: ffffffffffffffda RBX: 00000000000000b7 RCX: 0000000000469240 [ 32.570428][ T8628] RDX: 0000000000000080 RSI: 000000c000049840 RDI: 0000000000000003 [ 32.578471][ T8628] RBP: 000000c000049e40 R08: 0000000000000000 R09: 0000000000000000 [ 32.586434][ T8628] R10: 00000000000000b7 R11: 0000000000000246 R12: 0000000000000003 [ 32.594387][ T8628] R13: 000000c000000f00 R14: 0000000000000004 R15: 0000000000000002 [ 32.604082][ T8628] Kernel Offset: disabled [ 32.608396][ T8628] Rebooting in 86400 seconds..