[ 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 '10.128.1.18' (ECDSA) to the list of known hosts. 2020/07/13 20:13:34 fuzzer started 2020/07/13 20:13:34 dialing manager at 10.128.0.105:37103 2020/07/13 20:13:35 syscalls: 3150 2020/07/13 20:13:35 code coverage: enabled 2020/07/13 20:13:35 comparison tracing: enabled 2020/07/13 20:13:35 extra coverage: enabled 2020/07/13 20:13:35 setuid sandbox: enabled 2020/07/13 20:13:35 namespace sandbox: enabled 2020/07/13 20:13:35 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/13 20:13:35 fault injection: enabled 2020/07/13 20:13:35 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/13 20:13:35 net packet injection: enabled 2020/07/13 20:13:35 net device setup: enabled 2020/07/13 20:13:35 concurrency sanitizer: enabled 2020/07/13 20:13:35 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/13 20:13:35 USB emulation: enabled 2020/07/13 20:13:35 suppressing KCSAN reports in functions: 'dd_has_work' 'blk_mq_sched_dispatch_requests' 'page_counter_charge' '__xa_clear_mark' syzkaller login: [ 36.561147][ T8627] ================================================================== [ 36.569229][ T8627] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 36.576515][ T8627] [ 36.578816][ T8627] write to 0xffff888120666c50 of 8 bytes by interrupt on cpu 1: [ 36.586412][ T8627] ep_poll_callback+0x29c/0x510 [ 36.591228][ T8627] __wake_up_common+0xbc/0x130 [ 36.595955][ T8627] __wake_up_sync_key+0x83/0xc0 [ 36.600773][ T8627] sock_def_readable+0x61/0xe0 [ 36.605502][ T8627] tcp_rcv_established+0x13c0/0x1520 [ 36.610752][ T8627] tcp_v4_do_rcv+0x25e/0x480 [ 36.615308][ T8627] tcp_v4_rcv+0x219b/0x2420 [ 36.619892][ T8627] ip_protocol_deliver_rcu+0x1f9/0x400 [ 36.625323][ T8627] ip_local_deliver+0x1d6/0x2a0 [ 36.630142][ T8627] ip_sublist_rcv+0x4d4/0x5a0 [ 36.634898][ T8627] ip_list_rcv+0x262/0x290 [ 36.639283][ T8627] __netif_receive_skb_list_core+0x34b/0x450 [ 36.645237][ T8627] __netif_receive_skb_list+0x298/0x310 [ 36.650748][ T8627] netif_receive_skb_list_internal+0xda/0x330 [ 36.656778][ T8627] napi_gro_receive+0x329/0x5a0 [ 36.661595][ T8627] receive_buf+0x7a4/0xcf0 [ 36.665979][ T8627] virtnet_poll+0x2fa/0x780 [ 36.670450][ T8627] napi_poll+0x178/0x4a0 [ 36.674736][ T8627] net_rx_action+0x1ba/0x530 [ 36.679298][ T8627] __do_softirq+0x198/0x360 [ 36.683766][ T8627] asm_call_on_stack+0xf/0x20 [ 36.688420][ T8627] do_softirq_own_stack+0x5d/0x80 [ 36.693426][ T8627] __irq_exit_rcu+0x115/0x120 [ 36.698157][ T8627] common_interrupt+0x14e/0x1e0 [ 36.702985][ T8627] asm_common_interrupt+0x1e/0x40 [ 36.708077][ T8627] native_safe_halt+0xe/0x10 [ 36.713127][ T8627] acpi_idle_enter+0x2ff/0x680 [ 36.717860][ T8627] cpuidle_enter_state+0x245/0x5d0 [ 36.722938][ T8627] cpuidle_enter+0x3c/0x60 [ 36.727323][ T8627] do_idle+0x229/0x310 [ 36.731363][ T8627] cpu_startup_entry+0x15/0x20 [ 36.736096][ T8627] start_secondary+0xe3/0x110 [ 36.742748][ T8627] secondary_startup_64+0xa4/0xb0 [ 36.747789][ T8627] [ 36.750090][ T8627] read to 0xffff888120666c50 of 8 bytes by task 8627 on cpu 0: [ 36.757597][ T8627] do_epoll_wait+0x2e2/0x870 [ 36.762173][ T8627] __x64_sys_epoll_pwait+0x92/0x150 [ 36.767338][ T8627] do_syscall_64+0x51/0xb0 [ 36.772111][ T8627] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.777974][ T8627] [ 36.780312][ T8627] Reported by Kernel Concurrency Sanitizer on: [ 36.786557][ T8627] CPU: 0 PID: 8627 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 36.794856][ T8627] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.805754][ T8627] ================================================================== [ 36.813805][ T8627] Kernel panic - not syncing: panic_on_warn set ... [ 36.820371][ T8627] CPU: 0 PID: 8627 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 36.828575][ T8627] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.838613][ T8627] Call Trace: [ 36.841884][ T8627] dump_stack+0x10f/0x19d [ 36.846182][ T8627] panic+0x207/0x64a [ 36.850048][ T8627] ? vprintk_emit+0x44a/0x4f0 [ 36.854693][ T8627] kcsan_report+0x684/0x690 [ 36.859167][ T8627] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 36.864767][ T8627] ? do_epoll_wait+0x2e2/0x870 [ 36.869602][ T8627] ? __x64_sys_epoll_pwait+0x92/0x150 [ 36.874942][ T8627] ? do_syscall_64+0x51/0xb0 [ 36.879502][ T8627] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.885546][ T8627] ? ep_send_events_proc+0x4fd/0x620 [ 36.890802][ T8627] kcsan_setup_watchpoint+0x453/0x4d0 [ 36.896140][ T8627] do_epoll_wait+0x2e2/0x870 [ 36.900700][ T8627] ? debug_smp_processor_id+0x18/0x20 [ 36.906038][ T8627] __x64_sys_epoll_pwait+0x92/0x150 [ 36.911203][ T8627] do_syscall_64+0x51/0xb0 [ 36.915588][ T8627] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 36.921447][ T8627] RIP: 0033:0x469240 [ 36.925351][ T8627] Code: Bad RIP value. [ 36.929384][ T8627] RSP: 002b:000000c00004f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 36.937760][ T8627] RAX: ffffffffffffffda RBX: 00000000000001a0 RCX: 0000000000469240 [ 36.945698][ T8627] RDX: 0000000000000080 RSI: 000000c00004f840 RDI: 0000000000000003 [ 36.953636][ T8627] RBP: 000000c00004fe40 R08: 0000000000000000 R09: 0000000000000000 [ 36.961577][ T8627] R10: 00000000000001a0 R11: 0000000000000246 R12: 0000000000000003 [ 36.969514][ T8627] R13: 000000c000000900 R14: 0000000000000008 R15: 0000000000000004 [ 36.978575][ T8627] Kernel Offset: disabled [ 36.982885][ T8627] Rebooting in 86400 seconds..