[ 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 syzkaller login: [ 25.165220][ T8595] sshd (8595) used greatest stack depth: 9816 bytes left Warning: Permanently added '10.128.0.122' (ECDSA) to the list of known hosts. 2020/07/18 04:19:43 fuzzer started 2020/07/18 04:19:43 dialing manager at 10.128.0.105:44471 2020/07/18 04:19:44 syscalls: 3189 2020/07/18 04:19:44 code coverage: enabled 2020/07/18 04:19:44 comparison tracing: enabled 2020/07/18 04:19:44 extra coverage: enabled 2020/07/18 04:19:44 setuid sandbox: enabled 2020/07/18 04:19:44 namespace sandbox: enabled 2020/07/18 04:19:44 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/18 04:19:44 fault injection: enabled 2020/07/18 04:19:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/18 04:19:44 net packet injection: enabled 2020/07/18 04:19:44 net device setup: enabled 2020/07/18 04:19:44 concurrency sanitizer: enabled 2020/07/18 04:19:44 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/18 04:19:44 USB emulation: enabled 2020/07/18 04:19:44 suppressing KCSAN reports in functions: 'do_nanosleep' 'blk_mq_dispatch_rq_list' 'generic_write_end' 'blk_mq_rq_ctx_init' [ 33.638585][ T8631] ================================================================== [ 33.646720][ T8631] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 33.653963][ T8631] [ 33.656259][ T8631] write to 0xffff888121322b90 of 8 bytes by interrupt on cpu 0: [ 33.663856][ T8631] ep_poll_callback+0x29c/0x510 [ 33.668673][ T8631] __wake_up_common+0xbc/0x130 [ 33.673411][ T8631] __wake_up_sync_key+0x83/0xc0 [ 33.678270][ T8631] sock_def_readable+0x61/0xe0 [ 33.683020][ T8631] tcp_rcv_established+0x13c0/0x1520 [ 33.688271][ T8631] tcp_v4_do_rcv+0x25e/0x480 [ 33.692830][ T8631] tcp_v4_rcv+0x219b/0x2420 [ 33.697325][ T8631] ip_protocol_deliver_rcu+0x1f9/0x400 [ 33.702791][ T8631] ip_local_deliver+0x1d6/0x2a0 [ 33.707606][ T8631] ip_sublist_rcv+0x4d4/0x5a0 [ 33.712262][ T8631] ip_list_rcv+0x262/0x290 [ 33.716646][ T8631] __netif_receive_skb_list_core+0x34b/0x450 [ 33.722589][ T8631] __netif_receive_skb_list+0x298/0x310 [ 33.728101][ T8631] netif_receive_skb_list_internal+0xda/0x330 [ 33.734129][ T8631] napi_gro_receive+0x329/0x5a0 [ 33.738943][ T8631] receive_buf+0x7a4/0xcf0 [ 33.743324][ T8631] virtnet_poll+0x2fa/0x780 [ 33.747793][ T8631] napi_poll+0x178/0x4a0 [ 33.752017][ T8631] net_rx_action+0x1ba/0x530 [ 33.756569][ T8631] __do_softirq+0x198/0x360 [ 33.761035][ T8631] asm_call_on_stack+0xf/0x20 [ 33.765689][ T8631] do_softirq_own_stack+0x5d/0x80 [ 33.770685][ T8631] __irq_exit_rcu+0x115/0x120 [ 33.775327][ T8631] common_interrupt+0x14e/0x1e0 [ 33.780143][ T8631] asm_common_interrupt+0x1e/0x40 [ 33.785133][ T8631] native_safe_halt+0xe/0x10 [ 33.789692][ T8631] acpi_idle_enter+0x2ff/0x680 [ 33.794419][ T8631] cpuidle_enter_state+0x245/0x5d0 [ 33.799535][ T8631] cpuidle_enter+0x3c/0x60 [ 33.803924][ T8631] do_idle+0x229/0x310 [ 33.807965][ T8631] cpu_startup_entry+0x15/0x20 [ 33.812821][ T8631] rest_init+0xd8/0xe0 [ 33.816859][ T8631] arch_call_rest_init+0xa/0xb [ 33.821590][ T8631] start_kernel+0x608/0x6d0 [ 33.826078][ T8631] secondary_startup_64+0xa4/0xb0 [ 33.831073][ T8631] [ 33.833370][ T8631] read to 0xffff888121322b90 of 8 bytes by task 8631 on cpu 1: [ 33.840878][ T8631] do_epoll_wait+0x2e2/0x870 [ 33.845434][ T8631] __x64_sys_epoll_pwait+0x92/0x150 [ 33.850599][ T8631] do_syscall_64+0x51/0xb0 [ 33.854987][ T8631] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.861805][ T8631] [ 33.864098][ T8631] Reported by Kernel Concurrency Sanitizer on: [ 33.870226][ T8631] CPU: 1 PID: 8631 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 33.878438][ T8631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.888459][ T8631] ================================================================== [ 33.896484][ T8631] Kernel panic - not syncing: panic_on_warn set ... [ 33.903054][ T8631] CPU: 1 PID: 8631 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 33.911256][ T8631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.921280][ T8631] Call Trace: [ 33.924541][ T8631] dump_stack+0x10f/0x19d [ 33.928838][ T8631] panic+0x207/0x64a [ 33.932701][ T8631] ? vprintk_emit+0x44a/0x4f0 [ 33.937346][ T8631] kcsan_report+0x684/0x690 [ 33.941829][ T8631] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 33.947342][ T8631] ? do_epoll_wait+0x2e2/0x870 [ 33.952069][ T8631] ? __x64_sys_epoll_pwait+0x92/0x150 [ 33.957420][ T8631] ? do_syscall_64+0x51/0xb0 [ 33.961988][ T8631] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.968029][ T8631] ? ep_send_events_proc+0x4fd/0x620 [ 33.973283][ T8631] kcsan_setup_watchpoint+0x453/0x4d0 [ 33.978624][ T8631] do_epoll_wait+0x2e2/0x870 [ 33.983183][ T8631] ? debug_smp_processor_id+0x18/0x20 [ 33.988537][ T8631] __x64_sys_epoll_pwait+0x92/0x150 [ 33.993698][ T8631] do_syscall_64+0x51/0xb0 [ 33.998081][ T8631] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.003943][ T8631] RIP: 0033:0x469240 [ 34.007834][ T8631] Code: Bad RIP value. [ 34.011867][ T8631] RSP: 002b:000000c0000d17f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 34.020254][ T8631] RAX: ffffffffffffffda RBX: 0000000000000350 RCX: 0000000000469240 [ 34.028195][ T8631] RDX: 0000000000000080 RSI: 000000c0000d1840 RDI: 0000000000000003 [ 34.036132][ T8631] RBP: 000000c0000d1e40 R08: 0000000000000000 R09: 00007ffda27de080 [ 34.044071][ T8631] R10: 0000000000000350 R11: 0000000000000246 R12: 0000000000000003 [ 34.052030][ T8631] R13: 000000c000001500 R14: 0000000000000004 R15: 0000000000000002 [ 34.060965][ T8631] Kernel Offset: disabled [ 34.065300][ T8631] Rebooting in 86400 seconds..