Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. 2020/06/27 12:34:57 fuzzer started 2020/06/27 12:34:57 dialing manager at 10.128.0.105:43943 2020/06/27 12:34:57 syscalls: 3105 2020/06/27 12:34:57 code coverage: enabled 2020/06/27 12:34:57 comparison tracing: enabled 2020/06/27 12:34:57 extra coverage: enabled 2020/06/27 12:34:57 setuid sandbox: enabled 2020/06/27 12:34:57 namespace sandbox: enabled 2020/06/27 12:34:57 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/27 12:34:57 fault injection: enabled 2020/06/27 12:34:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/27 12:34:57 net packet injection: enabled 2020/06/27 12:34:57 net device setup: enabled 2020/06/27 12:34:57 concurrency sanitizer: enabled 2020/06/27 12:34:57 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/27 12:34:57 USB emulation: enabled 2020/06/27 12:34:57 suppressing KCSAN reports in functions: 'alloc_pid' 'do_syslog' syzkaller login: [ 31.574807][ T8629] ================================================================== [ 31.582907][ T8629] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 31.590161][ T8629] [ 31.592464][ T8629] write to 0xffff8881245a6350 of 8 bytes by interrupt on cpu 0: [ 31.600061][ T8629] ep_poll_callback+0x29c/0x510 [ 31.604880][ T8629] __wake_up_common+0xbc/0x130 [ 31.609620][ T8629] __wake_up_sync_key+0x83/0xc0 [ 31.614537][ T8629] sock_def_readable+0x61/0xd0 [ 31.619275][ T8629] tcp_rcv_established+0xfb4/0x1110 [ 31.624445][ T8629] tcp_v4_do_rcv+0x25e/0x480 [ 31.629002][ T8629] tcp_v4_rcv+0x2159/0x23e0 [ 31.633476][ T8629] ip_protocol_deliver_rcu+0x1f9/0x400 [ 31.638899][ T8629] ip_local_deliver+0x1d6/0x2a0 [ 31.643735][ T8629] ip_sublist_rcv+0x4d4/0x5a0 [ 31.648380][ T8629] ip_list_rcv+0x262/0x290 [ 31.652767][ T8629] __netif_receive_skb_list_core+0x34b/0x450 [ 31.658711][ T8629] __netif_receive_skb_list+0x298/0x310 [ 31.664222][ T8629] netif_receive_skb_list_internal+0xda/0x330 [ 31.670252][ T8629] napi_gro_receive+0x329/0x5a0 [ 31.675601][ T8629] receive_buf+0x7a4/0xcf0 [ 31.679998][ T8629] virtnet_poll+0x2fa/0x780 [ 31.684467][ T8629] napi_poll+0x154/0x480 [ 31.688676][ T8629] net_rx_action+0x1ba/0x530 [ 31.693234][ T8629] __do_softirq+0x198/0x360 [ 31.697701][ T8629] asm_call_on_stack+0xf/0x20 [ 31.702368][ T8629] do_softirq_own_stack+0x5d/0x80 [ 31.707359][ T8629] __irq_exit_rcu+0x115/0x120 [ 31.712003][ T8629] common_interrupt+0x14e/0x1e0 [ 31.716820][ T8629] asm_common_interrupt+0x1e/0x40 [ 31.721814][ T8629] kcsan_setup_watchpoint+0x47c/0x4d0 [ 31.727151][ T8629] _raw_spin_lock_irqsave+0x33/0x90 [ 31.732315][ T8629] __test_set_page_writeback+0x1e2/0x420 [ 31.737926][ T8629] ext4_bio_write_page+0xc7/0xcd0 [ 31.742924][ T8629] mpage_submit_page+0xf4/0x170 [ 31.747742][ T8629] ext4_writepages+0x106b/0x1cb0 [ 31.752658][ T8629] do_writepages+0x7b/0x150 [ 31.757138][ T8629] __filemap_fdatawrite_range+0x19b/0x1d0 [ 31.762845][ T8629] filemap_flush+0x1f/0x30 [ 31.767232][ T8629] collapse_file+0x1f65/0x2110 [ 31.771967][ T8629] khugepaged_do_scan+0x1018/0x1380 [ 31.777243][ T8629] khugepaged+0x75/0x670 [ 31.782035][ T8629] kthread+0x210/0x220 [ 31.786184][ T8629] ret_from_fork+0x1f/0x30 [ 31.790569][ T8629] [ 31.792869][ T8629] read to 0xffff8881245a6350 of 8 bytes by task 8629 on cpu 1: [ 31.800539][ T8629] do_epoll_wait+0x2e2/0x840 [ 31.805104][ T8629] __x64_sys_epoll_pwait+0x92/0x140 [ 31.810273][ T8629] do_syscall_64+0x71/0x120 [ 31.814777][ T8629] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.820650][ T8629] [ 31.822947][ T8629] Reported by Kernel Concurrency Sanitizer on: [ 31.829071][ T8629] CPU: 1 PID: 8629 Comm: syz-fuzzer Not tainted 5.8.0-rc2-syzkaller #0 [ 31.837270][ T8629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.847310][ T8629] ================================================================== [ 31.855339][ T8629] Kernel panic - not syncing: panic_on_warn set ... [ 31.861895][ T8629] CPU: 1 PID: 8629 Comm: syz-fuzzer Not tainted 5.8.0-rc2-syzkaller #0 [ 31.870110][ T8629] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.880236][ T8629] Call Trace: [ 31.883499][ T8629] dump_stack+0x10f/0x19d [ 31.887795][ T8629] panic+0x1f8/0x63a [ 31.891659][ T8629] ? vprintk_emit+0x44a/0x4f0 [ 31.896316][ T8629] kcsan_report+0x684/0x690 [ 31.900790][ T8629] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 31.906303][ T8629] ? do_epoll_wait+0x2e2/0x840 [ 31.911043][ T8629] ? __x64_sys_epoll_pwait+0x92/0x140 [ 31.916385][ T8629] ? do_syscall_64+0x71/0x120 [ 31.921032][ T8629] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.927106][ T8629] ? ep_send_events_proc+0x4fd/0x620 [ 31.932365][ T8629] ? sysvec_hyperv_callback+0x90/0x140 [ 31.937803][ T8629] kcsan_setup_watchpoint+0x453/0x4d0 [ 31.943143][ T8629] do_epoll_wait+0x2e2/0x840 [ 31.947705][ T8629] ? fput+0x2d/0x130 [ 31.951569][ T8629] ? check_preemption_disabled+0x8f/0x1a0 [ 31.957255][ T8629] __x64_sys_epoll_pwait+0x92/0x140 [ 31.962424][ T8629] do_syscall_64+0x71/0x120 [ 31.969079][ T8629] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.974939][ T8629] RIP: 0033:0x469240 [ 31.978798][ T8629] Code: Bad RIP value. [ 31.982845][ T8629] RSP: 002b:000000c0000497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 31.991223][ T8629] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 31.999165][ T8629] RDX: 0000000000000080 RSI: 000000c000049840 RDI: 0000000000000003 [ 32.007118][ T8629] RBP: 000000c000049e40 R08: 0000000000000000 R09: 0000000000000000 [ 32.016968][ T8629] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 32.024920][ T8629] R13: 000000c000000f00 R14: 0000000000000002 R15: 0000000000000002 [ 32.034294][ T8629] Kernel Offset: disabled [ 32.038618][ T8629] Rebooting in 86400 seconds..