[ 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 '10.128.0.244' (ECDSA) to the list of known hosts. 2020/07/24 10:40:09 fuzzer started 2020/07/24 10:40:10 dialing manager at 10.128.0.105:33633 2020/07/24 10:40:10 syscalls: 3213 2020/07/24 10:40:10 code coverage: enabled 2020/07/24 10:40:10 comparison tracing: enabled 2020/07/24 10:40:10 extra coverage: enabled 2020/07/24 10:40:10 setuid sandbox: enabled 2020/07/24 10:40:10 namespace sandbox: enabled 2020/07/24 10:40:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/24 10:40:10 fault injection: enabled 2020/07/24 10:40:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/24 10:40:10 net packet injection: enabled 2020/07/24 10:40:10 net device setup: enabled 2020/07/24 10:40:10 concurrency sanitizer: enabled 2020/07/24 10:40:10 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/24 10:40:10 USB emulation: enabled 2020/07/24 10:40:10 suppressing KCSAN reports in functions: 'dd_has_work' 'dput' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' 'wbt_issue' 'filemap_map_pages' 'do_signal_stop' 'expire_timers' syzkaller login: [ 31.526815][ T8630] ================================================================== [ 31.534898][ T8630] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 31.542154][ T8630] [ 31.544454][ T8630] write to 0xffff888120e30e90 of 8 bytes by interrupt on cpu 0: [ 31.552148][ T8630] ep_poll_callback+0x29c/0x510 [ 31.556970][ T8630] __wake_up_common+0xbc/0x130 [ 31.561699][ T8630] __wake_up_sync_key+0x83/0xc0 [ 31.566518][ T8630] sock_def_readable+0x61/0xe0 [ 31.571269][ T8630] tcp_rcv_established+0x13c0/0x1520 [ 31.576536][ T8630] tcp_v4_do_rcv+0x25e/0x480 [ 31.581096][ T8630] tcp_v4_rcv+0x219b/0x2420 [ 31.585652][ T8630] ip_protocol_deliver_rcu+0x1f9/0x400 [ 31.591076][ T8630] ip_local_deliver+0x1d6/0x2a0 [ 31.595897][ T8630] ip_sublist_rcv+0x4d4/0x5a0 [ 31.600547][ T8630] ip_list_rcv+0x262/0x290 [ 31.604934][ T8630] __netif_receive_skb_list_core+0x34b/0x450 [ 31.610882][ T8630] __netif_receive_skb_list+0x298/0x310 [ 31.616482][ T8630] netif_receive_skb_list_internal+0xda/0x330 [ 31.622612][ T8630] napi_gro_receive+0x329/0x5a0 [ 31.627445][ T8630] receive_buf+0x7a4/0xcf0 [ 31.631828][ T8630] virtnet_poll+0x2fa/0x780 [ 31.636298][ T8630] napi_poll+0x178/0x4a0 [ 31.640509][ T8630] net_rx_action+0x1ba/0x530 [ 31.645063][ T8630] __do_softirq+0x198/0x360 [ 31.649537][ T8630] run_ksoftirqd+0x2f/0x60 [ 31.653925][ T8630] smpboot_thread_fn+0x347/0x530 [ 31.658846][ T8630] kthread+0x20d/0x230 [ 31.662897][ T8630] ret_from_fork+0x1f/0x30 [ 31.667273][ T8630] [ 31.669571][ T8630] read to 0xffff888120e30e90 of 8 bytes by task 8630 on cpu 1: [ 31.677098][ T8630] do_epoll_wait+0x2e2/0x870 [ 31.681654][ T8630] __x64_sys_epoll_pwait+0x92/0x150 [ 31.686817][ T8630] do_syscall_64+0x51/0xb0 [ 31.691201][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.697072][ T8630] [ 31.699370][ T8630] Reported by Kernel Concurrency Sanitizer on: [ 31.705492][ T8630] CPU: 1 PID: 8630 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 31.713705][ T8630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.723725][ T8630] ================================================================== [ 31.731751][ T8630] Kernel panic - not syncing: panic_on_warn set ... [ 31.738307][ T8630] CPU: 1 PID: 8630 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 31.746507][ T8630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.756528][ T8630] Call Trace: [ 31.759807][ T8630] dump_stack+0x10f/0x19d [ 31.764102][ T8630] panic+0x207/0x64a [ 31.767969][ T8630] ? vprintk_emit+0x44a/0x4f0 [ 31.772617][ T8630] kcsan_report+0x684/0x690 [ 31.777094][ T8630] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 31.782607][ T8630] ? do_epoll_wait+0x2e2/0x870 [ 31.787338][ T8630] ? __x64_sys_epoll_pwait+0x92/0x150 [ 31.792675][ T8630] ? do_syscall_64+0x51/0xb0 [ 31.797236][ T8630] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.803278][ T8630] ? debug_smp_processor_id+0x18/0x20 [ 31.808623][ T8630] kcsan_setup_watchpoint+0x453/0x4d0 [ 31.813963][ T8630] do_epoll_wait+0x2e2/0x870 [ 31.818526][ T8630] ? debug_smp_processor_id+0x18/0x20 [ 31.823866][ T8630] __x64_sys_epoll_pwait+0x92/0x150 [ 31.829029][ T8630] do_syscall_64+0x51/0xb0 [ 31.833420][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.839279][ T8630] RIP: 0033:0x469240 [ 31.843140][ T8630] Code: Bad RIP value. [ 31.847169][ T8630] RSP: 002b:000000c00004b7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 31.855546][ T8630] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 31.863488][ T8630] RDX: 0000000000000080 RSI: 000000c00004b840 RDI: 0000000000000003 [ 31.871427][ T8630] RBP: 000000c00004be40 R08: 0000000000000000 R09: 0000000000000000 [ 31.879369][ T8630] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 31.887312][ T8630] R13: 000000c000001500 R14: 0000000000000004 R15: 0000000000000002 [ 31.896381][ T8630] Kernel Offset: disabled [ 31.900687][ T8630] Rebooting in 86400 seconds..