[ 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 '10.128.0.169' (ECDSA) to the list of known hosts. 2020/07/23 15:35:41 fuzzer started 2020/07/23 15:35:41 dialing manager at 10.128.0.105:44987 2020/07/23 15:35:41 syscalls: 3213 2020/07/23 15:35:41 code coverage: enabled 2020/07/23 15:35:41 comparison tracing: enabled 2020/07/23 15:35:41 extra coverage: enabled 2020/07/23 15:35:41 setuid sandbox: enabled 2020/07/23 15:35:41 namespace sandbox: enabled 2020/07/23 15:35:41 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/23 15:35:41 fault injection: enabled 2020/07/23 15:35:41 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/23 15:35:41 net packet injection: enabled 2020/07/23 15:35:41 net device setup: enabled 2020/07/23 15:35:41 concurrency sanitizer: enabled 2020/07/23 15:35:41 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/23 15:35:41 USB emulation: enabled 2020/07/23 15:35:42 suppressing KCSAN reports in functions: 'expire_timers' 'dd_has_work' '__xa_clear_mark' 'ext4_free_inode' 'vfs_readlink' 'find_get_pages_range_tag' syzkaller login: [ 33.997918][ T8631] ================================================================== [ 34.006042][ T8631] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 34.013308][ T8631] [ 34.015632][ T8631] write to 0xffff888120fc8e90 of 8 bytes by interrupt on cpu 0: [ 34.023254][ T8631] ep_poll_callback+0x29c/0x510 [ 34.028090][ T8631] __wake_up_common+0xbc/0x130 [ 34.032840][ T8631] __wake_up_sync_key+0x83/0xc0 [ 34.037677][ T8631] sock_def_readable+0x61/0xe0 [ 34.042426][ T8631] tcp_rcv_established+0x13c0/0x1520 [ 34.047696][ T8631] tcp_v4_do_rcv+0x25e/0x480 [ 34.052268][ T8631] tcp_v4_rcv+0x219b/0x2420 [ 34.056753][ T8631] ip_protocol_deliver_rcu+0x1f9/0x400 [ 34.062199][ T8631] ip_local_deliver+0x1d6/0x2a0 [ 34.067040][ T8631] ip_sublist_rcv+0x4d4/0x5a0 [ 34.071697][ T8631] ip_list_rcv+0x262/0x290 [ 34.076110][ T8631] __netif_receive_skb_list_core+0x34b/0x450 [ 34.082074][ T8631] __netif_receive_skb_list+0x298/0x310 [ 34.087619][ T8631] netif_receive_skb_list_internal+0xda/0x330 [ 34.093667][ T8631] napi_gro_receive+0x329/0x5a0 [ 34.098512][ T8631] receive_buf+0x7a4/0xcf0 [ 34.102909][ T8631] virtnet_poll+0x2fa/0x780 [ 34.107396][ T8631] napi_poll+0x178/0x4a0 [ 34.111644][ T8631] net_rx_action+0x1ba/0x530 [ 34.116226][ T8631] __do_softirq+0x198/0x360 [ 34.120715][ T8631] run_ksoftirqd+0x2f/0x60 [ 34.125120][ T8631] smpboot_thread_fn+0x347/0x530 [ 34.130040][ T8631] kthread+0x20d/0x230 [ 34.134104][ T8631] ret_from_fork+0x1f/0x30 [ 34.138523][ T8631] [ 34.140838][ T8631] read to 0xffff888120fc8e90 of 8 bytes by task 8631 on cpu 1: [ 34.148364][ T8631] do_epoll_wait+0x2e2/0x870 [ 34.152947][ T8631] __x64_sys_epoll_pwait+0x92/0x150 [ 34.158148][ T8631] do_syscall_64+0x51/0xb0 [ 34.162553][ T8631] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.168417][ T8631] [ 34.170724][ T8631] Reported by Kernel Concurrency Sanitizer on: [ 34.176860][ T8631] CPU: 1 PID: 8631 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 34.185078][ T8631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.195141][ T8631] ================================================================== [ 34.203189][ T8631] Kernel panic - not syncing: panic_on_warn set ... [ 34.209769][ T8631] CPU: 1 PID: 8631 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 34.218010][ T8631] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.228056][ T8631] Call Trace: [ 34.231342][ T8631] dump_stack+0x10f/0x19d [ 34.235657][ T8631] panic+0x207/0x64a [ 34.239541][ T8631] ? vprintk_emit+0x44a/0x4f0 [ 34.244210][ T8631] kcsan_report+0x684/0x690 [ 34.248705][ T8631] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 34.254270][ T8631] ? do_epoll_wait+0x2e2/0x870 [ 34.259022][ T8631] ? __x64_sys_epoll_pwait+0x92/0x150 [ 34.264465][ T8631] ? do_syscall_64+0x51/0xb0 [ 34.269060][ T8631] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.275134][ T8631] ? ep_send_events_proc+0x4fd/0x620 [ 34.280410][ T8631] kcsan_setup_watchpoint+0x453/0x4d0 [ 34.285776][ T8631] do_epoll_wait+0x2e2/0x870 [ 34.290360][ T8631] ? debug_smp_processor_id+0x18/0x20 [ 34.295720][ T8631] __x64_sys_epoll_pwait+0x92/0x150 [ 34.300909][ T8631] do_syscall_64+0x51/0xb0 [ 34.305317][ T8631] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.311193][ T8631] RIP: 0033:0x469240 [ 34.315077][ T8631] Code: Bad RIP value. [ 34.321394][ T8631] RSP: 002b:000000c0000ad7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 34.329821][ T8631] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 34.337781][ T8631] RDX: 0000000000000080 RSI: 000000c0000ad840 RDI: 0000000000000003 [ 34.345762][ T8631] RBP: 000000c0000ade40 R08: 0000000000000000 R09: 0000000000000000 [ 34.353724][ T8631] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 34.361700][ T8631] R13: 000000c00009e180 R14: 0000004dc20fedde R15: 0000000000000004 [ 34.370661][ T8631] Kernel Offset: disabled [ 34.375115][ T8631] Rebooting in 86400 seconds..