[ 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 '10.128.0.15' (ECDSA) to the list of known hosts. 2020/06/07 08:50:44 fuzzer started 2020/06/07 08:50:44 dialing manager at 10.128.0.105:43689 2020/06/07 08:50:44 syscalls: 3055 2020/06/07 08:50:44 code coverage: enabled 2020/06/07 08:50:44 comparison tracing: enabled 2020/06/07 08:50:44 extra coverage: enabled 2020/06/07 08:50:44 setuid sandbox: enabled 2020/06/07 08:50:44 namespace sandbox: enabled 2020/06/07 08:50:44 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/07 08:50:44 fault injection: enabled 2020/06/07 08:50:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/07 08:50:44 net packet injection: enabled 2020/06/07 08:50:44 net device setup: enabled 2020/06/07 08:50:44 concurrency sanitizer: enabled 2020/06/07 08:50:44 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/07 08:50:44 USB emulation: enabled 2020/06/07 08:50:45 adding functions to KCSAN blacklist: 'blk_mq_dispatch_rq_list' 'generic_write_end' syzkaller login: [ 51.494213][ T8905] ================================================================== [ 51.502331][ T8905] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 51.509071][ T8905] [ 51.511404][ T8905] write to 0xffff88812a9ee110 of 8 bytes by interrupt on cpu 1: [ 51.519037][ T8905] ep_poll_callback+0x5f2/0x6c0 [ 51.523874][ T8905] __wake_up_common+0x76/0x180 [ 51.528626][ T8905] __wake_up_common_lock+0x77/0xb0 [ 51.533734][ T8905] sock_def_readable+0x9d/0x130 [ 51.538571][ T8905] tcp_data_ready+0x76/0xc0 [ 51.543062][ T8905] tcp_rcv_established+0xcb8/0xee0 [ 51.548424][ T8905] tcp_v4_do_rcv+0x396/0x4f0 [ 51.553000][ T8905] tcp_v4_rcv+0x1c55/0x1e10 [ 51.557491][ T8905] ip_protocol_deliver_rcu+0x4b/0x410 [ 51.562856][ T8905] ip_local_deliver_finish+0xf3/0x120 [ 51.568214][ T8905] ip_local_deliver+0x135/0x220 [ 51.573054][ T8905] ip_sublist_rcv_finish+0xf0/0x140 [ 51.578237][ T8905] ip_sublist_rcv+0x3f8/0x530 [ 51.582987][ T8905] ip_list_rcv+0x2f3/0x321 [ 51.587394][ T8905] __netif_receive_skb_list_core+0x368/0x5c0 [ 51.593364][ T8905] netif_receive_skb_list_internal+0x5c7/0x810 [ 51.599543][ T8905] gro_normal_list.part.0+0x37/0xa0 [ 51.604727][ T8905] gro_normal_one+0x14c/0x160 [ 51.609391][ T8905] napi_gro_receive+0x27d/0x2f0 [ 51.614230][ T8905] receive_buf+0x24c/0x3420 [ 51.618720][ T8905] virtnet_poll+0x343/0x790 [ 51.623239][ T8905] net_rx_action+0x3ad/0xac0 [ 51.627819][ T8905] __do_softirq+0x118/0x34a [ 51.632316][ T8905] run_ksoftirqd+0x41/0x60 [ 51.636727][ T8905] smpboot_thread_fn+0x374/0x4a0 [ 51.641651][ T8905] kthread+0x203/0x230 [ 51.645707][ T8905] ret_from_fork+0x1f/0x30 [ 51.650100][ T8905] [ 51.652417][ T8905] read to 0xffff88812a9ee110 of 8 bytes by task 8905 on cpu 0: [ 51.659953][ T8905] ep_poll+0x473/0x910 [ 51.664006][ T8905] do_epoll_wait+0x15a/0x180 [ 51.668669][ T8905] __x64_sys_epoll_pwait+0xc6/0x170 [ 51.673859][ T8905] do_syscall_64+0xc7/0x3b0 [ 51.678371][ T8905] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.684239][ T8905] [ 51.686547][ T8905] Reported by Kernel Concurrency Sanitizer on: [ 51.692686][ T8905] CPU: 0 PID: 8905 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.700902][ T8905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.710939][ T8905] ================================================================== [ 51.718986][ T8905] Kernel panic - not syncing: panic_on_warn set ... [ 51.725561][ T8905] CPU: 0 PID: 8905 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.733778][ T8905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.743826][ T8905] Call Trace: [ 51.747110][ T8905] dump_stack+0x11d/0x187 [ 51.751431][ T8905] panic+0x210/0x640 [ 51.755318][ T8905] ? vprintk_func+0x89/0x13a [ 51.759899][ T8905] kcsan_report.cold+0xc/0x1a [ 51.764572][ T8905] kcsan_setup_watchpoint+0x3fb/0x440 [ 51.769932][ T8905] ep_poll+0x473/0x910 [ 51.773999][ T8905] ? __fget_light+0xc0/0x1a0 [ 51.778580][ T8905] do_epoll_wait+0x15a/0x180 [ 51.783162][ T8905] __x64_sys_epoll_pwait+0xc6/0x170 [ 51.788361][ T8905] do_syscall_64+0xc7/0x3b0 [ 51.792868][ T8905] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.798745][ T8905] RIP: 0033:0x469240 [ 51.802717][ T8905] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 51.822483][ T8905] RSP: 002b:00007ffc72a7bb10 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 51.830878][ T8905] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 51.838839][ T8905] RDX: 0000000000000080 RSI: 00007ffc72a7bb60 RDI: 0000000000000003 [ 51.846797][ T8905] RBP: 00007ffc72a7c160 R08: 0000000000000000 R09: 0000000000000000 [ 51.854842][ T8905] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 51.862802][ T8905] R13: 0000000001682bc0 R14: 0000000000000008 R15: 0000000000000002 [ 51.872307][ T8905] Kernel Offset: disabled [ 51.876639][ T8905] Rebooting in 86400 seconds..