[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.8' (ECDSA) to the list of known hosts. 2020/05/30 02:26:54 fuzzer started 2020/05/30 02:26:54 dialing manager at 10.128.0.105:42021 2020/05/30 02:26:54 syscalls: 3055 2020/05/30 02:26:54 code coverage: enabled 2020/05/30 02:26:54 comparison tracing: enabled 2020/05/30 02:26:54 extra coverage: enabled 2020/05/30 02:26:54 setuid sandbox: enabled 2020/05/30 02:26:54 namespace sandbox: enabled 2020/05/30 02:26:54 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/30 02:26:54 fault injection: enabled 2020/05/30 02:26:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/30 02:26:54 net packet injection: enabled 2020/05/30 02:26:54 net device setup: enabled 2020/05/30 02:26:54 concurrency sanitizer: enabled 2020/05/30 02:26:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/30 02:26:54 USB emulation: enabled 2020/05/30 02:26:55 adding functions to KCSAN blacklist: 'tick_sched_do_timer' 'find_get_pages_range_tag' '_find_next_bit' syzkaller login: [ 50.214015][ T8910] KCSAN: could not find function: '_find_next_bit' [ 51.404385][ T8899] ================================================================== [ 51.412615][ T8899] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 51.419620][ T8899] [ 51.421953][ T8899] write to 0xffff8881218c0f50 of 8 bytes by interrupt on cpu 1: [ 51.429693][ T8899] ep_poll_callback+0x5f2/0x6c0 [ 51.434587][ T8899] __wake_up_common+0x76/0x180 [ 51.439348][ T8899] __wake_up_common_lock+0x77/0xb0 [ 51.444493][ T8899] sock_def_readable+0x9d/0x130 [ 51.449330][ T8899] tcp_data_ready+0x76/0xc0 [ 51.453837][ T8899] tcp_rcv_established+0xcb8/0xee0 [ 51.458936][ T8899] tcp_v4_do_rcv+0x396/0x4f0 [ 51.463511][ T8899] tcp_v4_rcv+0x1c55/0x1e10 [ 51.468001][ T8899] ip_protocol_deliver_rcu+0x4b/0x410 [ 51.473885][ T8899] ip_local_deliver_finish+0xf3/0x120 [ 51.479346][ T8899] ip_local_deliver+0x135/0x220 [ 51.484230][ T8899] ip_sublist_rcv_finish+0xf0/0x140 [ 51.489792][ T8899] ip_sublist_rcv+0x3f8/0x530 [ 51.494982][ T8899] ip_list_rcv+0x2f3/0x321 [ 51.499418][ T8899] __netif_receive_skb_list_core+0x368/0x5c0 [ 51.505386][ T8899] netif_receive_skb_list_internal+0x5c7/0x810 [ 51.511530][ T8899] gro_normal_list.part.0+0x37/0xa0 [ 51.517242][ T8899] napi_complete_done+0x1d3/0x3a0 [ 51.522261][ T8899] virtqueue_napi_complete+0x36/0xa0 [ 51.527534][ T8899] virtnet_poll+0x771/0x790 [ 51.532026][ T8899] net_rx_action+0x3ad/0xac0 [ 51.536626][ T8899] __do_softirq+0x118/0x34a [ 51.542163][ T8899] irq_exit+0xb5/0xd0 [ 51.546131][ T8899] do_IRQ+0x7b/0x120 [ 51.550015][ T8899] ret_from_intr+0x0/0x21 [ 51.554612][ T8899] native_safe_halt+0xe/0x10 [ 51.559192][ T8899] default_idle+0x21/0x170 [ 51.563597][ T8899] do_idle+0x1b7/0x290 [ 51.567657][ T8899] cpu_startup_entry+0x14/0x20 [ 51.572414][ T8899] start_secondary+0x169/0x1b0 [ 51.577166][ T8899] secondary_startup_64+0xa4/0xb0 [ 51.582169][ T8899] [ 51.584497][ T8899] read to 0xffff8881218c0f50 of 8 bytes by task 8899 on cpu 0: [ 51.592035][ T8899] ep_poll+0x473/0x910 [ 51.596266][ T8899] do_epoll_wait+0x15a/0x180 [ 51.600883][ T8899] __x64_sys_epoll_pwait+0xc6/0x170 [ 51.606076][ T8899] do_syscall_64+0xc7/0x3b0 [ 51.610579][ T8899] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.616452][ T8899] [ 51.618812][ T8899] Reported by Kernel Concurrency Sanitizer on: [ 51.624958][ T8899] CPU: 0 PID: 8899 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.633214][ T8899] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.644078][ T8899] ================================================================== [ 51.652130][ T8899] Kernel panic - not syncing: panic_on_warn set ... [ 51.658979][ T8899] CPU: 0 PID: 8899 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.667400][ T8899] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.677911][ T8899] Call Trace: [ 51.681293][ T8899] dump_stack+0x11d/0x187 [ 51.685662][ T8899] panic+0x210/0x640 [ 51.690020][ T8899] ? vprintk_func+0x89/0x13a [ 51.694808][ T8899] kcsan_report.cold+0xc/0x1a [ 51.699569][ T8899] kcsan_setup_watchpoint+0x3fb/0x440 [ 51.705293][ T8899] ep_poll+0x473/0x910 [ 51.709368][ T8899] ? __fget_light+0xc0/0x1a0 [ 51.714425][ T8899] do_epoll_wait+0x15a/0x180 [ 51.719244][ T8899] __x64_sys_epoll_pwait+0xc6/0x170 [ 51.724441][ T8899] do_syscall_64+0xc7/0x3b0 [ 51.728980][ T8899] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.734866][ T8899] RIP: 0033:0x469240 [ 51.738787][ T8899] 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 [ 51.758957][ T8899] RSP: 002b:000000c0000497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 51.767655][ T8899] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000469240 [ 51.775763][ T8899] RDX: 0000000000000080 RSI: 000000c000049840 RDI: 0000000000000003 [ 51.783760][ T8899] RBP: 000000c000049e40 R08: 0000000000000000 R09: 00000000016ad6d8 [ 51.791722][ T8899] R10: 0000000000000002 R11: 0000000000000246 R12: 00000051d10af226 [ 51.799772][ T8899] R13: 0000000000000001 R14: 00000051d10af226 R15: 0000000000000004 [ 51.809299][ T8899] Kernel Offset: disabled [ 51.813786][ T8899] Rebooting in 86400 seconds..