[ 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 '10.128.0.6' (ECDSA) to the list of known hosts. 2020/06/03 12:27:06 fuzzer started 2020/06/03 12:27:06 dialing manager at 10.128.0.105:40391 2020/06/03 12:27:06 syscalls: 3055 2020/06/03 12:27:06 code coverage: enabled 2020/06/03 12:27:06 comparison tracing: enabled 2020/06/03 12:27:06 extra coverage: enabled 2020/06/03 12:27:06 setuid sandbox: enabled 2020/06/03 12:27:06 namespace sandbox: enabled 2020/06/03 12:27:06 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/03 12:27:06 fault injection: enabled 2020/06/03 12:27:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/03 12:27:06 net packet injection: enabled 2020/06/03 12:27:06 net device setup: enabled 2020/06/03 12:27:06 concurrency sanitizer: enabled 2020/06/03 12:27:06 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/03 12:27:06 USB emulation: enabled syzkaller login: [ 51.221307][ T8883] ================================================================== [ 51.229435][ T8883] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 51.236288][ T8883] [ 51.238596][ T8883] write to 0xffff8881254fa050 of 8 bytes by interrupt on cpu 0: [ 51.246208][ T8883] ep_poll_callback+0x5f2/0x6c0 [ 51.251038][ T8883] __wake_up_common+0x76/0x180 [ 51.255778][ T8883] __wake_up_common_lock+0x77/0xb0 [ 51.260978][ T8883] sock_def_readable+0x9d/0x130 [ 51.265873][ T8883] tcp_data_ready+0x76/0xc0 [ 51.270418][ T8883] tcp_data_queue+0xd09/0x20a0 [ 51.275171][ T8883] tcp_rcv_established+0x4fc/0xee0 [ 51.280312][ T8883] tcp_v4_do_rcv+0x396/0x4f0 [ 51.284880][ T8883] tcp_v4_rcv+0x1c55/0x1e10 [ 51.289362][ T8883] ip_protocol_deliver_rcu+0x4b/0x410 [ 51.294711][ T8883] ip_local_deliver_finish+0xf3/0x120 [ 51.300072][ T8883] ip_local_deliver+0x135/0x220 [ 51.304934][ T8883] ip_sublist_rcv_finish+0xf0/0x140 [ 51.310128][ T8883] ip_sublist_rcv+0x3f8/0x530 [ 51.314792][ T8883] ip_list_rcv+0x2f3/0x321 [ 51.319198][ T8883] __netif_receive_skb_list_core+0x368/0x5c0 [ 51.325161][ T8883] netif_receive_skb_list_internal+0x5c7/0x810 [ 51.331291][ T8883] gro_normal_list.part.0+0x37/0xa0 [ 51.336466][ T8883] gro_normal_one+0x14c/0x160 [ 51.341136][ T8883] napi_gro_receive+0x27d/0x2f0 [ 51.345996][ T8883] receive_buf+0x24c/0x3420 [ 51.350562][ T8883] virtnet_poll+0x343/0x790 [ 51.355058][ T8883] net_rx_action+0x3ad/0xac0 [ 51.359623][ T8883] __do_softirq+0x118/0x34a [ 51.364105][ T8883] irq_exit+0xb5/0xd0 [ 51.368063][ T8883] do_IRQ+0x7b/0x120 [ 51.371935][ T8883] ret_from_intr+0x0/0x21 [ 51.376253][ T8883] __sanitizer_cov_trace_pc+0x0/0x50 [ 51.381594][ T8883] fput_many+0xe2/0x130 [ 51.385727][ T8883] fput+0x20/0x30 [ 51.389367][ T8883] ksys_read+0x17c/0x1a0 [ 51.393585][ T8883] __x64_sys_read+0x49/0x60 [ 51.398073][ T8883] do_syscall_64+0xc7/0x3b0 [ 51.402555][ T8883] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.408416][ T8883] [ 51.410727][ T8883] read to 0xffff8881254fa050 of 8 bytes by task 8883 on cpu 1: [ 51.418246][ T8883] ep_poll+0x473/0x910 [ 51.422295][ T8883] do_epoll_wait+0x15a/0x180 [ 51.426861][ T8883] __x64_sys_epoll_pwait+0xc6/0x170 [ 51.432036][ T8883] do_syscall_64+0xc7/0x3b0 [ 51.436529][ T8883] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.442389][ T8883] [ 51.444690][ T8883] Reported by Kernel Concurrency Sanitizer on: [ 51.450907][ T8883] CPU: 1 PID: 8883 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.459119][ T8883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.469152][ T8883] ================================================================== [ 51.477212][ T8883] Kernel panic - not syncing: panic_on_warn set ... [ 51.483780][ T8883] CPU: 1 PID: 8883 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 51.491989][ T8883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.502032][ T8883] Call Trace: [ 51.505324][ T8883] dump_stack+0x11d/0x187 [ 51.509634][ T8883] panic+0x210/0x640 [ 51.513508][ T8883] ? vprintk_func+0x89/0x13a [ 51.518077][ T8883] kcsan_report.cold+0xc/0x1a [ 51.522753][ T8883] kcsan_setup_watchpoint+0x3fb/0x440 [ 51.528105][ T8883] ep_poll+0x473/0x910 [ 51.532173][ T8883] ? __fget_light+0xc0/0x1a0 [ 51.536744][ T8883] do_epoll_wait+0x15a/0x180 [ 51.541314][ T8883] __x64_sys_epoll_pwait+0xc6/0x170 [ 51.546510][ T8883] do_syscall_64+0xc7/0x3b0 [ 51.551010][ T8883] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.556875][ T8883] RIP: 0033:0x469240 [ 51.560750][ T8883] 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 [ 51.580330][ T8883] RSP: 002b:000000c0000497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 51.588722][ T8883] RAX: ffffffffffffffda RBX: 00000000000002a6 RCX: 0000000000469240 [ 51.596690][ T8883] RDX: 0000000000000080 RSI: 000000c000049840 RDI: 0000000000000003 [ 51.604661][ T8883] RBP: 000000c000049e40 R08: 0000000000000000 R09: 0000000000000033 [ 51.612671][ T8883] R10: 00000000000002a6 R11: 0000000000000246 R12: 0000000000000003 [ 51.620624][ T8883] R13: 000000c000000f00 R14: 000080c000274000 R15: 000080c00027bfff [ 51.630155][ T8883] Kernel Offset: disabled [ 51.634499][ T8883] Rebooting in 86400 seconds..