[ OK ] Started OpenBSD Secure Shell server. [ 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 syzkaller login: [ 24.817876][ T8615] sshd (8615) used greatest stack depth: 10408 bytes left Warning: Permanently added '10.128.0.189' (ECDSA) to the list of known hosts. 2020/08/03 10:39:25 fuzzer started 2020/08/03 10:39:26 dialing manager at 10.128.0.105:43227 2020/08/03 10:39:26 syscalls: 3254 2020/08/03 10:39:26 code coverage: enabled 2020/08/03 10:39:26 comparison tracing: enabled 2020/08/03 10:39:26 extra coverage: enabled 2020/08/03 10:39:26 setuid sandbox: enabled 2020/08/03 10:39:26 namespace sandbox: enabled 2020/08/03 10:39:26 Android sandbox: /sys/fs/selinux/policy does not exist 2020/08/03 10:39:26 fault injection: enabled 2020/08/03 10:39:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/08/03 10:39:26 net packet injection: enabled 2020/08/03 10:39:26 net device setup: enabled 2020/08/03 10:39:26 concurrency sanitizer: enabled 2020/08/03 10:39:26 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/08/03 10:39:26 USB emulation: enabled 2020/08/03 10:39:26 hci packet injection: enabled 2020/08/03 10:39:26 suppressing KCSAN reports in functions: 'generic_file_buffered_read' '__xa_clear_mark' [ 32.228294][ T8653] ================================================================== [ 32.236412][ T8653] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 32.243669][ T8653] [ 32.245990][ T8653] write to 0xffff888120e76050 of 8 bytes by interrupt on cpu 1: [ 32.258915][ T8653] ep_poll_callback+0x29c/0x510 [ 32.263759][ T8653] __wake_up_common+0xbc/0x130 [ 32.268506][ T8653] __wake_up_sync_key+0x83/0xc0 [ 32.274118][ T8653] sock_def_readable+0x61/0xe0 [ 32.280429][ T8653] tcp_rcv_established+0x13c0/0x1520 [ 32.285957][ T8653] tcp_v4_do_rcv+0x25e/0x480 [ 32.290531][ T8653] tcp_v4_rcv+0x219b/0x2420 [ 32.295018][ T8653] ip_protocol_deliver_rcu+0x1f9/0x400 [ 32.300466][ T8653] ip_local_deliver+0x1d6/0x2a0 [ 32.305423][ T8653] ip_sublist_rcv+0x4d4/0x5a0 [ 32.310125][ T8653] ip_list_rcv+0x262/0x290 [ 32.314544][ T8653] __netif_receive_skb_list_core+0x34b/0x450 [ 32.320531][ T8653] __netif_receive_skb_list+0x298/0x310 [ 32.326066][ T8653] netif_receive_skb_list_internal+0xda/0x330 [ 32.332121][ T8653] napi_gro_receive+0x329/0x5a0 [ 32.337595][ T8653] receive_buf+0x7a4/0xcf0 [ 32.341994][ T8653] virtnet_poll+0x2fa/0x780 [ 32.346498][ T8653] napi_poll+0x178/0x4a0 [ 32.350727][ T8653] net_rx_action+0x1ba/0x530 [ 32.355303][ T8653] __do_softirq+0x198/0x360 [ 32.359793][ T8653] asm_call_on_stack+0xf/0x20 [ 32.364455][ T8653] do_softirq_own_stack+0x5d/0x80 [ 32.369466][ T8653] __irq_exit_rcu+0x115/0x120 [ 32.374133][ T8653] common_interrupt+0x14e/0x1e0 [ 32.378983][ T8653] asm_common_interrupt+0x1e/0x40 [ 32.383984][ T8653] [ 32.386302][ T8653] read to 0xffff888120e76050 of 8 bytes by task 8653 on cpu 0: [ 32.393838][ T8653] do_epoll_wait+0x2e2/0x870 [ 32.398778][ T8653] __x64_sys_epoll_pwait+0x92/0x150 [ 32.403957][ T8653] do_syscall_64+0x51/0xb0 [ 32.408360][ T8653] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.414225][ T8653] [ 32.416530][ T8653] Reported by Kernel Concurrency Sanitizer on: [ 32.422668][ T8653] CPU: 0 PID: 8653 Comm: syz-fuzzer Not tainted 5.8.0-syzkaller #0 [ 32.431489][ T8653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.441530][ T8653] ================================================================== [ 32.450709][ T8653] Kernel panic - not syncing: panic_on_warn set ... [ 32.457292][ T8653] CPU: 0 PID: 8653 Comm: syz-fuzzer Not tainted 5.8.0-syzkaller #0 [ 32.465164][ T8653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.475228][ T8653] Call Trace: [ 32.478625][ T8653] dump_stack+0x10f/0x19d [ 32.482944][ T8653] panic+0x207/0x64a [ 32.495309][ T8653] ? vprintk_emit+0x44a/0x4f0 [ 32.499975][ T8653] kcsan_report+0x684/0x690 [ 32.504468][ T8653] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 32.510029][ T8653] ? do_epoll_wait+0x2e2/0x870 [ 32.514792][ T8653] ? __x64_sys_epoll_pwait+0x92/0x150 [ 32.520153][ T8653] ? do_syscall_64+0x51/0xb0 [ 32.524751][ T8653] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.530816][ T8653] ? ep_send_events_proc+0x4fd/0x620 [ 32.536105][ T8653] kcsan_setup_watchpoint+0x453/0x4d0 [ 32.541479][ T8653] do_epoll_wait+0x2e2/0x870 [ 32.546060][ T8653] ? debug_smp_processor_id+0x18/0x20 [ 32.551421][ T8653] __x64_sys_epoll_pwait+0x92/0x150 [ 32.556604][ T8653] do_syscall_64+0x51/0xb0 [ 32.561023][ T8653] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.566923][ T8653] RIP: 0033:0x469240 [ 32.570804][ T8653] 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 [ 32.590418][ T8653] RSP: 002b:000000c0001077f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 32.598840][ T8653] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 32.606806][ T8653] RDX: 0000000000000080 RSI: 000000c000107840 RDI: 0000000000000003 [ 32.614778][ T8653] RBP: 000000c000107e40 R08: 0000000000000000 R09: 0000000000000000 [ 32.622826][ T8653] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 32.630792][ T8653] R13: 000000c00015e300 R14: 0000004d58346537 R15: 0000000000000002 [ 32.639891][ T8653] Kernel Offset: disabled [ 32.644236][ T8653] Rebooting in 86400 seconds..