[ 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 '10.128.0.138' (ECDSA) to the list of known hosts. 2020/07/29 06:32:42 fuzzer started 2020/07/29 06:32:42 dialing manager at 10.128.0.105:44741 2020/07/29 06:32:43 syscalls: 3224 2020/07/29 06:32:43 code coverage: enabled 2020/07/29 06:32:43 comparison tracing: enabled 2020/07/29 06:32:43 extra coverage: enabled 2020/07/29 06:32:43 setuid sandbox: enabled 2020/07/29 06:32:43 namespace sandbox: enabled 2020/07/29 06:32:43 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/29 06:32:43 fault injection: enabled 2020/07/29 06:32:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/29 06:32:43 net packet injection: enabled 2020/07/29 06:32:43 net device setup: enabled 2020/07/29 06:32:43 concurrency sanitizer: enabled 2020/07/29 06:32:43 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/29 06:32:43 USB emulation: enabled 2020/07/29 06:32:43 suppressing KCSAN reports in functions: 'ext4_writepages' 'blk_mq_dispatch_rq_list' '__mod_timer' 'shmem_file_read_iter' 'kauditd_thread' '__xa_clear_mark' 'ext4_free_inode' syzkaller login: [ 32.322516][ T8630] ================================================================== [ 32.330630][ T8630] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 32.337876][ T8630] [ 32.340175][ T8630] write to 0xffff888120d91350 of 8 bytes by interrupt on cpu 1: [ 32.347778][ T8630] ep_poll_callback+0x29c/0x510 [ 32.352599][ T8630] __wake_up_common+0xbc/0x130 [ 32.357332][ T8630] __wake_up_sync_key+0x83/0xc0 [ 32.362155][ T8630] sock_def_readable+0x61/0xe0 [ 32.366901][ T8630] tcp_data_queue+0x1b71/0x3160 [ 32.371723][ T8630] tcp_rcv_established+0x667/0x1520 [ 32.376931][ T8630] tcp_v4_do_rcv+0x25e/0x480 [ 32.381510][ T8630] tcp_v4_rcv+0x219b/0x2420 [ 32.386264][ T8630] ip_protocol_deliver_rcu+0x1f9/0x400 [ 32.391696][ T8630] ip_local_deliver+0x1d6/0x2a0 [ 32.396612][ T8630] ip_sublist_rcv+0x4d4/0x5a0 [ 32.401260][ T8630] ip_list_rcv+0x262/0x290 [ 32.405824][ T8630] __netif_receive_skb_list_core+0x34b/0x450 [ 32.411775][ T8630] __netif_receive_skb_list+0x298/0x310 [ 32.417730][ T8630] netif_receive_skb_list_internal+0xda/0x330 [ 32.423774][ T8630] napi_gro_receive+0x329/0x5a0 [ 32.428609][ T8630] receive_buf+0x7a4/0xcf0 [ 32.432995][ T8630] virtnet_poll+0x2fa/0x780 [ 32.437468][ T8630] napi_poll+0x178/0x4a0 [ 32.441690][ T8630] net_rx_action+0x1ba/0x530 [ 32.446250][ T8630] __do_softirq+0x198/0x360 [ 32.450725][ T8630] asm_call_on_stack+0xf/0x20 [ 32.455372][ T8630] do_softirq_own_stack+0x5d/0x80 [ 32.460561][ T8630] __irq_exit_rcu+0x115/0x120 [ 32.465220][ T8630] common_interrupt+0x14e/0x1e0 [ 32.470042][ T8630] asm_common_interrupt+0x1e/0x40 [ 32.475031][ T8630] [ 32.477336][ T8630] read to 0xffff888120d91350 of 8 bytes by task 8630 on cpu 0: [ 32.484848][ T8630] do_epoll_wait+0x2e2/0x870 [ 32.489409][ T8630] __x64_sys_epoll_pwait+0x92/0x150 [ 32.494591][ T8630] do_syscall_64+0x51/0xb0 [ 32.498982][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.504845][ T8630] [ 32.507164][ T8630] Reported by Kernel Concurrency Sanitizer on: [ 32.513479][ T8630] CPU: 0 PID: 8630 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 32.521689][ T8630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.532445][ T8630] ================================================================== [ 32.540796][ T8630] Kernel panic - not syncing: panic_on_warn set ... [ 32.547368][ T8630] CPU: 0 PID: 8630 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 32.555664][ T8630] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.565775][ T8630] Call Trace: [ 32.569041][ T8630] dump_stack+0x10f/0x19d [ 32.573344][ T8630] panic+0x207/0x64a [ 32.577212][ T8630] ? vprintk_emit+0x44a/0x4f0 [ 32.581861][ T8630] kcsan_report+0x684/0x690 [ 32.586336][ T8630] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 32.591949][ T8630] ? do_epoll_wait+0x2e2/0x870 [ 32.596685][ T8630] ? __x64_sys_epoll_pwait+0x92/0x150 [ 32.602028][ T8630] ? do_syscall_64+0x51/0xb0 [ 32.606593][ T8630] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.612658][ T8630] ? ep_send_events_proc+0x4fd/0x620 [ 32.617937][ T8630] kcsan_setup_watchpoint+0x453/0x4d0 [ 32.623280][ T8630] do_epoll_wait+0x2e2/0x870 [ 32.627844][ T8630] ? debug_smp_processor_id+0x18/0x20 [ 32.633185][ T8630] __x64_sys_epoll_pwait+0x92/0x150 [ 32.638353][ T8630] do_syscall_64+0x51/0xb0 [ 32.642760][ T8630] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 32.648622][ T8630] RIP: 0033:0x469240 [ 32.652497][ T8630] 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 [ 32.672159][ T8630] RSP: 002b:000000c00004f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 32.680540][ T8630] RAX: ffffffffffffffda RBX: 00000000000493bc RCX: 0000000000469240 [ 32.688743][ T8630] RDX: 0000000000000080 RSI: 000000c00004f840 RDI: 0000000000000003 [ 32.696717][ T8630] RBP: 000000c00004fe40 R08: 0000000000000000 R09: 0000000000000000 [ 32.705615][ T8630] R10: 00000000000493bc R11: 0000000000000246 R12: 0000000000000003 [ 32.713563][ T8630] R13: 000000c000000900 R14: 0000000000000045 R15: ffffffffffffffff [ 32.722738][ T8630] Kernel Offset: disabled [ 32.727094][ T8630] Rebooting in 86400 seconds..