[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. [ 21.570034][ C1] random: crng init done [ 21.574278][ C1] random: 7 urandom warning(s) missed due to ratelimiting Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.35' (ECDSA) to the list of known hosts. 2020/08/02 21:12:12 fuzzer started 2020/08/02 21:12:13 dialing manager at 10.128.0.105:36883 2020/08/02 21:12:13 syscalls: 3254 2020/08/02 21:12:13 code coverage: enabled 2020/08/02 21:12:13 comparison tracing: enabled 2020/08/02 21:12:13 extra coverage: enabled 2020/08/02 21:12:13 setuid sandbox: enabled 2020/08/02 21:12:13 namespace sandbox: enabled 2020/08/02 21:12:13 Android sandbox: /sys/fs/selinux/policy does not exist 2020/08/02 21:12:13 fault injection: enabled 2020/08/02 21:12:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/08/02 21:12:13 net packet injection: enabled 2020/08/02 21:12:13 net device setup: enabled 2020/08/02 21:12:13 concurrency sanitizer: enabled 2020/08/02 21:12:13 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/08/02 21:12:13 USB emulation: enabled 2020/08/02 21:12:13 hci packet injection: enabled 2020/08/02 21:12:13 suppressing KCSAN reports in functions: 'ext4_writepages' 'generic_file_buffered_read' 'ext4_free_inodes_count' 'alloc_pid' '__xa_clear_mark' syzkaller login: [ 31.400429][ T8638] ================================================================== [ 31.408512][ T8638] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 31.415772][ T8638] [ 31.418103][ T8638] write to 0xffff888124e7db90 of 8 bytes by interrupt on cpu 0: [ 31.425719][ T8638] ep_poll_callback+0x29c/0x510 [ 31.430536][ T8638] __wake_up_common+0xbc/0x130 [ 31.435267][ T8638] __wake_up_sync_key+0x83/0xc0 [ 31.440114][ T8638] sock_def_readable+0x61/0xe0 [ 31.444844][ T8638] tcp_rcv_established+0x13c0/0x1520 [ 31.450101][ T8638] tcp_v4_do_rcv+0x25e/0x480 [ 31.454663][ T8638] tcp_v4_rcv+0x219b/0x2420 [ 31.459502][ T8638] ip_protocol_deliver_rcu+0x1f9/0x400 [ 31.464927][ T8638] ip_local_deliver+0x1d6/0x2a0 [ 31.469741][ T8638] ip_sublist_rcv+0x4d4/0x5a0 [ 31.474383][ T8638] ip_list_rcv+0x262/0x290 [ 31.478783][ T8638] __netif_receive_skb_list_core+0x34b/0x450 [ 31.484728][ T8638] __netif_receive_skb_list+0x298/0x310 [ 31.490255][ T8638] netif_receive_skb_list_internal+0xda/0x330 [ 31.496305][ T8638] napi_complete_done+0x1a1/0x3c0 [ 31.501299][ T8638] virtqueue_napi_complete+0x28/0x80 [ 31.506548][ T8638] virtnet_poll+0x64f/0x780 [ 31.511035][ T8638] napi_poll+0x178/0x4a0 [ 31.515247][ T8638] net_rx_action+0x1ba/0x530 [ 31.519806][ T8638] __do_softirq+0x198/0x360 [ 31.524278][ T8638] run_ksoftirqd+0x2f/0x60 [ 31.528663][ T8638] smpboot_thread_fn+0x347/0x530 [ 31.533569][ T8638] kthread+0x20d/0x230 [ 31.537610][ T8638] ret_from_fork+0x1f/0x30 [ 31.541990][ T8638] [ 31.544307][ T8638] read to 0xffff888124e7db90 of 8 bytes by task 8638 on cpu 1: [ 31.551821][ T8638] do_epoll_wait+0x2e2/0x870 [ 31.556392][ T8638] __x64_sys_epoll_pwait+0x92/0x150 [ 31.561557][ T8638] do_syscall_64+0x51/0xb0 [ 31.565941][ T8638] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.571793][ T8638] [ 31.574087][ T8638] Reported by Kernel Concurrency Sanitizer on: [ 31.580209][ T8638] CPU: 1 PID: 8638 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 31.588408][ T8638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.598443][ T8638] ================================================================== [ 31.606470][ T8638] Kernel panic - not syncing: panic_on_warn set ... [ 31.613026][ T8638] CPU: 1 PID: 8638 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 31.621227][ T8638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.631249][ T8638] Call Trace: [ 31.634525][ T8638] dump_stack+0x10f/0x19d [ 31.638837][ T8638] panic+0x207/0x64a [ 31.642703][ T8638] ? vprintk_emit+0x44a/0x4f0 [ 31.647402][ T8638] kcsan_report+0x684/0x690 [ 31.651878][ T8638] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 31.657392][ T8638] ? do_epoll_wait+0x2e2/0x870 [ 31.662123][ T8638] ? __x64_sys_epoll_pwait+0x92/0x150 [ 31.667723][ T8638] ? do_syscall_64+0x51/0xb0 [ 31.672282][ T8638] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.678339][ T8638] ? ep_send_events_proc+0x4fd/0x620 [ 31.683596][ T8638] kcsan_setup_watchpoint+0x453/0x4d0 [ 31.688937][ T8638] do_epoll_wait+0x2e2/0x870 [ 31.693496][ T8638] ? debug_smp_processor_id+0x18/0x20 [ 31.698839][ T8638] __x64_sys_epoll_pwait+0x92/0x150 [ 31.704007][ T8638] do_syscall_64+0x51/0xb0 [ 31.708416][ T8638] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 31.714273][ T8638] RIP: 0033:0x469240 [ 31.718141][ T8638] 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 [ 31.737753][ T8638] RSP: 002b:00007ffe94642c80 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 31.746240][ T8638] RAX: ffffffffffffffda RBX: 0000000000000143 RCX: 0000000000469240 [ 31.754183][ T8638] RDX: 0000000000000080 RSI: 00007ffe94642cd0 RDI: 0000000000000003 [ 31.762126][ T8638] RBP: 00007ffe946432d0 R08: 0000000000000000 R09: 0000000000000000 [ 31.770068][ T8638] R10: 0000000000000143 R11: 0000000000000246 R12: 0000000000000003 [ 31.778011][ T8638] R13: 00000000017e0380 R14: 0000000000000008 R15: 0000000000000004 [ 31.786973][ T8638] Kernel Offset: disabled [ 31.791279][ T8638] Rebooting in 86400 seconds..