[ OK ] Started System Logging Service. [ 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 '10.128.15.196' (ECDSA) to the list of known hosts. 2020/07/17 00:18:53 fuzzer started 2020/07/17 00:18:53 dialing manager at 10.128.0.105:42479 2020/07/17 00:18:54 syscalls: 3189 2020/07/17 00:18:54 code coverage: enabled 2020/07/17 00:18:54 comparison tracing: enabled 2020/07/17 00:18:54 extra coverage: enabled 2020/07/17 00:18:54 setuid sandbox: enabled 2020/07/17 00:18:54 namespace sandbox: enabled 2020/07/17 00:18:54 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/17 00:18:54 fault injection: enabled 2020/07/17 00:18:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/17 00:18:54 net packet injection: enabled 2020/07/17 00:18:54 net device setup: enabled 2020/07/17 00:18:54 concurrency sanitizer: enabled 2020/07/17 00:18:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/17 00:18:54 USB emulation: enabled 2020/07/17 00:18:54 suppressing KCSAN reports in functions: 'do_nanosleep' '__ext4_new_inode' 'generic_write_end' '__xa_clear_mark' 'ext4_mb_find_by_goal' 'pcpu_alloc' 'find_get_pages_range_tag' syzkaller login: [ 33.028012][ T8668] ================================================================== [ 33.036155][ T8668] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 33.043444][ T8668] [ 33.045787][ T8668] write to 0xffff888124d0e110 of 8 bytes by interrupt on cpu 1: [ 33.053434][ T8668] ep_poll_callback+0x29c/0x510 [ 33.058297][ T8668] __wake_up_common+0xbc/0x130 [ 33.063058][ T8668] __wake_up_sync_key+0x83/0xc0 [ 33.067905][ T8668] sock_def_readable+0x61/0xe0 [ 33.072665][ T8668] tcp_data_queue+0x1b71/0x3160 [ 33.077533][ T8668] tcp_rcv_established+0x667/0x1520 [ 33.082732][ T8668] tcp_v4_do_rcv+0x25e/0x480 [ 33.087323][ T8668] tcp_v4_rcv+0x219b/0x2420 [ 33.091817][ T8668] ip_protocol_deliver_rcu+0x1f9/0x400 [ 33.097267][ T8668] ip_local_deliver+0x1d6/0x2a0 [ 33.102111][ T8668] ip_sublist_rcv+0x4d4/0x5a0 [ 33.106779][ T8668] ip_list_rcv+0x262/0x290 [ 33.111210][ T8668] __netif_receive_skb_list_core+0x34b/0x450 [ 33.117184][ T8668] __netif_receive_skb_list+0x298/0x310 [ 33.122733][ T8668] netif_receive_skb_list_internal+0xda/0x330 [ 33.128796][ T8668] napi_gro_receive+0x329/0x5a0 [ 33.133641][ T8668] receive_buf+0x7a4/0xcf0 [ 33.138078][ T8668] virtnet_poll+0x2fa/0x780 [ 33.142625][ T8668] napi_poll+0x178/0x4a0 [ 33.146878][ T8668] net_rx_action+0x1ba/0x530 [ 33.151487][ T8668] __do_softirq+0x198/0x360 [ 33.155990][ T8668] run_ksoftirqd+0x2f/0x60 [ 33.160412][ T8668] smpboot_thread_fn+0x347/0x530 [ 33.165353][ T8668] kthread+0x20d/0x230 [ 33.169438][ T8668] ret_from_fork+0x1f/0x30 [ 33.173838][ T8668] [ 33.176167][ T8668] read to 0xffff888124d0e110 of 8 bytes by task 8668 on cpu 0: [ 33.183710][ T8668] do_epoll_wait+0x2e2/0x870 [ 33.188297][ T8668] __x64_sys_epoll_pwait+0x92/0x150 [ 33.193497][ T8668] do_syscall_64+0x51/0xb0 [ 33.197916][ T8668] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.203795][ T8668] [ 33.206129][ T8668] Reported by Kernel Concurrency Sanitizer on: [ 33.212295][ T8668] CPU: 0 PID: 8668 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 33.220518][ T8668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.230575][ T8668] ================================================================== [ 33.238628][ T8668] Kernel panic - not syncing: panic_on_warn set ... [ 33.245252][ T8668] CPU: 0 PID: 8668 Comm: syz-fuzzer Not tainted 5.8.0-rc5-syzkaller #0 [ 33.253482][ T8668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.263631][ T8668] Call Trace: [ 33.266946][ T8668] dump_stack+0x10f/0x19d [ 33.271280][ T8668] panic+0x207/0x64a [ 33.275202][ T8668] ? vprintk_emit+0x44a/0x4f0 [ 33.279886][ T8668] kcsan_report+0x684/0x690 [ 33.284401][ T8668] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 33.289952][ T8668] ? do_epoll_wait+0x2e2/0x870 [ 33.294719][ T8668] ? __x64_sys_epoll_pwait+0x92/0x150 [ 33.300108][ T8668] ? do_syscall_64+0x51/0xb0 [ 33.304716][ T8668] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.310792][ T8668] ? ep_send_events_proc+0x4fd/0x620 [ 33.316098][ T8668] kcsan_setup_watchpoint+0x453/0x4d0 [ 33.321469][ T8668] do_epoll_wait+0x2e2/0x870 [ 33.326083][ T8668] ? debug_smp_processor_id+0x18/0x20 [ 33.331457][ T8668] __x64_sys_epoll_pwait+0x92/0x150 [ 33.336661][ T8668] do_syscall_64+0x51/0xb0 [ 33.341106][ T8668] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 33.347009][ T8668] RIP: 0033:0x469240 [ 33.350905][ T8668] Code: Bad RIP value. [ 33.355001][ T8668] RSP: 002b:00007ffcc143f730 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 33.363409][ T8668] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 33.371402][ T8668] RDX: 0000000000000080 RSI: 00007ffcc143f780 RDI: 0000000000000003 [ 33.379372][ T8668] RBP: 00007ffcc143fd80 R08: 0000000000000000 R09: 0000000000000000 [ 33.387338][ T8668] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 33.395301][ T8668] R13: 000000000178de00 R14: 000080c0009ee000 R15: 000080c000a67fff [ 33.404302][ T8668] Kernel Offset: disabled [ 33.408622][ T8668] Rebooting in 86400 seconds..