[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.
[   21.770531][    C0] random: crng init done
[   21.774793][    C0] random: 7 urandom warning(s) missed due to ratelimiting


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts.
2020/07/22 13:54:10 fuzzer started
2020/07/22 13:54:10 dialing manager at 10.128.0.105:37525
2020/07/22 13:54:11 syscalls: 3214
2020/07/22 13:54:11 code coverage: enabled
2020/07/22 13:54:11 comparison tracing: enabled
2020/07/22 13:54:11 extra coverage: enabled
2020/07/22 13:54:11 setuid sandbox: enabled
2020/07/22 13:54:11 namespace sandbox: enabled
2020/07/22 13:54:11 Android sandbox: /sys/fs/selinux/policy does not exist
2020/07/22 13:54:11 fault injection: enabled
2020/07/22 13:54:11 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/07/22 13:54:11 net packet injection: enabled
2020/07/22 13:54:11 net device setup: enabled
2020/07/22 13:54:11 concurrency sanitizer: enabled
2020/07/22 13:54:11 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/07/22 13:54:11 USB emulation: enabled
2020/07/22 13:54:11 suppressing KCSAN reports in functions: 'generic_write_end' '__delayacct_blkio_end' 
syzkaller login: [   31.419195][ T8640] ==================================================================
[   31.427327][ T8640] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback
[   31.434699][ T8640] 
[   31.437030][ T8640] write to 0xffff888124ebea10 of 8 bytes by interrupt on cpu 1:
[   31.444655][ T8640]  ep_poll_callback+0x29c/0x510
[   31.449499][ T8640]  __wake_up_common+0xbc/0x130
[   31.454231][ T8640]  __wake_up_sync_key+0x83/0xc0
[   31.459064][ T8640]  sock_def_readable+0x61/0xe0
[   31.463799][ T8640]  tcp_rcv_established+0x13c0/0x1520
[   31.469064][ T8640]  tcp_v4_do_rcv+0x25e/0x480
[   31.473625][ T8640]  tcp_v4_rcv+0x219b/0x2420
[   31.478112][ T8640]  ip_protocol_deliver_rcu+0x1f9/0x400
[   31.483541][ T8640]  ip_local_deliver+0x1d6/0x2a0
[   31.488365][ T8640]  ip_sublist_rcv+0x4d4/0x5a0
[   31.493013][ T8640]  ip_list_rcv+0x262/0x290
[   31.497403][ T8640]  __netif_receive_skb_list_core+0x34b/0x450
[   31.503367][ T8640]  __netif_receive_skb_list+0x298/0x310
[   31.508903][ T8640]  netif_receive_skb_list_internal+0xda/0x330
[   31.514964][ T8640]  napi_complete_done+0x1a1/0x3c0
[   31.519972][ T8640]  virtqueue_napi_complete+0x28/0x80
[   31.525229][ T8640]  virtnet_poll+0x64f/0x780
[   31.529708][ T8640]  napi_poll+0x178/0x4a0
[   31.533928][ T8640]  net_rx_action+0x1ba/0x530
[   31.538506][ T8640]  __do_softirq+0x198/0x360
[   31.542980][ T8640]  asm_call_on_stack+0xf/0x20
[   31.547631][ T8640]  do_softirq_own_stack+0x5d/0x80
[   31.552639][ T8640]  __irq_exit_rcu+0x115/0x120
[   31.557305][ T8640]  common_interrupt+0x14e/0x1e0
[   31.562128][ T8640]  asm_common_interrupt+0x1e/0x40
[   31.567132][ T8640] 
[   31.569436][ T8640] read to 0xffff888124ebea10 of 8 bytes by task 8640 on cpu 0:
[   31.577072][ T8640]  do_epoll_wait+0x2e2/0x870
[   31.581635][ T8640]  __x64_sys_epoll_pwait+0x92/0x150
[   31.586808][ T8640]  do_syscall_64+0x51/0xb0
[   31.591217][ T8640]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   31.597073][ T8640] 
[   31.599373][ T8640] Reported by Kernel Concurrency Sanitizer on:
[   31.605511][ T8640] CPU: 0 PID: 8640 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0
[   31.613728][ T8640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.623758][ T8640] ==================================================================
[   31.631793][ T8640] Kernel panic - not syncing: panic_on_warn set ...
[   31.638364][ T8640] CPU: 0 PID: 8640 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0
[   31.646570][ T8640] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   31.656597][ T8640] Call Trace:
[   31.659876][ T8640]  dump_stack+0x10f/0x19d
[   31.664177][ T8640]  panic+0x207/0x64a
[   31.668048][ T8640]  ? vprintk_emit+0x44a/0x4f0
[   31.672712][ T8640]  kcsan_report+0x684/0x690
[   31.677189][ T8640]  ? kcsan_setup_watchpoint+0x453/0x4d0
[   31.682710][ T8640]  ? do_epoll_wait+0x2e2/0x870
[   31.687449][ T8640]  ? __x64_sys_epoll_pwait+0x92/0x150
[   31.692808][ T8640]  ? do_syscall_64+0x51/0xb0
[   31.697375][ T8640]  ? entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   31.703430][ T8640]  ? ep_send_events_proc+0x4fd/0x620
[   31.708692][ T8640]  kcsan_setup_watchpoint+0x453/0x4d0
[   31.714038][ T8640]  do_epoll_wait+0x2e2/0x870
[   31.718615][ T8640]  ? debug_smp_processor_id+0x18/0x20
[   31.723962][ T8640]  __x64_sys_epoll_pwait+0x92/0x150
[   31.729132][ T8640]  do_syscall_64+0x51/0xb0
[   31.733527][ T8640]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   31.739389][ T8640] RIP: 0033:0x469240
[   31.743249][ T8640] Code: Bad RIP value.
[   31.747287][ T8640] RSP: 002b:00007ffd8873de60 EFLAGS: 00000246 ORIG_RAX: 0000000000000119
[   31.755668][ T8640] RAX: ffffffffffffffda RBX: 00000000000003dd RCX: 0000000000469240
[   31.763615][ T8640] RDX: 0000000000000080 RSI: 00007ffd8873deb0 RDI: 0000000000000003
[   31.771559][ T8640] RBP: 00007ffd8873e4b0 R08: 0000000000000000 R09: 0000000000000000
[   31.779515][ T8640] R10: 00000000000003dd R11: 0000000000000246 R12: 0000000000000003
[   31.787461][ T8640] R13: 00000000017a9e20 R14: 0000004d2800d4f8 R15: 0000000000000002
[   31.796645][ T8640] Kernel Offset: disabled
[   31.800958][ T8640] Rebooting in 86400 seconds..