[ 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2020/06/11 16:14:29 fuzzer started 2020/06/11 16:14:29 dialing manager at 10.128.0.105:39743 2020/06/11 16:14:29 syscalls: 3078 2020/06/11 16:14:29 code coverage: enabled 2020/06/11 16:14:29 comparison tracing: enabled 2020/06/11 16:14:29 extra coverage: enabled 2020/06/11 16:14:29 setuid sandbox: enabled 2020/06/11 16:14:29 namespace sandbox: enabled 2020/06/11 16:14:29 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/11 16:14:29 fault injection: enabled 2020/06/11 16:14:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/11 16:14:29 net packet injection: enabled 2020/06/11 16:14:29 net device setup: enabled 2020/06/11 16:14:29 concurrency sanitizer: enabled 2020/06/11 16:14:29 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/11 16:14:29 USB emulation: enabled 2020/06/11 16:14:29 adding functions to KCSAN blacklist: '__ext4_new_inode' 'run_timer_softirq' 'copy_process' syzkaller login: [ 53.248380][ T8919] ================================================================== [ 53.256509][ T8919] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 53.263250][ T8919] [ 53.265586][ T8919] write to 0xffff8881266fe4d0 of 8 bytes by interrupt on cpu 0: [ 53.273203][ T8919] ep_poll_callback+0x5f2/0x6c0 [ 53.278039][ T8919] __wake_up_common+0x76/0x180 [ 53.282804][ T8919] __wake_up_common_lock+0x77/0xb0 [ 53.287902][ T8919] sock_def_readable+0x9d/0x130 [ 53.292740][ T8919] tcp_data_ready+0x76/0xc0 [ 53.297235][ T8919] tcp_data_queue+0xd09/0x20a0 [ 53.301984][ T8919] tcp_rcv_established+0x4fc/0xee0 [ 53.307091][ T8919] tcp_v4_do_rcv+0x396/0x4f0 [ 53.312011][ T8919] tcp_v4_rcv+0x1c55/0x1e10 [ 53.316758][ T8919] ip_protocol_deliver_rcu+0x4b/0x410 [ 53.322116][ T8919] ip_local_deliver_finish+0xf3/0x120 [ 53.327473][ T8919] ip_local_deliver+0x135/0x220 [ 53.332309][ T8919] ip_sublist_rcv_finish+0xf0/0x140 [ 53.337499][ T8919] ip_sublist_rcv+0x3f8/0x530 [ 53.342162][ T8919] ip_list_rcv+0x2f3/0x321 [ 53.346567][ T8919] __netif_receive_skb_list_core+0x368/0x5c0 [ 53.352548][ T8919] netif_receive_skb_list_internal+0x5c7/0x810 [ 53.358687][ T8919] gro_normal_list.part.0+0x37/0xa0 [ 53.363877][ T8919] gro_normal_one+0x14c/0x160 [ 53.368547][ T8919] napi_gro_receive+0x27d/0x2f0 [ 53.373392][ T8919] receive_buf+0x24c/0x3420 [ 53.377879][ T8919] virtnet_poll+0x343/0x790 [ 53.382381][ T8919] net_rx_action+0x3ad/0xac0 [ 53.386958][ T8919] __do_softirq+0x118/0x34a [ 53.391445][ T8919] run_ksoftirqd+0x41/0x60 [ 53.395848][ T8919] smpboot_thread_fn+0x374/0x4a0 [ 53.400768][ T8919] kthread+0x203/0x230 [ 53.404820][ T8919] ret_from_fork+0x1f/0x30 [ 53.409208][ T8919] [ 53.411526][ T8919] read to 0xffff8881266fe4d0 of 8 bytes by task 8919 on cpu 1: [ 53.419084][ T8919] ep_poll+0x8f/0x910 [ 53.423048][ T8919] do_epoll_wait+0x15a/0x180 [ 53.427623][ T8919] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.432806][ T8919] do_syscall_64+0xc7/0x3b0 [ 53.437294][ T8919] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.443159][ T8919] [ 53.445475][ T8919] Reported by Kernel Concurrency Sanitizer on: [ 53.451613][ T8919] CPU: 1 PID: 8919 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.459917][ T8919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.469954][ T8919] ================================================================== [ 53.477999][ T8919] Kernel panic - not syncing: panic_on_warn set ... [ 53.484574][ T8919] CPU: 1 PID: 8919 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.492792][ T8919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.502856][ T8919] Call Trace: [ 53.506138][ T8919] dump_stack+0x11d/0x187 [ 53.510479][ T8919] panic+0x210/0x640 [ 53.514366][ T8919] ? vprintk_func+0x89/0x13a [ 53.518944][ T8919] kcsan_report.cold+0xc/0x1a [ 53.523618][ T8919] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.528980][ T8919] ep_poll+0x8f/0x910 [ 53.532969][ T8919] ? __fget_files+0xa2/0x1c0 [ 53.537553][ T8919] ? __fget_light+0xc0/0x1a0 [ 53.542136][ T8919] do_epoll_wait+0x15a/0x180 [ 53.546719][ T8919] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.551918][ T8919] do_syscall_64+0xc7/0x3b0 [ 53.556412][ T8919] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.562297][ T8919] RIP: 0033:0x469240 [ 53.566189][ T8919] 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 [ 53.585783][ T8919] RSP: 002b:000000c0003957f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 53.594184][ T8919] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000469240 [ 53.602141][ T8919] RDX: 0000000000000080 RSI: 000000c000395840 RDI: 0000000000000003 [ 53.610103][ T8919] RBP: 000000c000395e40 R08: 0000000000000000 R09: 0000000000000000 [ 53.618147][ T8919] R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000003 [ 53.626108][ T8919] R13: 000000c0000ab080 R14: 000000523e082376 R15: 000000000000000d [ 53.635436][ T8919] Kernel Offset: disabled [ 53.639784][ T8919] Rebooting in 86400 seconds..