[ 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 '10.128.10.40' (ECDSA) to the list of known hosts. 2020/06/07 20:54:43 fuzzer started 2020/06/07 20:54:44 dialing manager at 10.128.0.105:40519 2020/06/07 20:54:45 syscalls: 3055 2020/06/07 20:54:45 code coverage: enabled 2020/06/07 20:54:45 comparison tracing: enabled 2020/06/07 20:54:45 extra coverage: enabled 2020/06/07 20:54:45 setuid sandbox: enabled 2020/06/07 20:54:45 namespace sandbox: enabled 2020/06/07 20:54:45 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/07 20:54:45 fault injection: enabled 2020/06/07 20:54:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/07 20:54:45 net packet injection: enabled 2020/06/07 20:54:45 net device setup: enabled 2020/06/07 20:54:45 concurrency sanitizer: enabled 2020/06/07 20:54:45 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/07 20:54:45 USB emulation: enabled 2020/06/07 20:54:45 adding functions to KCSAN blacklist: 'ext4_free_inodes_count' 'find_get_pages_range_tag' syzkaller login: [ 51.960126][ T8907] ================================================================== [ 51.968391][ T8907] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 51.975315][ T8907] [ 51.977653][ T8907] write to 0xffff888121241050 of 8 bytes by interrupt on cpu 1: [ 51.985614][ T8907] ep_poll_callback+0x5f2/0x6c0 [ 51.990443][ T8907] __wake_up_common+0x76/0x180 [ 51.995270][ T8907] __wake_up_common_lock+0x77/0xb0 [ 52.000371][ T8907] sock_def_readable+0x9d/0x130 [ 52.005209][ T8907] tcp_data_ready+0x76/0xc0 [ 52.009696][ T8907] tcp_rcv_established+0xcb8/0xee0 [ 52.014787][ T8907] tcp_v4_do_rcv+0x396/0x4f0 [ 52.019368][ T8907] tcp_v4_rcv+0x1c55/0x1e10 [ 52.023855][ T8907] ip_protocol_deliver_rcu+0x4b/0x410 [ 52.029207][ T8907] ip_local_deliver_finish+0xf3/0x120 [ 52.034663][ T8907] ip_local_deliver+0x135/0x220 [ 52.039497][ T8907] ip_sublist_rcv_finish+0xf0/0x140 [ 52.044777][ T8907] ip_sublist_rcv+0x3f8/0x530 [ 52.049446][ T8907] ip_list_rcv+0x2f3/0x321 [ 52.054945][ T8907] __netif_receive_skb_list_core+0x368/0x5c0 [ 52.060911][ T8907] netif_receive_skb_list_internal+0x5c7/0x810 [ 52.067046][ T8907] gro_normal_list.part.0+0x37/0xa0 [ 52.072592][ T8907] gro_normal_one+0x14c/0x160 [ 52.077247][ T8907] napi_gro_receive+0x27d/0x2f0 [ 52.082092][ T8907] receive_buf+0x24c/0x3420 [ 52.086587][ T8907] virtnet_poll+0x343/0x790 [ 52.091091][ T8907] net_rx_action+0x3ad/0xac0 [ 52.095657][ T8907] __do_softirq+0x118/0x34a [ 52.100136][ T8907] run_ksoftirqd+0x41/0x60 [ 52.104533][ T8907] smpboot_thread_fn+0x374/0x4a0 [ 52.109446][ T8907] kthread+0x203/0x230 [ 52.113754][ T8907] ret_from_fork+0x1f/0x30 [ 52.118139][ T8907] [ 52.120459][ T8907] read to 0xffff888121241050 of 8 bytes by task 8907 on cpu 0: [ 52.127998][ T8907] ep_poll+0x5ad/0x910 [ 52.132043][ T8907] do_epoll_wait+0x15a/0x180 [ 52.136628][ T8907] __x64_sys_epoll_pwait+0xc6/0x170 [ 52.141803][ T8907] do_syscall_64+0xc7/0x3b0 [ 52.146555][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.152429][ T8907] [ 52.154729][ T8907] Reported by Kernel Concurrency Sanitizer on: [ 52.160965][ T8907] CPU: 0 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.169189][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.179235][ T8907] ================================================================== [ 52.187270][ T8907] Kernel panic - not syncing: panic_on_warn set ... [ 52.193833][ T8907] CPU: 0 PID: 8907 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.202168][ T8907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.212203][ T8907] Call Trace: [ 52.215480][ T8907] dump_stack+0x11d/0x187 [ 52.219806][ T8907] panic+0x210/0x640 [ 52.223685][ T8907] ? vprintk_func+0x89/0x13a [ 52.228266][ T8907] kcsan_report.cold+0xc/0x1a [ 52.232922][ T8907] kcsan_setup_watchpoint+0x3fb/0x440 [ 52.238290][ T8907] ep_poll+0x5ad/0x910 [ 52.242352][ T8907] ? wake_up_q+0x90/0x90 [ 52.246585][ T8907] do_epoll_wait+0x15a/0x180 [ 52.251162][ T8907] __x64_sys_epoll_pwait+0xc6/0x170 [ 52.256342][ T8907] do_syscall_64+0xc7/0x3b0 [ 52.260827][ T8907] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.266708][ T8907] RIP: 0033:0x469240 [ 52.270600][ T8907] 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 [ 52.290181][ T8907] RSP: 002b:000000c00004f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 52.298656][ T8907] RAX: ffffffffffffffda RBX: 00000000000002a9 RCX: 0000000000469240 [ 52.306618][ T8907] RDX: 0000000000000080 RSI: 000000c00004f840 RDI: 0000000000000003 [ 52.314565][ T8907] RBP: 000000c00004fe40 R08: 0000000000000000 R09: 0000000000000000 [ 52.322515][ T8907] R10: 00000000000002a9 R11: 0000000000000246 R12: 0000000000000003 [ 52.330484][ T8907] R13: 000000c000000900 R14: 0000000000000004 R15: 0000000000000004 [ 52.339790][ T8907] Kernel Offset: disabled [ 52.344138][ T8907] Rebooting in 86400 seconds..