Warning: Permanently added '10.128.1.16' (ECDSA) to the list of known hosts. 2019/10/13 20:58:57 fuzzer started 2019/10/13 20:58:58 dialing manager at 10.128.0.105:40973 2019/10/13 20:58:58 syscalls: 2523 2019/10/13 20:58:58 code coverage: enabled 2019/10/13 20:58:58 comparison tracing: enabled 2019/10/13 20:58:58 extra coverage: extra coverage is not supported by the kernel syzkaller login: [ 45.350969][ T7281] ================================================================== [ 45.359197][ T7281] BUG: KCSAN: data-race in tcp_ack / tcp_poll [ 45.365259][ T7281] [ 45.367588][ T7281] write to 0xffff888123a25348 of 4 bytes by interrupt on cpu 1: [ 45.375213][ T7281] tcp_ack+0xf2c/0x3160 [ 45.379355][ T7281] tcp_rcv_established+0x37e/0xf50 [ 45.384586][ T7281] tcp_v4_do_rcv+0x381/0x4e0 [ 45.389165][ T7281] tcp_v4_rcv+0x1a03/0x1bf0 [ 45.393760][ T7281] ip_protocol_deliver_rcu+0x51/0x470 [ 45.399138][ T7281] ip_local_deliver_finish+0x110/0x140 [ 45.405734][ T7281] ip_local_deliver+0x133/0x210 [ 45.410595][ T7281] ip_rcv_finish+0x121/0x160 [ 45.415184][ T7281] ip_rcv+0x18f/0x1a0 [ 45.419166][ T7281] __netif_receive_skb_one_core+0xa7/0xe0 [ 45.425064][ T7281] __netif_receive_skb+0x37/0xf0 [ 45.429989][ T7281] netif_receive_skb_internal+0x59/0x190 [ 45.435626][ T7281] napi_gro_receive+0x28f/0x330 [ 45.440468][ T7281] receive_buf+0x284/0x30b0 [ 45.444947][ T7281] [ 45.447265][ T7281] read to 0xffff888123a25348 of 4 bytes by task 7281 on cpu 0: [ 45.456800][ T7281] tcp_poll+0x422/0x6b0 [ 45.460984][ T7281] sock_poll+0xed/0x250 [ 45.465153][ T7281] do_select+0x7d0/0x1020 [ 45.469508][ T7281] core_sys_select+0x38b/0x520 [ 45.474277][ T7281] kern_select+0x106/0x170 [ 45.478775][ T7281] __x64_sys_select+0x70/0x90 [ 45.483461][ T7281] do_syscall_64+0xcf/0x2f0 [ 45.487980][ T7281] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.493944][ T7281] [ 45.496254][ T7281] Reported by Kernel Concurrency Sanitizer on: [ 45.502403][ T7281] CPU: 0 PID: 7281 Comm: sshd Not tainted 5.3.0+ #0 [ 45.508989][ T7281] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.519028][ T7281] ================================================================== [ 45.527073][ T7281] Kernel panic - not syncing: panic_on_warn set ... [ 45.533660][ T7281] CPU: 0 PID: 7281 Comm: sshd Not tainted 5.3.0+ #0 [ 45.540247][ T7281] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.550285][ T7281] Call Trace: [ 45.553587][ T7281] dump_stack+0xf5/0x159 [ 45.558112][ T7281] panic+0x209/0x639 [ 45.562030][ T7281] ? vprintk_func+0x8d/0x140 [ 45.566710][ T7281] kcsan_report.cold+0xc/0x1b [ 45.571393][ T7281] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.576958][ T7281] __tsan_read4+0x2c/0x30 [ 45.581287][ T7281] tcp_poll+0x422/0x6b0 [ 45.585429][ T7281] ? tcp_alloc_md5sig_pool+0x320/0x320 [ 45.590874][ T7281] sock_poll+0xed/0x250 [ 45.595132][ T7281] ? sock_read_iter+0x1e0/0x1e0 [ 45.600877][ T7281] do_select+0x7d0/0x1020 [ 45.605220][ T7281] ? poll_initwait+0xa0/0xa0 [ 45.609935][ T7281] ? set_fd_set.part.0+0x60/0x60 [ 45.614971][ T7281] ? set_fd_set.part.0+0x60/0x60 [ 45.620050][ T7281] ? set_fd_set.part.0+0x60/0x60 [ 45.624997][ T7281] ? set_fd_set.part.0+0x60/0x60 [ 45.629928][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.635546][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.641165][ T7281] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 45.647047][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.652672][ T7281] ? __tsan_read4+0x2c/0x30 [ 45.657173][ T7281] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 45.662909][ T7281] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.669137][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.674784][ T7281] ? timespec64_trunc+0x88/0xc0 [ 45.679623][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.685239][ T7281] ? __tsan_read8+0x2c/0x30 [ 45.689736][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.695359][ T7281] ? check_stack_object+0xda/0x110 [ 45.700469][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.706093][ T7281] ? __tsan_read8+0x2c/0x30 [ 45.710857][ T7281] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.717107][ T7281] core_sys_select+0x38b/0x520 [ 45.721857][ T7281] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.727561][ T7281] ? __tsan_read8+0x2c/0x30 [ 45.732069][ T7281] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 45.737953][ T7281] ? __tsan_write8+0x32/0x40 [ 45.742528][ T7281] ? ktime_get_ts64+0x286/0x2b0 [ 45.747380][ T7281] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 45.753084][ T7281] ? timespec64_add_safe+0xae/0xd0 [ 45.758190][ T7281] kern_select+0x106/0x170 [ 45.762682][ T7281] __x64_sys_select+0x70/0x90 [ 45.767434][ T7281] do_syscall_64+0xcf/0x2f0 [ 45.771973][ T7281] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.777958][ T7281] RIP: 0033:0x7f85353d2dd3 [ 45.782382][ T7281] Code: 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 90 90 90 83 3d 25 48 2b 00 00 75 13 49 89 ca b8 17 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 ab 2f 01 00 48 89 04 24 [ 45.801978][ T7281] RSP: 002b:00007fff0bc8ee78 EFLAGS: 00000246 ORIG_RAX: 0000000000000017 [ 45.810390][ T7281] RAX: ffffffffffffffda RBX: 00007fff0bc8ef00 RCX: 00007f85353d2dd3 [ 45.818373][ T7281] RDX: 000055be37125af0 RSI: 000055be37125b10 RDI: 000000000000000c [ 45.826647][ T7281] RBP: 000055be356ff8dc R08: 00007fff0bc8eea0 R09: 0101010101010101 [ 45.834617][ T7281] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff0bc8ef08 [ 45.842968][ T7281] R13: 0000000000000000 R14: 00007fff0bc8eef8 R15: 00007fff0bc8eefc [ 45.852420][ T7281] Kernel Offset: disabled [ 45.856930][ T7281] Rebooting in 86400 seconds..