[ 51.412880][ T25] audit: type=1800 audit(1575076557.870:21): pid=7457 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [....] Starting enhanced syslogd: rsyslogd[ 51.828563][ T7482] rsyslogd (7482) used greatest stack depth: 10512 bytes left [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 52.382937][ T7523] sshd (7523) used greatest stack depth: 10128 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.209' (ECDSA) to the list of known hosts. 2019/11/30 01:16:10 fuzzer started 2019/11/30 01:16:11 dialing manager at 10.128.0.105:44645 2019/11/30 01:16:11 syscalls: 2592 2019/11/30 01:16:11 code coverage: enabled 2019/11/30 01:16:11 comparison tracing: enabled 2019/11/30 01:16:11 extra coverage: extra coverage is not supported by the kernel 2019/11/30 01:16:11 setuid sandbox: enabled 2019/11/30 01:16:11 namespace sandbox: enabled 2019/11/30 01:16:11 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/30 01:16:11 fault injection: enabled 2019/11/30 01:16:11 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/30 01:16:11 net packet injection: enabled 2019/11/30 01:16:11 net device setup: enabled 2019/11/30 01:16:11 concurrency sanitizer: enabled 2019/11/30 01:16:11 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/30 01:16:12 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'find_get_pages_range_tag' 'tomoyo_supervisor' syzkaller login: [ 66.065964][ T7609] ================================================================== [ 66.074135][ T7609] BUG: KCSAN: data-race in tcp_add_backlog / tcp_recvmsg [ 66.081143][ T7609] [ 66.083462][ T7609] write to 0xffff8881267bc9f8 of 8 bytes by interrupt on cpu 1: [ 66.091077][ T7609] tcp_add_backlog+0x476/0xce0 [ 66.095824][ T7609] tcp_v4_rcv+0x1a70/0x1bd0 [ 66.100308][ T7609] ip_protocol_deliver_rcu+0x4d/0x420 [ 66.105705][ T7609] ip_local_deliver_finish+0x110/0x140 [ 66.111146][ T7609] ip_local_deliver+0x133/0x210 [ 66.115979][ T7609] ip_rcv_finish+0x121/0x160 [ 66.120550][ T7609] ip_rcv+0x18f/0x1a0 [ 66.124529][ T7609] __netif_receive_skb_one_core+0xa7/0xe0 [ 66.130227][ T7609] __netif_receive_skb+0x37/0xf0 [ 66.135143][ T7609] netif_receive_skb_internal+0x59/0x190 [ 66.140752][ T7609] napi_gro_receive+0x28f/0x330 [ 66.145584][ T7609] receive_buf+0x284/0x30b0 [ 66.150063][ T7609] virtnet_poll+0x436/0x7d0 [ 66.154565][ T7609] net_rx_action+0x3ae/0xa90 [ 66.159147][ T7609] __do_softirq+0x115/0x33f [ 66.163632][ T7609] run_ksoftirqd+0x46/0x60 [ 66.168028][ T7609] smpboot_thread_fn+0x37d/0x4a0 [ 66.172944][ T7609] kthread+0x1d4/0x200 [ 66.176999][ T7609] ret_from_fork+0x1f/0x30 [ 66.181389][ T7609] [ 66.183714][ T7609] read to 0xffff8881267bc9f8 of 8 bytes by task 7609 on cpu 0: [ 66.191334][ T7609] tcp_recvmsg+0x46e/0x1b40 [ 66.195832][ T7609] inet_recvmsg+0xbb/0x250 [ 66.200230][ T7609] sock_recvmsg+0x92/0xb0 [ 66.204539][ T7609] sock_read_iter+0x15f/0x1e0 [ 66.209193][ T7609] new_sync_read+0x389/0x4f0 [ 66.213769][ T7609] __vfs_read+0xb1/0xc0 [ 66.217905][ T7609] vfs_read+0x143/0x2c0 [ 66.222052][ T7609] ksys_read+0xd5/0x1b0 [ 66.226186][ T7609] __x64_sys_read+0x4c/0x60 [ 66.230684][ T7609] do_syscall_64+0xcc/0x370 [ 66.235167][ T7609] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.241029][ T7609] [ 66.243335][ T7609] Reported by Kernel Concurrency Sanitizer on: [ 66.249483][ T7609] CPU: 0 PID: 7609 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 66.257346][ T7609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.267378][ T7609] ================================================================== [ 66.275418][ T7609] Kernel panic - not syncing: panic_on_warn set ... [ 66.281986][ T7609] CPU: 0 PID: 7609 Comm: syz-fuzzer Not tainted 5.4.0-syzkaller #0 [ 66.289878][ T7609] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.299912][ T7609] Call Trace: [ 66.303203][ T7609] dump_stack+0x11d/0x181 [ 66.307520][ T7609] panic+0x210/0x640 [ 66.311399][ T7609] ? vprintk_func+0x8d/0x140 [ 66.315977][ T7609] kcsan_report.cold+0xc/0xd [ 66.320553][ T7609] kcsan_setup_watchpoint+0x3fe/0x460 [ 66.325908][ T7609] __tsan_read8+0xc6/0x100 [ 66.330317][ T7609] tcp_recvmsg+0x46e/0x1b40 [ 66.334833][ T7609] ? debug_smp_processor_id+0x4c/0x172 [ 66.340288][ T7609] inet_recvmsg+0xbb/0x250 [ 66.344690][ T7609] ? apparmor_socket_recvmsg+0x3b/0x50 [ 66.350135][ T7609] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 66.356378][ T7609] ? security_socket_recvmsg+0x92/0xb0 [ 66.361851][ T7609] ? inet_sendpage+0x100/0x100 [ 66.366597][ T7609] sock_recvmsg+0x92/0xb0 [ 66.370911][ T7609] sock_read_iter+0x15f/0x1e0 [ 66.375587][ T7609] new_sync_read+0x389/0x4f0 [ 66.380162][ T7609] __vfs_read+0xb1/0xc0 [ 66.384297][ T7609] vfs_read+0x143/0x2c0 [ 66.388436][ T7609] ksys_read+0xd5/0x1b0 [ 66.392679][ T7609] __x64_sys_read+0x4c/0x60 [ 66.397166][ T7609] do_syscall_64+0xcc/0x370 [ 66.401660][ T7609] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 66.407558][ T7609] RIP: 0033:0x47c530 [ 66.411441][ T7609] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 66.431032][ T7609] RSP: 002b:000000c4202df810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 66.439426][ T7609] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 66.447380][ T7609] RDX: 0000000000001000 RSI: 000000c420304000 RDI: 0000000000000003 [ 66.455333][ T7609] RBP: 000000c4202df868 R08: 0000000000000000 R09: 0000000000000000 [ 66.463299][ T7609] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 66.471250][ T7609] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 66.480604][ T7609] Kernel Offset: disabled [ 66.484948][ T7609] Rebooting in 86400 seconds..