[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.600200][ T26] audit: type=1800 audit(1571736818.607:25): pid=7053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.638289][ T26] audit: type=1800 audit(1571736818.617:26): pid=7053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 39.680641][ T26] audit: type=1800 audit(1571736818.617:27): pid=7053 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.208' (ECDSA) to the list of known hosts. 2019/10/22 09:33:47 fuzzer started 2019/10/22 09:33:49 dialing manager at 10.128.0.105:37053 2019/10/22 09:33:49 syscalls: 2524 2019/10/22 09:33:49 code coverage: enabled 2019/10/22 09:33:49 comparison tracing: enabled 2019/10/22 09:33:49 extra coverage: extra coverage is not supported by the kernel 2019/10/22 09:33:49 setuid sandbox: enabled 2019/10/22 09:33:49 namespace sandbox: enabled 2019/10/22 09:33:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 09:33:49 fault injection: enabled 2019/10/22 09:33:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 09:33:49 net packet injection: enabled 2019/10/22 09:33:49 net device setup: enabled 2019/10/22 09:33:49 concurrency sanitizer: enabled syzkaller login: [ 50.701331][ T7214] ================================================================== [ 50.709545][ T7214] BUG: KCSAN: data-race in __nf_conntrack_find_get / __nf_ct_refresh_acct [ 50.718190][ T7214] [ 50.720523][ T7214] read to 0xffff888122d27a08 of 4 bytes by interrupt on cpu 1: [ 50.728182][ T7214] __nf_conntrack_find_get+0x284/0x880 [ 50.733656][ T7214] nf_conntrack_in+0x2ef/0xa80 [ 50.738783][ T7214] ipv4_conntrack_in+0x27/0x40 [ 50.743536][ T7214] nf_hook_slow+0x83/0x160 [ 50.747932][ T7214] ip_rcv+0x12f/0x1a0 [ 50.751925][ T7214] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.757665][ T7214] __netif_receive_skb+0x37/0xf0 [ 50.762605][ T7214] netif_receive_skb_internal+0x59/0x190 [ 50.768246][ T7214] napi_gro_receive+0x28f/0x330 [ 50.773087][ T7214] receive_buf+0x284/0x30b0 [ 50.777617][ T7214] virtnet_poll+0x436/0x7d0 [ 50.782250][ T7214] net_rx_action+0x3ae/0xa90 [ 50.786967][ T7214] __do_softirq+0x115/0x33f [ 50.791460][ T7214] irq_exit+0xbb/0xe0 [ 50.795424][ T7214] [ 50.797737][ T7214] write to 0xffff888122d27a08 of 4 bytes by task 7214 on cpu 0: [ 50.805359][ T7214] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.810517][ T7214] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.816054][ T7214] nf_conntrack_in+0x410/0xa80 [ 50.820809][ T7214] ipv4_conntrack_local+0xbe/0x130 [ 50.826399][ T7214] nf_hook_slow+0x83/0x160 [ 50.830913][ T7214] __ip_local_out+0x1f7/0x2b0 [ 50.835723][ T7214] ip_local_out+0x31/0x90 [ 50.840236][ T7214] __ip_queue_xmit+0x3a8/0xa40 [ 50.845007][ T7214] ip_queue_xmit+0x45/0x60 [ 50.849440][ T7214] __tcp_transmit_skb+0xe81/0x1d60 [ 50.854631][ T7214] __tcp_send_ack+0x246/0x300 [ 50.859417][ T7214] tcp_send_ack+0x34/0x40 [ 50.863842][ T7214] tcp_cleanup_rbuf+0x130/0x360 [ 50.868791][ T7214] [ 50.871306][ T7214] Reported by Kernel Concurrency Sanitizer on: [ 50.877500][ T7214] CPU: 0 PID: 7214 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.885020][ T7214] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.895087][ T7214] ================================================================== [ 50.903638][ T7214] Kernel panic - not syncing: panic_on_warn set ... [ 50.910379][ T7214] CPU: 0 PID: 7214 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.917848][ T7214] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.927912][ T7214] Call Trace: [ 50.931224][ T7214] dump_stack+0xf5/0x159 [ 50.935506][ T7214] panic+0x210/0x640 [ 50.939417][ T7214] ? ip_queue_xmit+0x45/0x60 [ 50.944010][ T7214] ? vprintk_func+0x8d/0x140 [ 50.948706][ T7214] kcsan_report.cold+0xc/0x10 [ 50.953395][ T7214] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.959057][ T7214] __tsan_write4+0x32/0x40 [ 50.963495][ T7214] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.968615][ T7214] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.974184][ T7214] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.979835][ T7214] nf_conntrack_in+0x410/0xa80 [ 50.984702][ T7214] ipv4_conntrack_local+0xbe/0x130 [ 50.989952][ T7214] nf_hook_slow+0x83/0x160 [ 50.994407][ T7214] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 50.999614][ T7214] __ip_local_out+0x1f7/0x2b0 [ 51.004372][ T7214] ? constant_test_bit+0x30/0x30 [ 51.009970][ T7214] ip_local_out+0x31/0x90 [ 51.014520][ T7214] __ip_queue_xmit+0x3a8/0xa40 [ 51.019483][ T7214] ip_queue_xmit+0x45/0x60 [ 51.023940][ T7214] __tcp_transmit_skb+0xe81/0x1d60 [ 51.029427][ T7214] __tcp_send_ack+0x246/0x300 [ 51.034098][ T7214] tcp_send_ack+0x34/0x40 [ 51.038777][ T7214] tcp_cleanup_rbuf+0x130/0x360 [ 51.043648][ T7214] tcp_recvmsg+0x633/0x1a30 [ 51.048187][ T7214] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 51.054105][ T7214] inet_recvmsg+0xbb/0x250 [ 51.058794][ T7214] ? __tsan_read8+0x2c/0x30 [ 51.063367][ T7214] ? inet_sendpage+0x100/0x100 [ 51.068146][ T7214] sock_recvmsg+0x92/0xb0 [ 51.072467][ T7214] sock_read_iter+0x15f/0x1e0 [ 51.080262][ T7214] new_sync_read+0x389/0x4f0 [ 51.084843][ T7214] __vfs_read+0xb1/0xc0 [ 51.088984][ T7214] vfs_read+0x143/0x2c0 [ 51.093137][ T7214] ksys_read+0xd5/0x1b0 [ 51.097276][ T7214] __x64_sys_read+0x4c/0x60 [ 51.101774][ T7214] do_syscall_64+0xcc/0x370 [ 51.106262][ T7214] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.112137][ T7214] RIP: 0033:0x47c530 [ 51.116030][ T7214] 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 [ 51.135626][ T7214] RSP: 002b:000000c4203cb7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 51.144031][ T7214] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 51.152034][ T7214] RDX: 0000000000001000 RSI: 000000c420152000 RDI: 0000000000000003 [ 51.160124][ T7214] RBP: 000000c4203cb830 R08: 0000000000000000 R09: 0000000000000000 [ 51.168127][ T7214] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 51.176103][ T7214] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 51.185464][ T7214] Kernel Offset: disabled [ 51.189797][ T7214] Rebooting in 86400 seconds..