[ 36.585719][ T25] audit: type=1800 audit(1571767370.196:25): pid=7030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.630721][ T25] audit: type=1800 audit(1571767370.196:26): pid=7030 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.654152][ T25] audit: type=1800 audit(1571767370.196:27): pid=7030 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. [ 37.103885][ T7099] sshd (7099) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. 2019/10/22 18:03:02 fuzzer started 2019/10/22 18:03:03 dialing manager at 10.128.0.105:33369 2019/10/22 18:03:03 syscalls: 2524 2019/10/22 18:03:03 code coverage: enabled 2019/10/22 18:03:03 comparison tracing: enabled 2019/10/22 18:03:03 extra coverage: extra coverage is not supported by the kernel 2019/10/22 18:03:03 setuid sandbox: enabled 2019/10/22 18:03:03 namespace sandbox: enabled 2019/10/22 18:03:03 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 18:03:03 fault injection: enabled 2019/10/22 18:03:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 18:03:03 net packet injection: enabled 2019/10/22 18:03:03 net device setup: enabled 2019/10/22 18:03:03 concurrency sanitizer: enabled syzkaller login: [ 50.429240][ T7197] ================================================================== [ 50.437395][ T7197] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 50.445615][ T7197] [ 50.448211][ T7197] read to 0xffff888126420508 of 4 bytes by interrupt on cpu 1: [ 50.455900][ T7197] __nf_ct_refresh_acct+0xd4/0x1b0 [ 50.461009][ T7197] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.466541][ T7197] nf_conntrack_in+0x410/0xa80 [ 50.471285][ T7197] ipv4_conntrack_in+0x27/0x40 [ 50.476111][ T7197] nf_hook_slow+0x83/0x160 [ 50.480534][ T7197] ip_rcv+0x12f/0x1a0 [ 50.484616][ T7197] __netif_receive_skb_one_core+0xa7/0xe0 [ 50.490344][ T7197] __netif_receive_skb+0x37/0xf0 [ 50.495636][ T7197] netif_receive_skb_internal+0x59/0x190 [ 50.501252][ T7197] napi_gro_receive+0x28f/0x330 [ 50.506433][ T7197] receive_buf+0x284/0x30b0 [ 50.510916][ T7197] virtnet_poll+0x436/0x7d0 [ 50.515541][ T7197] net_rx_action+0x3ae/0xa90 [ 50.520139][ T7197] __do_softirq+0x115/0x33f [ 50.524619][ T7197] [ 50.526943][ T7197] write to 0xffff888126420508 of 4 bytes by task 7197 on cpu 0: [ 50.534640][ T7197] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.539732][ T7197] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.545260][ T7197] nf_conntrack_in+0x410/0xa80 [ 50.550042][ T7197] ipv4_conntrack_local+0xbe/0x130 [ 50.555142][ T7197] nf_hook_slow+0x83/0x160 [ 50.561750][ T7197] __ip_local_out+0x1f7/0x2b0 [ 50.566424][ T7197] ip_local_out+0x31/0x90 [ 50.570732][ T7197] __ip_queue_xmit+0x3a8/0xa40 [ 50.575496][ T7197] ip_queue_xmit+0x45/0x60 [ 50.579902][ T7197] __tcp_transmit_skb+0xe81/0x1d60 [ 50.584993][ T7197] __tcp_send_ack+0x246/0x300 [ 50.589645][ T7197] tcp_send_ack+0x34/0x40 [ 50.593981][ T7197] tcp_cleanup_rbuf+0x130/0x360 [ 50.598874][ T7197] [ 50.601200][ T7197] Reported by Kernel Concurrency Sanitizer on: [ 50.607334][ T7197] CPU: 0 PID: 7197 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.614833][ T7197] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.624877][ T7197] ================================================================== [ 50.632924][ T7197] Kernel panic - not syncing: panic_on_warn set ... [ 50.639506][ T7197] CPU: 0 PID: 7197 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.646938][ T7197] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.656972][ T7197] Call Trace: [ 50.660248][ T7197] dump_stack+0xf5/0x159 [ 50.664485][ T7197] panic+0x210/0x640 [ 50.668363][ T7197] ? ip_queue_xmit+0x45/0x60 [ 50.673382][ T7197] ? vprintk_func+0x8d/0x140 [ 50.677972][ T7197] kcsan_report.cold+0xc/0x10 [ 50.682636][ T7197] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.688180][ T7197] __tsan_write4+0x32/0x40 [ 50.692624][ T7197] __nf_ct_refresh_acct+0xfb/0x1b0 [ 50.697717][ T7197] nf_conntrack_tcp_packet+0xd40/0x3390 [ 50.703253][ T7197] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.708870][ T7197] nf_conntrack_in+0x410/0xa80 [ 50.713644][ T7197] ipv4_conntrack_local+0xbe/0x130 [ 50.718762][ T7197] nf_hook_slow+0x83/0x160 [ 50.723277][ T7197] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 50.728178][ T7197] __ip_local_out+0x1f7/0x2b0 [ 50.732952][ T7197] ? constant_test_bit+0x30/0x30 [ 50.737881][ T7197] ip_local_out+0x31/0x90 [ 50.742204][ T7197] __ip_queue_xmit+0x3a8/0xa40 [ 50.746954][ T7197] ip_queue_xmit+0x45/0x60 [ 50.751352][ T7197] __tcp_transmit_skb+0xe81/0x1d60 [ 50.756450][ T7197] __tcp_send_ack+0x246/0x300 [ 50.761167][ T7197] tcp_send_ack+0x34/0x40 [ 50.765482][ T7197] tcp_cleanup_rbuf+0x130/0x360 [ 50.770320][ T7197] tcp_recvmsg+0x633/0x1a30 [ 50.774835][ T7197] inet_recvmsg+0xbb/0x250 [ 50.779326][ T7197] ? __tsan_read8+0x2c/0x30 [ 50.783843][ T7197] ? inet_sendpage+0x100/0x100 [ 50.788602][ T7197] sock_recvmsg+0x92/0xb0 [ 50.792941][ T7197] sock_read_iter+0x15f/0x1e0 [ 50.797608][ T7197] new_sync_read+0x389/0x4f0 [ 50.802196][ T7197] __vfs_read+0xb1/0xc0 [ 50.806350][ T7197] vfs_read+0x143/0x2c0 [ 50.810599][ T7197] ksys_read+0xd5/0x1b0 [ 50.814873][ T7197] __x64_sys_read+0x4c/0x60 [ 50.819432][ T7197] do_syscall_64+0xcc/0x370 [ 50.823920][ T7197] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.829789][ T7197] RIP: 0033:0x47c530 [ 50.836021][ T7197] 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 [ 50.855602][ T7197] RSP: 002b:000000c4202f97d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 50.864019][ T7197] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.871978][ T7197] RDX: 0000000000001000 RSI: 000000c4200c2000 RDI: 0000000000000003 [ 50.879933][ T7197] RBP: 000000c4202f9830 R08: 0000000000000000 R09: 0000000000000000 [ 50.887918][ T7197] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 50.895868][ T7197] R13: 000000c420021c20 R14: 0000000000000002 R15: ffffffffffffffff [ 50.905377][ T7197] Kernel Offset: disabled [ 50.909764][ T7197] Rebooting in 86400 seconds..