[ 43.408087][ T25] audit: type=1800 audit(1572468474.885:24): pid=7116 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 44.003480][ T25] audit: type=1800 audit(1572468475.555:25): pid=7116 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 44.038227][ T25] audit: type=1800 audit(1572468475.555:26): pid=7116 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.124' (ECDSA) to the list of known hosts. 2019/10/30 20:48:05 fuzzer started 2019/10/30 20:48:07 dialing manager at 10.128.0.105:37477 2019/10/30 20:48:07 syscalls: 2540 2019/10/30 20:48:07 code coverage: enabled 2019/10/30 20:48:07 comparison tracing: enabled 2019/10/30 20:48:07 extra coverage: extra coverage is not supported by the kernel 2019/10/30 20:48:07 setuid sandbox: enabled 2019/10/30 20:48:07 namespace sandbox: enabled 2019/10/30 20:48:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/30 20:48:07 fault injection: enabled 2019/10/30 20:48:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/30 20:48:07 net packet injection: enabled 2019/10/30 20:48:07 net device setup: enabled 2019/10/30 20:48:07 concurrency sanitizer: enabled 2019/10/30 20:48:10 adding functions to KCSAN blacklist: '__hrtimer_run_queues' 'mod_timer' 'tomoyo_supervisor' 'tcp_add_backlog' 'tick_do_update_jiffies64' '__tcp_select_window' 'pid_update_inode' 'find_next_bit' 'do_nanosleep' syzkaller login: [ 59.320671][ T7270] ================================================================== [ 59.328804][ T7270] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 59.337023][ T7270] [ 59.339337][ T7270] read to 0xffff8881255aac08 of 4 bytes by interrupt on cpu 0: [ 59.346858][ T7270] __nf_ct_refresh_acct+0xd4/0x1b0 [ 59.351946][ T7270] nf_conntrack_tcp_packet+0xd40/0x3390 [ 59.357563][ T7270] nf_conntrack_in+0x410/0xa80 [ 59.362323][ T7270] ipv4_conntrack_in+0x27/0x40 [ 59.367068][ T7270] nf_hook_slow+0x83/0x160 [ 59.371719][ T7270] ip_rcv+0x12f/0x1a0 [ 59.375676][ T7270] __netif_receive_skb_one_core+0xa7/0xe0 [ 59.381379][ T7270] __netif_receive_skb+0x37/0xf0 [ 59.386307][ T7270] netif_receive_skb_internal+0x59/0x190 [ 59.391926][ T7270] napi_gro_receive+0x28f/0x330 [ 59.396769][ T7270] receive_buf+0x284/0x30b0 [ 59.401258][ T7270] virtnet_poll+0x436/0x7d0 [ 59.405748][ T7270] net_rx_action+0x3ae/0xa90 [ 59.410325][ T7270] __do_softirq+0x115/0x33f [ 59.414795][ T7270] [ 59.417103][ T7270] write to 0xffff8881255aac08 of 4 bytes by task 7270 on cpu 1: [ 59.424713][ T7270] __nf_ct_refresh_acct+0xfb/0x1b0 [ 59.429807][ T7270] nf_conntrack_tcp_packet+0xd40/0x3390 [ 59.435326][ T7270] nf_conntrack_in+0x410/0xa80 [ 59.440077][ T7270] ipv4_conntrack_local+0xbe/0x130 [ 59.445185][ T7270] nf_hook_slow+0x83/0x160 [ 59.449600][ T7270] __ip_local_out+0x1f7/0x2b0 [ 59.454273][ T7270] ip_local_out+0x31/0x90 [ 59.458589][ T7270] __ip_queue_xmit+0x3a8/0xa40 [ 59.463337][ T7270] ip_queue_xmit+0x45/0x60 [ 59.467728][ T7270] __tcp_transmit_skb+0xe81/0x1d60 [ 59.472812][ T7270] __tcp_send_ack+0x246/0x300 [ 59.477471][ T7270] tcp_send_ack+0x34/0x40 [ 59.481777][ T7270] tcp_cleanup_rbuf+0x130/0x360 [ 59.486594][ T7270] [ 59.488903][ T7270] Reported by Kernel Concurrency Sanitizer on: [ 59.495041][ T7270] CPU: 1 PID: 7270 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 59.503885][ T7270] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.513944][ T7270] ================================================================== [ 59.521982][ T7270] Kernel panic - not syncing: panic_on_warn set ... [ 59.528547][ T7270] CPU: 1 PID: 7270 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 59.535981][ T7270] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.546009][ T7270] Call Trace: [ 59.549289][ T7270] dump_stack+0xf5/0x159 [ 59.553510][ T7270] panic+0x210/0x640 [ 59.557387][ T7270] ? ip_queue_xmit+0x45/0x60 [ 59.561953][ T7270] ? vprintk_func+0x8d/0x140 [ 59.566531][ T7270] kcsan_report.cold+0xc/0x10 [ 59.571196][ T7270] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 59.576718][ T7270] __tsan_write4+0x32/0x40 [ 59.581116][ T7270] __nf_ct_refresh_acct+0xfb/0x1b0 [ 59.586205][ T7270] nf_conntrack_tcp_packet+0xd40/0x3390 [ 59.591735][ T7270] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 59.597393][ T7270] nf_conntrack_in+0x410/0xa80 [ 59.602146][ T7270] ipv4_conntrack_local+0xbe/0x130 [ 59.607234][ T7270] nf_hook_slow+0x83/0x160 [ 59.611638][ T7270] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 59.616379][ T7270] __ip_local_out+0x1f7/0x2b0 [ 59.621048][ T7270] ? constant_test_bit+0x30/0x30 [ 59.625963][ T7270] ip_local_out+0x31/0x90 [ 59.630268][ T7270] __ip_queue_xmit+0x3a8/0xa40 [ 59.635026][ T7270] ip_queue_xmit+0x45/0x60 [ 59.639430][ T7270] __tcp_transmit_skb+0xe81/0x1d60 [ 59.644531][ T7270] __tcp_send_ack+0x246/0x300 [ 59.649184][ T7270] tcp_send_ack+0x34/0x40 [ 59.653516][ T7270] tcp_cleanup_rbuf+0x130/0x360 [ 59.658348][ T7270] tcp_recvmsg+0x633/0x1a30 [ 59.662836][ T7270] inet_recvmsg+0xbb/0x250 [ 59.667236][ T7270] ? __tsan_read8+0x2c/0x30 [ 59.671716][ T7270] ? inet_sendpage+0x100/0x100 [ 59.676460][ T7270] sock_recvmsg+0x92/0xb0 [ 59.680774][ T7270] sock_read_iter+0x15f/0x1e0 [ 59.685444][ T7270] new_sync_read+0x389/0x4f0 [ 59.690021][ T7270] __vfs_read+0xb1/0xc0 [ 59.694156][ T7270] vfs_read+0x143/0x2c0 [ 59.698300][ T7270] ksys_read+0xd5/0x1b0 [ 59.702432][ T7270] __x64_sys_read+0x4c/0x60 [ 59.706924][ T7270] do_syscall_64+0xcc/0x370 [ 59.711415][ T7270] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 59.717280][ T7270] RIP: 0033:0x47c530 [ 59.721156][ T7270] 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 [ 59.740832][ T7270] RSP: 002b:000000c4203c3810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 59.749226][ T7270] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 59.757188][ T7270] RDX: 0000000000001000 RSI: 000000c4202ee000 RDI: 0000000000000003 [ 59.765141][ T7270] RBP: 000000c4203c3868 R08: 0000000000000000 R09: 0000000000000000 [ 59.773089][ T7270] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000020 [ 59.781047][ T7270] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 59.790283][ T7270] Kernel Offset: disabled [ 59.794680][ T7270] Rebooting in 86400 seconds..