[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.234723][ T25] audit: type=1800 audit(1572003552.133:25): pid=7025 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.261782][ T25] audit: type=1800 audit(1572003552.133:26): pid=7025 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.305795][ T25] audit: type=1800 audit(1572003552.133:27): pid=7025 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 '10.128.15.193' (ECDSA) to the list of known hosts. 2019/10/25 11:39:23 fuzzer started 2019/10/25 11:39:25 dialing manager at 10.128.0.105:33971 2019/10/25 11:39:25 syscalls: 2529 2019/10/25 11:39:25 code coverage: enabled 2019/10/25 11:39:25 comparison tracing: enabled 2019/10/25 11:39:25 extra coverage: extra coverage is not supported by the kernel 2019/10/25 11:39:25 setuid sandbox: enabled 2019/10/25 11:39:25 namespace sandbox: enabled 2019/10/25 11:39:25 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/25 11:39:25 fault injection: enabled 2019/10/25 11:39:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/25 11:39:25 net packet injection: enabled 2019/10/25 11:39:25 net device setup: enabled 2019/10/25 11:39:25 concurrency sanitizer: enabled 2019/10/25 11:39:27 adding functions to KCSAN blacklist: 'echo_char' 'generic_write_end' 'ktime_get_real_seconds' 'pipe_poll' '__hrtimer_run_queues' '__tcp_select_window' 'tomoyo_supervisor' 'run_timer_softirq' 'ext4_free_inodes_count' 'tcp_add_backlog' 'ext4_setattr' 'generic_permission' 'find_next_bit' syzkaller login: [ 51.576067][ T7173] ================================================================== [ 51.584244][ T7173] BUG: KCSAN: data-race in __nf_ct_refresh_acct / __nf_ct_refresh_acct [ 51.592823][ T7173] [ 51.595285][ T7173] read to 0xffff888123258708 of 4 bytes by interrupt on cpu 1: [ 51.602852][ T7173] __nf_ct_refresh_acct+0xd4/0x1b0 [ 51.607967][ T7173] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.613493][ T7173] nf_conntrack_in+0x410/0xa80 [ 51.618258][ T7173] ipv4_conntrack_in+0x27/0x40 [ 51.623001][ T7173] nf_hook_slow+0x83/0x160 [ 51.627412][ T7173] ip_rcv+0x12f/0x1a0 [ 51.631390][ T7173] __netif_receive_skb_one_core+0xa7/0xe0 [ 51.637090][ T7173] __netif_receive_skb+0x37/0xf0 [ 51.642007][ T7173] netif_receive_skb_internal+0x59/0x190 [ 51.647629][ T7173] napi_gro_receive+0x28f/0x330 [ 51.652458][ T7173] receive_buf+0x284/0x30b0 [ 51.656939][ T7173] virtnet_poll+0x436/0x7d0 [ 51.661421][ T7173] net_rx_action+0x3ae/0xa90 [ 51.665997][ T7173] __do_softirq+0x115/0x33f [ 51.671178][ T7173] [ 51.673485][ T7173] write to 0xffff888123258708 of 4 bytes by task 7173 on cpu 0: [ 51.681101][ T7173] __nf_ct_refresh_acct+0xfb/0x1b0 [ 51.686189][ T7173] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.691715][ T7173] nf_conntrack_in+0x410/0xa80 [ 51.696454][ T7173] ipv4_conntrack_local+0xbe/0x130 [ 51.701542][ T7173] nf_hook_slow+0x83/0x160 [ 51.705950][ T7173] __ip_local_out+0x1f7/0x2b0 [ 51.710617][ T7173] ip_local_out+0x31/0x90 [ 51.714927][ T7173] __ip_queue_xmit+0x3a8/0xa40 [ 51.719684][ T7173] ip_queue_xmit+0x45/0x60 [ 51.724116][ T7173] __tcp_transmit_skb+0xe81/0x1d60 [ 51.729204][ T7173] __tcp_send_ack+0x246/0x300 [ 51.733870][ T7173] tcp_send_ack+0x34/0x40 [ 51.738229][ T7173] tcp_cleanup_rbuf+0x130/0x360 [ 51.743069][ T7173] [ 51.745376][ T7173] Reported by Kernel Concurrency Sanitizer on: [ 51.751528][ T7173] CPU: 0 PID: 7173 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 51.758970][ T7173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.769016][ T7173] ================================================================== [ 51.777073][ T7173] Kernel panic - not syncing: panic_on_warn set ... [ 51.783739][ T7173] CPU: 0 PID: 7173 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 51.791168][ T7173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.801198][ T7173] Call Trace: [ 51.804486][ T7173] dump_stack+0xf5/0x159 [ 51.808711][ T7173] panic+0x210/0x640 [ 51.813030][ T7173] ? ip_queue_xmit+0x45/0x60 [ 51.817614][ T7173] ? vprintk_func+0x8d/0x140 [ 51.822189][ T7173] kcsan_report.cold+0xc/0x10 [ 51.826848][ T7173] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 51.832412][ T7173] __tsan_write4+0x32/0x40 [ 51.836822][ T7173] __nf_ct_refresh_acct+0xfb/0x1b0 [ 51.841928][ T7173] nf_conntrack_tcp_packet+0xd40/0x3390 [ 51.847464][ T7173] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 51.853077][ T7173] nf_conntrack_in+0x410/0xa80 [ 51.857826][ T7173] ipv4_conntrack_local+0xbe/0x130 [ 51.862922][ T7173] nf_hook_slow+0x83/0x160 [ 51.867330][ T7173] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 51.872171][ T7173] __ip_local_out+0x1f7/0x2b0 [ 51.876827][ T7173] ? constant_test_bit+0x30/0x30 [ 51.881767][ T7173] ip_local_out+0x31/0x90 [ 51.886782][ T7173] __ip_queue_xmit+0x3a8/0xa40 [ 51.891543][ T7173] ip_queue_xmit+0x45/0x60 [ 51.896167][ T7173] __tcp_transmit_skb+0xe81/0x1d60 [ 51.901268][ T7173] __tcp_send_ack+0x246/0x300 [ 51.906012][ T7173] tcp_send_ack+0x34/0x40 [ 51.910322][ T7173] tcp_cleanup_rbuf+0x130/0x360 [ 51.915156][ T7173] tcp_recvmsg+0x633/0x1a30 [ 51.919651][ T7173] inet_recvmsg+0xbb/0x250 [ 51.924056][ T7173] ? __tsan_read8+0x2c/0x30 [ 51.928557][ T7173] ? inet_sendpage+0x100/0x100 [ 51.933315][ T7173] sock_recvmsg+0x92/0xb0 [ 51.937638][ T7173] sock_read_iter+0x15f/0x1e0 [ 51.942295][ T7173] new_sync_read+0x389/0x4f0 [ 51.946881][ T7173] __vfs_read+0xb1/0xc0 [ 51.951016][ T7173] vfs_read+0x143/0x2c0 [ 51.955183][ T7173] ksys_read+0xd5/0x1b0 [ 51.959344][ T7173] __x64_sys_read+0x4c/0x60 [ 51.963832][ T7173] do_syscall_64+0xcc/0x370 [ 51.968319][ T7173] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 51.974212][ T7173] RIP: 0033:0x47c530 [ 51.978097][ T7173] 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 [ 51.998732][ T7173] RSP: 002b:000000c42033f810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 52.007133][ T7173] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 52.015084][ T7173] RDX: 0000000000001000 RSI: 000000c42019a000 RDI: 0000000000000003 [ 52.023031][ T7173] RBP: 000000c42033f868 R08: 0000000000000000 R09: 0000000000000000 [ 52.030991][ T7173] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 [ 52.038952][ T7173] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 52.048146][ T7173] Kernel Offset: disabled [ 52.052482][ T7173] Rebooting in 86400 seconds..