[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.185171][ T25] audit: type=1800 audit(1571304034.695:25): pid=7018 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.237207][ T25] audit: type=1800 audit(1571304034.695:26): pid=7018 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.270878][ T25] audit: type=1800 audit(1571304034.695:27): pid=7018 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 '10.128.10.39' (ECDSA) to the list of known hosts. 2019/10/17 09:20:44 fuzzer started 2019/10/17 09:20:45 dialing manager at 10.128.0.105:33899 2019/10/17 09:20:45 syscalls: 2524 2019/10/17 09:20:45 code coverage: enabled 2019/10/17 09:20:45 comparison tracing: enabled 2019/10/17 09:20:45 extra coverage: extra coverage is not supported by the kernel 2019/10/17 09:20:45 setuid sandbox: enabled 2019/10/17 09:20:45 namespace sandbox: enabled 2019/10/17 09:20:45 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 09:20:45 fault injection: enabled 2019/10/17 09:20:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 09:20:45 net packet injection: enabled 2019/10/17 09:20:45 net device setup: enabled 2019/10/17 09:20:45 concurrency sanitizer: enabled syzkaller login: [ 46.127227][ C1] ================================================================== [ 46.135344][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 46.144294][ C1] [ 46.146638][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 46.154279][ C1] tick_do_update_jiffies64+0x105/0x260 [ 46.159888][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.164801][ C1] tick_sched_timer+0x43/0xe0 [ 46.169488][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.174661][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.179576][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.185009][ C1] apic_timer_interrupt+0xf/0x20 [ 46.189932][ C1] __kcsan_setup_watchpoint+0x282/0x510 [ 46.195461][ C1] __tsan_read2+0x2c/0x30 [ 46.199766][ C1] tcp_v4_early_demux+0x1f6/0x400 [ 46.204765][ C1] ip_rcv_finish_core.isra.0+0x2f1/0xaf0 [ 46.210370][ C1] ip_rcv_finish+0xe5/0x160 [ 46.214849][ C1] ip_rcv+0x18f/0x1a0 [ 46.218818][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.224515][ C1] [ 46.226819][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 46.234348][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.239792][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.244714][ C1] tick_sched_timer+0x43/0xe0 [ 46.249363][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.254533][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.259448][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.264884][ C1] apic_timer_interrupt+0xf/0x20 [ 46.269968][ C1] __tsan_read2+0xd/0x30 [ 46.274293][ C1] ipv4_conntrack_local+0x2c/0x130 [ 46.279378][ C1] nf_hook_slow+0x83/0x160 [ 46.283770][ C1] __ip_local_out+0x1f7/0x2b0 [ 46.288419][ C1] ip_local_out+0x31/0x90 [ 46.292732][ C1] __ip_queue_xmit+0x3a8/0xa40 [ 46.297465][ C1] [ 46.299765][ C1] Reported by Kernel Concurrency Sanitizer on: [ 46.305895][ C1] CPU: 1 PID: 7166 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.313666][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.323714][ C1] ================================================================== [ 46.331746][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 46.338308][ C1] CPU: 1 PID: 7166 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.345743][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.355770][ C1] Call Trace: [ 46.359031][ C1] [ 46.361874][ C1] dump_stack+0xf5/0x159 [ 46.366267][ C1] panic+0x210/0x640 [ 46.370140][ C1] ? ipv4_conntrack_local+0x2c/0x130 [ 46.375410][ C1] ? vprintk_func+0x8d/0x140 [ 46.379978][ C1] kcsan_report.cold+0xc/0x1b [ 46.384638][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.390169][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.395779][ C1] __tsan_read8+0x2c/0x30 [ 46.400106][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.405554][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.410470][ C1] tick_sched_timer+0x43/0xe0 [ 46.415131][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.420309][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 46.425397][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.430321][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.435754][ C1] ? do_IRQ+0xcb/0x180 [ 46.439809][ C1] apic_timer_interrupt+0xf/0x20 [ 46.444716][ C1] [ 46.447630][ C1] RIP: 0010:__tsan_read2+0xd/0x30 [ 46.452632][ C1] Code: 5c 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 31 d2 be 02 00 00 00 48 89 e5 41 54 <49> 89 fc e8 db 01 00 00 84 c0 75 04 41 5c 5d c3 4c 89 e7 31 d2 be [ 46.472221][ C1] RSP: 0018:ffffc90000fbf798 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 46.480607][ C1] RAX: ffff88812a8590c0 RBX: 0000000000000002 RCX: 0000000000000784 [ 46.488564][ C1] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888124a4b0b4 [ 46.496510][ C1] RBP: ffffc90000fbf7a0 R08: 0000000000000000 R09: 0000888126fbec37 [ 46.504458][ C1] R10: 00000000aaaaaaab R11: ffffffff86045e08 R12: ffff888124a4b000 [ 46.512405][ C1] R13: ffffc90000fbf828 R14: ffff888124a4b000 R15: ffffc90000fbf828 [ 46.520376][ C1] ipv4_conntrack_local+0x2c/0x130 [ 46.525553][ C1] nf_hook_slow+0x83/0x160 [ 46.529942][ C1] ? nf_ct_tcp_fixup+0xe0/0xe0 [ 46.534683][ C1] __ip_local_out+0x1f7/0x2b0 [ 46.539345][ C1] ? constant_test_bit+0x30/0x30 [ 46.544270][ C1] ip_local_out+0x31/0x90 [ 46.548586][ C1] __ip_queue_xmit+0x3a8/0xa40 [ 46.553332][ C1] ip_queue_xmit+0x45/0x60 [ 46.557727][ C1] __tcp_transmit_skb+0xe81/0x1d60 [ 46.562821][ C1] __tcp_send_ack+0x246/0x300 [ 46.567474][ C1] tcp_send_ack+0x34/0x40 [ 46.571781][ C1] tcp_cleanup_rbuf+0x130/0x360 [ 46.576609][ C1] tcp_recvmsg+0x633/0x1a30 [ 46.581113][ C1] inet_recvmsg+0xbb/0x250 [ 46.585514][ C1] ? __tsan_read8+0x2c/0x30 [ 46.590014][ C1] ? inet_sendpage+0x100/0x100 [ 46.594765][ C1] sock_recvmsg+0x92/0xb0 [ 46.599071][ C1] sock_read_iter+0x15f/0x1e0 [ 46.603729][ C1] new_sync_read+0x389/0x4f0 [ 46.608302][ C1] __vfs_read+0xb1/0xc0 [ 46.612436][ C1] vfs_read+0x143/0x2c0 [ 46.616569][ C1] ksys_read+0xd5/0x1b0 [ 46.620715][ C1] __x64_sys_read+0x4c/0x60 [ 46.625197][ C1] do_syscall_64+0xcc/0x370 [ 46.629679][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.635552][ C1] RIP: 0033:0x47c530 [ 46.639426][ C1] 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 [ 46.659010][ C1] RSP: 002b:000000c4203957d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.667401][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.675347][ C1] RDX: 0000000000001000 RSI: 000000c4202ae000 RDI: 0000000000000003 [ 46.683292][ C1] RBP: 000000c420395830 R08: 0000000000000000 R09: 0000000000000000 [ 46.691238][ C1] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 46.699185][ C1] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 46.708413][ C1] Kernel Offset: disabled [ 46.712747][ C1] Rebooting in 86400 seconds..