[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.029112][ T23] audit: type=1800 audit(1570861033.822:25): pid=7054 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.063766][ T23] audit: type=1800 audit(1570861033.822:26): pid=7054 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.083786][ T23] audit: type=1800 audit(1570861033.822:27): pid=7054 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 '10.128.0.103' (ECDSA) to the list of known hosts. 2019/10/12 06:17:23 fuzzer started 2019/10/12 06:17:24 dialing manager at 10.128.0.105:43913 2019/10/12 06:17:24 syscalls: 2523 2019/10/12 06:17:24 code coverage: enabled 2019/10/12 06:17:24 comparison tracing: enabled 2019/10/12 06:17:24 extra coverage: extra coverage is not supported by the kernel 2019/10/12 06:17:24 setuid sandbox: enabled 2019/10/12 06:17:24 namespace sandbox: enabled 2019/10/12 06:17:24 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 06:17:24 fault injection: enabled 2019/10/12 06:17:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 06:17:24 net packet injection: enabled 2019/10/12 06:17:24 net device setup: enabled 2019/10/12 06:17:24 concurrency sanitizer: enabled syzkaller login: [ 45.805093][ T7208] ================================================================== [ 45.813213][ T7208] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 45.821198][ T7208] [ 45.823505][ T7208] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 0: [ 45.831292][ T7208] timekeeping_advance+0x893/0xd80 [ 45.836376][ T7208] update_wall_time+0x19/0x20 [ 45.841053][ T7208] tick_do_update_jiffies64+0x1ae/0x260 [ 45.846572][ T7208] tick_sched_do_timer+0xd4/0xe0 [ 45.851483][ T7208] tick_sched_timer+0x43/0xe0 [ 45.856137][ T7208] __hrtimer_run_queues+0x288/0x600 [ 45.861354][ T7208] hrtimer_interrupt+0x22a/0x480 [ 45.866307][ T7208] smp_apic_timer_interrupt+0xdc/0x280 [ 45.871740][ T7208] apic_timer_interrupt+0xf/0x20 [ 45.876662][ T7208] __sanitizer_cov_trace_pc+0x14/0x50 [ 45.882010][ T7208] ipt_do_table+0x554/0xe40 [ 45.886487][ T7208] iptable_raw_hook+0x4a/0x60 [ 45.891153][ T7208] nf_hook_slow+0x83/0x160 [ 45.895542][ T7208] ip_rcv+0x12f/0x1a0 [ 45.899493][ T7208] [ 45.901800][ T7208] read to 0xffffffff8603db80 of 8 bytes by task 7208 on cpu 1: [ 45.909313][ T7208] ktime_get_seconds+0x49/0x60 [ 45.914053][ T7208] tcp_rcv_established+0xeeb/0xf50 [ 45.919137][ T7208] tcp_v4_do_rcv+0x381/0x4e0 [ 45.923720][ T7208] __release_sock+0x135/0x1e0 [ 45.928371][ T7208] release_sock+0x61/0x160 [ 45.932771][ T7208] tcp_recvmsg+0x63b/0x1a30 [ 45.937248][ T7208] inet_recvmsg+0xbb/0x250 [ 45.941637][ T7208] sock_recvmsg+0x92/0xb0 [ 45.945937][ T7208] sock_read_iter+0x15f/0x1e0 [ 45.950590][ T7208] new_sync_read+0x389/0x4f0 [ 45.955167][ T7208] __vfs_read+0xb1/0xc0 [ 45.959310][ T7208] vfs_read+0x143/0x2c0 [ 45.963438][ T7208] ksys_read+0xd5/0x1b0 [ 45.967560][ T7208] [ 45.969862][ T7208] Reported by Kernel Concurrency Sanitizer on: [ 45.975989][ T7208] CPU: 1 PID: 7208 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.983066][ T7208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.993093][ T7208] ================================================================== [ 46.001141][ T7208] Kernel panic - not syncing: panic_on_warn set ... [ 46.007702][ T7208] CPU: 1 PID: 7208 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.014783][ T7208] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.024822][ T7208] Call Trace: [ 46.028092][ T7208] dump_stack+0xf5/0x159 [ 46.032315][ T7208] panic+0x209/0x639 [ 46.036186][ T7208] ? sock_read_iter+0x15f/0x1e0 [ 46.041012][ T7208] ? vprintk_func+0x8d/0x140 [ 46.045584][ T7208] kcsan_report.cold+0xc/0x1b [ 46.050240][ T7208] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.055762][ T7208] __tsan_read8+0x2c/0x30 [ 46.060067][ T7208] ktime_get_seconds+0x49/0x60 [ 46.064809][ T7208] tcp_rcv_established+0xeeb/0xf50 [ 46.069903][ T7208] ? ipv4_dst_check+0xc6/0xf0 [ 46.074569][ T7208] tcp_v4_do_rcv+0x381/0x4e0 [ 46.079138][ T7208] __release_sock+0x135/0x1e0 [ 46.083792][ T7208] release_sock+0x61/0x160 [ 46.088183][ T7208] tcp_recvmsg+0x63b/0x1a30 [ 46.092674][ T7208] inet_recvmsg+0xbb/0x250 [ 46.097065][ T7208] ? __tsan_read8+0x2c/0x30 [ 46.101544][ T7208] ? inet_sendpage+0x100/0x100 [ 46.106282][ T7208] sock_recvmsg+0x92/0xb0 [ 46.110587][ T7208] sock_read_iter+0x15f/0x1e0 [ 46.115262][ T7208] new_sync_read+0x389/0x4f0 [ 46.119833][ T7208] __vfs_read+0xb1/0xc0 [ 46.123966][ T7208] vfs_read+0x143/0x2c0 [ 46.128111][ T7208] ksys_read+0xd5/0x1b0 [ 46.132256][ T7208] __x64_sys_read+0x4c/0x60 [ 46.136736][ T7208] do_syscall_64+0xcf/0x2f0 [ 46.141234][ T7208] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.147099][ T7208] RIP: 0033:0x47c530 [ 46.150974][ T7208] 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 [ 46.170561][ T7208] RSP: 002b:000000c4202d37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 46.179046][ T7208] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 46.186992][ T7208] RDX: 0000000000001000 RSI: 000000c420318000 RDI: 0000000000000003 [ 46.194957][ T7208] RBP: 000000c4202d3830 R08: 0000000000000000 R09: 0000000000000000 [ 46.202929][ T7208] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000200 [ 46.210877][ T7208] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.220139][ T7208] Kernel Offset: disabled [ 46.224455][ T7208] Rebooting in 86400 seconds..