[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.829480][ T26] audit: type=1800 audit(1571725269.395:25): pid=7038 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.862270][ T26] audit: type=1800 audit(1571725269.395:26): pid=7038 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.887440][ T26] audit: type=1800 audit(1571725269.395:27): pid=7038 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 '10.128.0.34' (ECDSA) to the list of known hosts. 2019/10/22 06:21:20 fuzzer started 2019/10/22 06:21:22 dialing manager at 10.128.0.105:37053 2019/10/22 06:21:22 syscalls: 2524 2019/10/22 06:21:22 code coverage: enabled 2019/10/22 06:21:22 comparison tracing: enabled 2019/10/22 06:21:22 extra coverage: extra coverage is not supported by the kernel 2019/10/22 06:21:22 setuid sandbox: enabled 2019/10/22 06:21:22 namespace sandbox: enabled 2019/10/22 06:21:22 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 06:21:22 fault injection: enabled 2019/10/22 06:21:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 06:21:22 net packet injection: enabled 2019/10/22 06:21:22 net device setup: enabled 2019/10/22 06:21:22 concurrency sanitizer: enabled syzkaller login: [ 48.016243][ T7201] ================================================================== [ 48.024375][ T7201] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 48.032298][ T7201] [ 48.034610][ T7201] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 48.042394][ T7201] timekeeping_advance+0x893/0xd80 [ 48.047483][ T7201] update_wall_time+0x19/0x20 [ 48.052137][ T7201] tick_do_update_jiffies64+0x1ae/0x260 [ 48.057659][ T7201] tick_sched_do_timer+0xd4/0xe0 [ 48.062572][ T7201] tick_sched_timer+0x43/0xe0 [ 48.067222][ T7201] __hrtimer_run_queues+0x288/0x600 [ 48.072393][ T7201] hrtimer_interrupt+0x22a/0x480 [ 48.077307][ T7201] smp_apic_timer_interrupt+0xdc/0x280 [ 48.082741][ T7201] apic_timer_interrupt+0xf/0x20 [ 48.087654][ T7201] __kcsan_check_watchpoint+0xa2/0x180 [ 48.093087][ T7201] __tsan_read8+0x15/0x30 [ 48.097392][ T7201] nf_hook_slow+0x73/0x160 [ 48.101782][ T7201] ip_rcv+0x12f/0x1a0 [ 48.105741][ T7201] __netif_receive_skb_one_core+0xa7/0xe0 [ 48.111426][ T7201] [ 48.113734][ T7201] read to 0xffffffff86040b80 of 8 bytes by task 7201 on cpu 0: [ 48.121253][ T7201] ktime_get_seconds+0x45/0x70 [ 48.125993][ T7201] tcp_rcv_established+0xeeb/0xf50 [ 48.131082][ T7201] tcp_v4_do_rcv+0x381/0x4e0 [ 48.135660][ T7201] __release_sock+0x135/0x1e0 [ 48.140311][ T7201] release_sock+0x61/0x160 [ 48.144709][ T7201] tcp_recvmsg+0x63b/0x1a30 [ 48.149186][ T7201] inet_recvmsg+0xbb/0x250 [ 48.153578][ T7201] sock_recvmsg+0x92/0xb0 [ 48.157881][ T7201] sock_read_iter+0x15f/0x1e0 [ 48.162546][ T7201] new_sync_read+0x389/0x4f0 [ 48.167113][ T7201] __vfs_read+0xb1/0xc0 [ 48.171255][ T7201] vfs_read+0x143/0x2c0 [ 48.175385][ T7201] ksys_read+0xd5/0x1b0 [ 48.179513][ T7201] [ 48.181822][ T7201] Reported by Kernel Concurrency Sanitizer on: [ 48.187953][ T7201] CPU: 0 PID: 7201 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.196681][ T7201] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.206711][ T7201] ================================================================== [ 48.214747][ T7201] Kernel panic - not syncing: panic_on_warn set ... [ 48.221309][ T7201] CPU: 0 PID: 7201 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.228735][ T7201] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.238764][ T7201] Call Trace: [ 48.242040][ T7201] dump_stack+0xf5/0x159 [ 48.246261][ T7201] panic+0x210/0x640 [ 48.250136][ T7201] ? sock_read_iter+0x15f/0x1e0 [ 48.254962][ T7201] ? vprintk_func+0x8d/0x140 [ 48.259538][ T7201] kcsan_report.cold+0xc/0x10 [ 48.264206][ T7201] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.269732][ T7201] __tsan_read8+0x2c/0x30 [ 48.274038][ T7201] ktime_get_seconds+0x45/0x70 [ 48.278780][ T7201] tcp_rcv_established+0xeeb/0xf50 [ 48.283870][ T7201] ? ipv4_dst_check+0xc6/0xf0 [ 48.288539][ T7201] tcp_v4_do_rcv+0x381/0x4e0 [ 48.293110][ T7201] __release_sock+0x135/0x1e0 [ 48.297764][ T7201] release_sock+0x61/0x160 [ 48.302158][ T7201] tcp_recvmsg+0x63b/0x1a30 [ 48.306650][ T7201] inet_recvmsg+0xbb/0x250 [ 48.311040][ T7201] ? __tsan_read8+0x2c/0x30 [ 48.315521][ T7201] ? inet_sendpage+0x100/0x100 [ 48.320265][ T7201] sock_recvmsg+0x92/0xb0 [ 48.324588][ T7201] sock_read_iter+0x15f/0x1e0 [ 48.329263][ T7201] new_sync_read+0x389/0x4f0 [ 48.333835][ T7201] __vfs_read+0xb1/0xc0 [ 48.337974][ T7201] vfs_read+0x143/0x2c0 [ 48.342108][ T7201] ksys_read+0xd5/0x1b0 [ 48.346247][ T7201] __x64_sys_read+0x4c/0x60 [ 48.350745][ T7201] do_syscall_64+0xcc/0x370 [ 48.355226][ T7201] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.361093][ T7201] RIP: 0033:0x47c530 [ 48.364969][ T7201] 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 [ 48.384561][ T7201] RSP: 002b:000000c4202d3810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 48.392959][ T7201] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.400980][ T7201] RDX: 0000000000001000 RSI: 000000c4200d6000 RDI: 0000000000000003 [ 48.408927][ T7201] RBP: 000000c4202d3868 R08: 0000000000000000 R09: 0000000000000000 [ 48.416923][ T7201] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 48.424908][ T7201] R13: 000000c4200207b0 R14: 0000000000000002 R15: ffffffffffffffff [ 48.434201][ T7201] Kernel Offset: disabled [ 48.438518][ T7201] Rebooting in 86400 seconds..