[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.682697][ T25] audit: type=1800 audit(1571595680.751:25): pid=7076 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.729180][ T25] audit: type=1800 audit(1571595680.751:26): pid=7076 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 41.753597][ T25] audit: type=1800 audit(1571595680.751:27): pid=7076 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2019/10/20 18:21:27 fuzzer started 2019/10/20 18:21:29 dialing manager at 10.128.0.105:43535 2019/10/20 18:21:29 syscalls: 2524 2019/10/20 18:21:29 code coverage: enabled 2019/10/20 18:21:29 comparison tracing: enabled 2019/10/20 18:21:29 extra coverage: extra coverage is not supported by the kernel 2019/10/20 18:21:29 setuid sandbox: enabled 2019/10/20 18:21:29 namespace sandbox: enabled 2019/10/20 18:21:29 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/20 18:21:29 fault injection: enabled 2019/10/20 18:21:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/20 18:21:29 net packet injection: enabled 2019/10/20 18:21:29 net device setup: enabled 2019/10/20 18:21:29 concurrency sanitizer: enabled syzkaller login: [ 50.130829][ T7227] ================================================================== [ 50.138932][ T7227] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 50.146799][ T7227] [ 50.149151][ T7227] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 50.156930][ T7227] timekeeping_advance+0x893/0xd80 [ 50.162014][ T7227] update_wall_time+0x19/0x20 [ 50.166668][ T7227] tick_do_update_jiffies64+0x1ae/0x260 [ 50.172189][ T7227] tick_sched_do_timer+0xd4/0xe0 [ 50.177100][ T7227] tick_sched_timer+0x43/0xe0 [ 50.181756][ T7227] __hrtimer_run_queues+0x288/0x600 [ 50.186929][ T7227] hrtimer_interrupt+0x22a/0x480 [ 50.191885][ T7227] smp_apic_timer_interrupt+0xdc/0x280 [ 50.197319][ T7227] apic_timer_interrupt+0xf/0x20 [ 50.202237][ T7227] kcsan_is_atomic+0x0/0x10 [ 50.206720][ T7227] __tsan_read8+0x2c/0x30 [ 50.211029][ T7227] skb_release_data+0x62/0x3a0 [ 50.215772][ T7227] skb_release_all+0x44/0x60 [ 50.220340][ T7227] kfree_skb+0x98/0x1d0 [ 50.224463][ T7227] [ 50.226773][ T7227] read to 0xffffffff86040b80 of 8 bytes by task 7227 on cpu 0: [ 50.234293][ T7227] ktime_get_seconds+0x45/0x70 [ 50.239044][ T7227] tcp_rcv_established+0xeeb/0xf50 [ 50.244133][ T7227] tcp_v4_do_rcv+0x381/0x4e0 [ 50.248699][ T7227] __release_sock+0x135/0x1e0 [ 50.253355][ T7227] release_sock+0x61/0x160 [ 50.257743][ T7227] tcp_recvmsg+0x63b/0x1a30 [ 50.262220][ T7227] inet_recvmsg+0xbb/0x250 [ 50.266612][ T7227] sock_recvmsg+0x92/0xb0 [ 50.270918][ T7227] sock_read_iter+0x15f/0x1e0 [ 50.275571][ T7227] new_sync_read+0x389/0x4f0 [ 50.280131][ T7227] __vfs_read+0xb1/0xc0 [ 50.284261][ T7227] vfs_read+0x143/0x2c0 [ 50.288391][ T7227] ksys_read+0xd5/0x1b0 [ 50.292524][ T7227] [ 50.294838][ T7227] Reported by Kernel Concurrency Sanitizer on: [ 50.300966][ T7227] CPU: 0 PID: 7227 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.308390][ T7227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.318415][ T7227] ================================================================== [ 50.326449][ T7227] Kernel panic - not syncing: panic_on_warn set ... [ 50.333019][ T7227] CPU: 0 PID: 7227 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.340444][ T7227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.350472][ T7227] Call Trace: [ 50.353746][ T7227] dump_stack+0xf5/0x159 [ 50.357973][ T7227] panic+0x210/0x640 [ 50.361848][ T7227] ? sock_read_iter+0x15f/0x1e0 [ 50.367281][ T7227] ? vprintk_func+0x8d/0x140 [ 50.371852][ T7227] kcsan_report.cold+0xc/0x10 [ 50.376506][ T7227] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.382025][ T7227] __tsan_read8+0x2c/0x30 [ 50.386330][ T7227] ktime_get_seconds+0x45/0x70 [ 50.391068][ T7227] tcp_rcv_established+0xeeb/0xf50 [ 50.396160][ T7227] ? ipv4_dst_check+0xc6/0xf0 [ 50.400830][ T7227] tcp_v4_do_rcv+0x381/0x4e0 [ 50.405396][ T7227] __release_sock+0x135/0x1e0 [ 50.410051][ T7227] release_sock+0x61/0x160 [ 50.414446][ T7227] tcp_recvmsg+0x63b/0x1a30 [ 50.418935][ T7227] ? debug_smp_processor_id+0x4c/0x172 [ 50.424384][ T7227] inet_recvmsg+0xbb/0x250 [ 50.428776][ T7227] ? __tsan_read8+0x2c/0x30 [ 50.433257][ T7227] ? inet_sendpage+0x100/0x100 [ 50.437997][ T7227] sock_recvmsg+0x92/0xb0 [ 50.442304][ T7227] sock_read_iter+0x15f/0x1e0 [ 50.446962][ T7227] new_sync_read+0x389/0x4f0 [ 50.451552][ T7227] __vfs_read+0xb1/0xc0 [ 50.455682][ T7227] vfs_read+0x143/0x2c0 [ 50.459824][ T7227] ksys_read+0xd5/0x1b0 [ 50.463967][ T7227] __x64_sys_read+0x4c/0x60 [ 50.468447][ T7227] do_syscall_64+0xcc/0x370 [ 50.472929][ T7227] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.478795][ T7227] RIP: 0033:0x47c530 [ 50.482680][ T7227] 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 [ 50.502258][ T7227] RSP: 002b:000000c4203bf7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 50.510641][ T7227] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.518586][ T7227] RDX: 0000000000001000 RSI: 000000c420196000 RDI: 0000000000000003 [ 50.526542][ T7227] RBP: 000000c4203bf830 R08: 0000000000000000 R09: 0000000000000000 [ 50.534490][ T7227] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000100 [ 50.542438][ T7227] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 50.551644][ T7227] Kernel Offset: disabled [ 50.555966][ T7227] Rebooting in 86400 seconds..