[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.873753][ T26] audit: type=1800 audit(1571159440.333:25): pid=7083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.911500][ T26] audit: type=1800 audit(1571159440.333:26): pid=7083 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 39.959600][ T26] audit: type=1800 audit(1571159440.333:27): pid=7083 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 '10.128.0.167' (ECDSA) to the list of known hosts. 2019/10/15 17:10:49 fuzzer started 2019/10/15 17:10:50 dialing manager at 10.128.0.105:38903 2019/10/15 17:10:50 syscalls: 2523 2019/10/15 17:10:50 code coverage: enabled 2019/10/15 17:10:50 comparison tracing: enabled 2019/10/15 17:10:50 extra coverage: extra coverage is not supported by the kernel 2019/10/15 17:10:50 setuid sandbox: enabled 2019/10/15 17:10:50 namespace sandbox: enabled 2019/10/15 17:10:50 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 17:10:50 fault injection: enabled 2019/10/15 17:10:50 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 17:10:50 net packet injection: enabled 2019/10/15 17:10:50 net device setup: enabled 2019/10/15 17:10:50 concurrency sanitizer: enabled syzkaller login: [ 49.779473][ T7236] ================================================================== [ 49.787585][ T7236] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 49.795449][ T7236] [ 49.797771][ T7236] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 0: [ 49.805555][ T7236] timekeeping_advance+0x893/0xd80 [ 49.810722][ T7236] update_wall_time+0x19/0x20 [ 49.815413][ T7236] tick_do_update_jiffies64+0x1ae/0x260 [ 49.820935][ T7236] tick_sched_do_timer+0xd4/0xe0 [ 49.825850][ T7236] tick_sched_timer+0x43/0xe0 [ 49.830514][ T7236] __hrtimer_run_queues+0x288/0x600 [ 49.835688][ T7236] hrtimer_interrupt+0x22a/0x480 [ 49.840610][ T7236] smp_apic_timer_interrupt+0xdc/0x280 [ 49.846047][ T7236] apic_timer_interrupt+0xf/0x20 [ 49.850966][ T7236] __sanitizer_cov_trace_pc+0x14/0x50 [ 49.857100][ T7236] tcp_v4_rcv+0x469/0x1bf0 [ 49.861498][ T7236] ip_protocol_deliver_rcu+0x51/0x470 [ 49.866848][ T7236] ip_local_deliver_finish+0x110/0x140 [ 49.872282][ T7236] ip_local_deliver+0x133/0x210 [ 49.877104][ T7236] [ 49.879416][ T7236] read to 0xffffffff8603db80 of 8 bytes by task 7236 on cpu 1: [ 49.886934][ T7236] ktime_get_seconds+0x49/0x60 [ 49.891773][ T7236] tcp_rcv_established+0xeeb/0xf50 [ 49.896878][ T7236] tcp_v4_do_rcv+0x381/0x4e0 [ 49.901445][ T7236] __release_sock+0x135/0x1e0 [ 49.906105][ T7236] release_sock+0x61/0x160 [ 49.910496][ T7236] tcp_recvmsg+0x63b/0x1a30 [ 49.914986][ T7236] inet_recvmsg+0xbb/0x250 [ 49.919382][ T7236] sock_recvmsg+0x92/0xb0 [ 49.923691][ T7236] sock_read_iter+0x15f/0x1e0 [ 49.929067][ T7236] new_sync_read+0x389/0x4f0 [ 49.933652][ T7236] __vfs_read+0xb1/0xc0 [ 49.938076][ T7236] vfs_read+0x143/0x2c0 [ 49.942216][ T7236] ksys_read+0xd5/0x1b0 [ 49.946341][ T7236] [ 49.948650][ T7236] Reported by Kernel Concurrency Sanitizer on: [ 49.954959][ T7236] CPU: 1 PID: 7236 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.962038][ T7236] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.972075][ T7236] ================================================================== [ 49.980116][ T7236] Kernel panic - not syncing: panic_on_warn set ... [ 49.986679][ T7236] CPU: 1 PID: 7236 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.993757][ T7236] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.003785][ T7236] Call Trace: [ 50.007053][ T7236] dump_stack+0xf5/0x159 [ 50.011275][ T7236] panic+0x209/0x639 [ 50.015147][ T7236] ? sock_read_iter+0x15f/0x1e0 [ 50.019972][ T7236] ? vprintk_func+0x8d/0x140 [ 50.024556][ T7236] kcsan_report.cold+0xc/0x1b [ 50.029210][ T7236] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.035429][ T7236] __tsan_read8+0x2c/0x30 [ 50.039735][ T7236] ktime_get_seconds+0x49/0x60 [ 50.044479][ T7236] tcp_rcv_established+0xeeb/0xf50 [ 50.049580][ T7236] ? ipv4_dst_check+0xc6/0xf0 [ 50.054236][ T7236] tcp_v4_do_rcv+0x381/0x4e0 [ 50.058814][ T7236] __release_sock+0x135/0x1e0 [ 50.063473][ T7236] release_sock+0x61/0x160 [ 50.067864][ T7236] tcp_recvmsg+0x63b/0x1a30 [ 50.072359][ T7236] ? debug_smp_processor_id+0x4c/0x172 [ 50.077825][ T7236] inet_recvmsg+0xbb/0x250 [ 50.082216][ T7236] ? __tsan_read8+0x2c/0x30 [ 50.086699][ T7236] ? inet_sendpage+0x100/0x100 [ 50.091437][ T7236] sock_recvmsg+0x92/0xb0 [ 50.095752][ T7236] sock_read_iter+0x15f/0x1e0 [ 50.100413][ T7236] new_sync_read+0x389/0x4f0 [ 50.104985][ T7236] __vfs_read+0xb1/0xc0 [ 50.109642][ T7236] vfs_read+0x143/0x2c0 [ 50.113775][ T7236] ksys_read+0xd5/0x1b0 [ 50.117905][ T7236] __x64_sys_read+0x4c/0x60 [ 50.122397][ T7236] do_syscall_64+0xcf/0x2f0 [ 50.126886][ T7236] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.132763][ T7236] RIP: 0033:0x47c530 [ 50.136636][ T7236] 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 [ 50.156384][ T7236] RSP: 002b:000000c420329810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 50.164776][ T7236] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.172725][ T7236] RDX: 0000000000001000 RSI: 000000c420182000 RDI: 0000000000000003 [ 50.180765][ T7236] RBP: 000000c420329868 R08: 0000000000000000 R09: 0000000000000000 [ 50.188719][ T7236] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000007 [ 50.196672][ T7236] R13: 000000c4200208c0 R14: 0000000000000004 R15: ffffffffffffffff [ 50.205873][ T7236] Kernel Offset: disabled [ 50.210205][ T7236] Rebooting in 86400 seconds..