[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.924985][ T25] audit: type=1800 audit(1571601478.989:25): pid=7013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 35.126129][ T25] audit: type=1800 audit(1571601479.189:26): pid=7013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.152320][ T25] audit: type=1800 audit(1571601479.199:27): pid=7013 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 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 19:58:10 fuzzer started 2019/10/20 19:58:12 dialing manager at 10.128.0.105:43535 2019/10/20 19:58:12 syscalls: 2524 2019/10/20 19:58:12 code coverage: enabled 2019/10/20 19:58:12 comparison tracing: enabled 2019/10/20 19:58:12 extra coverage: extra coverage is not supported by the kernel 2019/10/20 19:58:12 setuid sandbox: enabled 2019/10/20 19:58:12 namespace sandbox: enabled 2019/10/20 19:58:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/20 19:58:12 fault injection: enabled 2019/10/20 19:58:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/20 19:58:12 net packet injection: enabled 2019/10/20 19:58:12 net device setup: enabled 2019/10/20 19:58:12 concurrency sanitizer: enabled syzkaller login: [ 48.083628][ T7171] ================================================================== [ 48.091791][ T7171] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 48.099712][ T7171] [ 48.102034][ T7171] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 48.109825][ T7171] timekeeping_advance+0x893/0xd80 [ 48.114930][ T7171] update_wall_time+0x19/0x20 [ 48.119597][ T7171] tick_do_update_jiffies64+0x1ae/0x260 [ 48.125169][ T7171] tick_sched_do_timer+0xd4/0xe0 [ 48.130085][ T7171] tick_sched_timer+0x43/0xe0 [ 48.134737][ T7171] __hrtimer_run_queues+0x288/0x600 [ 48.139922][ T7171] hrtimer_interrupt+0x22a/0x480 [ 48.144837][ T7171] smp_apic_timer_interrupt+0xdc/0x280 [ 48.150271][ T7171] apic_timer_interrupt+0xf/0x20 [ 48.155186][ T7171] __sanitizer_cov_trace_const_cmp1+0x11/0x20 [ 48.161257][ T7171] sock_put+0x30/0x60 [ 48.165218][ T7171] tcp_v4_rcv+0x1a21/0x1bb0 [ 48.169697][ T7171] ip_protocol_deliver_rcu+0x4d/0x420 [ 48.175043][ T7171] ip_local_deliver_finish+0x110/0x140 [ 48.180486][ T7171] [ 48.182795][ T7171] read to 0xffffffff86040b80 of 8 bytes by task 7171 on cpu 0: [ 48.190328][ T7171] ktime_get_seconds+0x45/0x70 [ 48.195080][ T7171] tcp_rcv_established+0xeeb/0xf50 [ 48.200168][ T7171] tcp_v4_do_rcv+0x381/0x4e0 [ 48.204770][ T7171] __release_sock+0x135/0x1e0 [ 48.209429][ T7171] release_sock+0x61/0x160 [ 48.213836][ T7171] tcp_recvmsg+0x63b/0x1a30 [ 48.218315][ T7171] inet_recvmsg+0xbb/0x250 [ 48.222717][ T7171] sock_recvmsg+0x92/0xb0 [ 48.227022][ T7171] sock_read_iter+0x15f/0x1e0 [ 48.231672][ T7171] new_sync_read+0x389/0x4f0 [ 48.236269][ T7171] __vfs_read+0xb1/0xc0 [ 48.240415][ T7171] vfs_read+0x143/0x2c0 [ 48.244546][ T7171] ksys_read+0xd5/0x1b0 [ 48.248685][ T7171] [ 48.250986][ T7171] Reported by Kernel Concurrency Sanitizer on: [ 48.257215][ T7171] CPU: 0 PID: 7171 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.264650][ T7171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.274679][ T7171] ================================================================== [ 48.282782][ T7171] Kernel panic - not syncing: panic_on_warn set ... [ 48.289360][ T7171] CPU: 0 PID: 7171 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 48.296797][ T7171] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.306829][ T7171] Call Trace: [ 48.310114][ T7171] dump_stack+0xf5/0x159 [ 48.314343][ T7171] panic+0x210/0x640 [ 48.318267][ T7171] ? sock_read_iter+0x15f/0x1e0 [ 48.323097][ T7171] ? vprintk_func+0x8d/0x140 [ 48.327709][ T7171] kcsan_report.cold+0xc/0x10 [ 48.332386][ T7171] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.337940][ T7171] __tsan_read8+0x2c/0x30 [ 48.342257][ T7171] ktime_get_seconds+0x45/0x70 [ 48.347015][ T7171] tcp_rcv_established+0xeeb/0xf50 [ 48.352115][ T7171] ? ipv4_dst_check+0xc6/0xf0 [ 48.356779][ T7171] tcp_v4_do_rcv+0x381/0x4e0 [ 48.361350][ T7171] __release_sock+0x135/0x1e0 [ 48.366110][ T7171] release_sock+0x61/0x160 [ 48.370508][ T7171] tcp_recvmsg+0x63b/0x1a30 [ 48.375030][ T7171] inet_recvmsg+0xbb/0x250 [ 48.379449][ T7171] ? __tsan_read8+0x2c/0x30 [ 48.383951][ T7171] ? inet_sendpage+0x100/0x100 [ 48.388693][ T7171] sock_recvmsg+0x92/0xb0 [ 48.393005][ T7171] sock_read_iter+0x15f/0x1e0 [ 48.397665][ T7171] new_sync_read+0x389/0x4f0 [ 48.402236][ T7171] __vfs_read+0xb1/0xc0 [ 48.406370][ T7171] vfs_read+0x143/0x2c0 [ 48.410505][ T7171] ksys_read+0xd5/0x1b0 [ 48.414642][ T7171] __x64_sys_read+0x4c/0x60 [ 48.419152][ T7171] do_syscall_64+0xcc/0x370 [ 48.423659][ T7171] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.429533][ T7171] RIP: 0033:0x47c530 [ 48.433412][ T7171] 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 [ 48.453004][ T7171] RSP: 002b:000000c4201397d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.461461][ T7171] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.469417][ T7171] RDX: 0000000000001000 RSI: 000000c4203e8000 RDI: 0000000000000003 [ 48.477421][ T7171] RBP: 000000c420139830 R08: 0000000000000000 R09: 0000000000000000 [ 48.485371][ T7171] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000080 [ 48.493319][ T7171] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 48.501948][ T7171] Kernel Offset: disabled [ 48.506270][ T7171] Rebooting in 86400 seconds..