[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.684229][ T25] audit: type=1800 audit(1570751513.194:25): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.722698][ T25] audit: type=1800 audit(1570751513.204:26): pid=7109 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.743009][ T25] audit: type=1800 audit(1570751513.204:27): pid=7109 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 '10.128.1.20' (ECDSA) to the list of known hosts. 2019/10/10 23:52:02 fuzzer started 2019/10/10 23:52:04 dialing manager at 10.128.0.105:37331 2019/10/10 23:52:04 syscalls: 2523 2019/10/10 23:52:04 code coverage: enabled 2019/10/10 23:52:04 comparison tracing: enabled 2019/10/10 23:52:04 extra coverage: extra coverage is not supported by the kernel 2019/10/10 23:52:04 setuid sandbox: enabled 2019/10/10 23:52:04 namespace sandbox: enabled 2019/10/10 23:52:04 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 23:52:04 fault injection: enabled 2019/10/10 23:52:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 23:52:04 net packet injection: enabled 2019/10/10 23:52:04 net device setup: enabled 2019/10/10 23:52:04 concurrency sanitizer: enabled syzkaller login: [ 47.054300][ T7276] ================================================================== [ 47.062492][ T7276] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 47.070375][ T7276] [ 47.072684][ T7276] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 1: [ 47.080466][ T7276] timekeeping_advance+0x893/0xd80 [ 47.085555][ T7276] update_wall_time+0x19/0x20 [ 47.090212][ T7276] tick_do_update_jiffies64+0x1ae/0x260 [ 47.095743][ T7276] tick_sched_do_timer+0xd4/0xe0 [ 47.100692][ T7276] tick_sched_timer+0x43/0xe0 [ 47.105386][ T7276] __hrtimer_run_queues+0x288/0x600 [ 47.110560][ T7276] hrtimer_interrupt+0x22a/0x480 [ 47.115477][ T7276] smp_apic_timer_interrupt+0xdc/0x280 [ 47.120922][ T7276] apic_timer_interrupt+0xf/0x20 [ 47.125839][ T7276] __kcsan_check_watchpoint+0x25/0x180 [ 47.131271][ T7276] __tsan_read4+0x15/0x30 [ 47.135578][ T7276] tcp_v4_early_demux+0xf1/0x400 [ 47.140490][ T7276] ip_rcv_finish_core.isra.0+0x2f1/0xaf0 [ 47.146098][ T7276] ip_rcv_finish+0xe5/0x160 [ 47.150568][ T7276] [ 47.152872][ T7276] read to 0xffffffff8603db80 of 8 bytes by task 7276 on cpu 0: [ 47.160441][ T7276] ktime_get_seconds+0x49/0x60 [ 47.165231][ T7276] tcp_rcv_established+0xeeb/0xf50 [ 47.170362][ T7276] tcp_v4_do_rcv+0x381/0x4e0 [ 47.174946][ T7276] __release_sock+0x135/0x1e0 [ 47.179628][ T7276] release_sock+0x61/0x160 [ 47.184019][ T7276] tcp_recvmsg+0x63b/0x1a30 [ 47.188499][ T7276] inet_recvmsg+0xbb/0x250 [ 47.192891][ T7276] sock_recvmsg+0x92/0xb0 [ 47.197197][ T7276] sock_read_iter+0x15f/0x1e0 [ 47.201850][ T7276] new_sync_read+0x389/0x4f0 [ 47.206417][ T7276] __vfs_read+0xb1/0xc0 [ 47.210549][ T7276] vfs_read+0x143/0x2c0 [ 47.214690][ T7276] ksys_read+0xd5/0x1b0 [ 47.218816][ T7276] [ 47.221125][ T7276] Reported by Kernel Concurrency Sanitizer on: [ 47.227258][ T7276] CPU: 0 PID: 7276 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.234340][ T7276] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.244374][ T7276] ================================================================== [ 47.252508][ T7276] Kernel panic - not syncing: panic_on_warn set ... [ 47.259072][ T7276] CPU: 0 PID: 7276 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 47.266152][ T7276] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.276181][ T7276] Call Trace: [ 47.279454][ T7276] dump_stack+0xf5/0x159 [ 47.283690][ T7276] panic+0x209/0x639 [ 47.287566][ T7276] ? sock_read_iter+0x15f/0x1e0 [ 47.292391][ T7276] ? vprintk_func+0x8d/0x140 [ 47.296964][ T7276] kcsan_report.cold+0xc/0x1b [ 47.301619][ T7276] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.307152][ T7276] __tsan_read8+0x2c/0x30 [ 47.311461][ T7276] ktime_get_seconds+0x49/0x60 [ 47.316203][ T7276] tcp_rcv_established+0xeeb/0xf50 [ 47.321304][ T7276] ? ipv4_dst_check+0xc6/0xf0 [ 47.325957][ T7276] tcp_v4_do_rcv+0x381/0x4e0 [ 47.330527][ T7276] __release_sock+0x135/0x1e0 [ 47.335187][ T7276] release_sock+0x61/0x160 [ 47.339578][ T7276] tcp_recvmsg+0x63b/0x1a30 [ 47.344064][ T7276] inet_recvmsg+0xbb/0x250 [ 47.348459][ T7276] ? __tsan_read8+0x2c/0x30 [ 47.352939][ T7276] ? inet_sendpage+0x100/0x100 [ 47.357677][ T7276] sock_recvmsg+0x92/0xb0 [ 47.361982][ T7276] sock_read_iter+0x15f/0x1e0 [ 47.366642][ T7276] new_sync_read+0x389/0x4f0 [ 47.371213][ T7276] __vfs_read+0xb1/0xc0 [ 47.375357][ T7276] vfs_read+0x143/0x2c0 [ 47.379495][ T7276] ksys_read+0xd5/0x1b0 [ 47.383634][ T7276] __x64_sys_read+0x4c/0x60 [ 47.388114][ T7276] do_syscall_64+0xcf/0x2f0 [ 47.392598][ T7276] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.398464][ T7276] RIP: 0033:0x47c530 [ 47.402337][ T7276] 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 [ 47.421916][ T7276] RSP: 002b:000000c42039d810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 47.430323][ T7276] RAX: ffffffffffffffda RBX: 000000c4202cc800 RCX: 000000000047c530 [ 47.438284][ T7276] RDX: 0000000000001000 RSI: 000000c4200ac000 RDI: 0000000000000003 [ 47.446236][ T7276] RBP: 000000c42039d868 R08: 0000000000000000 R09: 0000000000000000 [ 47.454191][ T7276] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000004 [ 47.462148][ T7276] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 47.471357][ T7276] Kernel Offset: disabled [ 47.475674][ T7276] Rebooting in 86400 seconds..