[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.708743][ T25] audit: type=1800 audit(1571246819.747:25): pid=7033 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.737262][ T25] audit: type=1800 audit(1571246819.757:26): pid=7033 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.780882][ T25] audit: type=1800 audit(1571246819.757:27): pid=7033 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 '10.128.1.36' (ECDSA) to the list of known hosts. 2019/10/16 17:27:06 fuzzer started 2019/10/16 17:27:08 dialing manager at 10.128.0.105:33899 2019/10/16 17:27:08 syscalls: 2524 2019/10/16 17:27:08 code coverage: enabled 2019/10/16 17:27:08 comparison tracing: enabled 2019/10/16 17:27:08 extra coverage: extra coverage is not supported by the kernel 2019/10/16 17:27:08 setuid sandbox: enabled 2019/10/16 17:27:08 namespace sandbox: enabled 2019/10/16 17:27:08 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 17:27:08 fault injection: enabled 2019/10/16 17:27:08 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 17:27:08 net packet injection: enabled 2019/10/16 17:27:08 net device setup: enabled 2019/10/16 17:27:08 concurrency sanitizer: enabled syzkaller login: [ 44.719061][ T7184] ================================================================== [ 44.727207][ T7184] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 44.735066][ T7184] [ 44.737413][ T7184] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 44.745227][ T7184] timekeeping_advance+0x893/0xd80 [ 44.750322][ T7184] update_wall_time+0x19/0x20 [ 44.754976][ T7184] tick_do_update_jiffies64+0x1ae/0x260 [ 44.760532][ T7184] tick_sched_do_timer+0xd4/0xe0 [ 44.765451][ T7184] tick_sched_timer+0x43/0xe0 [ 44.771365][ T7184] __hrtimer_run_queues+0x288/0x600 [ 44.776540][ T7184] hrtimer_interrupt+0x22a/0x480 [ 44.781455][ T7184] smp_apic_timer_interrupt+0xdc/0x280 [ 44.786897][ T7184] apic_timer_interrupt+0xf/0x20 [ 44.792523][ T7184] __kcsan_setup_watchpoint+0x282/0x510 [ 44.798053][ T7184] __tsan_read2+0x2c/0x30 [ 44.802364][ T7184] policy_node+0xa5/0xe0 [ 44.806581][ T7184] alloc_pages_current+0xc1/0x170 [ 44.811582][ T7184] skb_page_frag_refill+0x16f/0x260 [ 44.816758][ T7184] [ 44.819090][ T7184] read to 0xffffffff86040b80 of 8 bytes by task 7184 on cpu 1: [ 44.826625][ T7184] ktime_get_seconds+0x45/0x70 [ 44.831363][ T7184] tcp_rcv_established+0xeeb/0xf50 [ 44.836449][ T7184] tcp_v4_do_rcv+0x381/0x4e0 [ 44.841029][ T7184] __release_sock+0x135/0x1e0 [ 44.845857][ T7184] release_sock+0x61/0x160 [ 44.850249][ T7184] tcp_recvmsg+0x63b/0x1a30 [ 44.854726][ T7184] inet_recvmsg+0xbb/0x250 [ 44.859149][ T7184] sock_recvmsg+0x92/0xb0 [ 44.863452][ T7184] sock_read_iter+0x15f/0x1e0 [ 44.868104][ T7184] new_sync_read+0x389/0x4f0 [ 44.872672][ T7184] __vfs_read+0xb1/0xc0 [ 44.876807][ T7184] vfs_read+0x143/0x2c0 [ 44.880935][ T7184] ksys_read+0xd5/0x1b0 [ 44.885056][ T7184] [ 44.887364][ T7184] Reported by Kernel Concurrency Sanitizer on: [ 44.893492][ T7184] CPU: 1 PID: 7184 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.900926][ T7184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.911014][ T7184] ================================================================== [ 44.919075][ T7184] Kernel panic - not syncing: panic_on_warn set ... [ 44.925678][ T7184] CPU: 1 PID: 7184 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.933102][ T7184] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.943130][ T7184] Call Trace: [ 44.946400][ T7184] dump_stack+0xf5/0x159 [ 44.950620][ T7184] panic+0x210/0x640 [ 44.955656][ T7184] ? sock_read_iter+0x15f/0x1e0 [ 44.960487][ T7184] ? vprintk_func+0x8d/0x140 [ 44.965056][ T7184] kcsan_report.cold+0xc/0x1b [ 44.969713][ T7184] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.975232][ T7184] __tsan_read8+0x2c/0x30 [ 44.979576][ T7184] ktime_get_seconds+0x45/0x70 [ 44.984319][ T7184] tcp_rcv_established+0xeeb/0xf50 [ 44.989420][ T7184] ? ipv4_dst_check+0xc6/0xf0 [ 44.994074][ T7184] tcp_v4_do_rcv+0x381/0x4e0 [ 44.998651][ T7184] __release_sock+0x135/0x1e0 [ 45.003310][ T7184] release_sock+0x61/0x160 [ 45.007713][ T7184] tcp_recvmsg+0x63b/0x1a30 [ 45.012217][ T7184] inet_recvmsg+0xbb/0x250 [ 45.016622][ T7184] ? __tsan_read8+0x2c/0x30 [ 45.021104][ T7184] ? inet_sendpage+0x100/0x100 [ 45.025844][ T7184] sock_recvmsg+0x92/0xb0 [ 45.030150][ T7184] sock_read_iter+0x15f/0x1e0 [ 45.034804][ T7184] new_sync_read+0x389/0x4f0 [ 45.039383][ T7184] __vfs_read+0xb1/0xc0 [ 45.043519][ T7184] vfs_read+0x143/0x2c0 [ 45.047660][ T7184] ksys_read+0xd5/0x1b0 [ 45.051796][ T7184] __x64_sys_read+0x4c/0x60 [ 45.056278][ T7184] do_syscall_64+0xcc/0x370 [ 45.060758][ T7184] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.066635][ T7184] RIP: 0033:0x47c530 [ 45.070509][ T7184] 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 [ 45.090094][ T7184] RSP: 002b:000000c4204eb7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 45.098479][ T7184] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.107383][ T7184] RDX: 0000000000001000 RSI: 000000c42037c000 RDI: 0000000000000003 [ 45.115331][ T7184] RBP: 000000c4204eb830 R08: 0000000000000000 R09: 0000000000000000 [ 45.123276][ T7184] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 45.131221][ T7184] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 45.140385][ T7184] Kernel Offset: disabled [ 45.144707][ T7184] Rebooting in 86400 seconds..