[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 40.264204][ T25] audit: type=1800 audit(1571708617.378:25): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 40.284015][ T25] audit: type=1800 audit(1571708617.378:26): pid=7036 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 40.305763][ T25] audit: type=1800 audit(1571708617.378:27): pid=7036 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 '10.128.10.6' (ECDSA) to the list of known hosts. 2019/10/22 01:43:47 fuzzer started 2019/10/22 01:43:49 dialing manager at 10.128.0.105:37053 2019/10/22 01:43:49 syscalls: 2524 2019/10/22 01:43:49 code coverage: enabled 2019/10/22 01:43:49 comparison tracing: enabled 2019/10/22 01:43:49 extra coverage: extra coverage is not supported by the kernel 2019/10/22 01:43:49 setuid sandbox: enabled 2019/10/22 01:43:49 namespace sandbox: enabled 2019/10/22 01:43:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 01:43:49 fault injection: enabled 2019/10/22 01:43:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 01:43:49 net packet injection: enabled 2019/10/22 01:43:49 net device setup: enabled 2019/10/22 01:43:49 concurrency sanitizer: enabled syzkaller login: [ 52.730493][ T7187] ================================================================== [ 52.739246][ T7187] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 52.747184][ T7187] [ 52.749495][ T7187] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 52.757347][ T7187] timekeeping_advance+0x893/0xd80 [ 52.762443][ T7187] update_wall_time+0x19/0x20 [ 52.767104][ T7187] tick_do_update_jiffies64+0x1ae/0x260 [ 52.772628][ T7187] tick_sched_do_timer+0xd4/0xe0 [ 52.777690][ T7187] tick_sched_timer+0x43/0xe0 [ 52.782345][ T7187] __hrtimer_run_queues+0x288/0x600 [ 52.787558][ T7187] hrtimer_interrupt+0x22a/0x480 [ 52.792530][ T7187] smp_apic_timer_interrupt+0xdc/0x280 [ 52.797964][ T7187] apic_timer_interrupt+0xf/0x20 [ 52.802963][ T7187] __kcsan_setup_watchpoint+0xd/0x4a0 [ 52.808350][ T7187] __tsan_read8+0x2c/0x30 [ 52.812669][ T7187] skb_release_all+0x2c/0x60 [ 52.817243][ T7187] kfree_skb+0x98/0x1d0 [ 52.821375][ T7187] packet_rcv_spkt+0xa2/0x310 [ 52.826019][ T7187] [ 52.828338][ T7187] read to 0xffffffff86040b80 of 8 bytes by task 7187 on cpu 0: [ 52.835853][ T7187] ktime_get_seconds+0x45/0x70 [ 52.840595][ T7187] tcp_rcv_established+0xeeb/0xf50 [ 52.845679][ T7187] tcp_v4_do_rcv+0x381/0x4e0 [ 52.850242][ T7187] __release_sock+0x135/0x1e0 [ 52.854890][ T7187] release_sock+0x61/0x160 [ 52.859292][ T7187] tcp_recvmsg+0x63b/0x1a30 [ 52.863768][ T7187] inet_recvmsg+0xbb/0x250 [ 52.868158][ T7187] sock_recvmsg+0x92/0xb0 [ 52.872492][ T7187] sock_read_iter+0x15f/0x1e0 [ 52.877144][ T7187] new_sync_read+0x389/0x4f0 [ 52.881708][ T7187] __vfs_read+0xb1/0xc0 [ 52.885855][ T7187] vfs_read+0x143/0x2c0 [ 52.889985][ T7187] ksys_read+0xd5/0x1b0 [ 52.894107][ T7187] [ 52.896407][ T7187] Reported by Kernel Concurrency Sanitizer on: [ 52.902543][ T7187] CPU: 0 PID: 7187 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 52.909968][ T7187] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.919996][ T7187] ================================================================== [ 52.928039][ T7187] Kernel panic - not syncing: panic_on_warn set ... [ 52.934602][ T7187] CPU: 0 PID: 7187 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 52.943073][ T7187] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.953098][ T7187] Call Trace: [ 52.956364][ T7187] dump_stack+0xf5/0x159 [ 52.960584][ T7187] panic+0x210/0x640 [ 52.964454][ T7187] ? sock_read_iter+0x15f/0x1e0 [ 52.969282][ T7187] ? vprintk_func+0x8d/0x140 [ 52.973869][ T7187] kcsan_report.cold+0xc/0x10 [ 52.978527][ T7187] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 52.984054][ T7187] __tsan_read8+0x2c/0x30 [ 52.988360][ T7187] ktime_get_seconds+0x45/0x70 [ 52.993098][ T7187] tcp_rcv_established+0xeeb/0xf50 [ 52.998203][ T7187] ? ipv4_dst_check+0xc6/0xf0 [ 53.002860][ T7187] tcp_v4_do_rcv+0x381/0x4e0 [ 53.007440][ T7187] __release_sock+0x135/0x1e0 [ 53.012112][ T7187] release_sock+0x61/0x160 [ 53.016506][ T7187] tcp_recvmsg+0x63b/0x1a30 [ 53.021008][ T7187] inet_recvmsg+0xbb/0x250 [ 53.025409][ T7187] ? __tsan_read8+0x2c/0x30 [ 53.029886][ T7187] ? inet_sendpage+0x100/0x100 [ 53.034627][ T7187] sock_recvmsg+0x92/0xb0 [ 53.038932][ T7187] sock_read_iter+0x15f/0x1e0 [ 53.043606][ T7187] new_sync_read+0x389/0x4f0 [ 53.048184][ T7187] __vfs_read+0xb1/0xc0 [ 53.052322][ T7187] vfs_read+0x143/0x2c0 [ 53.056479][ T7187] ksys_read+0xd5/0x1b0 [ 53.060619][ T7187] __x64_sys_read+0x4c/0x60 [ 53.065139][ T7187] do_syscall_64+0xcc/0x370 [ 53.069622][ T7187] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.075504][ T7187] RIP: 0033:0x47c530 [ 53.079393][ T7187] 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 [ 53.098977][ T7187] RSP: 002b:000000c4204e17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 53.107384][ T7187] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 53.115330][ T7187] RDX: 0000000000001000 RSI: 000000c420198000 RDI: 0000000000000003 [ 53.123275][ T7187] RBP: 000000c4204e1830 R08: 0000000000000000 R09: 0000000000000000 [ 53.131224][ T7187] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 53.139182][ T7187] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 53.148413][ T7187] Kernel Offset: disabled [ 53.152745][ T7187] Rebooting in 86400 seconds..