[ 39.068501][ T25] audit: type=1800 audit(1571295994.730:25): pid=7121 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 39.114332][ T25] audit: type=1800 audit(1571295994.730:26): pid=7121 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 39.146338][ T25] audit: type=1800 audit(1571295994.730:27): pid=7121 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. [ 39.381716][ T7185] sshd (7185) used greatest stack depth: 10136 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. 2019/10/17 07:06:44 fuzzer started 2019/10/17 07:06:45 dialing manager at 10.128.0.105:33899 2019/10/17 07:06:45 syscalls: 2524 2019/10/17 07:06:45 code coverage: enabled 2019/10/17 07:06:45 comparison tracing: enabled 2019/10/17 07:06:45 extra coverage: extra coverage is not supported by the kernel 2019/10/17 07:06:45 setuid sandbox: enabled 2019/10/17 07:06:45 namespace sandbox: enabled 2019/10/17 07:06:45 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 07:06:45 fault injection: enabled 2019/10/17 07:06:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 07:06:45 net packet injection: enabled 2019/10/17 07:06:45 net device setup: enabled 2019/10/17 07:06:45 concurrency sanitizer: enabled syzkaller login: [ 50.287390][ C1] ================================================================== [ 50.295527][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 50.304431][ C1] [ 50.306754][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 50.314373][ C1] tick_do_update_jiffies64+0x105/0x260 [ 50.319892][ C1] tick_sched_do_timer+0xd4/0xe0 [ 50.324805][ C1] tick_sched_timer+0x43/0xe0 [ 50.329459][ C1] __hrtimer_run_queues+0x288/0x600 [ 50.334652][ C1] hrtimer_interrupt+0x22a/0x480 [ 50.339628][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 50.345082][ C1] apic_timer_interrupt+0xf/0x20 [ 50.350002][ C1] __kcsan_setup_watchpoint+0x12/0x510 [ 50.355453][ C1] __tsan_read2+0x2c/0x30 [ 50.359761][ C1] virtqueue_get_buf_ctx+0x3cf/0x5c0 [ 50.365109][ C1] receive_buf+0x183e/0x30b0 [ 50.369680][ C1] virtnet_poll+0x436/0x7d0 [ 50.374170][ C1] net_rx_action+0x3ae/0xa90 [ 50.378747][ C1] __do_softirq+0x115/0x33f [ 50.383332][ C1] [ 50.385635][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 50.393155][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 50.398589][ C1] tick_sched_do_timer+0xd4/0xe0 [ 50.403509][ C1] tick_sched_timer+0x43/0xe0 [ 50.408160][ C1] __hrtimer_run_queues+0x288/0x600 [ 50.413331][ C1] hrtimer_interrupt+0x22a/0x480 [ 50.420152][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 50.425683][ C1] apic_timer_interrupt+0xf/0x20 [ 50.430598][ C1] __kcsan_check_watchpoint+0x88/0x180 [ 50.436290][ C1] __tsan_read4+0x15/0x30 [ 50.440594][ C1] tcp_rcv_established+0xba0/0xf50 [ 50.445699][ C1] tcp_v4_do_rcv+0x381/0x4e0 [ 50.450273][ C1] __release_sock+0x135/0x1e0 [ 50.454936][ C1] release_sock+0x61/0x160 [ 50.459318][ C1] [ 50.461616][ C1] Reported by Kernel Concurrency Sanitizer on: [ 50.467745][ C1] CPU: 1 PID: 7288 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.475169][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.485199][ C1] ================================================================== [ 50.493254][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 50.499818][ C1] CPU: 1 PID: 7288 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.507254][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.518323][ C1] Call Trace: [ 50.521592][ C1] [ 50.524515][ C1] dump_stack+0xf5/0x159 [ 50.528745][ C1] panic+0x210/0x640 [ 50.532617][ C1] ? __tsan_read4+0x15/0x30 [ 50.537141][ C1] ? vprintk_func+0x8d/0x140 [ 50.541722][ C1] kcsan_report.cold+0xc/0x1b [ 50.546530][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 50.552052][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.557751][ C1] __tsan_read8+0x2c/0x30 [ 50.562072][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 50.567535][ C1] tick_sched_do_timer+0xd4/0xe0 [ 50.572450][ C1] tick_sched_timer+0x43/0xe0 [ 50.577133][ C1] __hrtimer_run_queues+0x288/0x600 [ 50.582321][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 50.587423][ C1] hrtimer_interrupt+0x22a/0x480 [ 50.592354][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 50.597804][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 50.603423][ C1] apic_timer_interrupt+0xf/0x20 [ 50.608343][ C1] [ 50.611262][ C1] RIP: 0010:__kcsan_check_watchpoint+0x88/0x180 [ 50.617485][ C1] Code: ff ff ff ff ff 00 00 48 c1 ee 0c 31 d2 48 21 cf 83 e6 3f 41 ba ab aa aa aa 4e 8d 4c 37 ff 8d 42 01 48 89 c2 49 0f af c2 89 d3 <48> c1 e8 21 8d 04 40 29 c3 8d 44 1e ff 41 89 c3 41 c1 fb 1f 41 c1 [ 50.637072][ C1] RSP: 0018:ffffc9000176f940 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 50.645483][ C1] RAX: 0000000155555556 RBX: 0000000000000002 RCX: 0000ffffffffffff [ 50.653705][ C1] RDX: 0000000000000002 RSI: 0000000000000029 RDI: 00008881266e9f74 [ 50.661750][ C1] RBP: ffffc9000176f968 R08: 0000000000000000 R09: 00008881266e9f77 [ 50.669699][ C1] R10: 00000000aaaaaaab R11: ffffffff86045d68 R12: 0000000000000000 [ 50.677658][ C1] R13: ffff8881266e9f74 R14: 0000000000000004 R15: 000000000000c458 [ 50.685711][ C1] __tsan_read4+0x15/0x30 [ 50.690018][ C1] tcp_rcv_established+0xba0/0xf50 [ 50.695111][ C1] ? ipv4_dst_check+0xc6/0xf0 [ 50.699777][ C1] tcp_v4_do_rcv+0x381/0x4e0 [ 50.704371][ C1] __release_sock+0x135/0x1e0 [ 50.709031][ C1] release_sock+0x61/0x160 [ 50.713434][ C1] tcp_recvmsg+0x63b/0x1a30 [ 50.718029][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 50.723669][ C1] inet_recvmsg+0xbb/0x250 [ 50.728082][ C1] ? __tsan_read8+0x2c/0x30 [ 50.732573][ C1] ? inet_sendpage+0x100/0x100 [ 50.737325][ C1] sock_recvmsg+0x92/0xb0 [ 50.741657][ C1] sock_read_iter+0x15f/0x1e0 [ 50.746390][ C1] new_sync_read+0x389/0x4f0 [ 50.750971][ C1] __vfs_read+0xb1/0xc0 [ 50.755117][ C1] vfs_read+0x143/0x2c0 [ 50.759253][ C1] ksys_read+0xd5/0x1b0 [ 50.763434][ C1] __x64_sys_read+0x4c/0x60 [ 50.767941][ C1] do_syscall_64+0xcc/0x370 [ 50.772557][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.778450][ C1] RIP: 0033:0x47c530 [ 50.782472][ C1] 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 [ 50.802062][ C1] RSP: 002b:000000c4201f1810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 50.810456][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 50.819186][ C1] RDX: 0000000000001000 RSI: 000000c420196000 RDI: 0000000000000003 [ 50.827136][ C1] RBP: 000000c4201f1868 R08: 0000000000000000 R09: 0000000000000000 [ 50.835605][ C1] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000100 [ 50.843644][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 50.853207][ C1] Kernel Offset: disabled [ 50.857526][ C1] Rebooting in 86400 seconds..