[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.643063][ T25] audit: type=1800 audit(1570861223.645:25): pid=7074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.662875][ T25] audit: type=1800 audit(1570861223.645:26): pid=7074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 41.684712][ T25] audit: type=1800 audit(1570861223.645:27): pid=7074 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 '10.128.10.12' (ECDSA) to the list of known hosts. 2019/10/12 06:20:35 fuzzer started 2019/10/12 06:20:36 dialing manager at 10.128.0.105:43913 2019/10/12 06:20:36 syscalls: 2523 2019/10/12 06:20:36 code coverage: enabled 2019/10/12 06:20:36 comparison tracing: enabled 2019/10/12 06:20:36 extra coverage: extra coverage is not supported by the kernel 2019/10/12 06:20:36 setuid sandbox: enabled 2019/10/12 06:20:36 namespace sandbox: enabled 2019/10/12 06:20:36 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 06:20:36 fault injection: enabled 2019/10/12 06:20:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 06:20:36 net packet injection: enabled 2019/10/12 06:20:36 net device setup: enabled 2019/10/12 06:20:36 concurrency sanitizer: enabled syzkaller login: [ 54.248674][ C1] ================================================================== [ 54.256928][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 54.265514][ C1] [ 54.268030][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 54.275856][ C1] tick_sched_do_timer+0xc0/0xe0 [ 54.280792][ C1] tick_sched_timer+0x43/0xe0 [ 54.285682][ C1] __hrtimer_run_queues+0x288/0x600 [ 54.290958][ C1] hrtimer_interrupt+0x22a/0x480 [ 54.296127][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 54.301734][ C1] apic_timer_interrupt+0xf/0x20 [ 54.306833][ C1] __kcsan_setup_watchpoint+0xc0/0x510 [ 54.312415][ C1] __tsan_read8+0x2c/0x30 [ 54.316785][ C1] ipv4_conntrack_defrag+0x81/0x350 [ 54.322190][ C1] nf_hook_slow+0x83/0x160 [ 54.326759][ C1] ip_rcv+0x12f/0x1a0 [ 54.330734][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 54.336521][ C1] __netif_receive_skb+0x37/0xf0 [ 54.341627][ C1] netif_receive_skb_internal+0x59/0x190 [ 54.347416][ C1] [ 54.349982][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 54.357826][ C1] tick_sched_do_timer+0x33/0xe0 [ 54.362770][ C1] tick_sched_timer+0x43/0xe0 [ 54.367483][ C1] __hrtimer_run_queues+0x288/0x600 [ 54.373211][ C1] hrtimer_interrupt+0x22a/0x480 [ 54.378386][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 54.383997][ C1] apic_timer_interrupt+0xf/0x20 [ 54.389245][ C1] __kcsan_check_watchpoint+0xa9/0x180 [ 54.394928][ C1] __tsan_read8+0x15/0x30 [ 54.399453][ C1] new_sync_read+0x37b/0x4f0 [ 54.404232][ C1] __vfs_read+0xb1/0xc0 [ 54.408376][ C1] vfs_read+0x143/0x2c0 [ 54.412522][ C1] ksys_read+0xd5/0x1b0 [ 54.416759][ C1] __x64_sys_read+0x4c/0x60 [ 54.422431][ C1] [ 54.424940][ C1] Reported by Kernel Concurrency Sanitizer on: [ 54.431539][ C1] CPU: 1 PID: 7224 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.439105][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.449455][ C1] ================================================================== [ 54.457802][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 54.464988][ C1] CPU: 1 PID: 7224 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.472712][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.483088][ C1] Call Trace: [ 54.486413][ C1] [ 54.489263][ C1] dump_stack+0xf5/0x159 [ 54.493508][ C1] panic+0x209/0x639 [ 54.497394][ C1] ? new_sync_read+0x37b/0x4f0 [ 54.502663][ C1] ? vprintk_func+0x8d/0x140 [ 54.507598][ C1] kcsan_report.cold+0xc/0x1b [ 54.512430][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 54.517973][ C1] __tsan_read4+0x2c/0x30 [ 54.522439][ C1] tick_sched_do_timer+0x33/0xe0 [ 54.527365][ C1] tick_sched_timer+0x43/0xe0 [ 54.532076][ C1] __hrtimer_run_queues+0x288/0x600 [ 54.537353][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 54.542853][ C1] hrtimer_interrupt+0x22a/0x480 [ 54.548012][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 54.553501][ C1] apic_timer_interrupt+0xf/0x20 [ 54.558516][ C1] [ 54.561502][ C1] RIP: 0010:__kcsan_check_watchpoint+0xa9/0x180 [ 54.567821][ C1] Code: 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 eb 1a 44 01 d8 83 e0 3f 44 29 d8 <48> 98 4c 8d 1c c5 20 2c 04 86 48 8b 04 c5 20 2c 04 86 48 83 f8 01 [ 54.587544][ C1] RSP: 0018:ffffc90001b57d08 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 54.595947][ C1] RAX: 0000000000000030 RBX: 0000000000000001 RCX: 0000ffffffffffff [ 54.604055][ C1] RDX: 0000000000000001 RSI: 0000000000000030 RDI: 0000ffff85170cc0 [ 54.612275][ C1] RBP: ffffc90001b57d30 R08: 0000000000000000 R09: 0000ffff85170cc7 [ 54.620336][ C1] R10: 00000000aaaaaaab R11: 0000000000000000 R12: 0000000000000000 [ 54.628646][ C1] R13: ffffffff85170cc0 R14: 0000000000000008 R15: 0000000000001000 [ 54.636883][ C1] __tsan_read8+0x15/0x30 [ 54.641209][ C1] new_sync_read+0x37b/0x4f0 [ 54.645797][ C1] __vfs_read+0xb1/0xc0 [ 54.650135][ C1] vfs_read+0x143/0x2c0 [ 54.654532][ C1] ksys_read+0xd5/0x1b0 [ 54.658824][ C1] __x64_sys_read+0x4c/0x60 [ 54.663400][ C1] do_syscall_64+0xcf/0x2f0 [ 54.668003][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.674051][ C1] RIP: 0033:0x47c530 [ 54.678299][ 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 [ 54.698197][ C1] RSP: 002b:000000c42014f810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 54.706600][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 54.714681][ C1] RDX: 0000000000001000 RSI: 000000c420056000 RDI: 0000000000000003 [ 54.722686][ C1] RBP: 000000c42014f868 R08: 0000000000000000 R09: 0000000000000000 [ 54.730694][ C1] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 [ 54.739011][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 54.748711][ C1] Kernel Offset: disabled [ 54.753043][ C1] Rebooting in 86400 seconds..