[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.049196][ T25] audit: type=1800 audit(1570847005.033:25): pid=7055 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.068987][ T25] audit: type=1800 audit(1570847005.033:26): pid=7055 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.090685][ T25] audit: type=1800 audit(1570847005.033:27): pid=7055 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 '10.128.0.235' (ECDSA) to the list of known hosts. 2019/10/12 02:24:32 fuzzer started 2019/10/12 02:24:32 dialing manager at 10.128.0.105:43913 2019/10/12 02:24:32 syscalls: 2523 2019/10/12 02:24:32 code coverage: enabled 2019/10/12 02:24:32 comparison tracing: enabled 2019/10/12 02:24:32 extra coverage: extra coverage is not supported by the kernel 2019/10/12 02:24:32 setuid sandbox: enabled 2019/10/12 02:24:32 namespace sandbox: enabled 2019/10/12 02:24:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 02:24:32 fault injection: enabled 2019/10/12 02:24:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 02:24:32 net packet injection: enabled 2019/10/12 02:24:32 net device setup: enabled 2019/10/12 02:24:32 concurrency sanitizer: enabled syzkaller login: [ 102.437862][ C0] ================================================================== [ 102.446101][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 102.454180][ C0] [ 102.456501][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 102.464127][ C0] tick_sched_do_timer+0xc0/0xe0 [ 102.469071][ C0] tick_sched_timer+0x43/0xe0 [ 102.473801][ C0] __hrtimer_run_queues+0x288/0x600 [ 102.479037][ C0] hrtimer_interrupt+0x22a/0x480 [ 102.483972][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 102.489426][ C0] apic_timer_interrupt+0xf/0x20 [ 102.494360][ C0] __kcsan_setup_watchpoint+0x282/0x510 [ 102.499897][ C0] __tsan_write8+0x32/0x40 [ 102.504304][ C0] skb_gro_reset_offset+0x6e/0x1a0 [ 102.509408][ C0] napi_gro_receive+0x71/0x330 [ 102.514164][ C0] receive_buf+0x284/0x30b0 [ 102.518661][ C0] virtnet_poll+0x436/0x7d0 [ 102.523158][ C0] net_rx_action+0x3ae/0xa50 [ 102.527828][ C0] __do_softirq+0x115/0x33f [ 102.532315][ C0] [ 102.534638][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 102.542175][ C0] tick_sched_do_timer+0x33/0xe0 [ 102.547162][ C0] tick_sched_timer+0x43/0xe0 [ 102.551836][ C0] __hrtimer_run_queues+0x288/0x600 [ 102.557072][ C0] hrtimer_interrupt+0x22a/0x480 [ 102.562005][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 102.567499][ C0] apic_timer_interrupt+0xf/0x20 [ 102.572431][ C0] _raw_spin_lock_bh+0x2a/0x70 [ 102.577216][ C0] lock_sock_nested+0x32/0xb0 [ 102.581885][ C0] tcp_recvmsg+0xac/0x1a30 [ 102.586294][ C0] inet_recvmsg+0xbb/0x250 [ 102.590762][ C0] sock_recvmsg+0x92/0xb0 [ 102.595125][ C0] sock_read_iter+0x15f/0x1e0 [ 102.599807][ C0] new_sync_read+0x389/0x4f0 [ 102.604379][ C0] [ 102.606711][ C0] Reported by Kernel Concurrency Sanitizer on: [ 102.612943][ C0] CPU: 0 PID: 7210 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 102.620042][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 102.630172][ C0] ================================================================== [ 102.638225][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 102.644805][ C0] CPU: 0 PID: 7210 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 102.651901][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 102.661947][ C0] Call Trace: [ 102.665220][ C0] [ 102.668072][ C0] dump_stack+0xf5/0x159 [ 102.672363][ C0] panic+0x209/0x639 [ 102.676252][ C0] ? tcp_recvmsg+0xac/0x1a30 [ 102.680840][ C0] ? vprintk_func+0x8d/0x140 [ 102.685427][ C0] kcsan_report.cold+0xc/0x1b [ 102.690102][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 102.695642][ C0] __tsan_read4+0x2c/0x30 [ 102.699967][ C0] tick_sched_do_timer+0x33/0xe0 [ 102.704902][ C0] tick_sched_timer+0x43/0xe0 [ 102.709573][ C0] __hrtimer_run_queues+0x288/0x600 [ 102.714776][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 102.719887][ C0] hrtimer_interrupt+0x22a/0x480 [ 102.724825][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 102.730280][ C0] apic_timer_interrupt+0xf/0x20 [ 102.735202][ C0] [ 102.738199][ C0] RIP: 0010:_raw_spin_lock_bh+0x2a/0x70 [ 102.743745][ C0] Code: 55 48 89 e5 53 48 89 fb 48 83 ec 08 48 8b 7d 08 e8 8b 32 bf fc bf 01 02 00 00 e8 01 79 a0 fc 31 c0 ba 01 00 00 00 f0 0f b1 13 <75> 0c e8 7f 32 bf fc 48 83 c4 08 5b 5d c3 48 c7 c7 80 5b a5 85 89 [ 102.763341][ C0] RSP: 0018:ffffc9000167fab8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 102.771980][ C0] RAX: 0000000000000000 RBX: ffff88812a27d2c8 RCX: ffffffff83ed4cdb [ 102.779952][ C0] RDX: 0000000000000001 RSI: ffffffff83ac4fba RDI: ffffffff83ac4fc2 [ 102.787983][ C0] RBP: ffffc9000167fac8 R08: ffff888126a18000 R09: 000088812a27d347 [ 102.795954][ C0] R10: 00000000aaaaaaab R11: ffffffff86042e00 R12: ffff88812a27d2c8 [ 102.803921][ C0] R13: ffff88812a27d2cc R14: 0000000000000000 R15: ffff88812a27d240 [ 102.811898][ C0] ? tcp_recvmsg+0x8b/0x1a30 [ 102.816484][ C0] ? lock_sock_nested+0x2a/0xb0 [ 102.821329][ C0] ? lock_sock_nested+0x32/0xb0 [ 102.826215][ C0] ? _raw_spin_lock_bh+0x1f/0x70 [ 102.831149][ C0] lock_sock_nested+0x32/0xb0 [ 102.835816][ C0] tcp_recvmsg+0xac/0x1a30 [ 102.840232][ C0] ? __tsan_read8+0x2c/0x30 [ 102.844727][ C0] ? aa_sk_perm+0x1a4/0x450 [ 102.849228][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 102.854859][ C0] inet_recvmsg+0xbb/0x250 [ 102.859297][ C0] ? __tsan_read8+0x2c/0x30 [ 102.863841][ C0] ? inet_sendpage+0x100/0x100 [ 102.868601][ C0] sock_recvmsg+0x92/0xb0 [ 102.872927][ C0] sock_read_iter+0x15f/0x1e0 [ 102.877644][ C0] new_sync_read+0x389/0x4f0 [ 102.882279][ C0] __vfs_read+0xb1/0xc0 [ 102.886463][ C0] vfs_read+0x143/0x2c0 [ 102.890643][ C0] ksys_read+0xd5/0x1b0 [ 102.894796][ C0] __x64_sys_read+0x4c/0x60 [ 102.899326][ C0] do_syscall_64+0xcf/0x2f0 [ 102.903829][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 102.909711][ C0] RIP: 0033:0x47c530 [ 102.913612][ C0] 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 [ 102.933209][ C0] RSP: 002b:000000c4203bf7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 102.941613][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 102.949615][ C0] RDX: 0000000000001000 RSI: 000000c4202d6000 RDI: 0000000000000003 [ 102.957582][ C0] RBP: 000000c4203bf830 R08: 0000000000000000 R09: 0000000000000000 [ 102.965545][ C0] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 102.973511][ C0] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 102.983048][ C0] Kernel Offset: disabled [ 102.988000][ C0] Rebooting in 86400 seconds..