[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 78.144587][ T31] audit: type=1800 audit(1569190696.209:25): pid=11561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 78.182239][ T31] audit: type=1800 audit(1569190696.229:26): pid=11561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 78.202489][ T31] audit: type=1800 audit(1569190696.239:27): pid=11561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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 '10.128.0.73' (ECDSA) to the list of known hosts. 2019/09/22 22:18:27 fuzzer started 2019/09/22 22:18:32 dialing manager at 10.128.0.26:45485 2019/09/22 22:18:32 syscalls: 2382 2019/09/22 22:18:32 code coverage: enabled 2019/09/22 22:18:32 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/22 22:18:32 extra coverage: enabled 2019/09/22 22:18:32 setuid sandbox: enabled 2019/09/22 22:18:32 namespace sandbox: enabled 2019/09/22 22:18:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/22 22:18:32 fault injection: enabled 2019/09/22 22:18:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/22 22:18:32 net packet injection: enabled 2019/09/22 22:18:32 net device setup: enabled syzkaller login: [ 141.470876][ C0] ================================================================== [ 141.478982][ C0] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 141.486167][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc7+ #0 [ 141.493439][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 141.503477][ C0] Call Trace: [ 141.506754][ C0] dump_stack+0x191/0x1f0 [ 141.511077][ C0] kmsan_report+0x162/0x2d0 [ 141.515577][ C0] __msan_warning+0x75/0xe0 [ 141.520059][ C0] kmem_cache_free+0x3df/0x2b70 [ 141.524900][ C0] ? kmsan_set_origin+0x6a/0xf0 [ 141.529736][ C0] ? kfree_skb+0x473/0x4c0 [ 141.534135][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 141.540202][ C0] kfree_skb+0x473/0x4c0 [ 141.544425][ C0] ? packet_rcv_spkt+0x719/0x840 [ 141.549344][ C0] packet_rcv_spkt+0x719/0x840 [ 141.554099][ C0] ? packet_rcv+0x2190/0x2190 [ 141.558755][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 141.564556][ C0] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 141.570426][ C0] ? netif_receive_skb_internal+0x383/0xc20 [ 141.576298][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 141.582020][ C0] napi_gro_receive+0x682/0xb90 [ 141.586864][ C0] receive_buf+0x653b/0x8810 [ 141.591458][ C0] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 141.597328][ C0] virtnet_poll+0x666/0x19d0 [ 141.601932][ C0] ? refill_work+0x460/0x460 [ 141.606513][ C0] net_rx_action+0x74b/0x1950 [ 141.611195][ C0] ? net_tx_action+0xba0/0xba0 [ 141.618455][ C0] __do_softirq+0x4a1/0x83a [ 141.622945][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 141.628130][ C0] ? takeover_tasklets+0x900/0x900 [ 141.633220][ C0] run_ksoftirqd+0x25/0x40 [ 141.637621][ C0] smpboot_thread_fn+0x4a3/0x990 [ 141.642556][ C0] kthread+0x4b5/0x4f0 [ 141.646604][ C0] ? cpu_report_death+0x190/0x190 [ 141.651609][ C0] ? kthread_blkcg+0xf0/0xf0 [ 141.656177][ C0] ret_from_fork+0x35/0x40 [ 141.660657][ C0] [ 141.662966][ C0] Uninit was stored to memory at: [ 141.668315][ C0] kmsan_internal_chain_origin+0xcc/0x150 [ 141.674018][ C0] __msan_chain_origin+0x6b/0xe0 [ 141.678930][ C0] ___slab_alloc+0x1dbc/0x1fb0 [ 141.683676][ C0] kmem_cache_alloc+0xade/0xd10 [ 141.688505][ C0] skb_clone+0x326/0x5d0 [ 141.692854][ C0] packet_rcv_spkt+0x245/0x840 [ 141.697615][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 141.703321][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 141.709021][ C0] napi_gro_receive+0x682/0xb90 [ 141.713852][ C0] receive_buf+0x653b/0x8810 [ 141.718428][ C0] virtnet_poll+0x666/0x19d0 [ 141.722999][ C0] net_rx_action+0x74b/0x1950 [ 141.727649][ C0] __do_softirq+0x4a1/0x83a [ 141.732215][ C0] run_ksoftirqd+0x25/0x40 [ 141.736618][ C0] smpboot_thread_fn+0x4a3/0x990 [ 141.741536][ C0] kthread+0x4b5/0x4f0 [ 141.745584][ C0] ret_from_fork+0x35/0x40 [ 141.750040][ C0] [ 141.752342][ C0] Uninit was created at: [ 141.756613][ C0] kmsan_internal_poison_shadow+0x58/0xb0 [ 141.762308][ C0] kmsan_slab_free+0x8d/0x100 [ 141.767022][ C0] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 141.772371][ C0] napi_consume_skb+0x593/0x5d0 [ 141.777199][ C0] free_old_xmit_skbs+0x1a1/0x450 [ 141.782253][ C0] virtnet_poll_tx+0x24c/0x4c0 [ 141.787003][ C0] net_rx_action+0x74b/0x1950 [ 141.791655][ C0] __do_softirq+0x4a1/0x83a [ 141.796308][ C0] irq_exit+0x230/0x280 [ 141.800498][ C0] do_IRQ+0x20d/0x3a0 [ 141.804463][ C0] ret_from_intr+0x0/0x33 [ 141.808769][ C0] default_idle+0x53/0x90 [ 141.813128][ C0] arch_cpu_idle+0x25/0x30 [ 141.817519][ C0] do_idle+0x1d7/0x790 [ 141.821561][ C0] cpu_startup_entry+0x45/0x50 [ 141.826303][ C0] start_secondary+0x370/0x470 [ 141.831060][ C0] secondary_startup_64+0xa4/0xb0 [ 141.836058][ C0] ================================================================== [ 141.844101][ C0] Disabling lock debugging due to kernel taint [ 141.850233][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 141.856823][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G B 5.3.0-rc7+ #0 [ 141.865475][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 141.875517][ C0] Call Trace: [ 141.878828][ C0] dump_stack+0x191/0x1f0 [ 141.883146][ C0] panic+0x3c9/0xc1e [ 141.887039][ C0] kmsan_report+0x2ca/0x2d0 [ 141.891868][ C0] __msan_warning+0x75/0xe0 [ 141.896355][ C0] kmem_cache_free+0x3df/0x2b70 [ 141.901181][ C0] ? kmsan_set_origin+0x6a/0xf0 [ 141.906184][ C0] ? kfree_skb+0x473/0x4c0 [ 141.911186][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 141.917239][ C0] kfree_skb+0x473/0x4c0 [ 141.921461][ C0] ? packet_rcv_spkt+0x719/0x840 [ 141.926383][ C0] packet_rcv_spkt+0x719/0x840 [ 141.931133][ C0] ? packet_rcv+0x2190/0x2190 [ 141.935798][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 141.941509][ C0] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 141.947379][ C0] ? netif_receive_skb_internal+0x383/0xc20 [ 141.953260][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 141.959054][ C0] napi_gro_receive+0x682/0xb90 [ 141.963906][ C0] receive_buf+0x653b/0x8810 [ 141.968496][ C0] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 141.974374][ C0] virtnet_poll+0x666/0x19d0 [ 141.978952][ C0] ? refill_work+0x460/0x460 [ 141.983522][ C0] net_rx_action+0x74b/0x1950 [ 141.988184][ C0] ? net_tx_action+0xba0/0xba0 [ 141.992923][ C0] __do_softirq+0x4a1/0x83a [ 141.997424][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 142.002603][ C0] ? takeover_tasklets+0x900/0x900 [ 142.007697][ C0] run_ksoftirqd+0x25/0x40 [ 142.012093][ C0] smpboot_thread_fn+0x4a3/0x990 [ 142.017039][ C0] kthread+0x4b5/0x4f0 [ 142.021085][ C0] ? cpu_report_death+0x190/0x190 [ 142.026089][ C0] ? kthread_blkcg+0xf0/0xf0 [ 142.030658][ C0] ret_from_fork+0x35/0x40 [ 142.036677][ C0] Kernel Offset: disabled [ 142.041003][ C0] Rebooting in 86400 seconds..