[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 80.299374][ T31] audit: type=1800 audit(1567151235.353:25): pid=11389 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 80.323143][ T31] audit: type=1800 audit(1567151235.383:26): pid=11389 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 80.357810][ T31] audit: type=1800 audit(1567151235.403:27): pid=11389 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 '10.128.0.133' (ECDSA) to the list of known hosts. 2019/08/30 07:47:27 fuzzer started 2019/08/30 07:47:32 dialing manager at 10.128.0.26:40947 2019/08/30 07:47:33 syscalls: 2376 2019/08/30 07:47:33 code coverage: enabled 2019/08/30 07:47:33 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/08/30 07:47:33 extra coverage: enabled 2019/08/30 07:47:33 setuid sandbox: enabled 2019/08/30 07:47:33 namespace sandbox: enabled 2019/08/30 07:47:33 Android sandbox: /sys/fs/selinux/policy does not exist 2019/08/30 07:47:33 fault injection: enabled 2019/08/30 07:47:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/08/30 07:47:33 net packet injection: enabled 2019/08/30 07:47:33 net device setup: enabled syzkaller login: [ 204.632256][ C0] ================================================================== [ 204.640380][ C0] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 204.647591][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc6+ #18 [ 204.654963][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 204.665019][ C0] Call Trace: [ 204.668332][ C0] dump_stack+0x191/0x1f0 [ 204.672687][ C0] kmsan_report+0x162/0x2d0 [ 204.677221][ C0] __msan_warning+0x75/0xe0 [ 204.681750][ C0] kmem_cache_free+0x3df/0x2b70 [ 204.686616][ C0] ? kfree_skb+0x473/0x4c0 [ 204.691047][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 204.697149][ C0] kfree_skb+0x473/0x4c0 [ 204.701403][ C0] ? packet_rcv_spkt+0x719/0x840 [ 204.706361][ C0] packet_rcv_spkt+0x719/0x840 [ 204.711154][ C0] ? packet_rcv+0x2190/0x2190 [ 204.715843][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 204.721602][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 204.727579][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 204.733287][ C0] napi_gro_receive+0x682/0xb90 [ 204.738125][ C0] receive_buf+0x653b/0x8810 [ 204.742709][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 204.748671][ C0] virtnet_poll+0x666/0x19d0 [ 204.753260][ C0] ? refill_work+0x460/0x460 [ 204.757836][ C0] net_rx_action+0x74b/0x1950 [ 204.762523][ C0] ? net_tx_action+0xba0/0xba0 [ 204.767264][ C0] __do_softirq+0x4a1/0x83a [ 204.771749][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 204.776946][ C0] ? takeover_tasklets+0x900/0x900 [ 204.782041][ C0] run_ksoftirqd+0x25/0x40 [ 204.786438][ C0] smpboot_thread_fn+0x4a3/0x990 [ 204.791365][ C0] kthread+0x4b5/0x4f0 [ 204.795428][ C0] ? cpu_report_death+0x190/0x190 [ 204.800429][ C0] ? kthread_blkcg+0xf0/0xf0 [ 204.805008][ C0] ret_from_fork+0x35/0x40 [ 204.809409][ C0] [ 204.811711][ C0] Uninit was stored to memory at: [ 204.816717][ C0] kmsan_internal_chain_origin+0xcc/0x150 [ 204.822520][ C0] __msan_chain_origin+0x6b/0xe0 [ 204.827448][ C0] ___slab_alloc+0x1dbc/0x1fb0 [ 204.832202][ C0] kmem_cache_alloc+0xade/0xd10 [ 204.837022][ C0] skb_clone+0x326/0x5d0 [ 204.841327][ C0] packet_rcv_spkt+0x245/0x840 [ 204.846064][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 204.851755][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 204.857445][ C0] napi_gro_receive+0x682/0xb90 [ 204.862268][ C0] receive_buf+0x653b/0x8810 [ 204.866830][ C0] virtnet_poll+0x666/0x19d0 [ 204.871393][ C0] net_rx_action+0x74b/0x1950 [ 204.876047][ C0] __do_softirq+0x4a1/0x83a [ 204.880523][ C0] run_ksoftirqd+0x25/0x40 [ 204.884913][ C0] smpboot_thread_fn+0x4a3/0x990 [ 204.889821][ C0] kthread+0x4b5/0x4f0 [ 204.893862][ C0] ret_from_fork+0x35/0x40 [ 204.898254][ C0] [ 204.900566][ C0] Uninit was created at: [ 204.904789][ C0] kmsan_internal_poison_shadow+0x53/0xa0 [ 204.910479][ C0] kmsan_slab_free+0x8d/0x100 [ 204.915129][ C0] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 204.920473][ C0] napi_consume_skb+0x593/0x5d0 [ 204.925298][ C0] free_old_xmit_skbs+0x1a1/0x450 [ 204.930294][ C0] virtnet_poll_tx+0x24c/0x4c0 [ 204.935030][ C0] net_rx_action+0x74b/0x1950 [ 204.939684][ C0] __do_softirq+0x4a1/0x83a [ 204.944157][ C0] irq_exit+0x230/0x280 [ 204.948284][ C0] do_IRQ+0x20d/0x3a0 [ 204.952237][ C0] ret_from_intr+0x0/0x33 [ 204.956540][ C0] default_idle+0x53/0x90 [ 204.960843][ C0] arch_cpu_idle+0x25/0x30 [ 204.965234][ C0] do_idle+0x1d7/0x790 [ 204.969280][ C0] cpu_startup_entry+0x45/0x50 [ 204.974024][ C0] start_secondary+0x370/0x470 [ 204.978758][ C0] secondary_startup_64+0xa4/0xb0 [ 204.983750][ C0] ================================================================== [ 204.991781][ C0] Disabling lock debugging due to kernel taint [ 204.997904][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 205.004469][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G B 5.3.0-rc6+ #18 [ 205.013208][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 205.023234][ C0] Call Trace: [ 205.026504][ C0] dump_stack+0x191/0x1f0 [ 205.030813][ C0] panic+0x3c9/0xc1e [ 205.034699][ C0] kmsan_report+0x2ca/0x2d0 [ 205.039180][ C0] __msan_warning+0x75/0xe0 [ 205.043667][ C0] kmem_cache_free+0x3df/0x2b70 [ 205.048492][ C0] ? kfree_skb+0x473/0x4c0 [ 205.052880][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 205.058932][ C0] kfree_skb+0x473/0x4c0 [ 205.063150][ C0] ? packet_rcv_spkt+0x719/0x840 [ 205.068063][ C0] packet_rcv_spkt+0x719/0x840 [ 205.072809][ C0] ? packet_rcv+0x2190/0x2190 [ 205.077459][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 205.083172][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 205.089129][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 205.094848][ C0] napi_gro_receive+0x682/0xb90 [ 205.099688][ C0] receive_buf+0x653b/0x8810 [ 205.104331][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 205.110307][ C0] virtnet_poll+0x666/0x19d0 [ 205.114887][ C0] ? refill_work+0x460/0x460 [ 205.119452][ C0] net_rx_action+0x74b/0x1950 [ 205.124111][ C0] ? net_tx_action+0xba0/0xba0 [ 205.128850][ C0] __do_softirq+0x4a1/0x83a [ 205.133358][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 205.138625][ C0] ? takeover_tasklets+0x900/0x900 [ 205.143710][ C0] run_ksoftirqd+0x25/0x40 [ 205.148099][ C0] smpboot_thread_fn+0x4a3/0x990 [ 205.153033][ C0] kthread+0x4b5/0x4f0 [ 205.157077][ C0] ? cpu_report_death+0x190/0x190 [ 205.162079][ C0] ? kthread_blkcg+0xf0/0xf0 [ 205.166657][ C0] ret_from_fork+0x35/0x40 [ 205.172186][ C0] Kernel Offset: disabled [ 205.176504][ C0] Rebooting in 86400 seconds..