[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 81.250208][ T31] audit: type=1800 audit(1567182341.301:25): pid=11582 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 81.274549][ T31] audit: type=1800 audit(1567182341.331:26): pid=11582 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 81.308988][ T31] audit: type=1800 audit(1567182341.351:27): pid=11582 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 '10.128.0.102' (ECDSA) to the list of known hosts. 2019/08/30 16:25:54 fuzzer started 2019/08/30 16:26:00 dialing manager at 10.128.0.26:40947 2019/08/30 16:26:00 syscalls: 2376 2019/08/30 16:26:00 code coverage: enabled 2019/08/30 16:26:00 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/08/30 16:26:00 extra coverage: enabled 2019/08/30 16:26:00 setuid sandbox: enabled 2019/08/30 16:26:00 namespace sandbox: enabled 2019/08/30 16:26:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/08/30 16:26:00 fault injection: enabled 2019/08/30 16:26:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/08/30 16:26:00 net packet injection: enabled 2019/08/30 16:26:00 net device setup: enabled syzkaller login: [ 147.254175][ C0] ================================================================== [ 147.262410][ C0] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 147.269633][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc6+ #18 [ 147.277009][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 147.287093][ C0] Call Trace: [ 147.290429][ C0] dump_stack+0x191/0x1f0 [ 147.294799][ C0] kmsan_report+0x162/0x2d0 [ 147.299333][ C0] __msan_warning+0x75/0xe0 [ 147.303881][ C0] kmem_cache_free+0x3df/0x2b70 [ 147.308761][ C0] ? kfree_skb+0x473/0x4c0 [ 147.313167][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 147.319224][ C0] kfree_skb+0x473/0x4c0 [ 147.323607][ C0] ? packet_rcv_spkt+0x719/0x840 [ 147.328527][ C0] packet_rcv_spkt+0x719/0x840 [ 147.333451][ C0] ? packet_rcv+0x2190/0x2190 [ 147.338107][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 147.343848][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 147.349822][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 147.355535][ C0] napi_gro_receive+0x682/0xb90 [ 147.360396][ C0] receive_buf+0x653b/0x8810 [ 147.364992][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 147.370984][ C0] virtnet_poll+0x666/0x19d0 [ 147.375658][ C0] ? refill_work+0x460/0x460 [ 147.380238][ C0] net_rx_action+0x74b/0x1950 [ 147.384932][ C0] ? net_tx_action+0xba0/0xba0 [ 147.389678][ C0] __do_softirq+0x4a1/0x83a [ 147.394190][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 147.399381][ C0] ? takeover_tasklets+0x900/0x900 [ 147.404483][ C0] run_ksoftirqd+0x25/0x40 [ 147.408896][ C0] smpboot_thread_fn+0x4a3/0x990 [ 147.413851][ C0] kthread+0x4b5/0x4f0 [ 147.418646][ C0] ? cpu_report_death+0x190/0x190 [ 147.423657][ C0] ? kthread_blkcg+0xf0/0xf0 [ 147.428226][ C0] ret_from_fork+0x35/0x40 [ 147.432623][ C0] [ 147.434930][ C0] Uninit was stored to memory at: [ 147.439953][ C0] kmsan_internal_chain_origin+0xcc/0x150 [ 147.445647][ C0] __msan_chain_origin+0x6b/0xe0 [ 147.450568][ C0] ___slab_alloc+0x1dbc/0x1fb0 [ 147.455310][ C0] kmem_cache_alloc+0xade/0xd10 [ 147.460138][ C0] skb_clone+0x326/0x5d0 [ 147.464372][ C0] packet_rcv_spkt+0x245/0x840 [ 147.469204][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 147.474904][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 147.480602][ C0] napi_gro_receive+0x682/0xb90 [ 147.485436][ C0] receive_buf+0x653b/0x8810 [ 147.490008][ C0] virtnet_poll+0x666/0x19d0 [ 147.494584][ C0] net_rx_action+0x74b/0x1950 [ 147.499246][ C0] __do_softirq+0x4a1/0x83a [ 147.503767][ C0] run_ksoftirqd+0x25/0x40 [ 147.508175][ C0] smpboot_thread_fn+0x4a3/0x990 [ 147.513091][ C0] kthread+0x4b5/0x4f0 [ 147.517171][ C0] ret_from_fork+0x35/0x40 [ 147.521555][ C0] [ 147.523861][ C0] Uninit was created at: [ 147.528087][ C0] kmsan_internal_poison_shadow+0x53/0xa0 [ 147.533784][ C0] kmsan_slab_free+0x8d/0x100 [ 147.538458][ C0] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 147.543815][ C0] __kfree_skb_flush+0xb0/0x100 [ 147.548650][ C0] net_rx_action+0x1908/0x1950 [ 147.553399][ C0] __do_softirq+0x4a1/0x83a [ 147.557892][ C0] run_ksoftirqd+0x25/0x40 [ 147.562290][ C0] smpboot_thread_fn+0x4a3/0x990 [ 147.567206][ C0] kthread+0x4b5/0x4f0 [ 147.571282][ C0] ret_from_fork+0x35/0x40 [ 147.575670][ C0] ================================================================== [ 147.583714][ C0] Disabling lock debugging due to kernel taint [ 147.589862][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 147.596433][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G B 5.3.0-rc6+ #18 [ 147.605262][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 147.615295][ C0] Call Trace: [ 147.618577][ C0] dump_stack+0x191/0x1f0 [ 147.622894][ C0] panic+0x3c9/0xc1e [ 147.626782][ C0] kmsan_report+0x2ca/0x2d0 [ 147.631269][ C0] __msan_warning+0x75/0xe0 [ 147.635763][ C0] kmem_cache_free+0x3df/0x2b70 [ 147.640599][ C0] ? kfree_skb+0x473/0x4c0 [ 147.644997][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 147.651084][ C0] kfree_skb+0x473/0x4c0 [ 147.655406][ C0] ? packet_rcv_spkt+0x719/0x840 [ 147.660453][ C0] packet_rcv_spkt+0x719/0x840 [ 147.665207][ C0] ? packet_rcv+0x2190/0x2190 [ 147.669876][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 147.675602][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 147.681581][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 147.687419][ C0] napi_gro_receive+0x682/0xb90 [ 147.692356][ C0] receive_buf+0x653b/0x8810 [ 147.696951][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 147.702999][ C0] virtnet_poll+0x666/0x19d0 [ 147.707584][ C0] ? refill_work+0x460/0x460 [ 147.712251][ C0] net_rx_action+0x74b/0x1950 [ 147.716944][ C0] ? net_tx_action+0xba0/0xba0 [ 147.725160][ C0] __do_softirq+0x4a1/0x83a [ 147.729693][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 147.734887][ C0] ? takeover_tasklets+0x900/0x900 [ 147.739999][ C0] run_ksoftirqd+0x25/0x40 [ 147.744405][ C0] smpboot_thread_fn+0x4a3/0x990 [ 147.749330][ C0] kthread+0x4b5/0x4f0 [ 147.753386][ C0] ? cpu_report_death+0x190/0x190 [ 147.758390][ C0] ? kthread_blkcg+0xf0/0xf0 [ 147.762982][ C0] ret_from_fork+0x35/0x40 [ 147.769279][ C0] Kernel Offset: disabled [ 147.773625][ C0] Rebooting in 86400 seconds..