[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 90.858602][ T32] audit: type=1800 audit(1569950925.933:25): pid=12107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 90.892881][ T32] audit: type=1800 audit(1569950925.953:26): pid=12107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 90.913124][ T32] audit: type=1800 audit(1569950925.963:27): pid=12107 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 '10.128.0.2' (ECDSA) to the list of known hosts. 2019/10/01 17:28:59 fuzzer started 2019/10/01 17:29:04 dialing manager at 10.128.0.26:39785 2019/10/01 17:29:07 syscalls: 2412 2019/10/01 17:29:07 code coverage: enabled 2019/10/01 17:29:07 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/10/01 17:29:07 extra coverage: enabled 2019/10/01 17:29:07 setuid sandbox: enabled 2019/10/01 17:29:07 namespace sandbox: enabled 2019/10/01 17:29:07 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/01 17:29:07 fault injection: enabled 2019/10/01 17:29:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/01 17:29:07 net packet injection: enabled 2019/10/01 17:29:07 net device setup: enabled syzkaller login: [ 237.262063][ C1] ===================================================== [ 237.269229][ C1] BUG: KMSAN: uninit-value in kfree_skb+0x473/0x4c0 [ 237.275807][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc7+ #0 [ 237.283161][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 237.293214][ C1] Call Trace: [ 237.296585][ C1] dump_stack+0x191/0x1f0 [ 237.300992][ C1] kmsan_report+0x13a/0x2b0 [ 237.305477][ C1] __msan_warning+0x73/0xe0 [ 237.309961][ C1] kmem_cache_free+0x3df/0x2b70 [ 237.315232][ C1] ? kmsan_internal_set_origin+0x6a/0xb0 [ 237.320844][ C1] ? kfree_skb+0x473/0x4c0 [ 237.325238][ C1] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 237.331290][ C1] kfree_skb+0x473/0x4c0 [ 237.335586][ C1] ? packet_rcv_spkt+0x719/0x840 [ 237.340508][ C1] packet_rcv_spkt+0x719/0x840 [ 237.345255][ C1] ? packet_rcv+0x2190/0x2190 [ 237.349954][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 237.355668][ C1] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 237.361543][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 237.367247][ C1] napi_gro_receive+0x682/0xb90 [ 237.373058][ C1] receive_buf+0x653b/0x8810 [ 237.377816][ C1] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 237.383713][ C1] virtnet_poll+0x666/0x19d0 [ 237.388667][ C1] ? refill_work+0x460/0x460 [ 237.393234][ C1] net_rx_action+0x74b/0x1950 [ 237.397914][ C1] ? net_tx_action+0xba0/0xba0 [ 237.402737][ C1] __do_softirq+0x4a1/0x83a [ 237.407234][ C1] ? ksoftirqd_should_run+0x30/0x30 [ 237.412413][ C1] ? takeover_tasklets+0x900/0x900 [ 237.417513][ C1] run_ksoftirqd+0x25/0x40 [ 237.421911][ C1] smpboot_thread_fn+0x4a3/0x990 [ 237.426832][ C1] kthread+0x4b5/0x4f0 [ 237.430888][ C1] ? cpu_report_death+0x190/0x190 [ 237.435897][ C1] ? kthread_blkcg+0xf0/0xf0 [ 237.440502][ C1] ret_from_fork+0x35/0x40 [ 237.444911][ C1] [ 237.447994][ C1] Uninit was stored to memory at: [ 237.453000][ C1] kmsan_internal_chain_origin+0xd2/0x170 [ 237.458711][ C1] __msan_chain_origin+0x6b/0xe0 [ 237.463639][ C1] ___slab_alloc+0x1dbc/0x1fb0 [ 237.468660][ C1] kmem_cache_alloc+0xade/0xd10 [ 237.473495][ C1] skb_clone+0x326/0x5d0 [ 237.477730][ C1] packet_rcv_spkt+0x245/0x840 [ 237.482480][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 237.488182][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 237.493900][ C1] napi_gro_receive+0x682/0xb90 [ 237.498836][ C1] receive_buf+0x653b/0x8810 [ 237.503418][ C1] virtnet_poll+0x666/0x19d0 [ 237.507984][ C1] net_rx_action+0x74b/0x1950 [ 237.512644][ C1] __do_softirq+0x4a1/0x83a [ 237.517143][ C1] run_ksoftirqd+0x25/0x40 [ 237.521537][ C1] smpboot_thread_fn+0x4a3/0x990 [ 237.527074][ C1] kthread+0x4b5/0x4f0 [ 237.531151][ C1] ret_from_fork+0x35/0x40 [ 237.535543][ C1] [ 237.537857][ C1] Uninit was created at: [ 237.542080][ C1] kmsan_internal_poison_shadow+0x53/0x100 [ 237.547868][ C1] kmsan_slab_free+0x8d/0x100 [ 237.552524][ C1] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 237.557873][ C1] napi_consume_skb+0x593/0x5d0 [ 237.562702][ C1] free_old_xmit_skbs+0x1a1/0x450 [ 237.567715][ C1] virtnet_poll_tx+0x24c/0x4c0 [ 237.572454][ C1] net_rx_action+0x74b/0x1950 [ 237.577106][ C1] __do_softirq+0x4a1/0x83a [ 237.582205][ C1] irq_exit+0x230/0x280 [ 237.586334][ C1] do_IRQ+0x20d/0x3a0 [ 237.590289][ C1] ret_from_intr+0x0/0x33 [ 237.594592][ C1] default_idle+0x53/0x90 [ 237.598895][ C1] arch_cpu_idle+0x25/0x30 [ 237.603288][ C1] do_idle+0x1d7/0x790 [ 237.607333][ C1] cpu_startup_entry+0x45/0x50 [ 237.612173][ C1] rest_init+0x1be/0x1f0 [ 237.616965][ C1] arch_call_rest_init+0x13/0x15 [ 237.621879][ C1] start_kernel+0x991/0xb61 [ 237.626355][ C1] x86_64_start_reservations+0x18/0x2e [ 237.631785][ C1] x86_64_start_kernel+0x81/0x84 [ 237.636706][ C1] secondary_startup_64+0xa4/0xb0 [ 237.641701][ C1] ===================================================== [ 237.648605][ C1] Disabling lock debugging due to kernel taint [ 237.654752][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 237.661402][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Tainted: G B 5.3.0-rc7+ #0 [ 237.670131][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 237.680168][ C1] Call Trace: [ 237.683448][ C1] dump_stack+0x191/0x1f0 [ 237.687772][ C1] panic+0x3c9/0xc1e [ 237.691660][ C1] kmsan_report+0x2a2/0x2b0 [ 237.696142][ C1] __msan_warning+0x73/0xe0 [ 237.700622][ C1] kmem_cache_free+0x3df/0x2b70 [ 237.705446][ C1] ? kmsan_internal_set_origin+0x6a/0xb0 [ 237.711052][ C1] ? kfree_skb+0x473/0x4c0 [ 237.715467][ C1] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 237.721538][ C1] kfree_skb+0x473/0x4c0 [ 237.725771][ C1] ? packet_rcv_spkt+0x719/0x840 [ 237.731161][ C1] packet_rcv_spkt+0x719/0x840 [ 237.735923][ C1] ? packet_rcv+0x2190/0x2190 [ 237.740580][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 237.746311][ C1] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 237.752189][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 237.757907][ C1] napi_gro_receive+0x682/0xb90 [ 237.762750][ C1] receive_buf+0x653b/0x8810 [ 237.767339][ C1] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 237.773231][ C1] virtnet_poll+0x666/0x19d0 [ 237.777812][ C1] ? refill_work+0x460/0x460 [ 237.782398][ C1] net_rx_action+0x74b/0x1950 [ 237.787060][ C1] ? net_tx_action+0xba0/0xba0 [ 237.791801][ C1] __do_softirq+0x4a1/0x83a [ 237.796286][ C1] ? ksoftirqd_should_run+0x30/0x30 [ 237.801456][ C1] ? takeover_tasklets+0x900/0x900 [ 237.806540][ C1] run_ksoftirqd+0x25/0x40 [ 237.810934][ C1] smpboot_thread_fn+0x4a3/0x990 [ 237.815858][ C1] kthread+0x4b5/0x4f0 [ 237.820164][ C1] ? cpu_report_death+0x190/0x190 [ 237.825291][ C1] ? kthread_blkcg+0xf0/0xf0 [ 237.829868][ C1] ret_from_fork+0x35/0x40 [ 237.835802][ C1] Kernel Offset: disabled [ 237.840140][ C1] Rebooting in 86400 seconds..