[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 73.706749][ T30] audit: type=1800 audit(1568713132.756:25): pid=11128 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 73.729944][ T30] audit: type=1800 audit(1568713132.776:26): pid=11128 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 73.773447][ T30] audit: type=1800 audit(1568713132.806:27): pid=11128 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 '10.128.0.17' (ECDSA) to the list of known hosts. 2019/09/17 09:39:06 fuzzer started 2019/09/17 09:39:10 dialing manager at 10.128.0.26:41757 2019/09/17 09:39:10 syscalls: 2376 2019/09/17 09:39:10 code coverage: enabled 2019/09/17 09:39:10 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/17 09:39:10 extra coverage: enabled 2019/09/17 09:39:10 setuid sandbox: enabled 2019/09/17 09:39:10 namespace sandbox: enabled 2019/09/17 09:39:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/17 09:39:10 fault injection: enabled 2019/09/17 09:39:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/17 09:39:10 net packet injection: enabled 2019/09/17 09:39:10 net device setup: enabled syzkaller login: [ 199.692865][ C1] ================================================================== [ 199.701000][ C1] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 199.708351][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0-rc7+ #0 [ 199.715697][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 199.725846][ C1] Call Trace: [ 199.729187][ C1] dump_stack+0x191/0x1f0 [ 199.733620][ C1] kmsan_report+0x162/0x2d0 [ 199.738228][ C1] __msan_warning+0x75/0xe0 [ 199.742727][ C1] kmem_cache_free+0x3df/0x2b70 [ 199.747658][ C1] ? kmsan_set_origin+0x6a/0xf0 [ 199.752487][ C1] ? kfree_skb+0x473/0x4c0 [ 199.756900][ C1] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 199.762972][ C1] kfree_skb+0x473/0x4c0 [ 199.767346][ C1] ? packet_rcv_spkt+0x719/0x840 [ 199.772486][ C1] packet_rcv_spkt+0x719/0x840 [ 199.777313][ C1] ? packet_rcv+0x2190/0x2190 [ 199.781991][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 199.787850][ C1] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 199.793970][ C1] ? netif_receive_skb_internal+0x383/0xc20 [ 199.799887][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 199.805722][ C1] napi_gro_receive+0x682/0xb90 [ 199.810567][ C1] receive_buf+0x653b/0x8810 [ 199.815169][ C1] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 199.821058][ C1] virtnet_poll+0x666/0x19d0 [ 199.825653][ C1] ? refill_work+0x460/0x460 [ 199.830409][ C1] net_rx_action+0x74b/0x1950 [ 199.835073][ C1] ? net_tx_action+0xba0/0xba0 [ 199.839909][ C1] __do_softirq+0x4a1/0x83a [ 199.844510][ C1] ? ksoftirqd_should_run+0x30/0x30 [ 199.849698][ C1] ? takeover_tasklets+0x900/0x900 [ 199.854787][ C1] run_ksoftirqd+0x25/0x40 [ 199.859183][ C1] smpboot_thread_fn+0x4a3/0x990 [ 199.864113][ C1] kthread+0x4b5/0x4f0 [ 199.868159][ C1] ? cpu_report_death+0x190/0x190 [ 199.873172][ C1] ? kthread_blkcg+0xf0/0xf0 [ 199.877931][ C1] ret_from_fork+0x35/0x40 [ 199.882363][ C1] [ 199.884682][ C1] Uninit was stored to memory at: [ 199.889699][ C1] kmsan_internal_chain_origin+0xcc/0x150 [ 199.895843][ C1] __msan_chain_origin+0x6b/0xe0 [ 199.900763][ C1] ___slab_alloc+0x1dbc/0x1fb0 [ 199.905605][ C1] kmem_cache_alloc+0xade/0xd10 [ 199.910445][ C1] skb_clone+0x326/0x5d0 [ 199.914776][ C1] packet_rcv_spkt+0x245/0x840 [ 199.919536][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 199.925253][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 199.931135][ C1] napi_gro_receive+0x682/0xb90 [ 199.935964][ C1] receive_buf+0x653b/0x8810 [ 199.940529][ C1] virtnet_poll+0x666/0x19d0 [ 199.945100][ C1] net_rx_action+0x74b/0x1950 [ 199.950046][ C1] __do_softirq+0x4a1/0x83a [ 199.954631][ C1] run_ksoftirqd+0x25/0x40 [ 199.959031][ C1] smpboot_thread_fn+0x4a3/0x990 [ 199.963959][ C1] kthread+0x4b5/0x4f0 [ 199.968021][ C1] ret_from_fork+0x35/0x40 [ 199.972414][ C1] [ 199.974720][ C1] Uninit was created at: [ 199.978949][ C1] kmsan_internal_poison_shadow+0x58/0xb0 [ 199.984653][ C1] kmsan_slab_free+0x8d/0x100 [ 199.989369][ C1] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 199.994730][ C1] napi_consume_skb+0x593/0x5d0 [ 199.999830][ C1] free_old_xmit_skbs+0x1a1/0x450 [ 200.004844][ C1] virtnet_poll_tx+0x24c/0x4c0 [ 200.009690][ C1] net_rx_action+0x74b/0x1950 [ 200.014454][ C1] __do_softirq+0x4a1/0x83a [ 200.018956][ C1] irq_exit+0x230/0x280 [ 200.023199][ C1] do_IRQ+0x20d/0x3a0 [ 200.027173][ C1] ret_from_intr+0x0/0x33 [ 200.031507][ C1] default_idle+0x53/0x90 [ 200.035917][ C1] arch_cpu_idle+0x25/0x30 [ 200.040329][ C1] do_idle+0x1d7/0x790 [ 200.044373][ C1] cpu_startup_entry+0x45/0x50 [ 200.049119][ C1] rest_init+0x1be/0x1f0 [ 200.053442][ C1] arch_call_rest_init+0x13/0x15 [ 200.058366][ C1] start_kernel+0x991/0xb61 [ 200.062859][ C1] x86_64_start_reservations+0x18/0x2e [ 200.068303][ C1] x86_64_start_kernel+0x81/0x84 [ 200.073217][ C1] secondary_startup_64+0xa4/0xb0 [ 200.078281][ C1] ================================================================== [ 200.086334][ C1] Disabling lock debugging due to kernel taint [ 200.092471][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 200.099045][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Tainted: G B 5.3.0-rc7+ #0 [ 200.107829][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 200.117951][ C1] Call Trace: [ 200.121228][ C1] dump_stack+0x191/0x1f0 [ 200.125564][ C1] panic+0x3c9/0xc1e [ 200.129469][ C1] kmsan_report+0x2ca/0x2d0 [ 200.133955][ C1] __msan_warning+0x75/0xe0 [ 200.138483][ C1] kmem_cache_free+0x3df/0x2b70 [ 200.143323][ C1] ? kmsan_set_origin+0x6a/0xf0 [ 200.148173][ C1] ? kfree_skb+0x473/0x4c0 [ 200.152589][ C1] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 200.158670][ C1] kfree_skb+0x473/0x4c0 [ 200.162898][ C1] ? packet_rcv_spkt+0x719/0x840 [ 200.167835][ C1] packet_rcv_spkt+0x719/0x840 [ 200.172583][ C1] ? packet_rcv+0x2190/0x2190 [ 200.177260][ C1] __netif_receive_skb_core+0x3aed/0x51a0 [ 200.182982][ C1] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 200.188885][ C1] ? netif_receive_skb_internal+0x383/0xc20 [ 200.194774][ C1] netif_receive_skb_internal+0x3cc/0xc20 [ 200.200487][ C1] napi_gro_receive+0x682/0xb90 [ 200.205340][ C1] receive_buf+0x653b/0x8810 [ 200.209935][ C1] ? kmsan_get_shadow_origin_ptr+0x71/0x4c0 [ 200.215816][ C1] virtnet_poll+0x666/0x19d0 [ 200.220414][ C1] ? refill_work+0x460/0x460 [ 200.225001][ C1] net_rx_action+0x74b/0x1950 [ 200.229683][ C1] ? net_tx_action+0xba0/0xba0 [ 200.234509][ C1] __do_softirq+0x4a1/0x83a [ 200.239008][ C1] ? ksoftirqd_should_run+0x30/0x30 [ 200.244181][ C1] ? takeover_tasklets+0x900/0x900 [ 200.249279][ C1] run_ksoftirqd+0x25/0x40 [ 200.253687][ C1] smpboot_thread_fn+0x4a3/0x990 [ 200.259152][ C1] kthread+0x4b5/0x4f0 [ 200.263304][ C1] ? cpu_report_death+0x190/0x190 [ 200.268311][ C1] ? kthread_blkcg+0xf0/0xf0 [ 200.272994][ C1] ret_from_fork+0x35/0x40 [ 200.279079][ C1] Kernel Offset: disabled [ 200.283528][ C1] Rebooting in 86400 seconds..