[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 77.861041][ T31] audit: type=1800 audit(1568086181.906:25): pid=11376 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 77.892619][ T31] audit: type=1800 audit(1568086181.936:26): pid=11376 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 77.912887][ T31] audit: type=1800 audit(1568086181.936:27): pid=11376 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 '10.128.10.23' (ECDSA) to the list of known hosts. 2019/09/10 03:29:56 fuzzer started 2019/09/10 03:30:00 dialing manager at 10.128.0.26:44675 2019/09/10 03:30:01 syscalls: 2376 2019/09/10 03:30:01 code coverage: enabled 2019/09/10 03:30:01 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/09/10 03:30:01 extra coverage: enabled 2019/09/10 03:30:01 setuid sandbox: enabled 2019/09/10 03:30:01 namespace sandbox: enabled 2019/09/10 03:30:01 Android sandbox: /sys/fs/selinux/policy does not exist 2019/09/10 03:30:01 fault injection: enabled 2019/09/10 03:30:01 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/09/10 03:30:01 net packet injection: enabled 2019/09/10 03:30:01 net device setup: enabled syzkaller login: [ 215.495237][ C0] ================================================================== [ 215.503391][ C0] BUG: KMSAN: uninit-value in kmem_cache_free+0x3df/0x2b70 [ 215.510605][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc7+ #0 [ 215.517894][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 215.527969][ C0] Call Trace: [ 215.531285][ C0] dump_stack+0x191/0x1f0 [ 215.535670][ C0] kmsan_report+0x162/0x2d0 [ 215.540196][ C0] __msan_warning+0x75/0xe0 [ 215.544730][ C0] kmem_cache_free+0x3df/0x2b70 [ 215.549598][ C0] ? kfree_skb+0x473/0x4c0 [ 215.554037][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 215.560138][ C0] kfree_skb+0x473/0x4c0 [ 215.564400][ C0] ? packet_rcv_spkt+0x719/0x840 [ 215.569359][ C0] packet_rcv_spkt+0x719/0x840 [ 215.574161][ C0] ? packet_rcv+0x2190/0x2190 [ 215.578868][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 215.584638][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 215.590643][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 215.596399][ C0] napi_gro_receive+0x682/0xb90 [ 215.601287][ C0] receive_buf+0x653b/0x8810 [ 215.606100][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 215.612105][ C0] virtnet_poll+0x666/0x19d0 [ 215.616738][ C0] ? refill_work+0x460/0x460 [ 215.621352][ C0] net_rx_action+0x74b/0x1950 [ 215.626070][ C0] ? net_tx_action+0xba0/0xba0 [ 215.630857][ C0] __do_softirq+0x4a1/0x83a [ 215.635386][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 215.640608][ C0] ? takeover_tasklets+0x900/0x900 [ 215.645756][ C0] run_ksoftirqd+0x25/0x40 [ 215.650192][ C0] smpboot_thread_fn+0x4a3/0x990 [ 215.655158][ C0] kthread+0x4b5/0x4f0 [ 215.659242][ C0] ? cpu_report_death+0x190/0x190 [ 215.664284][ C0] ? kthread_blkcg+0xf0/0xf0 [ 215.668895][ C0] ret_from_fork+0x35/0x40 [ 215.673321][ C0] [ 215.675651][ C0] Uninit was stored to memory at: [ 215.680687][ C0] kmsan_internal_chain_origin+0xcc/0x150 [ 215.686422][ C0] __msan_chain_origin+0x6b/0xe0 [ 215.691373][ C0] ___slab_alloc+0x1dbc/0x1fb0 [ 215.696149][ C0] kmem_cache_alloc+0xade/0xd10 [ 215.701010][ C0] skb_clone+0x326/0x5d0 [ 215.705349][ C0] packet_rcv_spkt+0x245/0x840 [ 215.710128][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 215.715863][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 215.721594][ C0] napi_gro_receive+0x682/0xb90 [ 215.726465][ C0] receive_buf+0x653b/0x8810 [ 215.731069][ C0] virtnet_poll+0x666/0x19d0 [ 215.735677][ C0] net_rx_action+0x74b/0x1950 [ 215.740365][ C0] __do_softirq+0x4a1/0x83a [ 215.744886][ C0] run_ksoftirqd+0x25/0x40 [ 215.749354][ C0] smpboot_thread_fn+0x4a3/0x990 [ 215.754303][ C0] kthread+0x4b5/0x4f0 [ 215.758385][ C0] ret_from_fork+0x35/0x40 [ 215.762795][ C0] [ 215.765119][ C0] Uninit was created at: [ 215.769371][ C0] kmsan_internal_poison_shadow+0x58/0xb0 [ 215.775094][ C0] kmsan_slab_free+0x8d/0x100 [ 215.779775][ C0] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 215.785142][ C0] napi_consume_skb+0x593/0x5d0 [ 215.790004][ C0] free_old_xmit_skbs+0x1a1/0x450 [ 215.795033][ C0] virtnet_poll_tx+0x24c/0x4c0 [ 215.799806][ C0] net_rx_action+0x74b/0x1950 [ 215.804467][ C0] __do_softirq+0x4a1/0x83a [ 215.808950][ C0] irq_exit+0x230/0x280 [ 215.813129][ C0] do_IRQ+0x20d/0x3a0 [ 215.817088][ C0] ret_from_intr+0x0/0x33 [ 215.821392][ C0] default_idle+0x53/0x90 [ 215.825699][ C0] arch_cpu_idle+0x25/0x30 [ 215.830089][ C0] do_idle+0x1d7/0x790 [ 215.834133][ C0] cpu_startup_entry+0x45/0x50 [ 215.838887][ C0] start_secondary+0x370/0x470 [ 215.843647][ C0] secondary_startup_64+0xa4/0xb0 [ 215.848642][ C0] ================================================================== [ 215.856688][ C0] Disabling lock debugging due to kernel taint [ 215.862826][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 215.869401][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G B 5.3.0-rc7+ #0 [ 215.878047][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 215.888084][ C0] Call Trace: [ 215.891363][ C0] dump_stack+0x191/0x1f0 [ 215.895678][ C0] panic+0x3c9/0xc1e [ 215.899564][ C0] kmsan_report+0x2ca/0x2d0 [ 215.904067][ C0] __msan_warning+0x75/0xe0 [ 215.909103][ C0] kmem_cache_free+0x3df/0x2b70 [ 215.913933][ C0] ? kfree_skb+0x473/0x4c0 [ 215.918337][ C0] ? kmsan_internal_unpoison_shadow+0x2f/0x40 [ 215.924394][ C0] kfree_skb+0x473/0x4c0 [ 215.928617][ C0] ? packet_rcv_spkt+0x719/0x840 [ 215.933534][ C0] packet_rcv_spkt+0x719/0x840 [ 215.938296][ C0] ? packet_rcv+0x2190/0x2190 [ 215.942978][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 215.948704][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 215.954683][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 215.960411][ C0] napi_gro_receive+0x682/0xb90 [ 215.965261][ C0] receive_buf+0x653b/0x8810 [ 215.969861][ C0] ? kmsan_get_shadow_origin_ptr+0x28c/0x3a0 [ 215.975846][ C0] virtnet_poll+0x666/0x19d0 [ 215.980431][ C0] ? refill_work+0x460/0x460 [ 215.985004][ C0] net_rx_action+0x74b/0x1950 [ 215.989671][ C0] ? net_tx_action+0xba0/0xba0 [ 215.994431][ C0] __do_softirq+0x4a1/0x83a [ 215.998919][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 216.004096][ C0] ? takeover_tasklets+0x900/0x900 [ 216.009202][ C0] run_ksoftirqd+0x25/0x40 [ 216.013600][ C0] smpboot_thread_fn+0x4a3/0x990 [ 216.018545][ C0] kthread+0x4b5/0x4f0 [ 216.022604][ C0] ? cpu_report_death+0x190/0x190 [ 216.027627][ C0] ? kthread_blkcg+0xf0/0xf0 [ 216.032199][ C0] ret_from_fork+0x35/0x40 [ 216.038326][ C0] Kernel Offset: disabled [ 216.042670][ C0] Rebooting in 86400 seconds..