[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 82.713197][ T32] audit: type=1800 audit(1570116606.760:25): pid=11814 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 82.736534][ T32] audit: type=1800 audit(1570116606.780:26): pid=11814 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 82.773496][ T32] audit: type=1800 audit(1570116606.800:27): pid=11814 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 '10.128.0.150' (ECDSA) to the list of known hosts. 2019/10/03 15:30:19 fuzzer started 2019/10/03 15:30:23 dialing manager at 10.128.0.26:46029 2019/10/03 15:30:24 syscalls: 2412 2019/10/03 15:30:24 code coverage: enabled 2019/10/03 15:30:24 comparison tracing: CONFIG_KCOV_ENABLE_COMPARISONS is not enabled 2019/10/03 15:30:24 extra coverage: enabled 2019/10/03 15:30:24 setuid sandbox: enabled 2019/10/03 15:30:24 namespace sandbox: enabled 2019/10/03 15:30:24 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/03 15:30:24 fault injection: enabled 2019/10/03 15:30:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/03 15:30:24 net packet injection: enabled 2019/10/03 15:30:24 net device setup: enabled syzkaller login: [ 268.412660][ C0] ===================================================== [ 268.419880][ C0] BUG: KMSAN: uninit-value in kfree_skb+0x473/0x4c0 [ 268.426610][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0-rc7+ #0 [ 268.433920][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 268.444157][ C0] Call Trace: [ 268.447549][ C0] dump_stack+0x191/0x1f0 [ 268.451938][ C0] kmsan_report+0x13a/0x2b0 [ 268.456435][ C0] __msan_warning+0x73/0xe0 [ 268.460967][ C0] kmem_cache_free+0x3df/0x2b70 [ 268.465841][ C0] ? kmsan_internal_set_origin+0x6a/0xb0 [ 268.471506][ C0] ? kfree_skb+0x473/0x4c0 [ 268.476097][ C0] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 268.482198][ C0] kfree_skb+0x473/0x4c0 [ 268.486756][ C0] ? packet_rcv_spkt+0x719/0x840 [ 268.491746][ C0] packet_rcv_spkt+0x719/0x840 [ 268.496543][ C0] ? packet_rcv+0x2190/0x2190 [ 268.501301][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 268.507049][ C0] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 268.513053][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 268.518934][ C0] napi_gro_receive+0x682/0xb90 [ 268.523988][ C0] receive_buf+0x653b/0x8810 [ 268.528580][ C0] ? ksm_scan_thread+0x2246/0xcc10 [ 268.533708][ C0] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 268.539603][ C0] virtnet_poll+0x666/0x19d0 [ 268.544292][ C0] ? refill_work+0x460/0x460 [ 268.548907][ C0] net_rx_action+0x74b/0x1950 [ 268.553662][ C0] ? net_tx_action+0xba0/0xba0 [ 268.558491][ C0] __do_softirq+0x4a1/0x83a [ 268.563673][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 268.568987][ C0] ? takeover_tasklets+0x900/0x900 [ 268.574086][ C0] run_ksoftirqd+0x25/0x40 [ 268.578563][ C0] smpboot_thread_fn+0x4a3/0x990 [ 268.583505][ C0] kthread+0x4b5/0x4f0 [ 268.587556][ C0] ? cpu_report_death+0x190/0x190 [ 268.592566][ C0] ? kthread_blkcg+0xf0/0xf0 [ 268.597185][ C0] ret_from_fork+0x35/0x40 [ 268.601674][ C0] [ 268.603984][ C0] Uninit was stored to memory at: [ 268.609138][ C0] kmsan_internal_chain_origin+0xd2/0x170 [ 268.614870][ C0] __msan_chain_origin+0x6b/0xe0 [ 268.619815][ C0] ___slab_alloc+0x1dbc/0x1fb0 [ 268.624562][ C0] kmem_cache_alloc+0xade/0xd10 [ 268.629403][ C0] skb_clone+0x326/0x5d0 [ 268.633642][ C0] packet_rcv_spkt+0x245/0x840 [ 268.638392][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 268.644112][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 268.649973][ C0] napi_gro_receive+0x682/0xb90 [ 268.654831][ C0] receive_buf+0x653b/0x8810 [ 268.659416][ C0] virtnet_poll+0x666/0x19d0 [ 268.664037][ C0] net_rx_action+0x74b/0x1950 [ 268.668734][ C0] __do_softirq+0x4a1/0x83a [ 268.673233][ C0] run_ksoftirqd+0x25/0x40 [ 268.677635][ C0] smpboot_thread_fn+0x4a3/0x990 [ 268.682553][ C0] kthread+0x4b5/0x4f0 [ 268.686604][ C0] ret_from_fork+0x35/0x40 [ 268.691032][ C0] [ 268.693348][ C0] Uninit was created at: [ 268.697580][ C0] kmsan_internal_poison_shadow+0x53/0x100 [ 268.703383][ C0] kmsan_slab_free+0x8d/0x100 [ 268.708079][ C0] kmem_cache_free_bulk+0x3ad9/0x3f50 [ 268.713448][ C0] __kfree_skb_flush+0xb0/0x100 [ 268.718280][ C0] net_rx_action+0x1908/0x1950 [ 268.723027][ C0] __do_softirq+0x4a1/0x83a [ 268.727523][ C0] irq_exit+0x230/0x280 [ 268.731793][ C0] do_IRQ+0x20d/0x3a0 [ 268.735774][ C0] ret_from_intr+0x0/0x33 [ 268.740093][ C0] default_idle+0x53/0x90 [ 268.744440][ C0] arch_cpu_idle+0x25/0x30 [ 268.748882][ C0] do_idle+0x1d7/0x790 [ 268.752938][ C0] cpu_startup_entry+0x45/0x50 [ 268.757697][ C0] start_secondary+0x370/0x470 [ 268.762486][ C0] secondary_startup_64+0xa4/0xb0 [ 268.767494][ C0] ===================================================== [ 268.774419][ C0] Disabling lock debugging due to kernel taint [ 268.780557][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 268.787139][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Tainted: G B 5.3.0-rc7+ #0 [ 268.795792][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 268.805823][ C0] Call Trace: [ 268.809102][ C0] dump_stack+0x191/0x1f0 [ 268.813458][ C0] panic+0x3c9/0xc1e [ 268.817367][ C0] kmsan_report+0x2a2/0x2b0 [ 268.821885][ C0] __msan_warning+0x73/0xe0 [ 268.826384][ C0] kmem_cache_free+0x3df/0x2b70 [ 268.831216][ C0] ? kmsan_internal_set_origin+0x6a/0xb0 [ 268.836875][ C0] ? kfree_skb+0x473/0x4c0 [ 268.841360][ C0] ? kmsan_internal_unpoison_shadow+0x42/0x80 [ 268.847570][ C0] kfree_skb+0x473/0x4c0 [ 268.851810][ C0] ? packet_rcv_spkt+0x719/0x840 [ 268.856741][ C0] packet_rcv_spkt+0x719/0x840 [ 268.861494][ C0] ? packet_rcv+0x2190/0x2190 [ 268.866157][ C0] __netif_receive_skb_core+0x3aed/0x51a0 [ 268.871890][ C0] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 268.877797][ C0] netif_receive_skb_internal+0x3cc/0xc20 [ 268.884470][ C0] napi_gro_receive+0x682/0xb90 [ 268.889322][ C0] receive_buf+0x653b/0x8810 [ 268.893912][ C0] ? ksm_scan_thread+0x2246/0xcc10 [ 268.899030][ C0] ? kmsan_get_shadow_origin_ptr+0x6e/0x4c0 [ 268.904906][ C0] virtnet_poll+0x666/0x19d0 [ 268.909489][ C0] ? refill_work+0x460/0x460 [ 268.914057][ C0] net_rx_action+0x74b/0x1950 [ 268.919371][ C0] ? net_tx_action+0xba0/0xba0 [ 268.924114][ C0] __do_softirq+0x4a1/0x83a [ 268.928601][ C0] ? ksoftirqd_should_run+0x30/0x30 [ 268.933779][ C0] ? takeover_tasklets+0x900/0x900 [ 268.938897][ C0] run_ksoftirqd+0x25/0x40 [ 268.943328][ C0] smpboot_thread_fn+0x4a3/0x990 [ 268.948273][ C0] kthread+0x4b5/0x4f0 [ 268.952684][ C0] ? cpu_report_death+0x190/0x190 [ 268.957713][ C0] ? kthread_blkcg+0xf0/0xf0 [ 268.962307][ C0] ret_from_fork+0x35/0x40 [ 268.967985][ C0] Kernel Offset: disabled [ 268.972311][ C0] Rebooting in 86400 seconds..