[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 100.934091] audit: type=1800 audit(1555292362.993:25): pid=10589 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 100.958772] audit: type=1800 audit(1555292363.013:26): pid=10589 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 100.992432] audit: type=1800 audit(1555292363.043:27): pid=10589 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 '10.128.0.13' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 134.812684] ================================================================== [ 134.820796] BUG: KMSAN: uninit-value in memcmp+0x117/0x180 [ 134.826711] CPU: 0 PID: 10745 Comm: kworker/u5:2 Not tainted 5.1.0-rc4+ #1 [ 134.834780] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 134.845640] Workqueue: hci0 hci_rx_work [ 134.849894] Call Trace: [ 134.852802] dump_stack+0x173/0x1d0 [ 134.856932] kmsan_report+0x131/0x2a0 [ 134.861122] __msan_warning+0x7a/0xf0 [ 134.865405] memcmp+0x117/0x180 [ 134.869790] hci_inquiry_cache_update+0x430/0x19c0 [ 134.876054] ? kmsan_internal_memset_shadow+0x104/0x3a0 [ 134.881788] ? kmsan_memcpy_memmove_metadata+0x989/0xd60 [ 134.887994] hci_event_packet+0x924e/0x35950 [ 134.893149] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 134.900078] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 134.906134] hci_rx_work+0x478/0xcc0 [ 134.910269] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 134.916610] ? hci_alloc_dev+0x2320/0x2320 [ 134.922244] process_one_work+0x1607/0x2010 [ 134.927004] worker_thread+0x111c/0x2460 [ 134.931116] kthread+0x4a1/0x4e0 [ 134.935001] ? process_one_work+0x2010/0x2010 [ 134.940716] ? schedule_tail+0x1b2/0x410 [ 134.945640] ? kthread_blkcg+0xf0/0xf0 [ 134.950107] ret_from_fork+0x35/0x40 [ 134.954158] [ 134.955982] Uninit was stored to memory at: [ 134.961017] kmsan_internal_chain_origin+0x134/0x230 [ 134.966985] kmsan_memcpy_memmove_metadata+0x989/0xd60 [ 134.972907] kmsan_memcpy_metadata+0xb/0x10 [ 134.978177] __msan_memcpy+0x58/0x70 [ 134.981907] hci_event_packet+0x9081/0x35950 [ 134.986757] hci_rx_work+0x478/0xcc0 [ 134.992175] process_one_work+0x1607/0x2010 [ 134.996651] worker_thread+0x111c/0x2460 [ 135.000873] kthread+0x4a1/0x4e0 [ 135.004882] ret_from_fork+0x35/0x40 [ 135.009255] [ 135.010906] Uninit was created at: [ 135.014827] kmsan_internal_poison_shadow+0x92/0x150 [ 135.020838] kmsan_kmalloc+0xa9/0x130 [ 135.025085] kmsan_slab_alloc+0xe/0x10 [ 135.029529] __kmalloc_node_track_caller+0xead/0x1000 [ 135.035634] __alloc_skb+0x309/0xa20 [ 135.039800] vhci_write+0x15b/0x7e0 [ 135.043577] __vfs_write+0x99f/0xc30 [ 135.048189] vfs_write+0x481/0x920 [ 135.052283] ksys_write+0x20c/0x440 [ 135.056238] __se_sys_write+0x92/0xb0 [ 135.060154] __x64_sys_write+0x4a/0x70 [ 135.064246] do_syscall_64+0xbc/0xf0 [ 135.068011] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 135.073302] ================================================================== [ 135.080681] Disabling lock debugging due to kernel taint [ 135.086326] Kernel panic - not syncing: panic_on_warn set ... [ 135.092421] CPU: 0 PID: 10745 Comm: kworker/u5:2 Tainted: G B 5.1.0-rc4+ #1 [ 135.100848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 135.110440] Workqueue: hci0 hci_rx_work [ 135.114616] Call Trace: [ 135.117329] dump_stack+0x173/0x1d0 [ 135.121152] panic+0x3d1/0xb01 [ 135.124512] kmsan_report+0x29a/0x2a0 [ 135.128384] __msan_warning+0x7a/0xf0 [ 135.132318] memcmp+0x117/0x180 [ 135.135909] hci_inquiry_cache_update+0x430/0x19c0 [ 135.141195] ? kmsan_internal_memset_shadow+0x104/0x3a0 [ 135.146840] ? kmsan_memcpy_memmove_metadata+0x989/0xd60 [ 135.152979] hci_event_packet+0x924e/0x35950 [ 135.157919] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 135.163640] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 135.169444] hci_rx_work+0x478/0xcc0 [ 135.173730] ? kmsan_get_shadow_origin_ptr+0x73/0x480 [ 135.179460] ? hci_alloc_dev+0x2320/0x2320 [ 135.184115] process_one_work+0x1607/0x2010 [ 135.188506] worker_thread+0x111c/0x2460 [ 135.192645] kthread+0x4a1/0x4e0 [ 135.196047] ? process_one_work+0x2010/0x2010 [ 135.200572] ? schedule_tail+0x1b2/0x410 [ 135.204695] ? kthread_blkcg+0xf0/0xf0 [ 135.209053] ret_from_fork+0x35/0x40 [ 135.214267] Kernel Offset: disabled [ 135.218196] Rebooting in 86400 seconds..