[ OK ] Started OpenBSD Secure Shell server. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.205' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 88.133039][ T8805] ===================================================== [ 88.140037][ T8805] BUG: KMSAN: uninit-value in bcmp+0x136/0x190 [ 88.146193][ T8805] CPU: 0 PID: 8805 Comm: kworker/u5:2 Not tainted 5.7.0-rc4-syzkaller #0 [ 88.154597][ T8805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.164658][ T8805] Workqueue: hci0 hci_rx_work [ 88.169331][ T8805] Call Trace: [ 88.172631][ T8805] dump_stack+0x1c9/0x220 [ 88.176972][ T8805] kmsan_report+0xf7/0x1e0 [ 88.181389][ T8805] __msan_warning+0x58/0xa0 [ 88.185880][ T8805] bcmp+0x136/0x190 [ 88.189701][ T8805] hci_inquiry_cache_update+0x4d8/0x19c0 [ 88.195330][ T8805] ? kmsan_get_metadata+0x11d/0x180 [ 88.200528][ T8805] ? kmsan_memcpy_memmove_metadata+0x272/0x2e0 [ 88.206669][ T8805] ? kmsan_get_metadata+0x4f/0x180 [ 88.211774][ T8805] hci_event_packet+0x8e26/0x359e0 [ 88.216870][ T8805] ? kmsan_get_metadata+0x4f/0x180 [ 88.221984][ T8805] ? hci_send_to_monitor+0x138/0x520 [ 88.227254][ T8805] ? kmsan_get_metadata+0x11d/0x180 [ 88.232440][ T8805] hci_rx_work+0xa8f/0xd20 [ 88.236847][ T8805] ? hci_alloc_dev+0x2680/0x2680 [ 88.241771][ T8805] process_one_work+0x1555/0x1f40 [ 88.246793][ T8805] worker_thread+0xef6/0x2450 [ 88.251456][ T8805] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 88.257244][ T8805] ? kmsan_get_metadata+0x11d/0x180 [ 88.262434][ T8805] kthread+0x4b5/0x4f0 [ 88.266484][ T8805] ? process_one_work+0x1f40/0x1f40 [ 88.271669][ T8805] ? kthread_blkcg+0xf0/0xf0 [ 88.276251][ T8805] ret_from_fork+0x35/0x40 [ 88.280651][ T8805] [ 88.282962][ T8805] Uninit was stored to memory at: [ 88.287971][ T8805] kmsan_internal_chain_origin+0xad/0x130 [ 88.293672][ T8805] kmsan_memcpy_memmove_metadata+0x272/0x2e0 [ 88.299634][ T8805] kmsan_memcpy_metadata+0xb/0x10 [ 88.304648][ T8805] __msan_memcpy+0x43/0x50 [ 88.309046][ T8805] hci_event_packet+0x8c41/0x359e0 [ 88.314136][ T8805] hci_rx_work+0xa8f/0xd20 [ 88.318533][ T8805] process_one_work+0x1555/0x1f40 [ 88.323536][ T8805] worker_thread+0xef6/0x2450 [ 88.328192][ T8805] kthread+0x4b5/0x4f0 [ 88.332251][ T8805] ret_from_fork+0x35/0x40 [ 88.336647][ T8805] [ 88.338953][ T8805] Uninit was created at: [ 88.343186][ T8805] kmsan_internal_poison_shadow+0x66/0xd0 [ 88.348885][ T8805] kmsan_slab_alloc+0x8a/0xe0 [ 88.353543][ T8805] __kmalloc_node_track_caller+0xb40/0x1200 [ 88.359416][ T8805] __alloc_skb+0x2fd/0xac0 [ 88.363812][ T8805] vhci_write+0x15b/0x800 [ 88.368136][ T8805] __vfs_write+0xa5a/0xca0 [ 88.372535][ T8805] vfs_write+0x444/0x8e0 [ 88.376757][ T8805] ksys_write+0x267/0x450 [ 88.381064][ T8805] __se_sys_write+0x92/0xb0 [ 88.385546][ T8805] __x64_sys_write+0x4a/0x70 [ 88.390116][ T8805] do_syscall_64+0xb8/0x160 [ 88.394602][ T8805] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 88.400470][ T8805] ===================================================== [ 88.407378][ T8805] Disabling lock debugging due to kernel taint [ 88.413505][ T8805] Kernel panic - not syncing: panic_on_warn set ... [ 88.420074][ T8805] CPU: 0 PID: 8805 Comm: kworker/u5:2 Tainted: G B 5.7.0-rc4-syzkaller #0 [ 88.429848][ T8805] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.439892][ T8805] Workqueue: hci0 hci_rx_work [ 88.444546][ T8805] Call Trace: [ 88.447821][ T8805] dump_stack+0x1c9/0x220 [ 88.452141][ T8805] panic+0x3d5/0xc3e [ 88.456034][ T8805] kmsan_report+0x1df/0x1e0 [ 88.460527][ T8805] __msan_warning+0x58/0xa0 [ 88.465016][ T8805] bcmp+0x136/0x190 [ 88.468812][ T8805] hci_inquiry_cache_update+0x4d8/0x19c0 [ 88.474424][ T8805] ? kmsan_get_metadata+0x11d/0x180 [ 88.479630][ T8805] ? kmsan_memcpy_memmove_metadata+0x272/0x2e0 [ 88.485771][ T8805] ? kmsan_get_metadata+0x4f/0x180 [ 88.490873][ T8805] hci_event_packet+0x8e26/0x359e0 [ 88.495971][ T8805] ? kmsan_get_metadata+0x4f/0x180 [ 88.501088][ T8805] ? hci_send_to_monitor+0x138/0x520 [ 88.506359][ T8805] ? kmsan_get_metadata+0x11d/0x180 [ 88.511548][ T8805] hci_rx_work+0xa8f/0xd20 [ 88.515961][ T8805] ? hci_alloc_dev+0x2680/0x2680 [ 88.520882][ T8805] process_one_work+0x1555/0x1f40 [ 88.525903][ T8805] worker_thread+0xef6/0x2450 [ 88.530568][ T8805] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 88.536355][ T8805] ? kmsan_get_metadata+0x11d/0x180 [ 88.541558][ T8805] kthread+0x4b5/0x4f0 [ 88.545609][ T8805] ? process_one_work+0x1f40/0x1f40 [ 88.550797][ T8805] ? kthread_blkcg+0xf0/0xf0 [ 88.555378][ T8805] ret_from_fork+0x35/0x40 [ 88.560927][ T8805] Kernel Offset: 0x1e000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 88.572535][ T8805] Rebooting in 86400 seconds..