[ OK ] Found device /dev/ttyS0. [ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started System Logging Service. Debian GNU/Linux 9 syzkaller ttyS0 syzkaller login: [ 134.392726][ T8366] sshd (8366) used greatest stack depth: 4048 bytes left Warning: Permanently added '10.128.1.14' (ECDSA) to the list of known hosts. [ 147.259913][ T8490] IPVS: ftp: loaded support on port[0] = 21 executing program [ 147.383951][ T8496] ===================================================== [ 147.391056][ T8496] BUG: KMSAN: uninit-value in hci_chan_lookup_handle+0x1e3/0x310 [ 147.398999][ T8496] CPU: 0 PID: 8496 Comm: kworker/u5:2 Not tainted 5.8.0-rc5-syzkaller #0 [ 147.407448][ T8496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 147.418608][ T8496] Workqueue: hci0 hci_rx_work [ 147.423298][ T8496] Call Trace: [ 147.426617][ T8496] dump_stack+0x21c/0x280 [ 147.430985][ T8496] kmsan_report+0xf7/0x1e0 [ 147.435517][ T8496] __msan_warning+0x58/0xa0 [ 147.440054][ T8496] hci_chan_lookup_handle+0x1e3/0x310 [ 147.445475][ T8496] hci_event_packet+0x14e10/0x39d30 [ 147.450789][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.456129][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.461365][ T8496] ? kmsan_set_origin_checked+0x95/0xf0 [ 147.467906][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.473256][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.478557][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.483794][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.492795][ T8496] hci_rx_work+0x6df/0xd30 [ 147.497257][ T8496] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 147.503135][ T8496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 147.509268][ T8496] ? hci_alloc_dev+0x2680/0x2680 [ 147.514237][ T8496] process_one_work+0x1688/0x2140 [ 147.519763][ T8496] worker_thread+0x10bc/0x2730 [ 147.524560][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.529794][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.535154][ T8496] kthread+0x551/0x590 [ 147.539267][ T8496] ? process_one_work+0x2140/0x2140 [ 147.544482][ T8496] ? kthread_blkcg+0x110/0x110 [ 147.549248][ T8496] ret_from_fork+0x1f/0x30 [ 147.553658][ T8496] [ 147.556003][ T8496] Uninit was created at: [ 147.560336][ T8496] kmsan_internal_poison_shadow+0x66/0xd0 [ 147.566563][ T8496] kmsan_slab_alloc+0x8a/0xe0 [ 147.571344][ T8496] __kmalloc_node_track_caller+0xeab/0x12e0 [ 147.577242][ T8496] __alloc_skb+0x35f/0xb30 [ 147.581666][ T8496] vhci_write+0x18a/0x890 [ 147.586018][ T8496] vfs_write+0xf9a/0x17c0 [ 147.590546][ T8496] ksys_write+0x275/0x500 [ 147.594865][ T8496] __se_sys_write+0x92/0xb0 [ 147.599354][ T8496] __x64_sys_write+0x4a/0x70 [ 147.603944][ T8496] do_syscall_64+0xad/0x160 [ 147.610250][ T8496] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 147.616389][ T8496] ===================================================== [ 147.623429][ T8496] Disabling lock debugging due to kernel taint [ 147.629611][ T8496] Kernel panic - not syncing: panic_on_warn set ... [ 147.636360][ T8496] CPU: 0 PID: 8496 Comm: kworker/u5:2 Tainted: G B 5.8.0-rc5-syzkaller #0 [ 147.646866][ T8496] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 147.657182][ T8496] Workqueue: hci0 hci_rx_work [ 147.661870][ T8496] Call Trace: [ 147.665167][ T8496] dump_stack+0x21c/0x280 [ 147.669498][ T8496] panic+0x4d7/0xef7 [ 147.673415][ T8496] ? add_taint+0x17c/0x210 [ 147.677843][ T8496] kmsan_report+0x1df/0x1e0 [ 147.682355][ T8496] __msan_warning+0x58/0xa0 [ 147.686860][ T8496] hci_chan_lookup_handle+0x1e3/0x310 [ 147.692267][ T8496] hci_event_packet+0x14e10/0x39d30 [ 147.697582][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.702782][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.707989][ T8496] ? kmsan_set_origin_checked+0x95/0xf0 [ 147.713545][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.718744][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.723958][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.729282][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.735086][ T8496] hci_rx_work+0x6df/0xd30 [ 147.739545][ T8496] ? kmsan_get_shadow_origin_ptr+0x81/0xb0 [ 147.745367][ T8496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 147.751460][ T8496] ? hci_alloc_dev+0x2680/0x2680 [ 147.756473][ T8496] process_one_work+0x1688/0x2140 [ 147.762518][ T8496] worker_thread+0x10bc/0x2730 [ 147.767296][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.773110][ T8496] ? kmsan_get_metadata+0x116/0x180 [ 147.778329][ T8496] kthread+0x551/0x590 [ 147.782931][ T8496] ? process_one_work+0x2140/0x2140 [ 147.788124][ T8496] ? kthread_blkcg+0x110/0x110 [ 147.792885][ T8496] ret_from_fork+0x1f/0x30 [ 147.798932][ T8496] Kernel Offset: disabled [ 147.803304][ T8496] Rebooting in 86400 seconds..