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BUG: KMSAN: uninit-value in memcmp lib/string.c:898 [inline]
BUG: KMSAN: uninit-value in bcmp+0x117/0x180 lib/string.c:920
CPU: 0 PID: 12513 Comm: kworker/u5:2 Not tainted 5.2.0-rc4+ #3
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci0 hci_rx_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan.c:611
 __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:304
 memcmp lib/string.c:898 [inline]
 bcmp+0x117/0x180 lib/string.c:920
 bacmp include/net/bluetooth/bluetooth.h:232 [inline]
 hci_inquiry_cache_lookup net/bluetooth/hci_core.c:1093 [inline]
 hci_inquiry_cache_update+0x430/0x19a0 net/bluetooth/hci_core.c:1168
 hci_inquiry_result_with_rssi_evt net/bluetooth/hci_event.c:4007 [inline]
 hci_event_packet+0x8ef4/0x34b60 net/bluetooth/hci_event.c:5875
 hci_rx_work+0x478/0xcc0 net/bluetooth/hci_core.c:4459
 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:201 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:213 [inline]
 kmsan_internal_chain_origin+0xcc/0x150 mm/kmsan/kmsan.c:414
 kmsan_memcpy_memmove_metadata+0x9f9/0xe00 mm/kmsan/kmsan.c:297
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:317
 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:139
 bacpy include/net/bluetooth/bluetooth.h:236 [inline]
 hci_inquiry_result_with_rssi_evt net/bluetooth/hci_event.c:3998 [inline]
 hci_event_packet+0x8d18/0x34b60 net/bluetooth/hci_event.c:5875
 hci_rx_work+0x478/0xcc0 net/bluetooth/hci_core.c:4459
 process_one_work+0x1572/0x1f00 kernel/workqueue.c:2269
 worker_thread+0x111b/0x2460 kernel/workqueue.c:2415
 kthread+0x4b5/0x4f0 kernel/kthread.c:256
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:201 [inline]
 kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:160
 kmsan_kmalloc+0xa4/0x130 mm/kmsan/kmsan_hooks.c:177
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:186
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc_node mm/slub.c:2763 [inline]
 __kmalloc_node_track_caller+0xcba/0xf30 mm/slub.c:4390
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x306/0xa10 net/core/skbuff.c:206
 alloc_skb include/linux/skbuff.h:1055 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline]
 vhci_write+0x15b/0x7e0 drivers/bluetooth/hci_vhci.c:284
 call_write_iter include/linux/fs.h:1872 [inline]
 new_sync_write fs/read_write.c:483 [inline]
 __vfs_write+0xa2c/0xcb0 fs/read_write.c:496
 vfs_write+0x481/0x920 fs/read_write.c:558
 ksys_write+0x265/0x430 fs/read_write.c:611
 __do_sys_write fs/read_write.c:623 [inline]
 __se_sys_write+0x92/0xb0 fs/read_write.c:620
 __x64_sys_write+0x4a/0x70 fs/read_write.c:620
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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