[syzbot] KMSAN: uninit-value in hci_loglink_complete_evt

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 90f502f5d016 kmsan: speculatively unpoison curent_thread_i..
git tree: https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=10a65fcb300000
kernel config: https://syzkaller.appspot.com/x/.config?x=978f1b2d7a5aad3e
dashboard link: https://syzkaller.appspot.com/bug?extid=5da5c010bb611b9399a8
compiler: clang version 14.0.0 (g...@github.com:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5da5c0...@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in hci_conn_hash_lookup_handle include/net/bluetooth/hci_core.h:988 [inline]
BUG: KMSAN: uninit-value in hci_loglink_complete_evt+0x18c/0x580 net/bluetooth/hci_event.c:5088
hci_conn_hash_lookup_handle include/net/bluetooth/hci_core.h:988 [inline]
hci_loglink_complete_evt+0x18c/0x580 net/bluetooth/hci_event.c:5088
hci_event_packet+0x11fc/0x22e0 net/bluetooth/hci_event.c:6462
hci_rx_work+0x6ae/0xd10 net/bluetooth/hci_core.c:5136
process_one_work+0xdc7/0x1760 kernel/workqueue.c:2297
worker_thread+0x1101/0x22b0 kernel/workqueue.c:2444
kthread+0x66b/0x780 kernel/kthread.c:319
ret_from_fork+0x1f/0x30

Uninit was created at:
slab_alloc_node mm/slub.c:3221 [inline]
__kmalloc_node_track_caller+0x8d2/0x1340 mm/slub.c:4955
kmalloc_reserve net/core/skbuff.c:355 [inline]
__alloc_skb+0x4db/0xe40 net/core/skbuff.c:426
alloc_skb include/linux/skbuff.h:1116 [inline]
bt_skb_alloc include/net/bluetooth/bluetooth.h:389 [inline]
vhci_get_user drivers/bluetooth/hci_vhci.c:165 [inline]
vhci_write+0x182/0x8f0 drivers/bluetooth/hci_vhci.c:285
call_write_iter include/linux/fs.h:2163 [inline]
new_sync_write fs/read_write.c:507 [inline]
vfs_write+0x1295/0x1f20 fs/read_write.c:594
ksys_write+0x28c/0x520 fs/read_write.c:647
__do_sys_write fs/read_write.c:659 [inline]
__se_sys_write fs/read_write.c:656 [inline]
__x64_sys_write+0xdb/0x120 fs/read_write.c:656
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x44/0xae
=====================================================
Kernel panic - not syncing: panic_on_kmsan set ...
CPU: 1 PID: 6382 Comm: kworker/u5:2 Tainted: G B 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: hci4 hci_rx_work
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1ff/0x28e lib/dump_stack.c:106
dump_stack+0x25/0x28 lib/dump_stack.c:113
panic+0x44f/0xdeb kernel/panic.c:232
kmsan_report+0x2ee/0x300 mm/kmsan/report.c:186
__msan_warning+0xd7/0x150 mm/kmsan/instrumentation.c:208
hci_conn_hash_lookup_handle include/net/bluetooth/hci_core.h:988 [inline]
hci_loglink_complete_evt+0x18c/0x580 net/bluetooth/hci_event.c:5088
hci_event_packet+0x11fc/0x22e0 net/bluetooth/hci_event.c:6462
hci_rx_work+0x6ae/0xd10 net/bluetooth/hci_core.c:5136
process_one_work+0xdc7/0x1760 kernel/workqueue.c:2297
worker_thread+0x1101/0x22b0 kernel/workqueue.c:2444
kthread+0x66b/0x780 kernel/kthread.c:319
ret_from_fork+0x1f/0x30
Kernel Offset: disabled
Rebooting in 86400 seconds..


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.