Hello, syzbot found the following issue on: HEAD commit: d6493d2046c4 kmsan: test: pick the first KMSAN report git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=161f4d42b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=3d9607827325e244 dashboard link: https://syzkaller.appspot.com/bug?extid=6f0fd088eee9708bb4e9 compiler: clang version 14.0.0 (git@xxxxxxxxxx:llvm/llvm-project.git 0996585c8e3b3d409494eb5f1cad714b9e1f7fb5), GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12573768b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12756f68b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6f0fd088eee9708bb4e9@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in hci_conn_hash_lookup_handle include/net/bluetooth/hci_core.h:988 [inline] BUG: KMSAN: uninit-value in hci_phy_link_complete_evt+0x1a9/0x8b0 net/bluetooth/hci_event.c:5047 hci_conn_hash_lookup_handle include/net/bluetooth/hci_core.h:988 [inline] hci_phy_link_complete_evt+0x1a9/0x8b0 net/bluetooth/hci_event.c:5047 hci_event_packet+0x893/0x22e0 net/bluetooth/hci_event.c:6458 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: 0 PID: 144 Comm: kworker/u5:0 Tainted: G B 5.15.0-rc2-syzkaller #0 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: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:168 __msan_warning+0xa9/0xf0 mm/kmsan/instrumentation.c:199 hci_conn_hash_lookup_handle include/net/bluetooth/hci_core.h:988 [inline] hci_phy_link_complete_evt+0x1a9/0x8b0 net/bluetooth/hci_event.c:5047 hci_event_packet+0x893/0x22e0 net/bluetooth/hci_event.c:6458 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.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
