slab_pre_alloc_hook mm/slab.h:421 [inline]
 slab_alloc_node mm/slab.c:3297 [inline]
 kmem_cache_alloc_node+0x54/0x410 mm/slab.c:3640
 __alloc_skb+0x5c/0x510 net/core/skbuff.c:193
 alloc_skb include/linux/skbuff.h:980 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:336 [inline]
 ll_recv+0x4fb/0x11d0 drivers/bluetooth/hci_ll.c:516
kasan: GPF could be caused by NULL-ptr deref or user memory access
 hci_uart_tty_receive+0x1ec/0x4c0 drivers/bluetooth/hci_ldisc.c:616
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
 tiocsti drivers/tty/tty_io.c:2186 [inline]
 tty_ioctl+0xe5a/0x13c0 drivers/tty/tty_io.c:2572
CPU: 1 PID: 31695 Comm: kworker/u4:5 Not tainted 4.14.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_unbound flush_to_ldisc
task: ffff888050c1c400 task.stack: ffff888084e60000
RIP: 0010:skb_tail_pointer include/linux/skbuff.h:2017 [inline]
RIP: 0010:skb_put+0x29/0x170 net/core/skbuff.c:1694
RSP: 0018:ffff888084e67b90 EFLAGS: 00010202
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffff888088843cc0
RDX: 000000000000001a RSI: 0000000000000001 RDI: 00000000000000d0
RBP: 0000000000000000 R08: ffffffff8a096bd0 R09: 00000000000508ab
R10: ffff888050c1cd28 R11: ffff888050c1c400 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88808f3bb6a0 R15: ffff888096238180
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
FS:  0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
CR2: 00007f0665a3fd90 CR3: 000000005c2f7000 CR4: 00000000001426e0
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
RIP: 0033:0x45c1f9
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
RSP: 002b:00007f3dea41ac78 EFLAGS: 00000246
Call Trace:
 ORIG_RAX: 0000000000000010
 skb_put_data include/linux/skbuff.h:2097 [inline]
 ll_recv+0x61c/0x11d0 drivers/bluetooth/hci_ll.c:416
RAX: ffffffffffffffda RBX: 0000000000017f00 RCX: 000000000045c1f9
RDX: 0000000020001040 RSI: 0000000000005412 RDI: 0000000000000003
 hci_uart_tty_receive+0x1ec/0x4c0 drivers/bluetooth/hci_ldisc.c:616
RBP: 00007f3dea41aca0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
 tty_ldisc_receive_buf+0x12e/0x170 drivers/tty/tty_buffer.c:459
R13: 00007ffc9d5caf0f R14: 00007f3dea41b9c0 R15: 000000000078bf0c
 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:37
Bluetooth: Unknown HCI packet type 00
 receive_buf drivers/tty/tty_buffer.c:475 [inline]
 flush_to_ldisc+0x1dd/0x3f0 drivers/tty/tty_buffer.c:527
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2116
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2250
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Code: 00 00 41 55 41 54 41 89 f4 55 48 89 fd 53 e8 4f 04 50 fc 48 8d bd d0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 01 00 00 48 8d bd c8 00 00 00 4c 8b ad d0 
RIP: skb_tail_pointer include/linux/skbuff.h:2017 [inline] RSP: ffff888084e67b90
RIP: skb_put+0x29/0x170 net/core/skbuff.c:1694 RSP: ffff888084e67b90
---[ end trace 989a13c6f2999b74 ]---
Bluetooth: Unknown HCI packet type 43