------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 16275 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 16275 Comm: kworker/0:15 Not tainted 5.7.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events do_enable_set
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:221
 __warn+0x209/0x210 kernel/panic.c:582
 report_bug+0x1ac/0x2d0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:175 [inline]
 do_error_trap+0xca/0x1c0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28
Code: c7 2a b4 f2 88 31 c0 e8 43 e4 ac fd 0f 0b eb 85 e8 7a cf da fd c6 05 53 21 cf 05 01 48 c7 c7 56 b4 f2 88 31 c0 e8 25 e4 ac fd <0f> 0b e9 64 ff ff ff e8 59 cf da fd c6 05 33 21 cf 05 01 48 c7 c7
RSP: 0018:ffffc9000405fc48 EFLAGS: 00010246
RAX: 25dbe10b6eae7400 RBX: 0000000000000003 RCX: ffff888050eb61c0
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: ffffffff815cd2b9 R09: ffffed1015d06660
R10: ffffed1015d06660 R11: 0000000000000000 R12: ffffffff895f47a8
R13: dffffc0000000000 R14: ffff8880a325ca18 R15: ffff8880ae83b400
 do_enable_set+0x63a/0x8d0 net/bluetooth/6lowpan.c:1075
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Kernel Offset: disabled
Rebooting in 86400 seconds..