bpf: Convert queue_stack map to rqspinlock

Replace all usage of raw_spinlock_t in queue_stack_maps.c with
rqspinlock. This is a map type with a set of open syzbot reports
reproducing possible deadlocks. Prior attempt to fix the issues
was at [0], but was dropped in favor of this approach.

Make sure we return the -EBUSY error in case of possible deadlocks or
timeouts, just to make sure user space or BPF programs relying on the
error code to detect problems do not break.

With these changes, the map should be safe to access in any context,
including NMIs.

  [0]: https://lore.kernel.org/all/20240429165658.1305969-1-sidchintamaneni@gmail.com



Reported-by:  <syzbot+8bdfc2c53fb2b63e1871@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/all/0000000000004c3fc90615f37756@google.com


Reported-by:  <syzbot+252bc5c744d0bba917e1@syzkaller.appspotmail.com>
Closes: https://lore.kernel.org/all/000000000000c80abd0616517df9@google.com


Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250410153142.2064340-1-memxor@gmail.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>