[Bug gdb/31281] [gdb] intrusive_list.h:329: internal-error: push_back: Assertion elem_node->prev == INTRUSIVE_LIST_UNLINKED_VALUE failed.

["simark at simark dot ca" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31281

--- Comment #4 from Simon Marchi <simark at simark dot ca> ---
The problem appears to be with the computation of the node address, here:

---
/* For element types that keep the node as member field.  */

template<typename T, intrusive_list_node<T> T::*MemberNode>
struct intrusive_member_node
{
  static intrusive_list_node<T> *as_node (T *elem)
  { return &(elem->*MemberNode); }
};
---

I stopped at the first internal error.  Going up a few frames, the thread_info
object's address is:

(gdb) p thread
$1 = (thread_info *) 0x517000050180

The address of its `resumed_with_pending_wait_status_node` member is (btw
printing this expression took like 10 seconds, it might be good to dig to see
if that's normal):

(gdb) p &thread->resumed_with_pending_wait_status_node 
$2 = (intrusive_list_node<thread_info> *) 0x5170000503d0

However, in the `intrusive_list<thread_info>::push_back` frame, `elem_node` is:

(gdb) p elem_node
$3 = (intrusive_list_node<thread_info> *) 0x5170000503d8

We would expect `elem_node` to be equal to `$2` above.

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