This is mentioned in the developer notes, but isn't present in TSAN_OPTIONS, resulting in:
WARNING: ThreadSanitizer: lock-order-inversion (potential deadlock) (pid=60508)
Cycle in lock order graph: M0 (0xffff98e02208) => M1 (0xffff98e0cbe8) => M2 (0xffff98e0cd98) => M0
<snip>
Hint: use TSAN_OPTIONS=second_deadlock_stack=1 to get more informative warning message
Add it, for (potentially) more informative output, when failures occur. Checked that adding does output more information.