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Date: Mon, 21 Jan 2019 09:23:22 +0100
From: Florian Weimer <>
To: Hanno Böck <>
Subject: Re: Apache web server use after free bugs (unfixed)

* Hanno Böck:

> threading related error
> =======================
> In addition to the ASAN use after free reports, httpd logs threading
> related errors:
> AH00052: child pid [pid] exit signal Aborted (6)
> apache2: tpp.c:84: __pthread_tpp_change_priority: Assertion `new_prio
> == -1 || (new_prio >= fifo_min_prio && new_prio <= fifo_max_prio)'
> failed.

This can happen if the mutex data is corrupted, so it's possible this
also caused by a use-after-free issue (if the memory is reallocated and
overwritten before the mutex operation that causes the assertion

Did you observe this with the pool debugger only?


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