https://bz.apache.org/bugzilla/show_bug.cgi?id=57653
Mark Thomas <ma...@apache.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Product|Tomcat 9 |Tomcat Native
Hardware|PC |Macintosh
Component|Connectors |Library
Version|unspecified |1.1.32
Target Milestone|----- |---
--- Comment #5 from Mark Thomas <ma...@apache.org> ---
I think I have got to the bottom of this.
Looking at the docs for apr_pollset_poll [1], it states "Multiple signalled
conditions for the same descriptor may be reported in one or more returned
apr_pollfd_t structures, depending on the implementation.".
The crash is occurring when the socket is registered for read and write.
The tc-native code assumes that there is only ever one returned structure per
descriptor.
The unit test + modified code I am using just happens - if the timing is right
- to register a socket for read and write which almost instantly becomes
available for both. It looks like OSX rerurns mutiple apr_pollfd_t structures
for mutliple events on the same descriptor and that triggers the crash.
I've thrown together a quick patch to test this theory and the unit test has
been running in a loop now for 20+ minutes without crashing so I am fairly
confident this is the issue.
[1]
http://apr.apache.org/docs/apr/1.4/group__apr__poll.html#ga6b31d7b3a7b2d356370403dd2b79ecf3
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