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Bug 2870 - Deadlock in SDL SIGINT and SIGTERM handling
Summary: Deadlock in SDL SIGINT and SIGTERM handling
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: *don't know* (show other bugs)
Version: 2.0.3
Hardware: x86_64 Linux
: P2 normal
Assignee: Ryan C. Gordon
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-02-07 10:20 UTC by Magnus Bjerke Vik
Modified: 2015-06-08 05:53 UTC (History)
1 user (show)

See Also:

Attachments
Backtrace for deadlock (1.21 KB, text/plain)
2015-02-07 10:20 UTC, Magnus Bjerke Vik 		Details
Code to reproduce deadlock (495 bytes, text/plain)
2015-02-07 10:24 UTC, Magnus Bjerke Vik 		Details
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Description Magnus Bjerke Vik 2015-02-07 10:20:26 UTC 
Created attachment 2023 [details]
Backtrace for deadlock

Receiving a SIGINT or SIGTERM while already inside malloc routines will cause the program to deadlock.

I've attached a backtrace from a case where the signal is received while freeing some allocated data.

I've also attached a simple program to reproduce the problem. It might have to be run a few times to ensure that the signal is received while in a malloc routine.

I've only tested this on Linux, yet. A simple workaround is to handle the signals yourself and avoid any malloc routines.
Comment 1 Magnus Bjerke Vik 2015-02-07 10:24:13 UTC 
Created attachment 2024 [details]
Code to reproduce deadlock

You might have to run the program a few times so that the signal is received while in a malloc routine. You can also increase the numAllocs.
Comment 2 Ryan C. Gordon 2015-06-08 05:53:49 UTC 
This is fixed now in https://hg.libsdl.org/SDL/rev/fd60d77139fc, thanks!

--ryan.