gh-118981: multiprocessing.popen_spawn_posix, fix potential hang#118982
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gpshead merged 3 commits intopython:mainfrom Sep 7, 2025
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gh-118981: multiprocessing.popen_spawn_posix, fix potential hang#118982gpshead merged 3 commits intopython:mainfrom
gpshead merged 3 commits intopython:mainfrom
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@gpshead ping? Or anyone else? |
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pythongh-118982) fix potential hang. It can happen that the child crashes right in the beginning for whatever reason. In this case, the parent will hang when writing into the pipe, because the child fd is not closed yet. The normal pattern is to close the child fds right after the child proc is forked/executed/spawned, so when the child dies, then also the pipes will be closed, and there will be no hang (the parent gets SIGPIPE instead). (cherry picked from commit 8ed5a2b) Co-authored-by: Albert Zeyer <albzey@gmail.com>
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pythongh-118982) fix potential hang. It can happen that the child crashes right in the beginning for whatever reason. In this case, the parent will hang when writing into the pipe, because the child fd is not closed yet. The normal pattern is to close the child fds right after the child proc is forked/executed/spawned, so when the child dies, then also the pipes will be closed, and there will be no hang (the parent gets SIGPIPE instead). (cherry picked from commit 8ed5a2b) Co-authored-by: Albert Zeyer <albzey@gmail.com>
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GH-138605 is a backport of this pull request to the 3.14 branch. |
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GH-138606 is a backport of this pull request to the 3.13 branch. |
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…ng (gh-118982) (#138606) gh-118981: multiprocessing.popen_spawn_posix, fix potential hang (gh-118982) fix potential hang. It can happen that the child crashes right in the beginning for whatever reason. In this case, the parent will hang when writing into the pipe, because the child fd is not closed yet. The normal pattern is to close the child fds right after the child proc is forked/executed/spawned, so when the child dies, then also the pipes will be closed, and there will be no hang (the parent gets SIGPIPE instead). (cherry picked from commit 8ed5a2b) Co-authored-by: Albert Zeyer <albzey@gmail.com>
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lkollar
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pythongh-118982) fix potential hang. It can happen that the child crashes right in the beginning for whatever reason. In this case, the parent will hang when writing into the pipe, because the child fd is not closed yet. The normal pattern is to close the child fds right after the child proc is forked/executed/spawned, so when the child dies, then also the pipes will be closed, and there will be no hang (the parent gets SIGPIPE instead).
encukou
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…ng (gh-118982) (GH-138605) fix potential hang. It can happen that the child crashes right in the beginning for whatever reason. In this case, the parent will hang when writing into the pipe, because the child fd is not closed yet. The normal pattern is to close the child fds right after the child proc is forked/executed/spawned, so when the child dies, then also the pipes will be closed, and there will be no hang (the parent gets SIGPIPE instead). (cherry picked from commit 8ed5a2b) Co-authored-by: Albert Zeyer <albzey@gmail.com>
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Fix gh-118981.
It can happen that the child crashes right in the beginning for whatever reason. In this case, the parent will hang when writing into the pipe, because the child fd is not closed yet.
The normal pattern is to close the child fds right after the child proc is forked/executed/spawned, so when the child dies, then also the pipes will get close, and there will be no hang (you get SIGPIPE instead).