gh-138122: Skip threads on EPERM in blocking mode profiler#143368
Merged
Uh oh!
There was an error while loading. Please reload this page.
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters
pablogsal added type-bug 
When using blocking mode in the remote debugging profiler, ptrace calls to seize threads can fail with EPERM if the thread has exited between listing and attaching, is in a special kernel state, or is already being traced. Previously this raised a RuntimeError that was caught by the Python sampling loop,and retried indefinitely since EPERM is a persistent condition that will not resolve on its own. Treat EPERM the same as ESRCH by returning 1 (skip this thread) instead of -1 (fatal error). This allows profiling to continue with the threads that can be traced rather than entering an endless retry loop printing the same error message repeatedly.
ambv merged commit 27434c6 into python:main 46 checks passed
Uh oh!
There was an error while loading. Please reload this page.
Sign up for freeto join this conversation on GitHub. Already have an account? Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
When using blocking mode in the remote debugging profiler, ptrace calls
to seize threads can fail with EPERM if the thread has exited between
listing and attaching, is in a special kernel state, or is already being
traced. Previously this raised a RuntimeError that was caught by the
Python sampling loop,and retried indefinitely since EPERM is
a persistent condition that will not resolve on its own.
Treat EPERM the same as ESRCH by returning 1 (skip this thread) instead
of -1 (fatal error). This allows profiling to continue with the threads
that can be traced rather than entering an endless retry loop printing
the same error message repeatedly.