May 2023 - ruby-core - ml.ruby-lang.org

[ruby-core:113615] [Ruby master Bug#16265] Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2
by ioquatix (Samuel Williams) 24 May '23

24 May '23

Issue #16265 has been updated by ioquatix (Samuel Williams). @shyouhei Do you think we should add something like: ``` #ifdef _WIN32 #include "ruby/win32.h" #endif ``` to `ruby.h`? ---------------------------------------- Bug #16265: Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2 https://bugs.ruby-lang.org/issues/16265#change-103259 * Author: MSP-Greg (Greg L) * Status: Open * Priority: Normal * Assignee: ioquatix (Samuel Williams) * ruby -v: ruby 2.7.0dev (2019-10-19T08:19:27Z master 1d435bd51a) [x64-mingw32] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- GH PR https://github.com/ruby/ruby/pull/2573 was a work-around that forced using some non-current MSYS2 packages libraries for building. These libraries are only available on Appveyor because their images are out-of-date, a new MSYS2 install would not have them. Using current MSYS2 libraries requires adding '-fstack-protector' to LDFLAGS. I also experimented with adding 'D_FORTIFY_SOURCE=2' to CFLAGS. Ruby build/compiles with those flags added. test-all passes. But spec tests always lock up when running: ``` C-API Thread function rb_thread_call_without_gvl - runs a C function with the global lock unlocked - runs a C function with the global lock unlocked amd unlocks IO with the generic RUBY_UBF_IO ``` The tests are in spec/ruby/optional/capi/thread_spec.rb, as shown: https://github.com/ruby/ruby/blob/1d435bd51aeca75f6e437bc92de2271a716a1ced/… and the freeze occurs on line 137. I've run this once in ruby-loco, twice in my ruby fork, and several times locally. In all runs, test-all passed, and spec stopped at the test above. This uses gcc 9.2.0, and the problem would occur with anyone doing a 'fresh' install of MSYS2. Not being a c type, this is way beyond what I can fix. Happy to try patches, etc. Thanks, Greg -- https://bugs.ruby-lang.org/

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[ruby-core:113611] [Ruby master Bug#16265] Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2
by ioquatix (Samuel Williams) 24 May '23

24 May '23

Issue #16265 has been updated by ioquatix (Samuel Williams). Okay, the root cause of the hang is because `read` in `thread_spec.c` is not `rb_w32_read`. Something is clobbering the included `#define read rb_w32_read`. ---------------------------------------- Bug #16265: Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2 https://bugs.ruby-lang.org/issues/16265#change-103255 * Author: MSP-Greg (Greg L) * Status: Open * Priority: Normal * Assignee: ioquatix (Samuel Williams) * ruby -v: ruby 2.7.0dev (2019-10-19T08:19:27Z master 1d435bd51a) [x64-mingw32] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- GH PR https://github.com/ruby/ruby/pull/2573 was a work-around that forced using some non-current MSYS2 packages libraries for building. These libraries are only available on Appveyor because their images are out-of-date, a new MSYS2 install would not have them. Using current MSYS2 libraries requires adding '-fstack-protector' to LDFLAGS. I also experimented with adding 'D_FORTIFY_SOURCE=2' to CFLAGS. Ruby build/compiles with those flags added. test-all passes. But spec tests always lock up when running: ``` C-API Thread function rb_thread_call_without_gvl - runs a C function with the global lock unlocked - runs a C function with the global lock unlocked amd unlocks IO with the generic RUBY_UBF_IO ``` The tests are in spec/ruby/optional/capi/thread_spec.rb, as shown: https://github.com/ruby/ruby/blob/1d435bd51aeca75f6e437bc92de2271a716a1ced/… and the freeze occurs on line 137. I've run this once in ruby-loco, twice in my ruby fork, and several times locally. In all runs, test-all passed, and spec stopped at the test above. This uses gcc 9.2.0, and the problem would occur with anyone doing a 'fresh' install of MSYS2. Not being a c type, this is way beyond what I can fix. Happy to try patches, etc. Thanks, Greg -- https://bugs.ruby-lang.org/

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[ruby-core:113606] [Ruby master Bug#16265] Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2
by ioquatix (Samuel Williams) 24 May '23

24 May '23

Issue #16265 has been updated by ioquatix (Samuel Williams). Assignee set to ioquatix (Samuel Williams) ---------------------------------------- Bug #16265: Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2 https://bugs.ruby-lang.org/issues/16265#change-103249 * Author: MSP-Greg (Greg L) * Status: Open * Priority: Normal * Assignee: ioquatix (Samuel Williams) * ruby -v: ruby 2.7.0dev (2019-10-19T08:19:27Z master 1d435bd51a) [x64-mingw32] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- GH PR https://github.com/ruby/ruby/pull/2573 was a work-around that forced using some non-current MSYS2 packages libraries for building. These libraries are only available on Appveyor because their images are out-of-date, a new MSYS2 install would not have them. Using current MSYS2 libraries requires adding '-fstack-protector' to LDFLAGS. I also experimented with adding 'D_FORTIFY_SOURCE=2' to CFLAGS. Ruby build/compiles with those flags added. test-all passes. But spec tests always lock up when running: ``` C-API Thread function rb_thread_call_without_gvl - runs a C function with the global lock unlocked - runs a C function with the global lock unlocked amd unlocks IO with the generic RUBY_UBF_IO ``` The tests are in spec/ruby/optional/capi/thread_spec.rb, as shown: https://github.com/ruby/ruby/blob/1d435bd51aeca75f6e437bc92de2271a716a1ced/… and the freeze occurs on line 137. I've run this once in ruby-loco, twice in my ruby fork, and several times locally. In all runs, test-all passed, and spec stopped at the test above. This uses gcc 9.2.0, and the problem would occur with anyone doing a 'fresh' install of MSYS2. Not being a c type, this is way beyond what I can fix. Happy to try patches, etc. Thanks, Greg -- https://bugs.ruby-lang.org/

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[ruby-core:113605] [Ruby master Bug#16265] Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2
by ioquatix (Samuel Williams) 24 May '23

24 May '23

Issue #16265 has been updated by ioquatix (Samuel Williams). I'm going to see if we can fix this. https://github.com/ruby/ruby/pull/7848 ---------------------------------------- Bug #16265: Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2 https://bugs.ruby-lang.org/issues/16265#change-103248 * Author: MSP-Greg (Greg L) * Status: Open * Priority: Normal * ruby -v: ruby 2.7.0dev (2019-10-19T08:19:27Z master 1d435bd51a) [x64-mingw32] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- GH PR https://github.com/ruby/ruby/pull/2573 was a work-around that forced using some non-current MSYS2 packages libraries for building. These libraries are only available on Appveyor because their images are out-of-date, a new MSYS2 install would not have them. Using current MSYS2 libraries requires adding '-fstack-protector' to LDFLAGS. I also experimented with adding 'D_FORTIFY_SOURCE=2' to CFLAGS. Ruby build/compiles with those flags added. test-all passes. But spec tests always lock up when running: ``` C-API Thread function rb_thread_call_without_gvl - runs a C function with the global lock unlocked - runs a C function with the global lock unlocked amd unlocks IO with the generic RUBY_UBF_IO ``` The tests are in spec/ruby/optional/capi/thread_spec.rb, as shown: https://github.com/ruby/ruby/blob/1d435bd51aeca75f6e437bc92de2271a716a1ced/… and the freeze occurs on line 137. I've run this once in ruby-loco, twice in my ruby fork, and several times locally. In all runs, test-all passed, and spec stopped at the test above. This uses gcc 9.2.0, and the problem would occur with anyone doing a 'fresh' install of MSYS2. Not being a c type, this is way beyond what I can fix. Happy to try patches, etc. Thanks, Greg -- https://bugs.ruby-lang.org/

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[ruby-core:112505] [Ruby master Bug#19452] `Thread::Backtrace::Location` should have column information if possible.
by ioquatix (Samuel Williams) 23 May '23

23 May '23

Issue #19452 has been reported by ioquatix (Samuel Williams). ---------------------------------------- Bug #19452: `Thread::Backtrace::Location` should have column information if possible. https://bugs.ruby-lang.org/issues/19452 * Author: ioquatix (Samuel Williams) * Status: Open * Priority: Normal * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- I discussed this with @mame and it would be pretty useful if we could also get the column information from exception backtrace location, even if it was slow. A POC: ```ruby class Thread::Backtrace::Location if defined?(RubyVM::AbstractSyntaxTree) def first_column RubyVM::AbstractSyntaxTree.of(self, keep_script_lines: true).first_column end else def first_column raise NotImplementedError end end end ``` It would be good to have a standard interface, so we follow the same interface as https://bugs.ruby-lang.org/issues/19451 and vice versa where it makes sense. I'll investigate it. -- https://bugs.ruby-lang.org/

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[ruby-core:113599] [Ruby master Bug#16265] Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2
by ioquatix (Samuel Williams) 23 May '23

23 May '23

Issue #16265 has been updated by ioquatix (Samuel Williams). For some reason, this also started breaking on Windows in this PR and I had to disable it https://github.com/ruby/ruby/pull/7827/files I cannot see how anything in my PR would impact the test that was hanging. It seems like it might relate to the method length, so I might try reworking the PR to move the `pread`/`pwrite` functionality into a separate function completely. However, I don't see why it should matter at all. ---------------------------------------- Bug #16265: Test (spec) failure using current MSYS2 tools, related to -fstack-protector and possibly D_FORTIFY_SOURCE=2 https://bugs.ruby-lang.org/issues/16265#change-103240 * Author: MSP-Greg (Greg L) * Status: Open * Priority: Normal * ruby -v: ruby 2.7.0dev (2019-10-19T08:19:27Z master 1d435bd51a) [x64-mingw32] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN ---------------------------------------- GH PR https://github.com/ruby/ruby/pull/2573 was a work-around that forced using some non-current MSYS2 packages libraries for building. These libraries are only available on Appveyor because their images are out-of-date, a new MSYS2 install would not have them. Using current MSYS2 libraries requires adding '-fstack-protector' to LDFLAGS. I also experimented with adding 'D_FORTIFY_SOURCE=2' to CFLAGS. Ruby build/compiles with those flags added. test-all passes. But spec tests always lock up when running: ``` C-API Thread function rb_thread_call_without_gvl - runs a C function with the global lock unlocked - runs a C function with the global lock unlocked amd unlocks IO with the generic RUBY_UBF_IO ``` The tests are in spec/ruby/optional/capi/thread_spec.rb, as shown: https://github.com/ruby/ruby/blob/1d435bd51aeca75f6e437bc92de2271a716a1ced/… and the freeze occurs on line 137. I've run this once in ruby-loco, twice in my ruby fork, and several times locally. In all runs, test-all passed, and spec stopped at the test above. This uses gcc 9.2.0, and the problem would occur with anyone doing a 'fresh' install of MSYS2. Not being a c type, this is way beyond what I can fix. Happy to try patches, etc. Thanks, Greg -- https://bugs.ruby-lang.org/

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[ruby-core:113591] [Ruby master Feature#17325] Adds Fiber#cancel, which forces a Fiber to break/return
by ioquatix (Samuel Williams) 22 May '23

22 May '23

Issue #17325 has been updated by ioquatix (Samuel Williams). Status changed from Open to Closed We introduced `Fiber#kill` which behaves exactly as requested by the proposal. > Calling Fiber#cancel will force a fiber to return, skipping rescue and catch blocks but running all ensure blocks. It behaves as if a break or return were used to jump from the last suspension point to the top frame of the fiber. Control will be transferred to the canceled fiber so it can run its ensure blocks. ---------------------------------------- Feature #17325: Adds Fiber#cancel, which forces a Fiber to break/return https://bugs.ruby-lang.org/issues/17325#change-103230 * Author: nevans (Nicholas Evans) * Status: Closed * Priority: Normal ---------------------------------------- Calling `Fiber#cancel` will force a fiber to return, skipping rescue and catch blocks but running all ensure blocks. It behaves as if a `break` or `return` were used to jump from the last suspension point to the top frame of the fiber. Control will be transferred to the canceled fiber so it can run its ensure blocks. ## Propagation from resuming to resumed fibers Any non-root living fiber can be canceled and cancellation will propagate to child (resumed) fibers. In this way, a suspended task can be canceled even if it is e.g. resuming into an enumerator, and the enumerator will be canceled as well. Transfer of control should match #17221's *(much improved)* transfer/resume semantics. After the cancellation propagates all the way to the bottom of the fiber resume stack, the last fiber in the chain will then be resumed. Resuming fibers will not run until they are yielded back into. ## Suspension of canceled fibers Canceled fibers can still transfer control with `resume`, `yield`, and `transfer`, which may be necessary in order to release resources from `ensure` blocks. For simplicity, subsequent cancels will behave similarly to calling `break` or `return` inside an `ensure` block, and the last cancellation reason will overwrite earlier reasons. ## Alternatives `Fiber#raise` could be used, but: * Can only raise on resumable fibers. * Cannot propagate cancellation down to resumed fibers. * Exceptions are bigger and slower than `break`. * `#raise` can't (and shouldn't) be sent to resuming fibers. (It can't propagate.) * Exceptions can be caught. This might be desirable, but that should be at the discretion of the calling fiber. Catch/Throw could be used (with an anonymous `Object.new`), but: * We would need to add `Fiber#throw` (or wrap/intercept `Fiber.yield`). * A hypothetical `Fiber#throw` should probably have similar semantics to `#resume` and thus only be allowed on resumable fibers. * In that case, it wouldn't propagate down to resumed fibers. * `catch` adds an extra stack frame. We could use go-style "Context" objects that contain a "done?" queue/future. * These would need to be explicitly passed around. * Although their usage could be enforced via linters like rubocop, I think that placing it off to the side will give developers the impression that it is optional Some sort of cancel propagation mechanism is not optional for structured concurrency. * It should built into any task-scheduler library, which would allow application code to use it explicitly. * But this suffers the same problem as current Fiber wrappers: it works fine if your code uses the wrapper, but code that uses fibers without the wrapper can be incompatible and introduce bugs (e.g. fibers that are released without running their `ensure` blocks). * This make sense for a language like go which doesn't have exceptions but does have a convention of returning an "error" value. It feels out of place in ruby, IMO. Letting the fiber-task-scheduler mitigates that... for code that uses the fiber-task-scheduler. We could add a keyword option to `Fiber#raise` that gives it similar propagation semantics to this. * IMO, the simplicity of `Fiber#raise` simply being a specialized version of `Fiber#resume` is worth preserving. * The propagation changes alone are enough of a semantic difference to warrant a new method. We could implement `Fiber#cancel` by using `fiber.raise(FiberCancellationError)` on the bottom fiber and catching that exception during termination of the canceled fiber. * This would have the "benefit" that the exception could be rescued. * I might be wrong, but I think that doing this would mostly duplicate my PR, but with some added complexity around exception construction and catching. * It might be a good keyword option? e.g. `Fiber#cancel(with_exception: [true,#exception,#to_str])` Just let the task-fiber-scheduler library handle this. * That's what I'm already doing now. It's mostly fine. It works in my code. * Putting it into ruby core should lead to a small performance boost on very commonly repeated code. * There's probably a better way to store the `cancel_reason` that doesn't require the overhead of adding another `VALUE` to `rb_fiber_struct`. Maybe it can be placed directly into `errinfo`? * Although the common cases can be handled via a trampoline fiber or #17221, there can still be situations where your application's fiber-scheduler library might not know about fibers created by other libraries. This adds interoperability to a common scenario. * Coroutine cancellation is IMO a core feature. It's important to have something like this for all applications and libraries to use as a baseline for interoperability. Implementation: https://github.com/ruby/ruby/pull/3766 -- https://bugs.ruby-lang.org/

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[ruby-core:113588] [Ruby master Bug#19084] Using `IO::Buffer` to change an extended String affects other Strings sharing the same buffer
by ioquatix (Samuel Williams) 22 May '23

22 May '23

Issue #19084 has been updated by ioquatix (Samuel Williams). Merged in https://github.com/ruby/ruby/commit/bd786e78969f9d4a8699376ceafe10934b6ad533. ---------------------------------------- Bug #19084: Using `IO::Buffer` to change an extended String affects other Strings sharing the same buffer https://bugs.ruby-lang.org/issues/19084#change-103223 * Author: jemmai (Jemma Issroff) * Status: Open * Priority: Normal * ruby -v: master * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- When two extended Strings share a buffer, and one String's buffer changes, it currently affects the other String's buffer. Here is a snippet to demonstrate this: ``` string = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" other_string = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" IO::Buffer.for(string) do |buffer| buffer.set_value(:U8, 0, "*".ord) end other_string[0] == "a" # => false ``` [Here is a PR which adds the above example as a test](https://github.com/ruby/ruby/pull/6630), and is currently failing CI. (cc @ioquatix) -- https://bugs.ruby-lang.org/

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[ruby-core:113586] [Ruby master Bug#19084] Using `IO::Buffer` to change an extended String affects other Strings sharing the same buffer
by ioquatix (Samuel Williams) 22 May '23

22 May '23

Issue #19084 has been updated by ioquatix (Samuel Williams). This should be fixed by https://bugs.ruby-lang.org/issues/19084. ---------------------------------------- Bug #19084: Using `IO::Buffer` to change an extended String affects other Strings sharing the same buffer https://bugs.ruby-lang.org/issues/19084#change-103218 * Author: jemmai (Jemma Issroff) * Status: Open * Priority: Normal * ruby -v: master * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN ---------------------------------------- When two extended Strings share a buffer, and one String's buffer changes, it currently affects the other String's buffer. Here is a snippet to demonstrate this: ``` string = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" other_string = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" IO::Buffer.for(string) do |buffer| buffer.set_value(:U8, 0, "*".ord) end other_string[0] == "a" # => false ``` [Here is a PR which adds the above example as a test](https://github.com/ruby/ruby/pull/6630), and is currently failing CI. (cc @ioquatix) -- https://bugs.ruby-lang.org/

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[ruby-core:112072] [Ruby master Bug#19386] `test_hmac.rb` of openssl is timeout on RHEL9
by hsbt (Hiroshi SHIBATA) 22 May '23

22 May '23

Issue #19386 has been reported by hsbt (Hiroshi SHIBATA). ---------------------------------------- Bug #19386: `test_hmac.rb` of openssl is timeout on RHEL9 https://bugs.ruby-lang.org/issues/19386 * Author: hsbt (Hiroshi SHIBATA) * Status: Open * Priority: Normal * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- I prepared new test instance of RHEL9 for https://rubyci.org/. But it stuck with openssl tests. see http://rubyci.s3.amazonaws.com/rhel9/ruby-master/log/20230127T003004Z.fail.… I did bisect this issue. This issue caused by https://github.com/ruby/ruby/blob/master/test/openssl/test_hmac.rb#L23 ``` def test_dup h1 = OpenSSL::HMAC.new("KEY", "MD5") h1.update("DATA") h = h1.dup assert_equal(h1.digest, h.digest, "dup digest") end ``` Stuck is happened after running this test. /cc @vo.x @jaruga @rhenium -- https://bugs.ruby-lang.org/

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