From: Rei.Odaira@... Date: 2016-03-11T00:21:43+00:00 Subject: [ruby-core:74273] [Ruby trunk Bug#9905] Fiber does not work on AIX Issue #9905 has been updated by Rei Odaira. Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN to 2.0.0: UNKNOWN, 2.1: REQUIRED Could you back-port this to 2.1 as well? Thanks. ---------------------------------------- Bug #9905: Fiber does not work on AIX https://bugs.ruby-lang.org/issues/9905#change-57399 * Author: Rei Odaira * Status: Assigned * Priority: Normal * Assignee: Yutaka Kanemoto * ruby -v: ruby 2.2.0dev (2014-06-02 trunk 45270) [powerpc-aix7.1.0.0] * Backport: 2.0.0: UNKNOWN, 2.1: REQUIRED ---------------------------------------- `test/ruby/test_fiber.rb` fails on AIX. ~~~ [ 2/23] TestFiber#test_argument/ss/home/rayod/Dev/Contribution/ruby-trunk-blue1/test/ruby/test_fiber.rb:19: [BUG] machine_stack_cache size is not canonicalized ruby 2.2.0dev (2014-06-02 trunk 45270) [powerpc-aix7.1.0.0] ~~~ Here is what happens for this test: 1. A fiber is created by setting `context->uc_stack.ss_size` to a certain value and calling `makecontext()`. 2. While the fiber is switched with other fibers by `swapcontext()`, `context->uc_stack.ss_size` is changed to a very large value by AIX. 3. When the fiber finishes, its stack pointer and size are cached in `machine_stack_cache[]`. 4. When a new fiber is created, a specified stack size is different from the cached stack size, so the error is thrown. I feel AIX's behavior is strange, but I also suppose in general, `context->uc_stack.ss_size` is not guaranteed to be preserved after `makecontext()` or `swapcontext()`. (Please correct me if I am wrong.) Rather than disabling `FIBER_USE_NATIVE` for AIX, I propose saving the original stack pointer and size not in `ucontext_t` but in new dedicated fields in `rb_fiber_t`, as you can find in the attached patch. With this patch, `test/ruby/test_fiber.rb` results in no errors on AIX. This did not cause any error on Linux, either, for test or test-all. ---Files-------------------------------- sp_and_size_for_fiber.patch (1.9 KB) -- https://bugs.ruby-lang.org/ Unsubscribe: