From: mame@... Date: 2015-07-24T14:08:54+00:00 Subject: [ruby-core:70114] [Ruby trunk - Bug #11395] [Assigned] ruby gets stuck when entropy_avail is 0 Issue #11395 has been reported by Yusuke Endoh. ---------------------------------------- Bug #11395: ruby gets stuck when entropy_avail is 0 https://bugs.ruby-lang.org/issues/11395 * Author: Yusuke Endoh * Status: Assigned * Priority: Normal * Assignee: Nobuyoshi Nakada * ruby -v: ruby 2.3.0dev (2015-07-24 master 51364) [x86_64-linux] * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- When /proc/sys/kernel/random/entropy_avail is 0, Ruby gets stuck during initialization. $ ruby -v (stuck) This is caused by r51182. I think that the GRND_NONBLOCK flag should be set to getrandom syscall. The following patch works for me. But I have no idea to remove the magic number "1 (= GRND_NONBLOCK)". ~~~~ diff --git a/random.c b/random.c index 6452456..9ef89f9 100644 --- a/random.c +++ b/random.c @@ -523,11 +523,14 @@ fill_random_bytes_syscall(void *seed, size_t size) if (try_syscall) { long ret; errno = 0; - ret = syscall(SYS_getrandom, seed, size, 0); + ret = syscall(SYS_getrandom, seed, size, 1); if (errno == ENOSYS) { try_syscall = 0; return -1; } + if (errno == EAGAIN) { + return -1; + } if ((size_t)ret == size) return 0; } return -1; ~~~~ -- Yusuke Endoh <mame@ruby-lang.org> -- https://bugs.ruby-lang.org/