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Message-ID: <20171207162609.45e02f83@ncopa-desktop.copa.dup.pw> Date: Thu, 7 Dec 2017 16:26:09 +0100 From: Natanael Copa <ncopa@...inelinux.org> To: musl@...ts.openwall.com Subject: bug with sysconf(_SC_CHILD_MAX) with user process ulimit set to unlimited Hi, While trying to debug why `bash -c 'sleep 1 & wait $!'` hangs with alpine in docker[1] I made an interesting discovery. Set user process ulimit to "unlimited" and run the following program on an x86_64 machine: #include <stdio.h> #include <unistd.h> int main() { long maxchild = sysconf(_SC_CHILD_MAX); printf("maxchild: %ld\n", maxchild); return 0; } With musl libc it prints: maxchild: 9223372036854775807 With glibc it prints: maxchild: -1 Setting the process ulimit to something like 64k makes bash work again. Shouldn't sysconf(_SC_CHILD_MAX) return -1 if ulimit is set to "unlimited"? Thanks! -nc [1]: https://github.com/tianon/docker-bash/issues/4
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