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List:       busybox
Subject:    ash: Segfault during subshell with built-in command (uClibc, i386)
From:       Ryan Finnie <ryan () finnie ! org>
Date:       2014-03-29 4:22:31
Message-ID: 53364A87.6010504 () finnie ! org
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Hello, I'm receiving a segfault when doing the following:

ryan@host:~$ ./busybox ash
~ $ FOO="$(echo internal)"
Segmentation fault
~ $ echo $FOO
internal
~ $ FOO="$(./busybox echo external)"
~ $ echo $FOO
external
~ $ testfunction() {
> echo function
> }
~ $ FOO="$(testfunction)"
Segmentation fault
~ $ echo $FOO
function
~ $

The segfault appears to be functionally spurious; the subshell still
returns the expected values.  It appears to be a combination of:

1) Subshell with built-in commands
2) i386 target (x86_64 and ppc 32-bit work)
3) uClibc toolchain (host glibc works)

I've tested this against the current git tree.  Any help would be
appreciated, thank you.

RF


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