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Date: Tue, 6 Jan 2015 15:49:24 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: musl built with pcc yields segfaults in dynlink.c
On Mon, Jan 05, 2015 at 11:48:50PM -0800, Isaac Dunham wrote:
> Hello,
> I'm trying to get a pcc-built libc.so that works.
> With the latest PCC, musl builds (lib/libc.so) and the result will display
> the proper messages if run from the command line without arguments.
> However, if I try to run a program with it
> (even via -Wl,-dynamic-linker,`pwd`/lib/libc.so), I get a segfault
> in src/ldso/dynlink.c:
> (gdb) where
> #0 sysv_hash (s0=0x0, s0=0x0) at src/ldso/dynlink.c:177
> #1 0xb7f6f747 in find_sym (dso=0xbffffb18, rel=0xb7ffe1d4 <.L1502>,
> rel_size=<unknown type>, stride=<unknown type>, dso=0xbffffb18,
> rel=0xb7ffe1d4 <.L1502>, rel_size=<unknown type>, stride=<unknown type>)
> at src/ldso/dynlink.c:251
> #2 0xb7f6f916 in do_relocs () at src/ldso/dynlink.c:308
> Backtrace stopped: frame did not save the PC
>
> I'm using Alpine Linux edge, recently updated, with linux-vanilla.
It would be helpful to see the readelf -a output for libc.so and the
binary using it, and whatever information gdb can give on the value of
local vars at each of the above call frames.
Rich
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