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Re: [Libunwind-devel] deadlock in get_rs_cache

From: Arun Sharma
Subject: Re: [Libunwind-devel] deadlock in get_rs_cache
Date: Thu, 14 Jan 2016 15:54:27 -0800

On Tue, Jan 12, 2016 at 10:40 AM, Howard Chu <address@hidden> wrote:
> Howard Chu wrote:
>> Using libunwind 1.1 on SLES with my own malloc tracer, I get a deadlock in
>> various places, e.g.:
> The same thing happens with gperftools heap checker.

The deadlock I know about happens because dl_iterate_phdr(), something
libunwind calls to locate unwind information is not async signal safe
because it calls malloc.

To make libunwind usable in a malloc tracer, people generally
implement their own dl_iterate_phdr() that doesn't call malloc.
libunwind-1.1 is old and I've not been able to devote enough time to
libunwind to make a new release.

You may be able to avoid this particular lock by choosing UNW_CACHE_PER_THREAD.


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