Re: GC issue in mono 0.31

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Hello Hans,

You are right probably that there are actually two separate
problems (I was lucky enough to hit both).

Returning to dynamic linking issue, attached is the output
with GC_add_roots_inner arguments included + /proc/<mono>/maps.
(Some addresses have probably changed somewhat, so it might not
exactly match previously posted nm output)
-- 
Best regards,
 Nikolai Zhubr

Wednesday, 05 May, 2004, 23:35:52, you wrote:

> [I added the gc-V9/[email protected] list, since this may be of interest to others
> there.]

> I have a plausible explanation for the Linux 2.6.5 failure.  I encountered
> a similar problem on a 2.6 Itanium machine here.  The problem is that the
> incremental collector write protects an internal GC data structure, which
> the thread-stopping signal handler tries to write.  Unfortunately SIGSEGV
> is blocked in that handler.  This problem appears to be fairly old, but
> 2.6 kernels seem to schedule things differently, so that the probability of
> hitting it goes from approximately zero to approximately one.

> I'll release my current snapshot as 6.3alpha6 later today, so that we can
> verify this.

> However, this problem occurs only with incremental GC enabled, which is
> rare, and almost certainly not the case for Mono.  The symptoms are also
> quite different from the Mono dynamic linking failure.  It still looks to
> me like the Mono gc is picking up the wrong _end definition.  And it would
> be good to track that down by looking at the GC_add_roots_inner call.

> Hans

>> -----Original Message-----
>> From: Nikolai Zhubr [mailto:[email protected]]
>> Sent: Wednesday, May 05, 2004 9:06 AM
>> To: Boehm, Hans; [email protected]
>> Subject: Re: GC issue in mono 0.31
>> 
>> 
>> Hans,
>> My previous post appeared to be somewhat inexact.
>> The latest results are:
>> 
>> * gctest works on 2.4.20 kernel and fails on 2.6.5 one,
>>  doesn't matter if linked statically or dynamically;
>> 
>> * mono runtime fails on 2.4.20 and 2.6.5 when linked
>>  dynamically, but works on both kernels when linked
>>  statically.
>> 
>> I think this is a tolerable workaround for me now,
>> however still I can provide whatever information
>> developers might need in order to fix the issue.
>> -- 
>> Best regards,
>>  Nikolai Zhubr
>> 
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