gnu/77818: GDB locks in wait4() when running applications
Seán C. Farley
sean-freebsd at farley.org
Mon Feb 21 16:30:23 GMT 2005
The following reply was made to PR gnu/77818; it has been noted by GNATS.
From: =?ISO-8859-1?Q?Se=E1n_C=2E_Farley?= <sean-freebsd at farley.org>
To: "Greg 'groggy' Lehey" <grog at FreeBSD.org>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: gnu/77818: GDB locks in wait4() when running applications
Date: Mon, 21 Feb 2005 10:24:17 -0600 (CST)
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On Mon, 21 Feb 2005, Greg 'groggy' Lehey wrote:
> On Sunday, 20 February 2005 at 19:15:01 -0600, Sean Farley wrote:
>>
>>> Synopsis: GDB locks in wait4() when running applications
>>
>>> Description:
>>
>> Whenever I run an application through the system's GDB, GDB locks in
>> wait4(). It does not matter if the application has debugging
>> information or not. /bin/ls will lock GDB up for me until I type
>> Ctrl-C.
>
> Is this an SMP system?
Neither system is SMP nor using HyperThreading. sysctl shows that the
systems believe they only have one CPU (as expected).
>> Two systems of mine exhibit this behavior. One has the binary nvidia
>> driver with a lot of changes in libmap.conf. The other is headless
>> without a libmap.conf.
>
> I've found something similar with SMP systems only. It wasn't as
> consistent as the way you describe, and I was able to work around the
> problem by turning off all but one CPU. See kern/77537 for more
> details.
It does sound similar. I wonder if it was something MFC'd from CURRENT,
but I do not remember when it started hanging.
Se=E1n
--=20
sean-freebsd at farley.org
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