Complete freeze if high traffic on standard serial line on ia32?

Complete freeze if high traffic on standard serial line on ia32?

[Etienne Lorrain]

 Hi,

 I can reliably (6 times in one hour) freeze completely (Scroll lock/Caps lock
flashing together, mouse frozen in X) my PC (AMD sempron on MSI K8MM3-V K8M800
Socket 754) by doing an FTP using a standard modem connected on the serial port
of the motherboard, and a bit of browsing (i.e. machine not loaded).
 That happens on standard Fedora 7 kernel and on the latest 23-rc1 kernel, and
doesn't happen on a Puppy Linux 2.17 bootable CDROM.

 Etienne.


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Re: Complete freeze if high traffic on standard serial line on ia32?

[Alan Cox]

>  I can reliably (6 times in one hour) freeze completely (Scroll lock/Caps lock
> flashing together, mouse frozen in X) my PC (AMD sempron on MSI K8MM3-V K8M800
> Socket 754) by doing an FTP using a standard modem connected on the serial port
> of the motherboard, and a bit of browsing (i.e. machine not loaded).
>  That happens on standard Fedora 7 kernel and on the latest 23-rc1 kernel, and
> doesn't happen on a Puppy Linux 2.17 bootable CDROM.

Can you get this to happen outside of X at all (eg if you do a yum update
and pull in packages over the modem for a while with 2.6.23-rc1  does it
die). Just trying to work out what has become unstable.

Also worth trying to see if browsing web type stuff off a CD or local
files triggers it without the network link.

RE : Complete freeze if high traffic on standard serial line on ia32?

[Etienne Lorrain]

--- Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> Can you get this to happen outside of X at all (eg if you do a yum update
> and pull in packages over the modem for a while with 2.6.23-rc1  does it
> die). Just trying to work out what has become unstable.

 I'll try more stuff tonight. A wild guess of the problem would be the amount
of interrupts from the serial port (I was sending if that matters).
 I never seen the problem without the modem connection, this PC is stable
for ia32/ia64 for few months.

> Also worth trying to see if browsing web type stuff off a CD or local
> files triggers it without the network link.

 Browsing alone over the modem did not seem to trigger the problem, but
I will do more tests with/without X/browser and ia32/ia64 tonight.

 Etienne.



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RE : Re: Complete freeze if high traffic on standard serial line on ia32?

[Etienne Lorrain]

--- Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> >  I can reliably (6 times in one hour) freeze completely (Scroll lock/Caps lock
> > flashing together, mouse frozen in X) my PC (AMD sempron on MSI K8MM3-V K8M800
> > Socket 754) by doing an FTP using a standard modem connected on the serial port
> > of the motherboard, and a bit of browsing (i.e. machine not loaded).
> >  That happens on standard Fedora 7 kernel and on the latest 23-rc1 kernel, and
> > doesn't happen on a Puppy Linux 2.17 bootable CDROM.
> 
> Can you get this to happen outside of X at all (eg if you do a yum update
> and pull in packages over the modem for a while with 2.6.23-rc1  does it
> die). Just trying to work out what has become unstable.
> 
> Also worth trying to see if browsing web type stuff off a CD or local
> files triggers it without the network link.

 Did a few more tests:
 - Cannot reproduce without X running and on display (i.e. Crtl-Alt-F1 and FTP works)
 - Tried another video board (Matrox AGP) and everything works.
 - With the motherboard integrated video (identified by its VESA BIOS name as
 VIA K8M800), it can fail even without doing an FTP - but you need to browse - i.e.
 serial modem connection needs to be active. This video card claims to use shared
 video memory.
 - I tried to find few logs files of X (I do not know much in this area) but since
 I have added the Matrox AGP board, and removed it, X refuses to start. I did not
 have time to inverstigate why.

 Etienne.


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