Messages in this thread |  | | Date | Wed, 24 Jul 1996 14:26:33 -0400 (EDT) | From | "Mark T. Gray" <> | Subject | Re: psaux broken |
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On Wed, 24 Jul 1996, Mark T. Gray (I) wrote: > On Mon, 22 Jul 1996, Petri T J Mattila wrote: > > > Hi, > > > > linux-2.0.8 seems to break psaux somehow. > > > > A couple of minutes after boot, system just hangs. > > Even virtual consoles does not work anymore. > > There is only one message in the syslog: > > 'psaux: controller timeout' > > > > If I let psaux module unloaded, everything works well. > > > > BTW, what possibilities do I have to debug kernel > > in this kind of situation ? > > > > > > -- Petri > > I have had a similar problem with 2.0.8 when I start X while dip is calling > my ISP -- the loading of X stops and I get bumped out to the login prompt, > however the keyboard is totally dead and I have to shutdown from my dumb > terminal. (The kernel continues working, and I usually let it download my > mail before rebooting). > > I couldn't figure out which of the 6 'psaux: controller timeout' printk's > was involved so I numbered them -- the problem went away! (at least for this > morning and yesterday's many "recreation" attempts). It seems like there is > some timing critical thing happening between the serial ports and psaux. My > psaux is built into the kernel so it is not a module problem alone. > > I managed to recreate my problem, and using printk's have isolated it down to inside the aux_write_ack(AUX_ENABLE_DEV) call from line 370 inside the function open_aux of file psaux.c
It takes some careful (or unlucky!) timing of when to hit the enter key to startx to get it to happen -- apparently just after the modems finish negotiating and data begins to flow there is an opportunity for a long enough delay for something inside the aux_write_ack to timeout. When I start up X I start up 18 rxvt's, 2 xbiffs, oclock, and xosview so there is a considerable flurry of IDE disk accesses going on at that point.
I will add more printk's to isolate it further (this will take time as it is nearly bed-time and I'm getting stupid(er) :)
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