Re: Kernel 2.6.12 and 2.6.13 hangs for a while on boot

From: Andrew Morton
Date: Mon Jul 25 2005 - 16:48:21 EST

"Francisco Figueiredo Jr." <fxjrlists@xxxxxxxxxxxx> wrote:
> I'm having little hangs while booting with kernels 2.6.12 and 2.6.13-rc1, rc2
> and rc3.
> It is strange that 2.6.12-rc1 booted ok without hangs.
> I saw a post of Alan Cox on rc-1 release notes:
> "Old ISA/VESA systems sometimes put tertiary IDE controllers at addresses
> 0x1e8, 0x168, 0x1e0 or 0x160. Linux thus probes these addresses on x86
> systems. Unfortunately some PCI systems now use these addresses for other
> purposes which leads to users seeing minute plus hangs during boot or even
> crashes."
> I thought this could be my problem, but it still hangs on boot.
> Hangs appears just before mounting filesystems message and before configuring
> system to use udev.

Are these hangs temporary or permanent? If they are temporary (ie: the
kernel recovers OK) then we should call them "stalls". Because a "hang" is
considered to be a permanent state.

Either way, we need to know where the kernel is stuck. Adding
`initcall_debug' to your kernel boot command may help.

And when the hang/stall occurs, hit the ALT-SSQRQ-P and ALT-SYSRQ-T key
combinations and send us the resulting traces.

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