RawhideKernelNodebug - Boot

poma pomidorabelisima at gmail.com
Wed Feb 5 05:46:33 UTC 2014


On 31.01.2014 11:47, poma wrote:

> This is what I thought,
> 
> A video mode, boot loader parameter i.e. "vga=" expressed in a decimal
> notation e.g. 773 is broken - the boot is stuck, however one expressed
> in a hexadecimal notation (starting with "0x") e.g. 0x305, no problemos
> at all.
> To be more precise, what is interesting in this story, is an erratic
> occurrence of this problem,
> e.g.
> - Rawhide's 3.14.0-0.rc0.git15.1.fc21.x86_64 - a decimal notation
> *sometimes* works
> - RawhideKernelNodebug's 3.14.0-0.rc0.git15.2.fc21.x86_64 - a decimal
> notation *never* works
> - Rawhide's 3.14.0-0.rc0.git17.1.fc21.x86_64 - a decimal notation
> *sometimes* works

To complement and finish.

"The kernel hang/crash/stuck/whatnot during boot" is resolved with these
two patches:
- [PATCH 1/2] numa, mem-hotplug: Initialize numa_kernel_nodes in
numa_clear_kernel_node_hotplug().
  http://marc.info/?l=linux-kernel&m=139089978307936&q=raw
- [PATCH 2/2] numa, mem-hotplug: Fix array index overflow when
synchronizing nid to memblock.reserved.
  http://marc.info/?l=linux-kernel&m=139089984707944&q=raw

Tested via:
- kernel-3.14.0-0.rc1.git0.2.fc21.x86_64.rpm
  http://koji.fedoraproject.org/koji/buildinfo?buildID=496017
  "Add NUMA oops patches"
  http://pkgs.fedoraproject.org/cgit/kernel.git/plain/tang-numa-1.patch
  http://pkgs.fedoraproject.org/cgit/kernel.git/plain/tang-numa-2.patch
- my nodebug version,
  kernel-3.14.0-0.rc1.git0.4.fc21.x86_64.rpm

  Both are PASSED.

Affected Fedora's kernels:
- kernel-3.14.0-0.rc1.git0.1.fc21
- kernel-3.14.0-0.rc0.git19.1.fc21
- kernel-3.14.0-0.rc0.git18.1.fc21
- kernel-3.14.0-0.rc0.git17.1.fc21
  http://koji.fedoraproject.org/koji/packageinfo?packageID=8

Badly affected was this card:
Chipset: G98 (NV98)
Family : NV50
NVIDIA Corporation G98 [GeForce 8400 GS Rev. 2] [10de:06e4] (rev a1)
Nouveau

While this one worked without problemos: !?
Chipset: MCP79/MCP7A (NVAC)
Family : NV50
NVIDIA Corporation ION VGA [10de:087d] (rev b1)
Nouveau

Another notes.
After the affected kernel hang at the very beginning of the
loading/booting due to the mentioned application of the vesa mode, it
was necessary to power off machine, otherwise correct kernels would
become affected.
Just to reset machine wasn't enough.
At the end, even a hexadecimal notation became broken. :)


Ahoy folks!
poma


More about this can be found here:
- [PATCH] numa, mem-hotplug: Fix stack overflow in numa when seting
kernel nodes to unhotpluggable.
  http://thread.gmane.org/gmane.linux.kernel/1634270
- [PATCH 0/2] numa, mem-hotplug: Fix array out of boundary in numa
initialization.
  http://thread.gmane.org/gmane.linux.kernel/1636585


The TOG:

  +---------------------------------------------------------+
  |  color  |     800x600   |    1024x768   |    1280x1024  |
  |    :    |---------------+---------------+---------------|
  |  depth  |   hex  : dec  |   hex  : dec  |   hex  : dec  |
  |---------+--------:------+--------:------+--------:------|
  |   256   |  0x303 : 771  |  0x305 : 773  |  0x307 : 775  |
  |   64k   |  0x314 : 788  |  0x317 : 791  |  0x31A : 794  |
  |   16M   |  0x315 : 789  |  0x318 : 792  |  0x31B : 795  |
  +---------------------------------------------------------+


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