Bug 795992

That's, erm... cute.

We had a report of massive slowness for some people in bug 795050.  I dropped an RCU related patch because of it that might be causing this.  I will admit that is just a slightly educated guess, but if you could try:

http://koji.fedoraproject.org/koji/taskinfo?taskID=3809140

when it completes we'll know for sure.

Created attachment 565056 [details]
console log of boot attempt with updated kernel

I built a custom boot.iso with the kernel mentioned in comment#1

I see the same symptoms on boot with a slightly different stack trace. I wonder if the following warning is at all related:

------------[ cut here ]------------
WARNING: at drivers/iommu/dmar.c:492 warn_invalid_dmar+0x92/0xa0()
Hardware name: HP xw4600 Workstation
Your BIOS is broken; DMAR reported at address fed90000 returns all ones!
BIOS vendor: Hewlett-Packard; Ver: 786F3 v01.22; Product Version:  
Modules linked in:
Pid: 0, comm: swapper Not tainted 3.3.0-0.rc3.git7.2.fc17.x86_64 #1
Call Trace:
 [<ffffffff81060bef>] warn_slowpath_common+0x7f/0xc0
 [<ffffffff81060c8f>] warn_slowpath_fmt_taint+0x3f/0x50
 [<ffffffff81044119>] ? native_flush_tlb_single+0x9/0x10
 [<ffffffff81f0aa98>] ? __early_set_fixmap+0x99/0xa0
 [<ffffffff815390f2>] warn_invalid_dmar+0x92/0xa0
 [<ffffffff81f34f9f>] check_zero_address+0xc8/0xf7
 [<ffffffff816ab0df>] ? bad_to_user+0x7f9/0x7f9
 [<ffffffff81f34fe5>] detect_intel_iommu+0x17/0xb9
 [<ffffffff81efe068>] pci_iommu_alloc+0x4a/0x73
 [<ffffffff81f0a857>] mem_init+0x19/0xed
 [<ffffffff816900b5>] ? set_nmi_gate+0x48/0x4a
 [<ffffffff81ef6a3a>] start_kernel+0x1f4/0x407
 [<ffffffff81ef6346>] x86_64_start_reservations+0x131/0x135
 [<ffffffff81ef644a>] x86_64_start_kernel+0x100/0x10f
---[ end trace a7919e7f17c0a725 ]---

(In reply to comment #2)
> Created attachment 565056 [details]
> console log of boot attempt with updated kernel
> 
> I built a custom boot.iso with the kernel mentioned in comment#1

Erm... I think whatever you did went wrong.  3.3.0-rc3.git7.2.fc17.x86_64 is the kernel you originally had issues with.  The kernel I built in comment #1 is 3.3.0-rc4.git1.4

> I see the same symptoms on boot with a slightly different stack trace. I wonder
> if the following warning is at all related:
> 
> ------------[ cut here ]------------
> WARNING: at drivers/iommu/dmar.c:492 warn_invalid_dmar+0x92/0xa0()
> Hardware name: HP xw4600 Workstation
> Your BIOS is broken; DMAR reported at address fed90000 returns all ones!
> BIOS vendor: Hewlett-Packard; Ver: 786F3 v01.22; Product Version:  
> Modules linked in:

Broken BIOSes are usually pretty crappy.  Look for an update or boot with iommu=off

(In reply to comment #3)
> Erm... I think whatever you did went wrong.  3.3.0-rc3.git7.2.fc17.x86_64 is
> the kernel you originally had issues with.  The kernel I built in comment #1 is 3.3.0-rc4.git1.4

Crap, I didn't notice that. One of these days, I'm going to fix this iso building script to quit when it can't find the updated builds I want.

Will retry, verifying the presence of the updated kernel this time.

OK, I built another custom boot.iso using the right kernel this time.

I am now able to boot into the installer without issue. The new kernel appears to have fixed the problem I was seeing.

(In reply to comment #5)
> OK, I built another custom boot.iso using the right kernel this time.
> 
> I am now able to boot into the installer without issue. The new kernel appears
> to have fixed the problem I was seeing.

Thanks Tim.  I'll get this queued up as an update today.

kernel-3.3.0-0.rc4.git1.4.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/kernel-3.3.0-0.rc4.git1.4.fc17

Package kernel-3.3.0-0.rc4.git1.4.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing kernel-3.3.0-0.rc4.git1.4.fc17'
as soon as you are able to, then reboot.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-2304/kernel-3.3.0-0.rc4.git1.4.fc17
then log in and leave karma (feedback).

kernel-3.3.0-0.rc4.git1.4.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.