Bug 1466798

Summary: Can't boot Fedora 24/25/26 with kernel 4.8.*-4.11.* without iommu=soft
Product: [Fedora] Fedora Reporter: mrromanze
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: urgent Docs Contact:
Priority: unspecified    
Version: 26CC: cz172638, extras-qa, gansalmon, ichavero, itamar, jonathan, juhani.jaakola, kernel-maint, madhu.chinakonda, mchehab, mrromanze
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Hardware: x86_64   
OS: Unspecified   
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Clone Of: 1409201 Environment:
Last Closed: 2018-04-20 12:45:52 UTC Type: Bug
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Description mrromanze 2017-06-30 13:29:02 UTC 
+++ This bug was initially created as a clone of Bug #1409201 +++

Model: HP 15-ba028ur
AMD® A10-9600p radeon r5, 10 compute cores 4c+6g × 4 


ERROR MESSAGES:

AMD-Vi: Completion-Wait loop timed out
and
AMD-Vi: Event logged [IOTLB_INV_TIMEOUT device=...

With kernels 4.7.* the system boots fine.

When I boot the Fedora 25 LXDE Live CD (64-bit EFI version), I get the same errors (and errors SQUASHFS error: Unable to read data cache entry..., SQUASHFS error: Unable to read page, block...) . But when I add "iommu=soft" to kernel parameters, the Live CD boots fine!
Comment 1 mrromanze 2017-06-30 15:00:54 UTC 
More info: 
https://lists.freedesktop.org/archives/amd-gfx/2017-March/006490.html
Comment 2 mrromanze 2017-06-30 16:06:08 UTC 
Similar bug report: https://bugzilla.redhat.com/show_bug.cgi?id=1448121
Comment 3 mrromanze 2017-06-30 16:22:51 UTC 
PATCH that fixes this problem: https://patchwork.freedesktop.org/patch/157327/
Comment 4 mrromanze 2017-06-30 19:42:34 UTC 
Created attachment 1293333 [details]
Patch
Comment 5 Laura Abbott 2018-02-28 03:53:20 UTC 
We apologize for the inconvenience.  There is a large number of bugs to go through and several of them have gone stale. The kernel moves very fast so bugs may get fixed as part of a kernel update. Due to this, we are doing a mass bug update across all of the Fedora 26 kernel bugs.
 
Fedora 26 has now been rebased to 4.15.4-200.fc26.  Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel.
 
If you have moved on to Fedora 27, and are still experiencing this issue, please change the version to Fedora 27.
 
If you experience different issues, please open a new bug report for those.
Comment 6 mrromanze 2018-04-20 12:45:52 UTC 
It has been fixed.