Bug 219889

Summary:	Update to 'kernel-lt.x86_64-6.1.130-1.el9.elrepo' causes start failure in the VM with vfio passthrough
Product:	Linux	Reporter:	bugzilla.kernel.org
Component:	Kernel	Assignee:	Virtual assignee for kernel bugs (linux-kernel)
Status:	NEW ---
Severity:	high	CC:	bugzilla.kernel.org, toracat
Priority:	P3
Hardware:	Intel
OS:	Linux
Kernel Version:		Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	grub.cfg VM config Successful start on 6.1.129 Error on 6.1.130 Error on 6.1.131 Ok in 6.13.6 Ok in 6.13.7 6.1.132 6.14.0

Description bugzilla.kernel.org 2025-03-17 04:47:49 UTC

There is an issue in the kernels 6.1.130 & 6.1.131, while in 6.13.6 & 6.13.7 it works ok.

Cannot start VM with error

2025-03-08T14:53:10.620302Z qemu-kvm: VFIO_MAP_DMA failed: Cannot allocate memory
2025-03-08T14:53:10.620323Z qemu-kvm: vfio_container_dma_map(0x5621ca6e5400, 0xc0000, 0x20000, 0x7fd550600000) = -12 (Cannot allocate memory)
qemu: hardware error: vfio: DMA mapping failed, unable to continue


Config & logs are in the attachment.

Comment 1 bugzilla.kernel.org 2025-03-17 04:49:23 UTC

Created attachment 307842 [details]
grub.cfg

Comment 2 bugzilla.kernel.org 2025-03-17 04:49:43 UTC

Created attachment 307843 [details]
VM config

Comment 3 bugzilla.kernel.org 2025-03-17 04:50:36 UTC

Created attachment 307844 [details]
Successful start on 6.1.129

Comment 4 bugzilla.kernel.org 2025-03-17 04:51:12 UTC

Created attachment 307845 [details]
Error on 6.1.130

Comment 5 bugzilla.kernel.org 2025-03-17 04:51:29 UTC

Created attachment 307846 [details]
Error on 6.1.131

Comment 6 bugzilla.kernel.org 2025-03-17 04:51:56 UTC

Created attachment 307847 [details]
Ok in 6.13.6

Comment 7 bugzilla.kernel.org 2025-03-17 04:52:11 UTC

Created attachment 307848 [details]
Ok in 6.13.7

Comment 8 bugzilla.kernel.org 2025-03-29 04:10:00 UTC

There is the same bug in 6.1.132 and it's ok in 6.14.0.

Comment 9 bugzilla.kernel.org 2025-03-29 04:10:48 UTC

Created attachment 307905 [details]
6.1.132

Comment 10 bugzilla.kernel.org 2025-03-29 04:11:09 UTC

Created attachment 307906 [details]
6.14.0

Comment 11 Akemi Yagi 2025-03-30 17:12:56 UTC

Just wanted to add a note that elrepo does not make modifications to the source code from kernel.org. Chances are this is a bug in linux-6.1.130. 

The mainline kernels do not show any problem. Assuming that some backport caused the issue, there might be additional patches that should have been applied together.