Messages in this thread Patch in this message | | | From | Marshall Midden <> | Date | Wed, 27 Oct 2021 12:21:30 -0500 | Subject | Re: v5.15-rc7 AMD no kernel dump, spews "scsi_dma_map failed: request for 36 bytes!" |
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Yes, the spewing of messages stopped. Kernel crash dump taking is now occurring. Patch applied to v5.15-rc7. Reworded: THANKS! Patch works!
Dunno why the dmesg isn't right, but at least there is a core image! [I updated makedumpfs for v5.15-rc4 -- applying a bunch of cifs/smb, qlogic, etc. patches and was getting ready for new kernel release in a few weeks -- couldn't debug a cifs crash. :) Down the rabbit hole... ;) ] Intel machine booted, etc. and it has a dmesg correct. *sigh* I don't think "I" need to worry about that. Someone else can report it.
/media/parsecdata/crash/127.0.0.1-2021-10-27-12:06:53: total 5283408 -rw------- 1 root root 5410206160 Oct 27 12:06 vmcore -rw-r--r-- 1 root root 0 Oct 27 12:06 vmcore-dmesg-incomplete.txt
On Wed, Oct 27, 2021 at 11:41 AM Logan Gunthorpe <logang@deltatee.com> wrote: > > Hi, > > On 2021-10-27 10:08 a.m., Marshall Midden wrote: > > v5.15-rc7 AMD no kernel dump, spews "scsi_dma_map failed: request for 36 bytes!" > > > > With v5.15-rc (1 through 7), AMD processor kernel crash dumps do not occur, > > instead spews: > > "scsci_dma_map failed: request for 36 bytes!" > > Works on Intel machines, and in v5.14.0 (and v5.14.14) - as well as previous > > kernels (down to v5.3.x.) > > git bisect torvalds repository shows: dabb16f67215918c48cf3ff1fc4bc36ca421da2b > > Reverse patch to tag v5.15-rc7 allows kernel crash dumps to occur/happen. > > > > On careful review I think I see what might be causing this. Can you > please try the following patch? > > Thanks, > > Logan > > -- > > diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c > index cd0f1a593997..3bfb5da87802 100644 > --- a/drivers/iommu/dma-iommu.c > +++ b/drivers/iommu/dma-iommu.c > @@ -1028,7 +1028,8 @@ static int iommu_dma_map_sg(struct device *dev, > struct sc> > > if (static_branch_unlikely(&iommu_deferred_attach_enabled)) { > ret = iommu_deferred_attach(dev, domain); > - goto out; > + if (ret) > + goto out; > } > > if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
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