Linux-stable-mirror March 2025

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[6.1.y] Regression from b1e6e80a1b42 ("xen/swiotlb: add alignment check for dma buffers") when booting with Xen and mpt3sas_cm0 _scsih_probe failures

by Salvatore Bonaccorso

Hi Juergen, hi all, Radoslav Bodó reported in Debian an issue after updating our kernel from 6.1.112 to 6.1.115. His report in full is at: https://bugs.debian.org/1088159 He reports that after switching to 6.1.115 (and present in any of the later 6.1.y series) booting under xen, the mptsas devices are not anymore accessible, the boot shows: mpt3sas version 43.100.00.00 loaded mpt3sas_cm0: 63 BIT PCI BUS DMA ADDRESSING SUPPORTED, total mem (8086116 kB) mpt3sas_cm0: CurrentHostPageSize is 0: Setting default host page size to 4k mpt3sas_cm0: MSI-X vectors supported: 96 mpt3sas_cm0: 0 40 40 mpt3sas_cm0: High IOPs queues : disabled mpt3sas0-msix0: PCI-MSI-X enabled: IRQ 447 mpt3sas0-msix1: PCI-MSI-X enabled: IRQ 448 mpt3sas0-msix2: PCI-MSI-X enabled: IRQ 449 mpt3sas0-msix3: PCI-MSI-X enabled: IRQ 450 mpt3sas0-msix4: PCI-MSI-X enabled: IRQ 451 mpt3sas0-msix5: PCI-MSI-X enabled: IRQ 452 mpt3sas0-msix6: PCI-MSI-X enabled: IRQ 453 mpt3sas0-msix7: PCI-MSI-X enabled: IRQ 454 mpt3sas0-msix8: PCI-MSI-X enabled: IRQ 455 mpt3sas0-msix9: PCI-MSI-X enabled: IRQ 456 mpt3sas0-msix10: PCI-MSI-X enabled: IRQ 457 mpt3sas0-msix11: PCI-MSI-X enabled: IRQ 458 mpt3sas0-msix12: PCI-MSI-X enabled: IRQ 459 mpt3sas0-msix13: PCI-MSI-X enabled: IRQ 460 mpt3sas0-msix14: PCI-MSI-X enabled: IRQ 461 mpt3sas0-msix15: PCI-MSI-X enabled: IRQ 462 mpt3sas0-msix16: PCI-MSI-X enabled: IRQ 463 mpt3sas0-msix17: PCI-MSI-X enabled: IRQ 464 mpt3sas0-msix18: PCI-MSI-X enabled: IRQ 465 mpt3sas0-msix19: PCI-MSI-X enabled: IRQ 466 mpt3sas0-msix20: PCI-MSI-X enabled: IRQ 467 mpt3sas0-msix21: PCI-MSI-X enabled: IRQ 468 mpt3sas0-msix22: PCI-MSI-X enabled: IRQ 469 mpt3sas0-msix23: PCI-MSI-X enabled: IRQ 470 mpt3sas0-msix24: PCI-MSI-X enabled: IRQ 471 mpt3sas0-msix25: PCI-MSI-X enabled: IRQ 472 mpt3sas0-msix26: PCI-MSI-X enabled: IRQ 473 mpt3sas0-msix27: PCI-MSI-X enabled: IRQ 474 mpt3sas0-msix28: PCI-MSI-X enabled: IRQ 475 mpt3sas0-msix29: PCI-MSI-X enabled: IRQ 476 mpt3sas0-msix30: PCI-MSI-X enabled: IRQ 477 mpt3sas0-msix31: PCI-MSI-X enabled: IRQ 478 mpt3sas0-msix32: PCI-MSI-X enabled: IRQ 479 mpt3sas0-msix33: PCI-MSI-X enabled: IRQ 480 mpt3sas0-msix34: PCI-MSI-X enabled: IRQ 481 mpt3sas0-msix35: PCI-MSI-X enabled: IRQ 482 mpt3sas0-msix36: PCI-MSI-X enabled: IRQ 483 mpt3sas0-msix37: PCI-MSI-X enabled: IRQ 484 mpt3sas0-msix38: PCI-MSI-X enabled: IRQ 485 mpt3sas0-msix39: PCI-MSI-X enabled: IRQ 486 mpt3sas_cm0: iomem(0x00000000ac400000), mapped(0x00000000d9f45f61), size(65536) mpt3sas_cm0: ioport(0x0000000000006000), size(256) mpt3sas_cm0: CurrentHostPageSize is 0: Setting default host page size to 4k mpt3sas_cm0: scatter gather: sge_in_main_msg(1), sge_per_chain(7), sge_per_io(128), chains_per_io(19) mpt3sas_cm0: failure at drivers/scsi/mpt3sas/mpt3sas_scsih.c:12348/_scsih_probe()! We were able to bissect the changes (see https://bugs.debian.org/1088159#64) down to b1e6e80a1b42 ("xen/swiotlb: add alignment check for dma buffers") #regzbot introduced: b1e6e80a1b42 #regzbot link: https://bugs.debian.org/1088159 reverting the commit resolves the issue. Does that ring some bells? In fact we have two more bugs reported with similar symptoms but not yet confirmed they are the same, but I'm referencing them here as well in case we are able to cross-match to root cause: https://bugs.debian.org/1093371 (megaraid_sas didn't work anymore with Xen) and https://bugs.debian.org/1087807 (Unable to boot: i40e swiotlb buffer is full) (but again the these are yet not confirmed to have the same root cause). Thanks in advance, Regards, Salvatore

4 months, 2 weeks

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Linux-stable-mirror March 2025