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Date: Sun, 09 Mar 2008 18:42:31 +0300 From: Michael Tokarev <mjt@....msk.ru> To: James Bottomley <James.Bottomley@...senPartnership.com> CC: FUJITA Tomonori <tomof@....org>, linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org, fujita.tomonori@....ntt.co.jp Subject: Re: kernel BUG at drivers/scsi/aic7xxx/aic79xx_osm.c:1490! Michael Tokarev wrote: > James Bottomley wrote: >> On Sun, 2008-03-09 at 21:29 +0900, FUJITA Tomonori wrote: >>> On Sun, 09 Mar 2008 14:23:13 +0300 >>> Michael Tokarev <mjt@....msk.ru> wrote: >>> >>>> Just got quite.. bad situation on a production server >>>> here. The machine locked up hard several times in a >>>> row (required hard reboot). So I finally enabled watchdog >>>> subsystem which helped. >>>> >>>> Now I see the following (over netconsole): >>>> >>>> DMA: Out of SW-IOMMU space for 65536 bytes at device 0000:08:07.0 >>>> ------------[ cut here ]------------ >>>> kernel BUG at drivers/scsi/aic7xxx/aic79xx_osm.c:1490! >>> Seems that you was out of swiommu space (and aic79xx can't handle it >>> though it should). This happened because: >>> >>> a) you produced more I/Os than swiommu can handle. >>> >>> b) swiommu space leaks due to bugs. >>> >>> If you hit this problem due to a), the following boot option might >>> help: >>> >>> swiotlb=65536 > > Running with this parameter now - no lockups so far. > >> Actually, it's worse than this. The aic79xx is a fully 64 bit capable >> PCI card, it shouldn't be using the iommu at all. However, it has three >> DMA modes: 64 bit, 39 bit and 32 bit; with a corresponding resource >> cost increasing with the number of bits. It employs special APIs to >> size the masks according to the memory, in aic79xx_osm_pci.c: > [] >> Could you firstly tell me how much memory you have, and secondly >> instrument this code with the patch below to see if we can work out what >> it's doing? > > The memory map is below (6Gb total). The patch - kernel is being compiled > right now. And here's the result (without swiotlb=65536): DEBUG: RETURNED REQUIRED MASK ffffffff DEBUG: SET 32 BIT ADDRESSING (which doesn't look like a good thing, provided this machine has 6Gb of memory...) It just crashed again, with the same message - in a few seconds after I mounted the filesystem in question. So back to swiotlb=65536 ;) > Linux version 2.6.24-x86-64 (mjt@...tus.tls.msk.ru) (gcc version 4.2.3 > 20071123 (prerelease) (Debian 4.2.2-4)) #2.6.24.2 SMP Mon Feb 18 > 16:04:41 MSK 2008 > Command line: auto BOOT_IMAGE=linux-test ro root=100 swiotlb=65536 > panic=30 elevator=deadline > BIOS-provided physical RAM map: > BIOS-e820: 0000000000000000 - 000000000009dc00 (usable) > BIOS-e820: 000000000009dc00 - 00000000000a0000 (reserved) > BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) > BIOS-e820: 0000000000100000 - 00000000cfffca00 (usable) > BIOS-e820: 00000000cfffca00 - 00000000d0000000 (ACPI data) > BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) > BIOS-e820: 00000000fec00000 - 0000000100000000 (reserved) > BIOS-e820: 0000000100000000 - 00000001b0000000 (usable) > > > /mjt > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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