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    SubjectRe: [3.1-rc4] Bus Fatal Error caused by "PCI: Set PCI-E Max Payload Size on fabric"
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    On Wed, Sep 7, 2011 at 1:47 PM, Simon Kirby <sim@hostway.ca> wrote:
    > On Wed, Sep 07, 2011 at 12:18:59PM -0700, Simon Kirby wrote:
    >
    >> On Wed, Sep 07, 2011 at 10:44:32AM -0700, Jesse Barnes wrote:
    >>
    >> > On Wed, 7 Sep 2011 12:52:25 -0400
    >> > Josh Boyer <jwboyer@gmail.com> wrote:
    >> >
    >> > > On Wed, Sep 7, 2011 at 12:22 PM, Sven Schnelle <svens@stackframe.org>
    >> > > wrote:
    >> > > > Simon Kirby <sim@hostway.ca> writes:
    >> > > >
    >> > > >> Hello!
    >> > > >>
    >> > > >> Since trying 3.1-rc4 on a few Dell servers, all of them have
    >> > > >> booted up with the amber error LED lit. "ipmitool sel list" shows:
    >> > > >>
    >> > > >> ?? ??1 | 09/06/2011 | 17:21:56 | Event Logging Disabled #0x72 | Log
    >> > > >> area reset/cleared | Asserted 2 | 09/06/2011 | 17:25:38 | Critical
    >> > > >> Interrupt #0x18 | Bus Fatal Error | Asserted 3 | 09/06/2011 |
    >> > > >> 17:25:38 | Unknown #0x1a | 4 | 09/06/2011 | 17:25:38 | Unknown
    >> > > >> #0x1a |
    >> > > >
    >> > > > I'm seeing exact the same issue on a Dell 1950 Server. If anyone
    >> > > > wants me to try additional debugging/patches, feel free to do
    >> > > > so. Unfortunately i don't have the time/knowledge to debug that by
    >> > > > myself.
    >> > >
    >> > > I thought Jesse or Jon had a revert or partial fix queued up to send
    >> > > to Linus, but I don't see anything in or post -rc5 yet.  That was
    >> > > indicated in https://bugzilla.kernel.org/show_bug.cgi?id=42162
    >> > >
    >> > > Jesse, Jon?
    >> >
    >> > kernel.org is still down and I haven't pushed anything to github.  I
    >> > asked Jon to send his patch directly to Linus today instead.
    >>
    >> FWIW, this patch didn't seem to fix it:
    >> https://bugzilla.kernel.org/attachment.cgi?id=71222
    >>
    >> dmesg used to say:
    >>
    >> pci 0000:00:02.0: Dev MPS 128 MPSS 256 MRRS 128
    >> pci 0000:00:02.0: Dev MPS 256 MPSS 256 MRRS 128
    >> pci 0000:06:00.0: Dev MPS 128 MPSS 256 MRRS 4096
    >> pci 0000:06:00.0: Dev MPS 256 MPSS 256 MRRS 128
    >> pci 0000:07:00.0: Dev MPS 128 MPSS 256 MRRS 4096
    >> pci 0000:07:00.0: Dev MPS 256 MPSS 256 MRRS 128
    >> pci 0000:08:00.0: Dev MPS 128 MPSS 128 MRRS 128
    >> pci 0000:08:00.0: MPS configured higher than maximum supported by the device.  If a bus issue occurs, try running with pci=pcie_bus_safe.
    >> pci 0000:08:00.0: Dev MPS 256 MPSS 256 MRRS 128
    >> Uhhuh. NMI received for unknown reason 21 on CPU 0.
    >> Do you have a strange power saving mode enabled?
    >> Dazed and confused, but trying to continue
    >
    > Ok, I commented out the "pcie_write_mps(dev, mps);" line and the error
    > stopped, but this made me realize that the pci=pcie_bus_safe option must
    > have been missing. It turns out I had hacked a custom grub entry to load
    > the newest kernel into grub instead of the one with the highest version
    > number (grumble), so the default kopt didn't apply there.
    >
    > So, pci=pcie_bus_safe DOES fix this case, and I've confirmed that the
    > MRRS-dissabling patch makes no difference in this case.
    >
    > Can we just make pci=pcie_bus_safe (as in previous behavior) the default,
    > or make it not change where it would otherwise warn, or does that
    > basically make the thing useless?

    I have a patch that does does pcie_bus_safe as the default behavior
    and does not modify the MRRS. Would you be willing to test this patch
    for me?

    Thanks,
    Jon

    >
    > Simon-
    >
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