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    SubjectRe: Possible regression: MSI vector leakage since 2.6.18-rc5ish (Unable to repeatedly allocate/free MSI interrupt)

    Auke Kok wrote:
    > Hi,
    > I've established a regression in the MSI vector/irq allocation routine for both
    > i386 and x86_64. Our test labs repeatedly modprobe/rmmod the e1000 driver for
    > serveral minutes which allocates msi vectors and frees them. These tests have
    > been running fine until 2.6.19.
    > git-bisecting I've established that in between commit
    > 04b9267b15206fc902a18de1f78de6c82ca47716 "Eric W. Biederman -- genirq: x86_64
    > irq: Remove the msi assumption that irq == vector" and commit
    > f29bd1ba68c8c6a0f50bd678bbd5a26674018f7c "Ingo Molnar -- genirq: convert the
    > x86_64 architecture to irq-chips" the behaviour broke.
    > The revisions in between seem to be dependent and give all sorts of other
    > issues, so it's rather hard for me to bisect that and give trustworthy results.
    > the e1000 driver hits the 256-mark cycle (I think - it consistently refuses to
    > do 500 msi irq/vector allocations which is my test case) and throws:
    > e1000: eth4: e1000_request_irq: Unable to allocate MSI interrupt Error: -16
    > which is caused by a `if ((err = pci_enable_msi(adapter->pdev))) {` call from
    > the e1000 driver. It's rather easy to hit this mark with the new 4-port e1000
    > adapters :).
    > as for the e1000 code, I can say that even our oldest msi-enabled e1000 driver
    > works fine with 2.6.18 and under. All kernels from 2.6.19 fail consistently.
    > I mostly suspect commit 7bd007e480672c99d8656c7b7b12ef0549432c37 at the moment.
    > Perhaps Eric Biederman can help?

    PS PS

    The exact same problem exists when doing "for n in `seq 1 300` ; do modprobe
    snd_hda_intel enable_msi ; rmmod snd_hda_intel ; done".

    I'm sure it will show up for other msi enabled devices.
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      Last update: 2007-01-26 23:53    [W:0.033 / U:4.816 seconds]
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