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    SubjectRe: linux-next: Tree for Aug 31 (new arm, arm64, s390 failures)
    Hi Marc,

    On 08/31/2015 09:18 AM, Marc Zyngier wrote:
    > On Mon, 31 Aug 2015 08:47:07 -0700
    > Guenter Roeck <linux@roeck-us.net> wrote:
    >
    >> Hi Marc,
    >>
    >> On 08/31/2015 08:31 AM, Marc Zyngier wrote:
    >>> On Mon, 31 Aug 2015 07:17:36 -0700
    >>> Guenter Roeck <linux@roeck-us.net> wrote:
    >>>
    >>> Hi Guenter,
    >>>
    >>>> Qemu test results:
    >>>> total: 85 pass: 74 fail: 11
    >>>> Failed tests:
    >>>> arm:vexpress-a9:arm_vexpress_defconfig:vexpress-v2p-ca9
    >>>> arm:vexpress-a15:arm_vexpress_defconfig:vexpress-v2p-ca15-tc1
    >>>> arm:vexpress-a9:multi_v7_defconfig:vexpress-v2p-ca9
    >>>> arm:vexpress-a15:multi_v7_defconfig:vexpress-v2p-ca15-tc1
    >>>> arm:realview-pb-a8:arm_realview_pb_defconfig
    >>>> arm:realview-eb:arm_realview_eb_defconfig
    >>>> mips:fuloong2e_defconfig
    >>>> xtensa:dc232b:lx60:xtensa_defconfig
    >>>> xtensa:dc232b:kc705:xtensa_defconfig
    >>>> xtensa:dc233c:ml605:generic_kc705_defconfig
    >>>> xtensa:dc233c:kc705:generic_kc705_defconfi
    >>>>
    >>>> Notable new failures (since next-20150828) are the s390 build failures,
    >>>> the arm64 build failure, and the arm qemu test failures.
    >>>>
    >>>
    >>> [...]
    >>>
    >>>> The qemu arm tests all fail silently, meaning there is no console
    >>>> output. Bisect points to 'irqchip/GIC: Convert to EOImode == 1'.
    >>>> Bisect log attached.
    >>>
    >>> Could you give me a qemu command-line I can use to track this down?
    >>> Real HW seems happy enough, from what I can see...
    >>>
    >>
    >> That is what I was most concerned about :-(. Unfortunately, it
    >> affects many of the most widely used arm qemu emulations, so it
    >> would be very desirable to get this fixed, either in the kernel
    >> or in qemu.
    >>
    >> See https://github.com/groeck/linux-build-test, specifically
    >> https://github.com/groeck/linux-build-test/tree/master/rootfs/arm/.
    >> run-qemu-arm.sh includes the various command lines and configurations.
    >>
    >> Note that some of the tests require a patched version of qemu.
    >> The tests failing above should all work with the latest published
    >> version of qemu (2.4), though.
    >>
    >> Please let me know if there is anything I can do to help tracking
    >> this down.
    >
    > I give it a quick go with qemu 2.1.2 as installed on my laptop, and the
    > results are interesting:
    >
    > - With -next as of today, qemu segfaults. Humpffff.
    >
    > - If I use my branch that contains the EOImode==1 patch, the system
    > boots normally.
    >
    > So there is an interaction between this patch and whatever is in -next
    > at the moment, but that patch on its own is not what triggers the issue.
    >
    Looks like it.

    I did a couple of tests.
    - Revert 'irqchip/GIC: Don't deactivate interrupts forwarded to a guest'.
    Same problem.
    - Revert both 'irqchip/GIC: Don't deactivate interrupts forwarded to a guest'
    and 'irqchip/GIC: Convert to EOImode == 1'.
    Problem is no longer seen.

    There are several other patches in drivers/irqchip/irq-gic.c since 4.2.

    4c2880b31c70 irqchip/gic: Ensure gic_cpu_if_up/down() programs correct GIC instance
    567e5a014848 irqchip/gic: Only allow the primary GIC to set the CPU map
    4b979e4c611c Merge branch 'linus' into irq/core
    0d3f2c92e004 irqchip/gic: Remove redundant gic_set_irqchip_flags
    aec89ef72ba6 irqchip/gic: Enable SKIP_SET_WAKE and MASK_ON_SUSPEND
    5b29264c659c irqchip: Use irq_desc_get_xxx() to avoid redundant lookup of irq_desc
    4d83fcf8d615 irqchip/gic: Consolidate chained IRQ handler install/remove
    41a83e06e2bb irqchip: Prepare for local stub header removal

    Maybe there is an interaction between those and your patch ?

    > I need to build a more recent version of qemu, but the above doesn't
    > fill be with confidence...
    >
    My patched version of qemu 2.4 doesn't crash for me, it simply hangs.
    Not that this is much better.

    Thanks,
    Guenter



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