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    SubjectRe: WARNING and PANIC in irq_matrix_free
    Adding Broadcom developers to the thread.

    Hi Michael, Vasundhara, and Andy,

    Could you please help look into the case I found? ethtool crashes the system
    for both net/master and net-next/master.

    Thanks,
    Song

    On Fri, May 25, 2018 at 1:10 PM, Song Liu <liu.song.a23@gmail.com> wrote:
    > Hi,
    >
    > We are seeing something probably related.
    >
    > We run ethtool on a system with Broadcom NIC to increase number of
    > combined queues.
    >
    >
    > [root@ ~]# ethtool -l eth0
    > Channel parameters for eth0:
    > Pre-set maximums:
    > RX: 9
    > TX: 8
    > Other: 0
    > Combined: 17
    > Current hardware settings:
    > RX: 0
    > TX: 0
    > Other: 0
    > Combined: 8
    >
    > [root@ ~]# ethtool -L eth0 combined 16
    >
    > The last command PANIC the kernel easily (5 out of 5 in my tests).
    >
    > I haven't got luck to catch much console output, the only line I got is:
    >
    > [ 504.727865] WARNING: CPU: 10 PID: 0 at kernel/irq/matrix.c:371
    > irq_matrix_free+0x32/0xd0
    >
    > The NIC we have is
    >
    > Broadcom Limited BCM57302 NetXtreme-C 10Gb/25Gb Ethernet Controller
    >
    > Thanks,
    > Song
    >
    > On Wed, May 23, 2018 at 1:49 AM, Thomas Gleixner <tglx@linutronix.de> wrote:
    >> On Wed, 23 May 2018, Tariq Toukan wrote:
    >>> On 19/05/2018 2:20 PM, Thomas Gleixner wrote:
    >>> > On Fri, 18 May 2018, Dmitry Safonov wrote:
    >>> > > I'm not entirely sure that it's the same fault, but at least backtrace
    >>> > > looks resembling.
    >>> >
    >>> > Yes, it's similar, but not the same issue. I'll stare are the code ...
    >>> >
    >>> > Thanks,
    >>> >
    >>> > tglx
    >>> >
    >>>
    >>> We still see the issue in our daily regression runs.
    >>> I have your patch merged into my internal branch, it prints the following:
    >>>
    >>> [ 4898.226258] Trying to clear prev_vector: 0
    >>> [ 4898.226439] Trying to clear prev_vector: 0
    >>>
    >>> i.e. vector(0) is lower than FIRST_EXTERNAL_VECTOR.
    >>
    >> Could you please enable the vector and irq matrix trace points and capture
    >> the trace when this happens?
    >>
    >> Thanks,
    >>
    >> tglx
    >>

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