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    SubjectRE: cciss: WARNING/BUG in do_cciss_intr (it's back)
    Jens wrote: 

    >
    > I think it's the same one. The first warning that now triggers is:
    >
    > WARNING: at drivers/block/cciss.c:225
    >
    > which is
    >
    > if (WARN_ON(hlist_unhashed(&c->list)))
    >
    > removeQ(), this is where we would have crashed before due to
    > trying to remove a command from a list it didn't belong to.
    > And then we crash right after in the interrupt handler. So
    > I'm pretty sure this is 100% the same bug.
    >
    > Randy, is this still using kexec? Perhaps cciss needs a
    > better kick-in-the-pants reset on driver load to clear
    > EVERYTHING, there's clearly something very bad happening there.
    >

    I have some code that does a PCI PM reset on the controller. That's one way to ensure the controller gets sane again. Let me port it to 2.6.29-rc and I'll submit the patch.

    Thanks,
    -- mikem

    > >
    > > >
    > > > Booting 2.6.29-rc3-git6 oopsed with:
    > > >
    > > > calling cciss_init+0x0/0x2e [cciss] @ 733 HP CISS Driver
    > (v 3.6.20)
    > > > ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 54 cciss
    > > > 0000:42:08.0: PCI INT A -> Link[LNKA] -> GSI 54 (level, high)
    > > > -> IRQ 54 cciss 0000:42:08.0: irq 56 for MSI/MSI-X IRQ
    > > > 56/cciss0: IRQF_DISABLED is not guaranteed on shared IRQs
    > > > cciss0: <0x3238> at PCI 0000:42:08.0 IRQ 56 using DAC
    > ------------[
    > > > cut here ]------------
    > > > WARNING: at drivers/block/cciss.c:225 do_cciss_intr+0x58f/0x99a
    > > > [cciss]() Hardware name: ProLiant BL685c G1 Modules linked in:
    > > > cciss(+) ehci_hcd ohci_hcd uhci_hcd
    > > > Pid: 0, comm: swapper Not tainted 2.6.29-rc3-git6 #1 Call Trace:
    > > > <IRQ> [<ffffffff8023a741>] warn_slowpath+0xd3/0xf2
    > > > [<ffffffff80243a44>] ? __mod_timer+0xc1/0xd3
    > [<ffffffff8041469f>] ?
    > > > smi_timeout+0xd9/0xe5 [<ffffffff8024f86a>] ?
    > ktime_get_ts+0x49/0x4e
    > > > [<ffffffff804145c6>] ? smi_timeout+0x0/0xe5 [<ffffffffa0024c4b>]
    > > > do_cciss_intr+0x58f/0x99a [cciss] [<ffffffff8026ed21>]
    > > > handle_IRQ_event+0x27/0x57 [<ffffffff8027057d>]
    > > > handle_edge_irq+0xde/0x11f [<ffffffff8020e302>]
    > do_IRQ+0xdc/0x152
    > > > [<ffffffff8020ca13>] ret_from_intr+0x0/0xa <EOI> <4>---[
    > end trace
    > > > a8b437cd48391e28 ]---
    > > > BUG: unable to handle kernel NULL pointer dereference at
    > > > 00000000000000f4
    > > > IP: [<ffffffffa0024c93>] do_cciss_intr+0x5d7/0x99a [cciss] PGD 0
    > > > Oops: 0002 [#1] SMP
    > > > last sysfs file: /sys/block/ram15/dev CPU 2 Modules linked in:
    > > > cciss(+) ehci_hcd ohci_hcd uhci_hcd
    > > > Pid: 0, comm: swapper Tainted: G W 2.6.29-rc3-git6 #1
    > > > RIP: 0010:[<ffffffffa0024c93>] [<ffffffffa0024c93>]
    > > > do_cciss_intr+0x5d7/0x99a [cciss]
    > > > RSP: 0018:ffff88027f12fef0 EFLAGS: 00010046
    > > > RAX: 0000000000000000 RBX: ffff88007f840270 RCX: 0000000000013888
    > > > RDX: 0000000000008080 RSI: 0000000000000046 RDI: 0000000000000009
    > > > RBP: ffff88027f12ff20 R08: 000000447f12fa70 R09: ffff88017e540700
    > > > R10: 0000000000000000 R11: 0000000000000000 R12: ffff88007f8404b0
    > > > R13: ffff88027e1a0000 R14: 0000000000000000 R15: 0000000000000086
    > > > FS: 0000000000680850(0000) GS:ffff88017f121380(0000)
    > > > knlGS:0000000000000000
    > > > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    > > > CR2: 00000000000000f4 CR3: 0000000000201000 CR4: 00000000000006e0
    > > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
    > > > 0000000000000400 Process swapper (pid: 0, threadinfo
    > > > ffff88017f164000, task ffff88017fa5d4c0)
    > > > Stack:
    > > > 0000000000000001 ffff88027f126280 0000000000000000
    > 0000000000000000
    > > > 0000000000000038 0000000000000000 ffff88027f12ff50
    > > > ffffffff8026ed21 ffffffff8076e000 0000000000000038
    > ffff88027f126280
    > > > ffffffff8076e054 Call Trace:
    > > > <IRQ> <0> [<ffffffff8026ed21>] handle_IRQ_event+0x27/0x57
    > > > [<ffffffff8027057d>] handle_edge_irq+0xde/0x11f
    > [<ffffffff8020e302>]
    > > > do_IRQ+0xdc/0x152 [<ffffffff8020ca13>]
    > ret_from_intr+0x0/0xa <EOI>
    > > > <0>Code: 50 08 48 c7 83 40 02 00 00 00 00 00 00 49 c7 44
    > 24 08 00 00
    > > > 00 00 8b 83 34 02 00 00
    > > > 85 c0 0f 85 49 03 00 00 4c 8b b3 50 02 00 00 <41> c7 86
    > f4 00 00 00
    > > > 00 00 00 00 4c 8b 83 28 02 00 00 66 41 8b RIP
    > [<ffffffffa0024c93>]
    > > > do_cciss_intr+0x5d7/0x99a [cciss] RSP <ffff88027f12fef0>
    > > > CR2: 00000000000000f4
    > > > ---[ end trace a8b437cd48391e29 ]--- Kernel panic - not syncing:
    > > > Fatal exception in interrupt
    > > >
    > > >
    > > >
    > > > This is on an HP ProLiant BL685c G1, 4-proc system with
    > > > 8 GB of RAM. (same as previous reports)
    > > >
    > > >
    > > > Rebooting worked successfully.
    > > >
    > > > Thanks,
    > > > --
    > > > ~Randy
    > > >
    > --
    > Jens Axboe
    >
    >

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