linux-kernel - Re: in 2.6.23-rc3-git7 in do_cciss

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Message-ID: <4923237B.9090707@xenotime.net>
Date:	Tue, 18 Nov 2008 12:20:11 -0800
From:	Randy Dunlap <rdunlap@...otime.net>
To:	scsi <linux-scsi@...r.kernel.org>
CC:	"Miller, Mike (OS Dev)" <Mike.Miller@...com>,
	Jens Axboe <jens.axboe@...cle.com>,
	James Bottomley <James.Bottomley@...senpartnership.com>,
	lkml <linux-kernel@...r.kernel.org>,
	akpm <akpm@...ux-foundation.org>
Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr

Randy Dunlap wrote:
> Miller, Mike (OS Dev) wrote:
>>> -----Original Message-----
>>> From: Randy Dunlap [mailto:randy.dunlap@...cle.com]
>>> Sent: Thursday, September 25, 2008 3:40 PM
>>> To: scsi
>>> Cc: Jens Axboe; Miller, Mike (OS Dev); James Bottomley; lkml; akpm
>>> Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr
>>>
>>> On Thu, 25 Sep 2008 13:33:07 -0700 Randy Dunlap wrote:
>>>
>>>> Jens Axboe wrote:
>>>>> On Thu, Sep 04 2008, Miller, Mike (OS Dev) wrote:
>>>>>>>>>> 0x3bb2 <do_cciss_intr+1649>:    mov    0x2(%r8),%dx
>>>>>>>>>> 0x3bb7 <do_cciss_intr+1654>:    test   %dx,%dx
>>>>>>>>>> 0x3bba <do_cciss_intr+1657>:    je     0x3f0e
>>> <do_cciss_intr+2509>
>>>>>>>>>> $ addr2line -e cciss.o -f  do_cciss_intr+0x627 SA5_fifo_full
>>>>>>>>>>
>>> /home/rdunlap/linsrc/linux-2.6.27-rc3-git7/drivers/block/cciss.h:2
>>>>>>> 06
>>>>>>>>> OK ...that's confusing.  It seems to be saying that
>>> ctrlr_info_t
>>>>>>>>> * was NULL.  However, I can't see a way of getting into the
>>>>>>> fifo_full
>>>>>>>>> callback from do_cciss_intr ..
>>>>>>>>> especially not with an NULL host.
>>>>>>>>>
>>>>>>>>> James
>>>>>>>> That is weird. Even if we could get there fifo_full doesn't
>>>>>>> do anything but wait for a bit.
>>>>>>>
>>>>>>> Hi,
>>>>>>>
>>>>>>> This just happened again.  This time it's on 2.6.27-rc5-git3.
>>>>>>>
>>>>>>> ~Randy
>>>>>> Thanks Randy. I think. :)
>>>>>>
>>>>>> I'll try to recreate in my lab.
>>>>> This looks somewhat strange, mostly like 'c' is NULL and it's
>>>>> oopsing in in removeQ (I don't think Randy's analysis is
>>> correct in
>>>>> assuming it's 'h' and it's in fifo_full). Given that 'c'
>>> cannot be
>>>>> NULL, it's c->prev or c->next that are NULL.
> 
> This BUG: has happened (now) 5 times today.  Higher frequency than usual for
> some reason.
> 
> I enabled CCISS_DEBUG and added one printk in removeQ().  On the first call

s/first/second/


> to removeQ(), both c->next and c->prev are NULL.
> 
> Here's the kernel log output from cciss:
> 
> cciss 0000:42:08.0: PCI INT A -> Link[LNKA] -> GSI 54 (level, high) -> IRQ 54
> command = 147
> irq = 36
> board_id = 3211103c
> cciss 0000:42:08.0: irq 87 for MSI/MSI-X
> address 0 = fdf80000
> cfg base address = 10
> cfg base address index = 0
> cfg offset = 400
> Controller Configuration information
> ------------------------------------
>    Signature = CISS
>    Spec Number = 1
>    Transport methods supported = 0x6
>    Transport methods active = 0x3
>    Requested transport Method = 0x0
>    Coalesce Interrupt Delay = 0x0
>    Coalesce Interrupt Count = 0x1
>    Max outstanding commands = 0x256
>    Bus Types = 0x200000
>    Server Name =
>    Heartbeat Counter = 0xffc
> 
> 
> Trying to put board into Simple mode
> I counter got to 1 0
> Controller Configuration information
> ------------------------------------
>    Signature = CISS
>    Spec Number = 1
>    Transport methods supported = 0x6
>    Transport methods active = 0x3
>    Requested transport Method = 0x0
>    Coalesce Interrupt Delay = 0x0
>    Coalesce Interrupt Count = 0x1
>    Max outstanding commands = 0x256
>    Bus Types = 0x200000
>    Server Name =
>    Heartbeat Counter = 0xffc
> 
> cciss0: <0x3238> at PCI 0000:42:08.0 IRQ 87 using DAC
> cciss: intr_pending 8
> cciss: removeQ: Qptr=ffff88027e7500b8, c=ffff88007f83e000, next=ffff88007f83e000, prev=ffff88007f83e000
> Sending 7f83e000 - down to controller
> cciss: intr_pending 8
> cciss:  Read 4 back from board
> cciss: removeQ: Qptr=ffff88027e7500c0, c=ffff88007f840000, next=0000000000000000, prev=0000000000000000
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000248
> IP: [<ffffffffa002502b>] do_cciss_intr+0x6c8/0xb10 [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 Not tainted 2.6.28-rc5 #1
> RIP: 0010:[<ffffffffa002502b>]  [<ffffffffa002502b>] do_cciss_intr+0x6c8/0xb10 [cciss]
> RSP: 0018:ffff88017fa9fee8  EFLAGS: 00010087
> RAX: 0000000000000000 RBX: ffff88007f840000 RCX: 000000000000a3d9
> RDX: 0000000000000000 RSI: 0000000000000046 RDI: ffffffff8080e634
> RBP: ffff88017fa9ff18 R08: 0000000000000000 R09: ffff88017e918800
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff88027e740000
> R13: 0000000000000000 R14: 0000000000000057 R15: 0000000000000086
> FS:  00000000008558f0(0000) GS:ffff88017fc01c80(0000) knlGS:0000000000000000
> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> CR2: 0000000000000248 CR3: 0000000000201000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process swapper (pid: 0, threadinfo ffff88027f660000, task ffff88027f635400)
> Stack:
>  0000000000000030 ffff88017ea73640 0000000000000000 0000000000000000
>  0000000000000057 0000000000000000 ffff88017fa9ff48 ffffffff8026a8b9
>  ffffffff8074ab00 0000000000000057 ffff88017ea73640 ffffffff8074ab58
> Call Trace:
>  <IRQ> <0> [<ffffffff8026a8b9>] handle_IRQ_event+0x27/0x57
>  [<ffffffff8026c424>] handle_edge_irq+0xde/0x11f
>  [<ffffffff8020e29b>] do_IRQ+0xfc/0x175
>  [<ffffffff8020c3e6>] ret_from_intr+0x0/0xa
>  <EOI> <0> [<ffffffff8023c7d2>] ? ksoftirqd+0x0/0xa6
>  [<ffffffff80212575>] ? default_idle+0x2b/0x40
>  [<ffffffff80212799>] ? c1e_idle+0xe5/0xec
>  [<ffffffff8056a7f6>] ? atomic_notifier_call_chain+0xf/0x11
>  [<ffffffff8020acd1>] ? cpu_idle+0x40/0x5e
>  [<ffffffff8056284e>] ? start_secondary+0x174/0x179
> Code: 8b 83 48 02 00 00 48 39 d8 74 37 49 39 9c 24 c0 00 01 00 75 08 49 89 84 24 c0 00 01 00 48 8b 83 40 02 00 00 48 8b 93 48 02 00 00 <48> 89 90 48 02 00 00 48 8b 93 48 02 00 00 48 89 82 40 02 00 00
> RIP  [<ffffffffa002502b>] do_cciss_intr+0x6c8/0xb10 [cciss]
>  RSP <ffff88017fa9fee8>
> CR2: 0000000000000248
> Kernel panic - not syncing: Fatal exception in interrupt
> 
> 
> Any ideas/suggestions?

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