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Open Source and information security mailing list archives
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Date: Thu, 04 Sep 2008 09:59:05 -0700 From: Randy Dunlap <randy.dunlap@...cle.com> To: "Miller, Mike (OS Dev)" <Mike.Miller@...com> CC: James Bottomley <James.Bottomley@...senpartnership.com>, lkml <linux-kernel@...r.kernel.org>, scsi <linux-scsi@...r.kernel.org>, akpm <akpm@...ux-foundation.org> Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr Miller, Mike (OS Dev) wrote: > >> -----Original Message----- >> From: James Bottomley [mailto:James.Bottomley@...senPartnership.com] >> Sent: Friday, August 22, 2008 12:02 PM >> To: Randy Dunlap >> Cc: Miller, Mike (OS Dev); lkml; scsi; akpm >> Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr >> >> On Fri, 2008-08-22 at 09:49 -0700, Randy Dunlap wrote: >>> James Bottomley wrote: >>>> On Fri, 2008-08-22 at 15:48 +0000, Miller, Mike (OS Dev) wrote: >>>>>> -----Original Message----- >>>>>> From: Randy Dunlap [mailto:randy.dunlap@...cle.com] >>>>>> Sent: Thursday, August 21, 2008 7:27 PM >>>>>> To: Miller, Mike (OS Dev) >>>>>> Cc: lkml; scsi; akpm >>>>>> Subject: Re: in 2.6.23-rc3-git7 in do_cciss_intr >>>>>> >>>>>> On Thu, 21 Aug 2008 16:25:24 +0000 Miller, Mike (OS Dev) wrote: >>>>>> >>>>>>>>> Randy, >>>>>>>>> We know of a race condition in cciss_init_one. It's fixed >>>>>>>> in 2.6.26 I believe. Here's the patch: >> http://groups.google.com/group/linux.kernel/browse_thread/thread/7 >>>>>> b3 >>>>>>>> 9f >> 2b77622ab03/4f5f45c008655ca1?hl=en&lnk=gst&q=cciss#4f5f45c008655ca >>>>>>>>> 1 >>>>>>>> Mike, >>>>>>>> Sorry, but my fingers have typoed the $subject. My bad. >>>>>>>> Kernel is 2.6.27-rc3-git7 (from above): >>>>>>>> >>>>>>>>>>>> Modules linked in: cciss(+) ehci_hcd ohci_hcd uhci_hcd >>>>>>>>>>>> Pid: 0, comm: swapper Not tainted 2.6.27-rc3-git7 #1 >>>>>>>>>>>> RIP: 0010:[<ffffffffa001bb68>] [<ffffffffa001bb68>] >>>>>>>>>>>> do_cciss_intr+0x627/0xa6c [cciss] >>>>>>> Hmmmmm, let me know what happens from your retest. I'll >>>>>> look at this >>>>>>> as soon as I finish what I'm doing now. We trying to spin >>>>>> for our test >>>>>>> teams but I have something hopelessly broken. :( >>>>>> It didn't BUG in the retest. That just means that it's more >>>>>> difficult to find/fix, right? >>>>> Yup. >>>> Randy, >>>> >>>> If you can't reproduce it, could you use the debug information or >>>> gdb to tell us what line in the source code this: >>>> >>>> do_cciss_intr+0x627 >>>> >>>> corresponds to? That might help isolating the problem. >>> >>> Sure, here's an attempt at that. Please let me know if you want it >>> differently or some other info. >>> (gdb) x/20i do_cciss_intr+0x627 >>> 0x3b68 <do_cciss_intr+1575>: mov %rdx,0x248(%rax) >>> 0x3b6f <do_cciss_intr+1582>: mov 0x248(%rbx),%rdx >>> 0x3b76 <do_cciss_intr+1589>: mov %rax,0x240(%rdx) >>> 0x3b7d <do_cciss_intr+1596>: jmp 0x3b8b <do_cciss_intr+1610> >>> 0x3b7f <do_cciss_intr+1598>: movq $0x0,0x100c0(%r12) >>> 0x3b8b <do_cciss_intr+1610>: mov 0x234(%rbx),%eax >>> 0x3b91 <do_cciss_intr+1616>: test %eax,%eax >>> 0x3b93 <do_cciss_intr+1618>: jne 0x3f27 <do_cciss_intr+2534> >>> 0x3b99 <do_cciss_intr+1624>: mov 0x250(%rbx),%r14 >>> 0x3ba0 <do_cciss_intr+1631>: movl $0x0,0xcc(%r14) >>> 0x3bab <do_cciss_intr+1642>: mov 0x228(%rbx),%r8 >>> 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:206 >> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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