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Date: Mon, 04 Oct 2010 15:07:27 +0200 From: Zdenek Kabelac <zkabelac@...hat.com> To: chich21@...l.com CC: linux-kernel@...r.kernel.org, stable@...nel.org Subject: Re: Linux kernel 2.6.34.7 lvm error Dne 4.10.2010 10:46, Zdenek Kabelac napsal(a): > Dne 3.10.2010 11:56, chich21@...l.com napsal(a): >> With Linux kernel 2.6.34.7 from www.kernel.org the following error occurs. >> >> Issuing this command produces error. >> >> vgchange -ay >> >> outputs: >> Internal error: Maps lock 14317216 < unlock 14321312 >> >> vgchange is part of lvm-tools. >> >> This doesn't happen with kernel 2.6.34 or 2.6.34.1 from www.kernel.org. >> >> Is there a patch for 2.6.34.x series coming for this error. As there is one >> for 2.6.35.x series. >> >> Please CC email me related posts. > > > Bug is related to stack guard fix - kernel 2.6.36-rc4 has this problem fixed. > Bug is present in 2.6.36-rc3 - so something between them fixes the problem. > > It looks like the [stack] mapping loses 1 page after each mlock/munlock cycle. > I'm probably going to play bisect game to find out missing fix. > > https://bugzilla.redhat.com/show_bug.cgi?id=638525 > So - after bisecting - it seems that commit: 39aa3cb3e8250db9188a6f1e3fb62ffa1a717678 "mm: Move vma_stack_continue into mm.h" by Stefan had a nice 'bug-fixing' side effect which have not been mentioned in its description - it fixes misbehaving of mlock/munlock [stack] mapping size. So I assume this commit should be backported to stable kernels as well when there is stack-guard patch already added. Cc: stable@ Zdenek -- 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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