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Message-ID: <20100425091759.GA9993@redhat.com> Date: Sun, 25 Apr 2010 12:18:00 +0300 From: "Michael S. Tsirkin" <mst@...hat.com> To: Robert Wimmer <kernel@...ceti.net> Cc: Avi Kivity <avi@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, bugzilla-daemon@...zilla.kernel.org, Rusty Russell <rusty@...tcorp.com.au>, Mel Gorman <mel@....ul.ie>, Trond Myklebust <Trond.Myklebust@...app.com>, linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [Bugme-new] [Bug 15709] New: swapper page allocation failure On Fri, Apr 23, 2010 at 07:26:52AM +0200, Robert Wimmer wrote: > > I'm not sure why the lockup backtrace does not show function names - > > is the kernel stripped? > > I'm building the kernels always with "genkernel" a Gentoo > helper programm for kernel building. But I've looked into > the log file of genkernel and there is nothing mentioned about > striping the kernel. There will be a future release of genkernel > which supports this but this is currently not the case. Since > I haven't stripped the kernel I would answer no. Maybe a > kernel option which should be enabled? > > Thanks! > Robert > Hmm. I have these CONFIG_KALLSYMS=y CONFIG_KALLSYMS_ALL=y CONFIG_KALLSYMS_EXTRA_PASS=y # CONFIG_STRIP_ASM_SYMS is not set > > > On 04/22/10 12:03, Michael S. Tsirkin wrote: > > On Thu, Apr 22, 2010 at 01:31:06PM +0200, kernel wrote: > > > >> Maybe some comments to my former mail about what I've done: > >> I started with a fresh clone (deleted the old /usr/src/linux > >> of course). > >> > >> git clone > >> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git linux > >> > >> Then I started bisect > >> > >> git bisect start 'v2.6.31' 'v2.6.30' > >> > >> and build the first kernel and then marked kernels which > >> "crashed" with "soft lockup" or "swapper page allocation failure" > >> as bad and the other ones as good. Before I've compiled > >> a new kernel I've always done a "make mrproper". I don't know > >> if this is needed but thought it wouldn't hurt. > >> > >> For me it was not clear that maybe I should have had stopped > >> testing after the first commit that came up with a "swapper > >> page allocation failure". It was only one commit which cased > >> the allocation failure. All the other commits marked as bad > >> came up with a soft lockup. But I thought it is important to > >> find the earliest commit which crashes. So should I find out > >> the commit with the allocation failure? > >> > > I think you did the right thing. We'll have to > > figure out soft lockup thing, then if page allocation failure > > turns out to be a different issue, look at it. > > > > > >> As you requested I've now done now a > >> > >> git checkout c02d7adf8c5429727a98bad1d039bccad4c61c50 > >> > >> which ended with a soft lockup within 3 min. after starting > >> the VM (see > >> https://bugzilla.kernel.org/attachment.cgi?id=26089&action=edit) > >> with this kernel. > >> > > I'm not sure why the lockup backtrace does not show function names - > > is the kernel stripped? > > > > > >> Then I've done a > >> > >> git checkout cf8d2c11cb77f129675478792122f50827e5b0ae > >> > >> compiled and restarted the VM with this kernel version > >> (BTW: Of course I've always used the same .config for > >> all kernels I've build.). cf8d2c11cb77f129675478792122f50827e5b0ae > >> is running fine. > >> > >> Thanks! > >> Robert > >> > > Well, so the soft lockup issue seems NFS-related? > > Trond, commit cf8d2c11cb77f129675478792122f50827e5b0ae seems to > > be causing problems on some old kernels (See bisect below). Any idea why? > > > > > > > >> On Wed, 21 Apr 2010 12:42:49 +0300, "Michael S. Tsirkin" <mst@...hat.com> > >> wrote: > >> > >>> On Wed, Apr 21, 2010 at 01:23:12PM +0200, kernel wrote: > >>> > >>>> So after the compiler was running hot I've now the following result: > >>>> > >>>> server10:/usr/src/linux # git bisect log > >>>> # bad: [74fca6a42863ffacaf7ba6f1936a9f228950f657] Linux 2.6.31 > >>>> # good: [07a2039b8eb0af4ff464efd3dfd95de5c02648c6] Linux 2.6.30 > >>>> git bisect start 'v2.6.31' 'v2.6.30' > >>>> # good: [925d74ae717c9a12d3618eb4b36b9fb632e2cef3] V4L/DVB (11736): > >>>> videobuf: modify return value of VIDIOC_REQBUFS ioctl > >>>> git bisect good 925d74ae717c9a12d3618eb4b36b9fb632e2cef3 > >>>> # bad: [a380137900fca5c79e6daa9500bdb6ea5649188e] ixgbe: Fix device > >>>> capabilities of 82599 single speed fiber NICs. > >>>> git bisect bad a380137900fca5c79e6daa9500bdb6ea5649188e > >>>> # good: [1dbb5765acc7a6fe4bc1957c001037cc9d02ae03] Staging: android: > >>>> lowmemorykiller: fix up remaining checkpatch warnings > >>>> git bisect good 1dbb5765acc7a6fe4bc1957c001037cc9d02ae03 > >>>> # good: [df36b439c5fedefe013d4449cb6a50d15e2f4d70] Merge branch > >>>> 'for-2.6.31' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6 > >>>> git bisect good df36b439c5fedefe013d4449cb6a50d15e2f4d70 > >>>> # bad: [a800faec1b21d7133b5f0c8c6dac593b7c4e118d] Merge branch > >>>> 'for-linus' > >>>> of git://www.jni.nu/cris > >>>> git bisect bad a800faec1b21d7133b5f0c8c6dac593b7c4e118d > >>>> # good: [ac1b7c378ef26fba6694d5f118fe7fc16fee2fe2] Merge > >>>> git://git.infradead.org/mtd-2.6 > >>>> git bisect good ac1b7c378ef26fba6694d5f118fe7fc16fee2fe2 > >>>> # bad: [37c6dbe290c05023b47f52528e30ce51336b93eb] V4L/DVB (12091): > >>>> gspca_sonixj: Add light frequency control > >>>> git bisect bad 37c6dbe290c05023b47f52528e30ce51336b93eb > >>>> # bad: [687d680985b1438360a9ba470ece8b57cd205c3b] Merge > >>>> git://git.infradead.org/~dwmw2/iommu-2.6.31 > >>>> git bisect bad 687d680985b1438360a9ba470ece8b57cd205c3b > >>>> # bad: [1053414068bad659479e6efa62a67403b8b1ec0a] Merge branch > >>>> 'for-linus' > >>>> of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 > >>>> git bisect bad 1053414068bad659479e6efa62a67403b8b1ec0a > >>>> # good: [b01b4babbf204443b5a846a7494546501614cefc] firewire: net: fix > >>>> card > >>>> driver reloading > >>>> git bisect good b01b4babbf204443b5a846a7494546501614cefc > >>>> # bad: [c02d7adf8c5429727a98bad1d039bccad4c61c50] NFSv4: Replace > >>>> nfs4_path_walk() with VFS path lookup in a private namespace > >>>> git bisect bad c02d7adf8c5429727a98bad1d039bccad4c61c50 > >>>> # good: [616511d039af402670de8500d0e24495113a9cab] VFS: Uninline the > >>>> function put_mnt_ns() > >>>> git bisect good 616511d039af402670de8500d0e24495113a9cab > >>>> # good: [cf8d2c11cb77f129675478792122f50827e5b0ae] VFS: Add VFS helper > >>>> functions for setting up private namespaces > >>>> git bisect good cf8d2c11cb77f129675478792122f50827e5b0ae > >>>> > >>>> > >>>> The last "git bisect good" prints out: > >>>> > >>>> server10:/usr/src/linux # git bisect good > >>>> c02d7adf8c5429727a98bad1d039bccad4c61c50 is the first bad commit > >>>> commit c02d7adf8c5429727a98bad1d039bccad4c61c50 > >>>> Author: Trond Myklebust <Trond.Myklebust@...app.com> > >>>> Date: Mon Jun 22 15:09:14 2009 -0400 > >>>> > >>>> NFSv4: Replace nfs4_path_walk() with VFS path lookup in a private > >>>> namespace > >>>> > >>>> As noted in the previous patch, the NFSv4 client mount code > >>>> > >> currently > >> > >>>> has several limitations. If the mount path contains symlinks, or > >>>> referrals, or even if it just contains a '..', then the client code > >>>> in > >>>> nfs4_path_walk() will fail with an error. > >>>> > >>>> This patch replaces the nfs4_path_walk()-based lookup with a helper > >>>> function that sets up a private namespace to represent the > >>>> > >> namespace > >> > >>>> on the > >>>> server, then uses the ordinary VFS and NFS path lookup code to walk > >>>> down the > >>>> mount path in that namespace. > >>>> > >>>> Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com> > >>>> Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org> > >>>> > >>>> :040000 040000 97a18818f26ab9a0987f157257eb6f399c3cc1cc > >>>> 9ab6c712bb64f1349b5ac9f2020191abb5780ca0 M fs > >>>> > >>>> Does this help you any further? > >>>> > >>>> Thanks! > >>>> Robert > >>>> > >>> Looks suspiciously like some error in testing. > >>> Could you pls retest and verify again that > >>> cf8d2c11cb77f129675478792122f50827e5b0ae > >>> is good and c02d7adf8c5429727a98bad1d039bccad4c61c50 is bad? > >>> -- 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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