[Xen-devel] [linux test] 6821: regressions - FAIL

[xen.org <ian.jackson@xxxxxxxxxxxxx>]

flight 6821 linux real [real]
http://www.chiark.greenend.org.uk/~xensrcts/logs/6821/

Regressions :-(

Tests which did not succeed and are blocking:
 test-amd64-i386-xl-credit2   10 guest-saverestore          fail REGR. vs. 6731

Tests which did not succeed, but are not blocking,
including regressions (tests previously passed) regarded as allowable:
 test-amd64-amd64-win         16 leak-check/check             fail   never pass
 test-amd64-amd64-xl-win      13 guest-stop                   fail   never pass
 test-amd64-i386-rhel6hvm-amd  8 guest-saverestore            fail   never pass
 test-amd64-i386-rhel6hvm-intel  8 guest-saverestore            fail never pass
 test-amd64-i386-win-vcpus1   16 leak-check/check             fail   never pass
 test-amd64-i386-win          16 leak-check/check             fail   never pass
 test-amd64-i386-xl-win-vcpus1 13 guest-stop                   fail  never pass
 test-i386-i386-pair          16 guest-start                  fail    like 6731
 test-i386-i386-win           16 leak-check/check             fail   never pass
 test-i386-i386-xl-win        13 guest-stop                   fail   never pass

version targeted for testing:
 linux                ae333e97552c81ab10395ad1ffc6d6daaadb144a
baseline version:
 linux                bb1a15e55ec665a64c8a9c6bd699b1f16ac01ff4

------------------------------------------------------------
People who touched revisions under test:
  Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
  Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
  Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
------------------------------------------------------------

jobs:
 build-amd64                                                  pass     
 build-i386                                                   pass     
 build-amd64-pvops                                            pass     
 build-i386-pvops                                             pass     
 test-amd64-amd64-xl                                          pass     
 test-amd64-i386-xl                                           pass     
 test-i386-i386-xl                                            pass     
 test-amd64-i386-rhel6hvm-amd                                 fail     
 test-amd64-i386-xl-credit2                                   fail     
 test-amd64-i386-rhel6hvm-intel                               fail     
 test-amd64-i386-xl-multivcpu                                 pass     
 test-amd64-amd64-pair                                        pass     
 test-amd64-i386-pair                                         pass     
 test-i386-i386-pair                                          fail     
 test-amd64-amd64-pv                                          pass     
 test-amd64-i386-pv                                           pass     
 test-i386-i386-pv                                            pass     
 test-amd64-i386-win-vcpus1                                   fail     
 test-amd64-i386-xl-win-vcpus1                                fail     
 test-amd64-amd64-win                                         fail     
 test-amd64-i386-win                                          fail     
 test-i386-i386-win                                           fail     
 test-amd64-amd64-xl-win                                      fail     
 test-i386-i386-xl-win                                        fail     


------------------------------------------------------------
sg-report-flight on woking.cam.xci-test.com
logs: /home/xc_osstest/logs
images: /home/xc_osstest/images

Logs, config files, etc. are available at
    http://www.chiark.greenend.org.uk/~xensrcts/logs

Test harness code can be found at
    http://xenbits.xensource.com/gitweb?p=osstest.git;a=summary


Not pushing.

------------------------------------------------------------
commit ae333e97552c81ab10395ad1ffc6d6daaadb144a
Author: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date:   Thu Dec 2 14:31:18 2010 -0800

    vmalloc: eagerly clear ptes on vunmap
    
    [ Backport from 64141da587241301ce8638cc945f8b67853156ec ]
    
    On stock 2.6.37-rc4, running:
    
      # mount lilith:/export /mnt/lilith
      # find  /mnt/lilith/ -type f -print0 | xargs -0 file
    
    crashes the machine fairly quickly under Xen.  Often it results in oops
    messages, but the couple of times I tried just now, it just hung quietly
    and made Xen print some rude messages:
    
        (XEN) mm.c:2389:d80 Bad type (saw 7400000000000001 != exp
        3000000000000000) for mfn 1d7058 (pfn 18fa7)
        (XEN) mm.c:964:d80 Attempt to create linear p.t. with write perms
        (XEN) mm.c:2389:d80 Bad type (saw 7400000000000010 != exp
        1000000000000000) for mfn 1d2e04 (pfn 1d1fb)
        (XEN) mm.c:2965:d80 Error while pinning mfn 1d2e04
    
    Which means the domain tried to map a pagetable page RW, which would
    allow it to map arbitrary memory, so Xen stopped it.  This is because
    vm_unmap_ram() left some pages mapped in the vmalloc area after NFS had
    finished with them, and those pages got recycled as pagetable pages
    while still having these RW aliases.
    
    Removing those mappings immediately removes the Xen-visible aliases, and
    so it has no problem with those pages being reused as pagetable pages.
    Deferring the TLB flush doesn't upset Xen because it can flush the TLB
    itself as needed to maintain its invariants.
    
    When unmapping a region in the vmalloc space, clear the ptes
    immediately.  There's no point in deferring this because there's no
    amortization benefit.
    
    The TLBs are left dirty, and they are flushed lazily to amortize the
    cost of the IPIs.
    
    This specific motivation for this patch is an oops-causing regression
    since 2.6.36 when using NFS under Xen, triggered by the NFS client's use
    of vm_map_ram() introduced in 56e4ebf877b60 ("NFS: readdir with vmapped
    pages") .  XFS also uses vm_map_ram() and could cause similar problems.
    
    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@xxxxxxxxxx>
    Cc: Nick Piggin <npiggin@xxxxxxxxx>
    Cc: Bryan Schumaker <bjschuma@xxxxxxxxxx>
    Cc: Trond Myklebust <Trond.Myklebust@xxxxxxxxxx>
    Cc: Alex Elder <aelder@xxxxxxx>
    Cc: Dave Chinner <david@xxxxxxxxxxxxx>
    Cc: Christoph Hellwig <hch@xxxxxx>
    Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

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