[xen-4.11-testing bisection] doubtful build-amd64-prev

[osstest service owner <osstest-admin@xxxxxxxxxxxxxx>]

branch xen-4.11-testing
xenbranch xen-4.11-testing
job build-amd64-prev
testid xen-build

Tree: ovmf prev git://xenbits.xen.org/osstest/ovmf.git
Tree: seabios prev git://xenbits.xen.org/osstest/seabios.git
Tree: xen prev git://xenbits.xen.org/xen.git

*** Flailing - >=5 identical flights to no useful effect ***
  Bisector is flailing: >=5 identical flights generated.
  Problem occurs when attempting to test this revision:
   0980779a9ddcd9c98a68d57d214b4f466bb680b0 
76551856b28d227cb0386a1ab0e774329b941f7d 
49a5d6e92317a7d9acbf0bdbd25b2809dfd84260
  
  Identical previous flights on this branch:
   150965  started 2020-06-09 20:08:25 Z  blessed real-bisect
   150961  started 2020-06-09 19:52:12 Z  blessed real-bisect
   150959  started 2020-06-09 19:42:27 Z  blessed real-bisect
   150957  started 2020-06-09 19:35:35 Z  blessed real-bisect
   150955  started 2020-06-09 19:08:12 Z  blessed real-bisect
   150969  just generated


----------------------------------------
Running cs-bisection-step 
--graph-out=/home/logs/results/bisect/xen-4.11-testing/build-amd64-prev.xen-build
 --summary-out=tmp/150969.bisection-summary --basis-template=150040 
--blessings=real,real-bisect --flight=150969 xen-4.11-testing build-amd64-prev 
xen-build
Searching for failure / basis pass:
 150942 fail [host=huxelrebe0] / 150040 [host=debina1] 149701 [host=pinot1] 
149651 [host=elbling0] 149556 [host=fiano1] 148127 ok.
Failure / basis pass flights: 150942 / 148127
Tree: ovmf prev git://xenbits.xen.org/osstest/ovmf.git
Tree: seabios prev git://xenbits.xen.org/osstest/seabios.git
Tree: xen prev git://xenbits.xen.org/xen.git
Latest 6ff7c838d09224dd4e4c9b5b93152d8db1b19740 
2e3de6253422112ae43e608661ba94ea6b345694 
b922c4431df33ed5b724e53c3f3348e470ddd349
Basis pass 0980779a9ddcd9c98a68d57d214b4f466bb680b0 
76551856b28d227cb0386a1ab0e774329b941f7d 
49a5d6e92317a7d9acbf0bdbd25b2809dfd84260
Generating revisions with ./adhoc-revtuple-generator  
git://xenbits.xen.org/osstest/ovmf.git#0980779a9ddcd9c98a68d57d214b4f466bb680b0-6ff7c838d09224dd4e4c9b5b93152d8db1b19740
 
git://xenbits.xen.org/osstest/seabios.git#76551856b28d227cb0386a1ab0e774329b941f7d-2e3de6253422112ae43e608661ba94ea6b345694
 
git://xenbits.xen.org/xen.git#49a5d6e92317a7d9acbf0bdbd25b2809dfd84260-b922c4431df33ed5b724e53c3f3348e470ddd349
Use of uninitialized value $parents in array dereference at 
./adhoc-revtuple-generator line 465.
Use of uninitialized value in concatenation (.) or string at 
./adhoc-revtuple-generator line 465.
Loaded 12573 nodes in revision graph
Searching for test results:
 148127 pass 0980779a9ddcd9c98a68d57d214b4f466bb680b0 
76551856b28d227cb0386a1ab0e774329b941f7d 
49a5d6e92317a7d9acbf0bdbd25b2809dfd84260
 149556 [host=fiano1]
 149651 [host=elbling0]
 149701 [host=pinot1]
 150040 [host=debina1]
 150942 fail 6ff7c838d09224dd4e4c9b5b93152d8db1b19740 
2e3de6253422112ae43e608661ba94ea6b345694 
b922c4431df33ed5b724e53c3f3348e470ddd349
 150955 !! flight 150955 no revisions or trees
 150957 !! flight 150957 no revisions or trees
 150959 !! flight 150959 no revisions or trees
 150961 !! flight 150961 no revisions or trees
 150965 !! flight 150965 no revisions or trees
Searching for interesting versions
 Result found: flight 148127 (pass), for basis pass
 For basis failure, parent search stopping at 
0980779a9ddcd9c98a68d57d214b4f466bb680b0 
76551856b28d227cb0386a1ab0e774329b941f7d 
49a5d6e92317a7d9acbf0bdbd25b2809dfd84260, results HASH(0x55be212fc250) Result 
found: flight 150942 (fail), for basis failure (at ancestor ~5395)
Need to reproduce basis pass (pass); had 1 already.
Should test 0980779a9ddcd9c98a68d57d214b4f466bb680b0 
76551856b28d227cb0386a1ab0e774329b941f7d 
49a5d6e92317a7d9acbf0bdbd25b2809dfd84260.
pnmtopng: 35 colors found
Revision graph left in 
/home/logs/results/bisect/xen-4.11-testing/build-amd64-prev.xen-build.{dot,ps,png,html,svg}.
Populating 150969...
Need 150969.build-amd64-prev (like 150942)
Creating 150969.build-amd64-prev (copying from 150942)
Checking for flail (since 148127)...

*** Flailing - >=5 identical flights to no useful effect ***
  Bisector is flailing: >=5 identical flights generated.
  Problem occurs when attempting to test this revision:
   0980779a9ddcd9c98a68d57d214b4f466bb680b0 
76551856b28d227cb0386a1ab0e774329b941f7d 
49a5d6e92317a7d9acbf0bdbd25b2809dfd84260
  
  Identical previous flights on this branch:
   150965  started 2020-06-09 20:08:25 Z  blessed real-bisect
   150961  started 2020-06-09 19:52:12 Z  blessed real-bisect
   150959  started 2020-06-09 19:42:27 Z  blessed real-bisect
   150957  started 2020-06-09 19:35:35 Z  blessed real-bisect
   150955  started 2020-06-09 19:08:12 Z  blessed real-bisect
   150969  just generated