[xen-4.12-testing bisection] doubtful build-amd64-prev

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

branch xen-4.12-testing
xenbranch xen-4.12-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:
   e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21 
6a3b59ab9c7dc00331c21346052dfa6a0df45aa3 
affb032b9b2624b67ffc7fb246a915dd08074b3f
  
  Identical previous flights on this branch:
   151039  started 2020-06-11 03:16:38 Z  blessed real-bisect
   151038  started 2020-06-11 03:09:59 Z  blessed real-bisect
   151037  started 2020-06-11 03:07:14 Z  blessed real-bisect
   151034  started 2020-06-11 02:20:25 Z  blessed real-bisect
   151031  started 2020-06-11 01:41:55 Z  blessed real-bisect
   151041  just generated


----------------------------------------
Running cs-bisection-step 
--graph-out=/home/logs/results/bisect/xen-4.12-testing/build-amd64-prev.xen-build
 --summary-out=tmp/151041.bisection-summary --basis-template=150176 
--blessings=real,real-bisect --flight=151041 xen-4.12-testing build-amd64-prev 
xen-build
Searching for failure / basis pass:
 150991 fail [host=fiano0] / 150176 [host=elbling0] 150072 [host=debina1] 
150041 [host=godello1] 149845 [host=godello1] 149838 [host=debina1] 149646 
[host=godello1] 149607 ok.
Failure / basis pass flights: 150991 / 149607
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 6aa48ab791ecc4fe22d110222bd7b566bc8a2274 
2e3de6253422112ae43e608661ba94ea6b345694 
7dd2ac39e40f0afe1cc6d879bfe65cbf19520cab
Basis pass e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21 
6a3b59ab9c7dc00331c21346052dfa6a0df45aa3 
affb032b9b2624b67ffc7fb246a915dd08074b3f
Generating revisions with ./adhoc-revtuple-generator  
git://xenbits.xen.org/osstest/ovmf.git#e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21-6aa48ab791ecc4fe22d110222bd7b566bc8a2274
 
git://xenbits.xen.org/osstest/seabios.git#6a3b59ab9c7dc00331c21346052dfa6a0df45aa3-2e3de6253422112ae43e608661ba94ea6b345694
 
git://xenbits.xen.org/xen.git#affb032b9b2624b67ffc7fb246a915dd08074b3f-7dd2ac39e40f0afe1cc6d879bfe65cbf19520cab
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:
 149583 [host=godello1]
 149646 [host=godello1]
 149607 pass e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21 
6a3b59ab9c7dc00331c21346052dfa6a0df45aa3 
affb032b9b2624b67ffc7fb246a915dd08074b3f
 149838 [host=debina1]
 149845 [host=godello1]
 150041 [host=godello1]
 150072 [host=debina1]
 150176 [host=elbling0]
 150943 [host=fiano1]
 151031 !! flight 151031 no revisions or trees
 151029 [host=fiano1]
 150991 fail 6aa48ab791ecc4fe22d110222bd7b566bc8a2274 
2e3de6253422112ae43e608661ba94ea6b345694 
7dd2ac39e40f0afe1cc6d879bfe65cbf19520cab
 151030 [host=fiano1]
 151037 !! flight 151037 no revisions or trees
 151039 !! flight 151039 no revisions or trees
 151034 !! flight 151034 no revisions or trees
 151038 !! flight 151038 no revisions or trees
Searching for interesting versions
 Result found: flight 149607 (pass), for basis pass
 For basis failure, parent search stopping at 
e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21 
6a3b59ab9c7dc00331c21346052dfa6a0df45aa3 
affb032b9b2624b67ffc7fb246a915dd08074b3f, results HASH(0x56478e5ffcf8) Result 
found: flight 150991 (fail), for basis failure (at ancestor ~5526)
Need to reproduce basis pass (pass); had 1 already.
Should test e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21 
6a3b59ab9c7dc00331c21346052dfa6a0df45aa3 
affb032b9b2624b67ffc7fb246a915dd08074b3f.
pnmtopng: 62 colors found
Revision graph left in 
/home/logs/results/bisect/xen-4.12-testing/build-amd64-prev.xen-build.{dot,ps,png,html,svg}.
Populating 151041...
Need 151041.build-amd64-prev (like 150991)
Creating 151041.build-amd64-prev (copying from 150991)
Checking for flail (since 149607)...

*** Flailing - >=5 identical flights to no useful effect ***
  Bisector is flailing: >=5 identical flights generated.
  Problem occurs when attempting to test this revision:
   e4004e8e505a9ca697b1d5aaee9b3ae25cdc3b21 
6a3b59ab9c7dc00331c21346052dfa6a0df45aa3 
affb032b9b2624b67ffc7fb246a915dd08074b3f
  
  Identical previous flights on this branch:
   151039  started 2020-06-11 03:16:38 Z  blessed real-bisect
   151038  started 2020-06-11 03:09:59 Z  blessed real-bisect
   151037  started 2020-06-11 03:07:14 Z  blessed real-bisect
   151034  started 2020-06-11 02:20:25 Z  blessed real-bisect
   151031  started 2020-06-11 01:41:55 Z  blessed real-bisect
   151041  just generated