[xen-unstable-smoke bisection] 173630: testing test-armhf-armhf-xl

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

branch xen-unstable-smoke
xenbranch xen-unstable-smoke
job test-armhf-armhf-xl
testid guest-start

Tree: linux git://xenbits.xen.org/linux-pvops.git
Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
Tree: qemuu git://xenbits.xen.org/qemu-xen.git
Tree: xen git://xenbits.xen.org/xen.git

For bisection revision-tuple graph see:
   
http://logs.test-lab.xenproject.org/osstest/results/bisect/xen-unstable-smoke/test-armhf-armhf-xl.guest-start.html
Revision IDs in each graph node refer, respectively, to the Trees above.

----------------------------------------
Running cs-bisection-step 
--graph-out=/home/logs/results/bisect/xen-unstable-smoke/test-armhf-armhf-xl.guest-start
 --summary-out=tmp/173630.bisection-summary --basis-template=173457 
--blessings=real,real-bisect,real-retry --flight=173630 xen-unstable-smoke 
test-armhf-armhf-xl guest-start
Searching for failure / basis pass:
 173604 fail [host=cubietruck-braque] / 173457 ok.
Failure / basis pass flights: 173604 / 173457
Tree: linux git://xenbits.xen.org/linux-pvops.git
Tree: linuxfirmware git://xenbits.xen.org/osstest/linux-firmware.git
Tree: qemuu git://xenbits.xen.org/qemu-xen.git
Tree: xen git://xenbits.xen.org/xen.git
Latest f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
87a20c98d9f0f422727fe9b4b9e22c2c43a5cd9c
Basis pass f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
9029bc265cdf2bd63376dde9fdd91db4ce9c0586
Generating revisions with ./adhoc-revtuple-generator  
git://xenbits.xen.org/linux-pvops.git#f0f0e602f7c9781699ecda9be763eac0b03d54f0-f0f0e602f7c9781699ecda9be763eac0b03d54f0
 
git://xenbits.xen.org/osstest/linux-firmware.git#c530a75c1e6a472b0eb9558310b518f0dfcd8860-c530a75c1e6a472b0eb9558310b518f0dfcd8860
 
git://xenbits.xen.org/qemu-xen.git#b746458e1ce1bec85e58b458386f8b7a0bedfaa6-b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 git://xenbits.xen.org/xen.git#9029bc265cdf2bd63376dde9fdd91db4ce9c0586-87a20c9\
 8d9f0f422727fe9b4b9e22c2c43a5cd9c
Loaded 5001 nodes in revision graph
Searching for test results:
 173457 pass f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
9029bc265cdf2bd63376dde9fdd91db4ce9c0586
 173492 [host=cubietruck-gleizes]
 173501 fail f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
87a20c98d9f0f422727fe9b4b9e22c2c43a5cd9c
 173504 pass f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
9029bc265cdf2bd63376dde9fdd91db4ce9c0586
 173506 [host=cubietruck-gleizes]
 173518 fail f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
87a20c98d9f0f422727fe9b4b9e22c2c43a5cd9c
 173538 [host=cubietruck-picasso]
 173545 [host=cubietruck-gleizes]
 173574 [host=cubietruck-picasso]
 173583 [host=arndale-lakeside]
 173600 [host=cubietruck-picasso]
 173602 [host=arndale-lakeside]
 173604 fail f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
87a20c98d9f0f422727fe9b4b9e22c2c43a5cd9c
 173609 [host=arndale-lakeside]
 173615 pass f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
f50a2c0e1d057c00d6061f40ae24d068226052ad
Searching for interesting versions
 Result found: flight 173457 (pass), for basis pass
 For basis failure, parent search stopping at 
f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
f50a2c0e1d057c00d6061f40ae24d068226052ad, results HASH(0x564f64f8c578) For 
basis failure, parent search stopping at 
f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
9029bc265cdf2bd63376dde9fdd91db4ce9c0586, results HASH(0x564f64f981e0) 
HASH(0x564f64f9ce18) \
 Result found: flight 173501 (fail), for basis failure (at ancestor ~600)
 Repro found: flight 173504 (pass), for basis pass
 Repro found: flight 173518 (fail), for basis failure
 7 revisions at f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
6e3aab858eef614a21a782a3b73acc88e74690ea
Looking 3 below f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
6e3aab858eef614a21a782a3b73acc88e74690ea.
Should test f0f0e602f7c9781699ecda9be763eac0b03d54f0 
c530a75c1e6a472b0eb9558310b518f0dfcd8860 
b746458e1ce1bec85e58b458386f8b7a0bedfaa6 
55914f7fc91a468649b8a3ec3f53ae1c4aca6670.
Revision graph left in 
/home/logs/results/bisect/xen-unstable-smoke/test-armhf-armhf-xl.guest-start.{dot,ps,png,html,svg}.
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Searching for build-armhf (like 173604) to reuse...
Creating 173630.build-armhf (copying from 173604)
DB confict (err=7 state=40001): DBD::Pg::db do failed: ERROR:  could not 
serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during write.
HINT:  The transaction might succeed if retried. [for Statement "            
INSERT INTO jobs (flight, job, recipe, status)
                      VALUES (?, ?, ?, 'queued')
"]
DB conflict (messages above may refer); retrying after 0.393291586618037...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 1.87658772030312...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 1.89789662079275...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 2.2510169040286...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 3.28004339191958...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 1.01159236943923...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 0.677249125929283...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 3.63325527156911...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 2.86751948289174...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 9.15640289488465...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
DB confict (err=7 state=40001): DBD::Pg::db selectrow_hashref failed: ERROR:  
could not serialize access due to read/write dependencies among transactions
DETAIL:  Reason code: Canceled on identification as a pivot, during conflict 
out checking.
HINT:  The transaction might succeed if retried. [for Statement "            
SELECT  *
            FROM    flights JOIN jobs j USING (flight)
            WHERE   j.job=?
            AND     j.status='pass'
            AND     (blessing='real' OR  blessing='real-bisect' OR  
blessing='real-retry')
            AND     (TRUE)
            AND     0 = ( SELECT count(*)
                          FROM
                              ( SELECT name,val
                                FROM   runvars
                                WHERE  runvars.flight = flights.flight
                                  AND  job=? AND synth='f'
                              ) o
                          FULL OUTER JOIN
                              bisection_runvars want
                          USING (name)
                          WHERE (o.val = want.val) IS NOT TRUE
                        )
            ORDER BY flights.started desc
            LIMIT 1
"]
DB conflict (messages above may refer); retrying after 10.842806938748...
Populating 173630...
Need 173630.test-armhf-armhf-xl (like 173604)
Creating 173630.test-armhf-armhf-xl (copying from 173604)
Need 173630.build-armhf (like 173604)
 revision_qemuu=b746458e1ce1bec85e58b458386f8b7a0bedfaa6
 revision_xen=55914f7fc91a468649b8a3ec3f53ae1c4aca6670
Creating 173630.build-armhf (copying from 173604)
Need 173630.build-armhf-pvops (like 173488)
 revision_linux=f0f0e602f7c9781699ecda9be763eac0b03d54f0
 revision_linuxfirmware=c530a75c1e6a472b0eb9558310b518f0dfcd8860
Searching for build-armhf-pvops (like 173488) to reuse...
Can reuse build-kern 173546.build-armhf-pvops.
Already created build-armhf
Checking for flail (since 173457)...
Flight 173630 ready to go.