initdb failure on Debian sid/mips64el in EventTriggerEndCompleteQuery

10beta3 and 9.6.4 are both failing during initdb on mips64el on
Debian/sid (unstable):

https://buildd.debian.org/status/fetch.php?pkg=postgresql-9.6&arch=mips64el&ver=9.6.4-1&stamp=1502374949&raw=0
https://buildd.debian.org/status/fetch.php?pkg=postgresql-10&arch=mips64el&ver=10%7Ebeta3-1&stamp=1502535836&raw=0

All other architectures have succeeded, as well as the 9.6.4 build for
Debian/stretch (stable) on mips64el. The difference might be the
compiler version (6.3.0 vs 7.1.0).

Command was: "initdb" -D "/home/myon/postgresql-9.6/postgresql-9.6-9.6.3/build/src/t
est/regress/./tmp_check/data" --noclean --nosync > "/home/myon/postgresql-9.6/postgr
esql-9.6-9.6.3/build/src/test/regress/log/initdb.log" 2>&1

******** build/src/test/regress/log/initdb.log ********
Running in noclean mode. Mistakes will not be cleaned up.
The files belonging to this database system will be owned by user "myon".
This user must also own the server process.

The database cluster will be initialized with locales
COLLATE: de_DE.utf8
CTYPE: de_DE.utf8
MESSAGES: C
MONETARY: de_DE.utf8
NUMERIC: de_DE.utf8
TIME: de_DE.utf8
The default database encoding has accordingly been set to "UTF8".
The default text search configuration will be set to "german".

Data page checksums are disabled.

creating directory /home/myon/postgresql-9.6/postgresql-9.6-9.6.3/build/src/test/regress/./tmp_check/data ... ok
creating subdirectories ... ok
selecting default max_connections ... 100
selecting default shared_buffers ... 128MB
selecting dynamic shared memory implementation ... posix
creating configuration files ... ok
running bootstrap script ... ok
performing post-bootstrap initialization ... Segmentation fault (core dumped)
child process exited with exit code 139

$ gdb build/tmp_install/usr/lib/postgresql/9.6/bin/postgres build/src/test/regress/tmp_check/data/core
GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "mips64el-linux-gnuabi64".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from build/tmp_install/usr/lib/postgresql/9.6/bin/postgres...done.
[New LWP 24217]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/mips64el-linux-gnuabi64/libthread_db.so.1".
Core was generated by `/home/myon/postgresql-9.6/postgresql-9.6-9.6.3/build/tmp_install/usr/lib/postgr'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x000000aababa6634 in EventTriggerEndCompleteQuery ()
at ./build/../src/backend/commands/event_trigger.c:1263
1263 MemoryContextDelete(currentEventTriggerState->cxt);
(gdb) bt full
#0 0x000000aababa6634 in EventTriggerEndCompleteQuery ()
at ./build/../src/backend/commands/event_trigger.c:1263
prevstate = <optimized out>
#1 0x000000aabad6d508 in ProcessUtilitySlow (
parsetree=parsetree(at)entry=0xaac3688428,
queryString=queryString(at)entry=0xaac3687888 "REVOKE ALL on pg_authid FROM public;\n", context=context(at)entry=PROCESS_UTILITY_TOPLEVEL, params=params(at)entry=0x0,
completionTag=completionTag(at)entry=0xffff985218 "",
dest=0xaabb0a0378 <debugtupDR>) at ./build/../src/backend/tcop/utility.c:1582
isTopLevel = 1 '\001'
isCompleteQuery = 1 '\001'
needCleanup = 0 '\000'
commandCollected = <optimized out>
address = {classId = 2, objectId = 0, objectSubId = 0}
secondaryObject = {classId = 0, objectId = 0, objectSubId = 0}
#2 0x000000aabad6c6cc in standard_ProcessUtility (parsetree=0xaac3688428,
queryString=0xaac3687888 "REVOKE ALL on pg_authid FROM public;\n",
context=<optimized out>, params=0x0, dest=0xaabb0a0378 <debugtupDR>,
completionTag=0xffff985218 "") at ./build/../src/backend/tcop/utility.c:907
isTopLevel = 1 '\001'
__func__ = "standard_ProcessUtility"
#3 0x000000aabad6d33c in ProcessUtility (parsetree=<optimized out>,
queryString=<optimized out>, context=<optimized out>, params=<optimized out>,
dest=<optimized out>, completionTag=<optimized out>)
at ./build/../src/backend/tcop/utility.c:336
No locals.
#4 0x000000aabad68e80 in PortalRunUtility (portal=portal(at)entry=0xaac368a8a8,
utilityStmt=utilityStmt(at)entry=0xaac3688428,
isTopLevel=isTopLevel(at)entry=1 '\001',
setHoldSnapshot=setHoldSnapshot(at)entry=0 '\000',
dest=0xaabb0a0378 <debugtupDR>, completionTag=0xffff985218 "")
at ./build/../src/backend/tcop/pquery.c:1193
snapshot = 0xaac368c8e8
__func__ = "PortalRunUtility"
#5 0x000000aabad69d70 in PortalRunMulti (portal=portal(at)entry=0xaac368a8a8,
isTopLevel=isTopLevel(at)entry=1 '\001',
setHoldSnapshot=setHoldSnapshot(at)entry=0 '\000',
dest=dest(at)entry=0xaabb0a0378 <debugtupDR>,
altdest=altdest(at)entry=0xaabb0a0378 <debugtupDR>,
completionTag=completionTag(at)entry=0xffff985218 "")
at ./build/../src/backend/tcop/pquery.c:1349
stmt = 0xaac3688428
active_snapshot_set = 0 '\000'
stmtlist_item = 0xaac3688738
#6 0x000000aabad6ac44 in PortalRun (portal=portal(at)entry=0xaac368a8a8,
count=count(at)entry=9223372036854775807, isTopLevel=isTopLevel(at)entry=1 '\001',
dest=dest(at)entry=0xaabb0a0378 <debugtupDR>,
altdest=altdest(at)entry=0xaabb0a0378 <debugtupDR>,
completionTag=completionTag(at)entry=0xffff985218 "")
---Type <return> to continue, or q <return> to quit---
at ./build/../src/backend/tcop/pquery.c:815
save_exception_stack = 0xffff985068
save_context_stack = 0x0
local_sigjmp_buf = {{__jmpbuf = {{__pc = 733279071168,
__sp = 1099504831664, __regs = {733422847016, 733422856360,
733422847096, 1, 733282435960, 733422844040, 733282649704,
733422428264}, __fp = 733422847832, __gp = 733282512816,
__glibc_reserved1 = -1, __fpregs = {-nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff)}}}, __mask_was_saved = 0, __saved_mask = {
__val = {733282649704, 733422428264, 733282512816, 733422847832,
733280473476, 733422856360, 1099165163056, 733282073632, 1,
733282512816, 733280604384, 733282512816, 3618681818990495232,
733282512816, 3618681818990495232, 733422847016}}}}
result = <optimized out>
nprocessed = <optimized out>
saveTopTransactionResourceOwner = 0xaac361d088
saveTopTransactionContext = 0xaac3622068
saveActivePortal = 0x0
saveResourceOwner = 0xaac361d088
savePortalContext = 0x0
saveMemoryContext = 0xaac3622068
__func__ = "PortalRun"
#7 0x000000aabad6802c in exec_simple_query (
query_string=0xaac3687888 "REVOKE ALL on pg_authid FROM public;\n")
at ./build/../src/backend/tcop/postgres.c:1094
parsetree = 0xaac3688428
portal = 0xaac368a8a8
snapshot_set = <optimized out>
commandTag = <optimized out>
completionTag = "\000g\345\352\377\000\000\000w\245\252\377\377\000\000\000\034\b\327\352\377\000\000\000\060)\345\352\377\000\000\000\360g\345\352\377\000\000\000\320R\230\377\377\000\000\000\370\332\344\352\377\000\000\000\020\232\323\352\377\000\000"
querytree_list = <optimized out>
plantree_list = 0xaac3688758
receiver = 0xaabb0a0378 <debugtupDR>
format = 0
dest = DestDebug
parsetree_list = 0xaac3688498
save_log_statement_stats = 0 '\000'
was_logged = 0 '\000'
msec_str = "\020\326^ê\000\000\000\070|\337\352\377\000\000\000\370\226\335\352\377\000\000\000\000\000\000\000\000\000\000"
parsetree_item = 0xaac3688478
isTopLevel = 1 '\001'
#8 PostgresMain (argc=<optimized out>, argv=<optimized out>,
---Type <return> to continue, or q <return> to quit---
dbname=<optimized out>, username=<optimized out>)
at ./build/../src/backend/tcop/postgres.c:4076
query_string = 0xaac3687888 "REVOKE ALL on pg_authid FROM public;\n"
input_message = {
data = 0xaac3687888 "REVOKE ALL on pg_authid FROM public;\n", len = 38,
maxlen = 1024, cursor = 38}
local_sigjmp_buf = {{__jmpbuf = {{__pc = 733279051620,
__sp = 1099504832144, __regs = {733282651656, 10, 733422077472,
733282527592, 0, 733422071296, 0, 1099506026728},
__fp = 1099506034039, __gp = 733282512816, __glibc_reserved1 = 0,
__fpregs = {-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff)}}},
__mask_was_saved = 1, __saved_mask = {__val = {0, 0, 733422206784,
1099506026728, 1099111271600, 0, 1099157352184, 1099157547312,
1099111271600, 0, 1099157352184, 1099157547312, 1024,
1099157563376, 1099156624308, 1099109578624}}}}
send_ready_for_query = 0 '\000'
disable_idle_in_transaction_timeout = 0 '\000'
__func__ = "PostgresMain"
#9 0x000000aabaa65658 in main (argc=<optimized out>, argv=0xaac35e7160)
at ./build/../src/backend/main/main.c:224
No locals.
(gdb) l
1258 EventTriggerQueryState *prevstate;
1259
1260 prevstate = currentEventTriggerState->previous;
1261
1262 /* this avoids the need for retail pfree of SQLDropList items: */
1263 MemoryContextDelete(currentEventTriggerState->cxt);
1264
1265 currentEventTriggerState = prevstate;
1266 }
1267

$ gcc --version
gcc (Debian 7.1.0-11) 7.1.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Christoph