Bus error in formatting.c NUM_numpart_to_char (9.4.12, 9.6.3, sparc)

Hi,

I was trying to compile 9.4.12 on sparc from the debian source package in the pgdg repo, but it's failing multiple regression tests. One numeric test crashes the backend:

LOG: server process (PID 20659) was terminated by signal 10: Bus error
DETAIL: Failed process was running: SELECT '' AS to_char_6, to_char(val, 'FMS9999999999999999.999999999999999') FROM num_data;

Reading symbols from /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/src/backend/postgres...done.
[New LWP 20659]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/sparc-linux-gnu/libthread_db.so.1".
Core was generated by `postgres: turelto regression [local] SELECT '.
Program terminated with signal 10, Bus error.
#0 NUM_numpart_to_char (id=3, Np=0xffa04a54)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/utils/adt/formatting.c:4419
4419 if (Np->Num->lsign == NUM_LSIGN_PRE)
(gdb) l
4414 (Np->num_curr >= Np->out_pre_spaces || (IS_ZERO(Np->Num) && Np->Num->zero_start == Np->num_curr)) &&
4415 (IS_PREDEC_SPACE(Np) == FALSE || (Np->last_relevant && *Np->last_relevant == '.')))
4416 {
4417 if (IS_LSIGN(Np->Num))
4418 {
4419 if (Np->Num->lsign == NUM_LSIGN_PRE)
4420 {
4421 if (Np->sign == '-')
4422 strcpy(Np->inout_p, Np->L_negative_sign);
4423 else
(gdb) bt full
#0 NUM_numpart_to_char (id=3, Np=0xffa04a54)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/utils/adt/formatting.c:4419
end = <optimized out>
#1 NUM_processor (node=<optimized out>, Num=<optimized out>, inout=<optimized out>, number=<optimized out>,
from_char_input_len=0, to_char_out_pre_spaces=<optimized out>, sign=43, is_to_char=1 '\001',
collid=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/utils/adt/formatting.c:4773
n = <optimized out>
_Np = {is_to_char = 1 '\001', Num = 0xffa04b18, sign = 43, sign_wrote = 0, num_count = 30, num_in = 0,
num_curr = 15, out_pre_spaces = 15, read_dec = 0, read_post = 0, read_pre = 0,
number = 0x61b440 "0.", '0' <repeats 15 times>, number_p = 0x61b440 "0.", '0' <repeats 15 times>,
inout = 0x61b1d4 "", inout_p = 0x61b1d4 "", last_relevant = 0x61b441 ".", '0' <repeats 15 times>,
L_negative_sign = 0x4c1438 "-", L_positive_sign = 0x3f5638 "+", decimal = 0x4cd530 ".",
L_thousands_sep = 0x49dd78 ",", L_currency_symbol = 0x4edd08 " "}
#2 0x002f2920 in numeric_to_char (fcinfo=0x618bd4)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/utils/adt/formatting.c:5181
len = <optimized out>
value = <optimized out>
fmt = <optimized out>
Num = {pre = 16, post = 15, lsign = -1, flag = 98, pre_lsign_num = 0, multi = 0, zero_start = 0, zero_end = 0,
need_locale = 1}
format = 0x540d30
result = 0x61b1d0
shouldFree = <optimized out>
out_pre_spaces = <optimized out>
sign = 43
numstr = 0x61b440 "0.", '0' <repeats 15 times>
orgnum = <optimized out>
p = <optimized out>
x = <optimized out>
#3 0x001aa0f0 in ExecMakeFunctionResultNoSets (fcache=0x618b98, econtext=0x618ab8, isNull=0x619721 "",
isDone=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execQual.c:2026
arg = <optimized out>
result = <optimized out>
fcinfo = 0x618bd4
fcusage = {fs = 0x0, save_f_total_time = {tv_sec = 0, tv_usec = 0}, save_total = {tv_sec = 0, tv_usec = 0},
f_start = {tv_sec = 0, tv_usec = 0}}
i = <optimized out>
#4 0x001ae258 in ExecTargetList (isDone=0xffa04c84, itemIsDone=0x6197d8, isnull=0x619720 "", values=0x619710,
econtext=0x618ab8, targetlist=0x6197b0)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execQual.c:5334
gstate = <optimized out>
tle = <optimized out>
resind = <optimized out>
oldContext = 0x5f6640
tl = 0x6197c8
haveDoneSets = <optimized out>
#5 ExecProject (projInfo=<optimized out>, isDone=0xffa04c84)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execQual.c:5549
slot = 0x619018
econtext = 0x618ab8
numSimpleVars = <optimized out>
#6 0x001ae650 in ExecScan (node=0x618a30, accessMtd=0x1bfc80 <SeqNext>, recheckMtd=0x1bfc60 <SeqRecheck>)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execScan.c:207
slot = 0x619088
econtext = 0x618ab8
qual = 0x0
projInfo = 0x619730
isDone = ExprSingleResult
resultSlot = <optimized out>
#7 0x001a7650 in ExecProcNode (node=0x618a30)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execProcnode.c:400
result = <optimized out>
__func__ = "ExecProcNode"
#8 0x001a443c in ExecutePlan (dest=0x5d11f8, direction=<optimized out>, numberTuples=0, sendTuples=<optimized out>,
operation=CMD_SELECT, planstate=0x618a30, estate=0x6189a8)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execMain.c:1490
slot = <optimized out>
current_tuple_count = 0
#9 standard_ExecutorRun (queryDesc=0x605f88, direction=<optimized out>, count=0)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/executor/execMain.c:319
estate = 0x6189a8
operation = CMD_SELECT
dest = 0x5d11f8
sendTuples = <optimized out>
oldcontext = 0x5f66f0
#10 0x002ac734 in PortalRunSelect (portal=0x5fb768, forward=1 '\001', count=0, dest=0x5d11f8)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/tcop/pquery.c:942
queryDesc = 0x605f88
direction = ForwardScanDirection
nprocessed = <optimized out>
__func__ = "PortalRunSelect"
#11 0x002adabc in PortalRun (portal=0x5fb768, count=2147483647, isTopLevel=1 '\001', dest=0x5d11f8, altdest=0x5d11f8,
completionTag=0xffa05040 "") at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/tcop/pquery.c:786
save_exception_stack = 0xffa04f84
save_context_stack = 0x0
local_sigjmp_buf = {{__jmpbuf = {-285518332, -285518572, 292667848}, __mask_was_saved = 0, __saved_mask = {
__val = {4288696024, 5679664, 16777218, 0, 13, 1076, 0, 0, 5611552, 5614592, 5459968, 5611520, 5397504,
120, 5681576, 1886539776, 6097184, 0, 0, 0, 0, 6097168, 4288696024, 2792652, 90, 6247456, 2, 1, 0, 1,
1024, 0}}}}
result = <optimized out>
nprocessed = <optimized out>
saveTopTransactionResourceOwner = 0x56aa30
---Type <return> to continue, or q <return> to quit---
saveTopTransactionContext = 0x56ab38
saveActivePortal = 0x0
saveResourceOwner = 0x56aa30
savePortalContext = 0x0
saveMemoryContext = 0x56ab38
__func__ = "PortalRun"
#12 0x002a9ba4 in exec_simple_query (
query_string=0x5cf4d8 "SELECT '' AS to_char_6, to_char(val, 'FMS", '9' <repeats 16 times>, ".", '9' <repeats 15 times>, "') FROM num_data;") at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/tcop/postgres.c:1072
parsetree = 0x5d00e8
portal = 0x5fb768
snapshot_set = <optimized out>
commandTag = <optimized out>
completionTag = "\000ELECT 10\000\000E", '\000' <repeats 35 times>, "\024\000\000\000\024\377\377\377\377\000R\\\304\000R\\P"
plantree_list = 0x5d11e0
receiver = 0x5d11f8
format = 0
dest = DestRemote
parsetree_list = 0x5d0180
save_log_statement_stats = 0 '\000'
was_logged = 0 '\000'
msec_str = "\000\240P\250\000\006\004\320\000\000\000\000\000X\324d0\n\000\034", '\000' <repeats 11 times>, "\002"
parsetree_item = 0x5d0170
isTopLevel = <optimized out>
#13 PostgresMain (argc=<optimized out>, argv=<optimized out>, dbname=0x5694a0 "regression", username=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/tcop/postgres.c:4100
query_string = 0x5cf4d8 "SELECT '' AS to_char_6, to_char(val, 'FMS", '9' <repeats 16 times>, ".", '9' <repeats 15 times>, "') FROM num_data;"
firstchar = 6095080
input_message = {
data = 0x5cf4d8 "SELECT '' AS to_char_6, to_char(val, 'FMS", '9' <repeats 16 times>, ".", '9' <repeats 15 times>, "') FROM num_data;", len = 95, maxlen = 1024, cursor = 95}
local_sigjmp_buf = {{__jmpbuf = {-285518572, -285521052, 292654784}, __mask_was_saved = 1, __saved_mask = {
__val = {0, 0, 0, 0, 1882663060, 1879054856, 1881810088, 0, 1, 0, 0, 0, 1881097612, 4, 0, 0, 0, 0, 0, 0,
1886539776, 1886551248, 1886551248, 5821840, 0, 0, 0, 4288696392, 1885505112, 4288696368, 2364184,
0}}}}
send_ready_for_query = 0 '\000'
__func__ = "PostgresMain"
#14 0x000606b0 in BackendRun (port=0x58d3d8)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/postmaster/postmaster.c:4301
ac = 1
secs = 551365461
usecs = 297758
i = 1
av = 0x569610
maxac = <optimized out>
#15 BackendStartup (port=0x58d3d8)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/postmaster/postmaster.c:3964
bn = 0x10c3
pid = 0
#16 ServerLoop () at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/postmaster/postmaster.c:1694
port = 0x58d3d8
rmask = {fds_bits = {16, 0 <repeats 31 times>}}
selres = <optimized out>
now = <optimized out>
readmask = {fds_bits = {16, 0 <repeats 31 times>}}
nSockets = 5
last_lockfile_recheck_time = 1498050259
last_touch_time = 1498050259
__func__ = "ServerLoop"
#17 0x0024d334 in PostmasterMain (argc=8, argv=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/postmaster/postmaster.c:1302
opt = <optimized out>
status = <optimized out>
userDoption = <optimized out>
listen_addr_saved = <optimized out>
i = <optimized out>
output_config_variable = <optimized out>
__func__ = "PostmasterMain"
#18 0x000616f0 in main (argc=8, argv=0x568b88)
at /home/turelto/src/tmp/postgresql-9.4-9.4.12/build/../src/backend/main/main.c:233
No locals.

It seems this issue was introduced in 9.4.9: 9.4.9, 9.4.10, 9.4.11 and 9.4.12 all crash at the same test at the same line in formatting.c, but 9.4.8 builds successfully and passes all tests. It also seems that both NUM_numpart_to_char and the failing test have not been touched for, eh, decades, so the root cause must be somewhere else.

The same issue is present in 9.6.3:

LOG: server process (PID 10632) was terminated by signal 10: Bus error
DETAIL: Failed process was running: SELECT '' AS to_char_6, to_char(val, 'FMS9999999999999999.999999999999999') FROM num_data;

Reading symbols from /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/src/backend/postgres...done.
[New LWP 10632]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/sparc-linux-gnu/libthread_db.so.1".
Core was generated by `postgres: turelto regression [local] SELECT '.
Program terminated with signal 10, Bus error.
#0 NUM_numpart_to_char (id=3, Np=0xff924b5c)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/utils/adt/formatting.c:4434
4434 if (Np->Num->lsign == NUM_LSIGN_PRE)
(gdb) l
4429 (Np->num_curr >= Np->out_pre_spaces || (IS_ZERO(Np->Num) && Np->Num->zero_start == Np->num_curr)) &&
4430 (IS_PREDEC_SPACE(Np) == FALSE || (Np->last_relevant && *Np->last_relevant == '.')))
4431 {
4432 if (IS_LSIGN(Np->Num))
4433 {
4434 if (Np->Num->lsign == NUM_LSIGN_PRE)
4435 {
4436 if (Np->sign == '-')
4437 strcpy(Np->inout_p, Np->L_negative_sign);
4438 else
(gdb) bt full
#0 NUM_numpart_to_char (id=3, Np=0xff924b5c)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/utils/adt/formatting.c:4434
end = <optimized out>
#1 NUM_processor (node=<optimized out>, Num=<optimized out>, inout=<optimized out>, number=<optimized out>,
from_char_input_len=0, to_char_out_pre_spaces=<optimized out>, sign=43, is_to_char=1 '\001',
collid=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/utils/adt/formatting.c:4788
n = <optimized out>
_Np = {is_to_char = 1 '\001', Num = 0xff924c20, sign = 43, sign_wrote = 0, num_count = 30, num_in = 0,
num_curr = 15, out_pre_spaces = 15, read_dec = 0, read_post = 0, read_pre = 0,
number = 0x6bdac0 "0.", '0' <repeats 15 times>, number_p = 0x6bdac0 "0.", '0' <repeats 15 times>,
inout = 0x6bd854 "", inout_p = 0x6bd854 "", last_relevant = 0x6bdac1 ".", '0' <repeats 15 times>,
L_negative_sign = 0x555908 "-", L_positive_sign = 0x4789d8 "+", decimal = 0x565d10 ".",
L_thousands_sep = 0x52ed18 ",", L_currency_symbol = 0x588920 " "}
#2 0x00354920 in numeric_to_char (fcinfo=0x6bbae4)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/utils/adt/formatting.c:5213
len = <optimized out>
value = <optimized out>
fmt = <optimized out>
Num = {pre = 16, post = 15, lsign = -1, flag = 98, pre_lsign_num = 0, multi = 0, zero_start = 0, zero_end = 0,
need_locale = 1}
format = 0x5dc09c
result = 0x6bd850
shouldFree = <optimized out>
out_pre_spaces = <optimized out>
sign = 43
numstr = 0x6bdac0 "0.", '0' <repeats 15 times>
orgnum = <optimized out>
p = <optimized out>
x = <optimized out>
#3 0x001e16b0 in ExecMakeFunctionResultNoSets (fcache=0x6bbaa8, econtext=0x6bb9c8, isNull=0x6bc229 "",
isDone=<optimized out>) at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execQual.c:2041
arg = <optimized out>
result = <optimized out>
fcinfo = 0x6bbae4
fcusage = {fs = 0x0, save_f_total_time = {tv_sec = 1, tv_usec = 0}, save_total = {tv_sec = 0, tv_usec = 0},
f_start = {tv_sec = 0, tv_usec = 0}}
i = <optimized out>
#4 0x001e5840 in ExecTargetList (isDone=0xff924d8c, itemIsDone=0x6bc2e0, isnull=0x6bc228 "", values=0x6bc218,
econtext=0x6bb9c8, tupdesc=<optimized out>, targetlist=0x6bc2b8)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execQual.c:5423
gstate = <optimized out>
tle = <optimized out>
resind = <optimized out>
att = 0x6bc02c
oldContext = 0x655430
tl = 0x6bc2d0
haveDoneSets = <optimized out>
#5 ExecProject (projInfo=<optimized out>, isDone=0xff924d8c)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execQual.c:5647
slot = 0x6bbf28
econtext = 0x6bb9c8
numSimpleVars = <optimized out>
#6 0x001e5c84 in ExecScan (node=0x6bb940, accessMtd=0x1faec0 <SeqNext>, recheckMtd=0x1faea0 <SeqRecheck>)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execScan.c:220
slot = 0x6bbf98
econtext = 0x6bb9c8
qual = 0x0
projInfo = 0x6bc238
isDone = ExprSingleResult
resultSlot = <optimized out>
#7 0x001de620 in ExecProcNode (node=0x6bb940)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execProcnode.c:419
result = <optimized out>
__func__ = "ExecProcNode"
#8 0x001da304 in ExecutePlan (dest=0x69c620, direction=<optimized out>, numberTuples=0, sendTuples=<optimized out>,
operation=CMD_SELECT, use_parallel_mode=<optimized out>, planstate=0x6bb940, estate=0x6bb838)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execMain.c:1569
slot = <optimized out>
current_tuple_count = 0
#9 standard_ExecutorRun (queryDesc=0x6a61f8, direction=<optimized out>, count=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/executor/execMain.c:338
estate = 0x6bb838
operation = CMD_SELECT
dest = 0x69c620
sendTuples = <optimized out>
oldcontext = 0x6549b0
#10 0x0030606c in PortalRunSelect (portal=0x6233a0, forward=<optimized out>, count=0, dest=0x69c620)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/tcop/pquery.c:948
queryDesc = 0x6a61f8
direction = <optimized out>
nprocessed = <optimized out>
__func__ = "PortalRunSelect"
#11 0x0030747c in PortalRun (portal=0x6233a0, count=2147483647, isTopLevel=1 '\001', dest=0x69c620, altdest=0x69c620,
completionTag=0xff925160 "") at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/tcop/pquery.c:789
save_exception_stack = 0xff9250a4
save_context_stack = 0x0
local_sigjmp_buf = {{__jmpbuf = {-488613709, -488613485, 490890671}, __mask_was_saved = 0, __saved_mask = {
__val = {16797688, 6621224, 2, 0, 6165432, 931, 0, 0, 6165432, 6168576, 6094848, 6165504, 6053888, 120,
6320304, 1886343168, 6812424, 256, 0, 0, 0, 6812408, 4287778808, 3159308, 97, 1130710192, 2, 1, 0, 1,
1024, 0}}}}
result = <optimized out>
nprocessed = <optimized out>
saveTopTransactionResourceOwner = 0x650828
saveTopTransactionContext = 0x655298
saveActivePortal = 0x0
saveResourceOwner = 0x650828
savePortalContext = 0x0
saveMemoryContext = 0x655298
__func__ = "PortalRun"
#12 0x003033e4 in exec_simple_query (
query_string=0x67dec0 "SELECT '' AS to_char_6, to_char(val, 'FMS", '9' <repeats 16 times>, ".", '9' <repeats 15 times>, "') FROM num_data;") at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/tcop/postgres.c:1094
parsetree = 0x67ead0
portal = 0x6233a0
snapshot_set = <optimized out>
commandTag = <optimized out>
completionTag = "\000ELECT 10\000\000E", '\000' <repeats 35 times>, "\024\000\000\000\024\377\377\377\377\000]\000\364\000\\\377", <incomplete sequence \364>
plantree_list = 0x69c608
receiver = 0x69c620
format = 0
dest = DestRemote
parsetree_list = 0x67eb68
save_log_statement_stats = 0 '\000'
was_logged = 0 '\000'
msec_str = "\000\222Q\310\000\006\324\344\000bs\244\000bt$\000\000\000\034\000\000\000 \000bG0\000\000\000"
parsetree_item = 0x67eb58
isTopLevel = <optimized out>
#13 PostgresMain (argc=<optimized out>, argv=<optimized out>, dbname=0x606c70 "regression", username=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/tcop/postgres.c:4076
query_string = 0x67dec0 "SELECT '' AS to_char_6, to_char(val, 'FMS", '9' <repeats 16 times>, ".", '9' <repeats 15 times>, "') FROM num_data;"
firstchar = 6810320
input_message = {
data = 0x67dec0 "SELECT '' AS to_char_6, to_char(val, 'FMS", '9' <repeats 16 times>, ".", '9' <repeats 15 times>, "') FROM num_data;", len = 95, maxlen = 1024, cursor = 95}
local_sigjmp_buf = {{__jmpbuf = {-488613485, -488618077, 490879835}, __mask_was_saved = 1, __saved_mask = {
__val = {0, 0, 0, 0, 1882908820, 4287779072, 1879209388, 0, 0, 0, 1882908820, 1879054832, 1882055848, 4,
0, 0, 0, 0, 4287779152, 0, 0, 0, 0, 0, 0, 0, 0, 1498055587, 0, 0, 4294967295, 6052864}}}}
send_ready_for_query = 0 '\000'
disable_idle_in_transaction_timeout = 0 '\000'
__func__ = "PostgresMain"
#14 0x0006d6c8 in BackendRun (port=0x627398)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/postmaster/postmaster.c:4285
ac = 1
secs = 551370787
usecs = 396920
i = 1
av = 0x62da48
maxac = <optimized out>
#15 BackendStartup (port=0x627398)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/postmaster/postmaster.c:3959
bn = 0x10b3
pid = 0
#16 ServerLoop () at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/postmaster/postmaster.c:1715
port = 0x627398
rmask = {fds_bits = {16, 0 <repeats 31 times>}}
selres = <optimized out>
now = <optimized out>
readmask = {fds_bits = {16, 0 <repeats 31 times>}}
nSockets = 5
last_lockfile_recheck_time = 1498055585
last_touch_time = 1498055585
__func__ = "ServerLoop"
#17 0x0029ba3c in PostmasterMain (argc=8, argv=<optimized out>)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/postmaster/postmaster.c:1323
opt = <optimized out>
status = <optimized out>
userDoption = <optimized out>
listen_addr_saved = <optimized out>
i = <optimized out>
output_config_variable = <optimized out>
__func__ = "PostmasterMain"
#18 0x0006e6d8 in main (argc=8, argv=0x604af8)
at /home/turelto/src/tmp/postgresql-9.6-9.6.3/build/../src/backend/main/main.c:228
No locals.

A potentially similar issue was introduced in 9.4.7 and resolved in 9.4.8:

https://www.postgresql.org/message-id/20160413094117.GC21485@msg.credativ.de

I can test patches or provide more information.

Best regards,
Tom Turelinckx