https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91992
Bug ID: 91992
Summary: gcc/testsuite/go/index0-out.x SEGV and spinlock during
testsuite run
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: msebor at gcc dot gnu.org
CC: cmang at google dot com
Target Milestone: ---
As discussed in https://gcc.gnu.org/ml/gcc/2019-09/msg00152.html,
gcc/testsuite/go/index0-out.x spins indefinitely during the testsuite run on
x86_64-linux running Fedora 30, preventing it from completing. One set of
backtraces was reported here:
https://gcc.gnu.org/ml/gcc/2019-09/msg00185.html
The two stack traces I have seen are in my recent build are:
Thread 1 "index0-out.x" received signal SIGSEGV, Segmentation fault.
merge_dynamic_blocks (b=0x1680600, a=0x80)
at /ssd/test/src/gcc/91977/libgcc/generic-morestack.c:420
420 for (pp = &a->next; *pp != NULL; pp = &(*pp)->next)
(gdb) bt
#0 merge_dynamic_blocks (b=0x1680600, a=0x80)
at /ssd/test/src/gcc/91977/libgcc/generic-morestack.c:420
#1 __morestack_release_segments (free_dynamic=<optimized out>,
pp=<optimized out>)
at /ssd/test/src/gcc/91977/libgcc/generic-morestack.c:455
#2 __generic_morestack (pframe_size=0x7ffff2d485a0, old_stack=0x7ffff2d485c0,
param_size=0) at /ssd/test/src/gcc/91977/libgcc/generic-morestack.c:546
#3 0x00007ffff77934d8 in __morestack ()
at /ssd/test/src/gcc/91977/libgcc/config/i386/morestack.S:512
#4 0x00007ffff72023b0 in __go_get_backtrace_state ()
at /ssd/test/src/gcc/91977/libgo/runtime/go-caller.c:107
#5 0x00007ffff7202b9e in runtime_callers (skip=skip@entry=2,
locbuf=locbuf@entry=0xc000046948, m=m@entry=32,
keep_thunks=keep_thunks@entry=false)
at /ssd/test/src/gcc/91977/libgo/runtime/go-callers.c:208
#6 0x00007ffff767fcee in runtime.callers (locbuf=..., locbuf=..., skip=1)
at /ssd/test/src/gcc/91977/libgo/go/runtime/traceback_gccgo.go:60
#7 runtime.mcommoninit (mp=mp@entry=0xc000046800)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:614
#8 0x00007ffff7689eaa in runtime.allocm (_p_=_p_@entry=0xc00001c500,
fn=<optimized out>, allocatestack=allocatestack@entry=false)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1511
#9 0x00007ffff768a348 in runtime.newm (
fn=fn@entry=0x7ffff7b58fb8 <runtime.mspinning..f>,
_p_=_p_@entry=0xc00001c500)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1818
#10 0x00007ffff768a684 in runtime.startm (_p_=0xc00001c500, _p_@entry=0x0,
spinning=spinning@entry=true)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1967
#11 0x00007ffff768b67c in runtime.wakep ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:2048
#12 0x00007ffff768df88 in __go_go (fn=fn@entry=140737344200784,
arg=arg@entry=0x0) at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:3232
#13 0x00007ffff764f148 in runtime.runtime..init3 ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:275
#14 0x00007ffff769b955 in runtime..import ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:273
#15 0x000000000055c10a in main.init () at ./index0-out.go:5
#16 0x000000000055c7fc in __morestack ()
at /ssd/test/src/gcc/91977/libgcc/config/i386/morestack.S:546
#17 0x00007ffff768e2df in runtime.main (p.0=<optimized out>)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:218
#18 0x00007ffff7688ee8 in runtime.kickoff ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1213
#19 0x0000000000000000 in ?? ()
and
Thread 1 "index0-out.x" received signal SIGSEGV, Segmentation fault.
0x00007ffff7fdbfa2 in do_lookup_x () from /lib64/ld-linux-x86-64.so.2
(gdb) bt
#0 0x00007ffff7fdbfa2 in do_lookup_x () from /lib64/ld-linux-x86-64.so.2
#1 0x00007ffff7fdcbcf in _dl_lookup_symbol_x ()
from /lib64/ld-linux-x86-64.so.2
#2 0x00007ffff7fe1544 in _dl_fixup () from /lib64/ld-linux-x86-64.so.2
#3 0x00007ffff7fe829e in _dl_runtime_resolve_xsavec ()
from /lib64/ld-linux-x86-64.so.2
#4 0x00007ffff72023b0 in __go_get_backtrace_state ()
at /ssd/test/src/gcc/91977/libgo/runtime/go-caller.c:107
#5 0x00007ffff7202b9e in runtime_callers (skip=skip@entry=2,
locbuf=locbuf@entry=0xc000046948, m=m@entry=32,
keep_thunks=keep_thunks@entry=false)
at /ssd/test/src/gcc/91977/libgo/runtime/go-callers.c:208
#6 0x00007ffff767fcee in runtime.callers (locbuf=..., locbuf=..., skip=1)
at /ssd/test/src/gcc/91977/libgo/go/runtime/traceback_gccgo.go:60
#7 runtime.mcommoninit (mp=mp@entry=0xc000046800)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:614
#8 0x00007ffff7689eaa in runtime.allocm (_p_=_p_@entry=0xc00001c500,
fn=<optimized out>, allocatestack=allocatestack@entry=false)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1511
#9 0x00007ffff768a348 in runtime.newm (
fn=fn@entry=0x7ffff7b58fb8 <runtime.mspinning..f>,
_p_=_p_@entry=0xc00001c500)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1818
#10 0x00007ffff768a684 in runtime.startm (_p_=0xc00001c500, _p_@entry=0x0,
spinning=spinning@entry=true)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1967
#11 0x00007ffff768b67c in runtime.wakep ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:2048
#12 0x00007ffff768df88 in __go_go (fn=fn@entry=140737344200784,
arg=arg@entry=0x0) at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:3232
#13 0x00007ffff764f148 in runtime.runtime..init3 ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:275
#14 0x00007ffff769b955 in runtime..import ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:273
#15 0x000000000055c10a in main.init () at ./index0-out.go:5
#16 0x000000000055c7fc in __morestack ()
at /ssd/test/src/gcc/91977/libgcc/config/i386/morestack.S:546
#17 0x00007ffff768e2df in runtime.main (p.0=<optimized out>)
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:218
#18 0x00007ffff7688ee8 in runtime.kickoff ()
at /ssd/test/src/gcc/91977/libgo/go/runtime/proc.go:1213
#19 0x0000000000000000 in ?? ()
