Segfault bootstrapping on aarch64 #1931
Description
After bootstrapping successfully from the latest ltsmaster on debian/arm64 (unstable), I tried to build the latest 1.1.0+b6 package. Tried with both llvm-3.8 (default for the package) and llvm-3.9 (in case it contained fixes for arm64), bootstrap fails eventually at this point:
# cd /root/ldc-1.1.0+b6 && /root/ldc-1.1.0+b6/build-static/bin/ldc2 --output-o -c -I/root/ldc-1.1.0+b6/runtime/druntime/src -I/root/ldc-1.1.0+b6/runtime/druntime/src/gc /root/ldc-1.1.0+b6/runtime/phobos/std/array.d -of/root/ldc-1.1.0+b6/build-static/runtime/std/array-debug.o -g -link-debuglib -I/root/ldc-1.1.0+b6/runtime/phobos -v-cg
0 libLLVM-3.9.so.1 0x0000ffff7f580f44 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 52
Segmentation fault
root@sirius:~/ldc-1.1.0+b6# gdb /root/ldc-1.1.0+b6/build-static/bin/ldc2
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Reading symbols from /root/ldc-1.1.0+b6/build-static/bin/ldc2...done.
(gdb) run --output-o -c -I/root/ldc-1.1.0+b6/runtime/druntime/src -I/root/ldc-1.1.0+b6/runtime/druntime/src/gc /root/ldc-1.1.0+b6/runtime/phobos/std/array.d -of/root/ldc-1.1.0+b6/build-static/runtime/std/array-debug.o -g -link-debuglib -I/root/ldc-1.1.0+b6/runtime/phobos
Starting program: /root/ldc-1.1.0+b6/build-static/bin/ldc2 --output-o -c -I/root/ldc-1.1.0+b6/runtime/druntime/src -I/root/ldc-1.1.0+b6/runtime/druntime/src/gc /root/ldc-1.1.0+b6/runtime/phobos/std/array.d -of/root/ldc-1.1.0+b6/build-static/runtime/std/array-debug.o -g -link-debuglib -I/root/ldc-1.1.0+b6/runtime/phobos
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/aarch64-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
_IO_vsnprintf (string=0xaaaaab009360 "", maxlen=<optimized out>, format=0xaaaaaae92157 "__unittestL%u_", args=<error reading variable: Cannot access memory at address 0x111>) at vsnprintf.c:114
114 vsnprintf.c: No such file or directory.
(gdb) where
#0 _IO_vsnprintf (string=0xaaaaab009360 "", maxlen=<optimized out>, format=0xaaaaaae92157 "__unittestL%u_", args=<error reading variable: Cannot access memory at address 0x111>) at vsnprintf.c:114
#1 0x0000aaaaaacbf248 in OutBuffer::vprintf(char const*, std::__va_list) ()
#2 0x0000aaaaaac389bc in OutBuffer::printf(char const*, ...) ()
#3 0x0000aaaaaad0bd40 in unitTestId(Loc) ()
#4 0x0000aaaaaac263c0 in ddmd.parse.Parser.parseDeclDefs(int, ddmd.dsymbol.Dsymbol*, ddmd.parse.PrefixAttributes*) ()
#5 0x0000aaaaaac2538c in ddmd.parse.Parser.parseDeclDefs(int, ddmd.dsymbol.Dsymbol*, ddmd.parse.PrefixAttributes*) ()
#6 0x0000aaaaaac2538c in ddmd.parse.Parser.parseDeclDefs(int, ddmd.dsymbol.Dsymbol*, ddmd.parse.PrefixAttributes*) ()
#7 0x0000aaaaaac2538c in ddmd.parse.Parser.parseDeclDefs(int, ddmd.dsymbol.Dsymbol*, ddmd.parse.PrefixAttributes*) ()
#8 0x0000aaaaaac93008 in ddmd.parse.Parser.parseModule() ()
#9 0x0000aaaaaac916cc in Module::parse() ()
#10 0x0000aaaaaad302e8 in mars_mainBody(Array<char const*>&, Array<char const*>&) ()
#11 0x0000aaaaaae2d49c in cppmain (argc=<optimized out>, argv=<optimized out>) at ./driver/main.cpp:1101
#12 0x0000aaaaaae77dac in rt.dmain2._d_run_main(int, char**, extern(C) int(char[][]) function).runAll().__lambda1() ()
#13 0x0000aaaaaae77d64 in rt.dmain2._d_run_main(int, char**, extern(C) int(char[][]) function).tryExec(scope void() delegate) ()
#14 0x0000aaaaaae77c68 in _d_run_main ()
#15 0x0000ffffb5506364 in __libc_start_main (main=0x0, argc=0, argv=0x0, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=<optimized out>) at libc-start.c:291
#16 0x0000aaaaaabf4238 in _start ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)