https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235751
Bug ID: 235751
Summary: Failure to init TLS variables with func ptr inside
shared lib
Product: Base System
Version: 12.0-RELEASE
Hardware: powerpc
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
This is the exact same problem as described in Bug 161344.
Re-discovered this because libmpfr 4.0.2 fails most of its
tests unless one disables thread local storage.
hydra$ uname -a
FreeBSD hydra 12.0-RELEASE FreeBSD 12.0-RELEASE r341666 GENERIC powerpc
hydra$ echo $CC
/usr/local/bin/gcc8
hydra$ echo $CFLAGS
-g -m64 -std=c99 -fno-builtin -O0 -mcpu=970 -mcall-freebsd -mno-altivec
-mno-float128 -mno-float128-hardware -mfull-toc -mregnames
-fno-unsafe-math-optimizations
hydra$ cat -n t1.c
1
2 int f(int x) {
3 return x;
4 }
5 struct s_t {
6 int (*func)(int);
7 };
8 struct s_t __thread x = { f };
9
10
hydra$
hydra$ cat -n t2.c
1
2
3 struct s_t {
4 int (*func)(int);
5 };
6 extern struct s_t __thread x;
7 int main(int argc, const char *argv[]) {
8 return (*x.func)(argc);
9 }
10
hydra$
hydra$ $CC $CFLAGS -shared -o t1.so -fPIC t1.c
hydra$ $CC $CFLAGS -o foo t2.c t1.so
hydra$ LD_LIBRARY_PATH=. ./foo
Segmentation fault (core dumped)
hydra$
hydra$ gdb foo foo.core
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Reading symbols from foo...done.
[New LWP 100253]
Core was generated by `./foo'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000000010000a1c in main (argc=1, argv=0x3fffffffffffd7f0) at t2.c:8
8 return (*x.func)(argc);
(gdb) where
#0 0x0000000010000a1c in main (argc=1, argv=0x3fffffffffffd7f0) at t2.c:8
(gdb) list
3 struct s_t {
4 int (*func)(int);
5 };
6 extern struct s_t __thread x;
7 int main(int argc, const char *argv[]) {
8 return (*x.func)(argc);
9 }
10
(gdb) quit
However the problem goes away entirely with r344130.
Also tested the situation with mpfr 4.0.2 and TLS seems to work with r344130.
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