[Bug dynamic-link/21777] New: use of pthread_getspecific, pthread_setspecific in a statically linked program leads to a crash before main

["bruno at clisp dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21777

            Bug ID: 21777
           Summary: use of pthread_getspecific, pthread_setspecific in a
                    statically linked program leads to a crash before main
           Product: glibc
           Version: 2.23
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: bruno at clisp dot org
  Target Milestone: ---

Created attachment 10265
  --> https://sourceware.org/bugzilla/attachment.cgi?id=10265&action=edit
test program

The attached single-threaded program makes use of pthread_getspecific,
pthread_setspecific. When compiled without "-static", it works fine. When
compiled with "-static", it crashes before entering 'main'.

How to reproduce on x86_64:
$ gcc -Wall -O testfstrcmp.c -static -pthread
$ ./a.out 
Segmentation fault (core dumped)

It works when compiled without use of pthread_getspecific, pthread_setspecific:
$ gcc -Wall -O -DAVOID_PTHREAD_KEYS testfstrcmp.c -static -pthread
$ ./a.out 
>> main
<< main

Here's the stack trace:
$ gcc -Wall -O -ggdb testfstrcmp.c -static -pthread
$ gdb a.out
(gdb) run
Starting program: /tmp/a.out 

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) where
#0  0x0000000000000000 in ?? ()
#1  0x000000000049f426 in __register_frame_info.part.4 ()
#2  0x000000000040098d in frame_dummy ()
#3  0x0000000000402557 in __libc_csu_init ()
#4  0x0000000000401b6e in generic_start_main ()
#5  0x0000000000401dba in __libc_start_main ()
#6  0x00000000004008b9 in _start ()

I can also reproduce this crash for other CPUs, using qemu "user mode":

e.g. with mips:
$ mips-linux-gnu-gcc-5 -O -Wall -static testfstrcmp.c -pthread -o
testfstrcmp-mips
$ gdb ~/inst-qemu/2.9.0/bin/qemu-mips
(gdb) run testfstrcmp-mips
Thread 1 "qemu-mips" received signal SIGSEGV, Segmentation fault.
gen_intermediate_code (env=env@entry=0x555557a63f38,
tb=tb@entry=0x7ffff4d21c10) at
/media/develdata/devel/build/qemu-2.9.0/target/mips/translate.c:19962
19962               ctx.opcode = cpu_ldl_code(env, ctx.pc);

or with aarch64:
$ aarch64-linux-gnu-gcc-5 -O -Wall -static testfstrcmp.c -pthread -o
testfstrcmp-aarch64
$ gdb ~/inst-qemu/2.9.0/bin/qemu-aarch64
(gdb) run testfstrcmp-aarch64
Thread 1 "qemu-aarch64" received signal SIGSEGV, Segmentation fault.
0x00005555559c425b in static_code_gen_buffer ()

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