When using uclibc-0.9.33.2-r4, r5 or r6 with nptl, static applications will segfault on exit. It seems to be related to pthread_exit () which causes siglongjmp to go to NULL. I've attached a sample I found on the net to reproduce the problem. [code]gcc -o detached -pthread detached.c ./detached Main: creating thread Thread starting... Thread done. Main: program completed. Exiting # Now static gcc -o detached -pthread -static -ggdb detached.c ./detached Main: creating thread Thread starting... Thread done. Segmentation fault # Backtrace #0 0x00000000 in ?? () #1 0x0804bdf5 in siglongjmp () #2 0x0804a46d in ?? () #3 0x08055384 in _Unwind_ForcedUnwind_Phase2 () #4 0x080559ab in _Unwind_ForcedUnwind () #5 0x0804a4fd in __pthread_unwind () #6 0x0804a52a in pthread_exit () #7 0x08048aab in doWork (t=0x0) at detached.c:25 #8 0x080498eb in ?? () #9 0x0804a7e6 in clone ()[/code] I tried the following patch: http://git.uclibc.org/uClibc/commit/libpthread?id=23691332c8458adb469ad78051493ef0db434222 [code]diff --git a/libpthread/nptl/pthread_exit.c b/libpthread/nptl/pthread_exit.c index b37be7a..141ca75 100644 --- a/libpthread/nptl/pthread_exit.c +++ b/libpthread/nptl/pthread_exit.c @@ -29,3 +29,9 @@ __pthread_exit (void* value) __do_cancel (); } strong_alias (__pthread_exit, pthread_exit) + +/* + * After a thread terminates, __uClibc_main decrements __nptl_nthreads + * defined in pthread_create.c. + */ +PTHREAD_STATIC_FN_REQUIRE (pthread_create)[/code] But it doesn't seem to fix it. I also tried to disable: UCLIBC_DYNAMIC_ATEXIT Which according to the Config.in: [code]When this option is enabled, uClibc will support an infinite number, of atexit() and on_exit() functions, limited only by your available memory. This can be important when uClibc is used with C++, since global destructors are implemented via atexit(), and it is quite possible to exceed the default number when this option is disabled. Enabling this option adds a few bytes, and more significantly makes atexit and on_exit depend on malloc, which can be bad when compiling static executables. Unless you use uClibc with C++, you should probably answer N.[/code] But still the problem exists when compiling static binaries using pthread. The same happens when compiling busybox statically for use with iniramfs. Each applets works correctly, but segfaults on exit (spamming my dmesg during booting).
Created attachment 362738 [details] Sample for testing
sys-libs/uclibc has been removed from the tree, replaced by sys-libs/uclibc-ng. if this is still a problem on uclibc-ng, please open a new bug.
