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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug gcov-profile/49484] gcov crash if two(or more) forks happen at the same time Date: Tue, 17 Jan 2012 14:28:00 -0000 [thread overview] Message-ID: <bug-49484-4-b7xUETJ9O3@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-49484-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49484 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2012-01-17 Ever Confirmed|0 |1 --- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-01-17 13:50:49 UTC --- Confirmed with the testcase in the RH bugzilla. I'm not sure why the issue does not reproduce with GCC 4.4 and up (I can't see changes in libgcov). But I can fix the issue by making the fcntl file locking effective for threads with Index: gcc/gcov-io.c =================================================================== --- gcc/gcov-io.c (revision 183243) +++ gcc/gcov-io.c (working copy) @@ -32,6 +32,10 @@ static const gcov_unsigned_t *gcov_read_ static void gcov_allocate (unsigned); #endif +#if GCOV_LOCKED +#include <sys/syscall.h> +#endif + static inline gcov_unsigned_t from_file (gcov_unsigned_t value) { #if !IN_LIBGCOV @@ -70,9 +74,13 @@ gcov_open (const char *name, int mode) s_flock.l_whence = SEEK_SET; s_flock.l_start = 0; s_flock.l_len = 0; /* Until EOF. */ +#ifdef SYS_gettid + s_flock.l_pid = syscall(SYS_gettid); +#else s_flock.l_pid = getpid (); #endif - +#endif + gcc_assert (!gcov_var.file); gcov_var.start = 0; gcov_var.offset = gcov_var.length = 0;
next prev parent reply other threads:[~2012-01-17 13:51 UTC|newest] Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-06-21 9:05 [Bug gcov-profile/49484] New: " cobexer at gmail dot com 2011-06-21 9:24 ` [Bug gcov-profile/49484] " mikpe at it dot uu.se 2011-06-24 9:34 ` cobexer at gmail dot com 2011-10-07 12:13 ` vijay910 at gmail dot com 2012-01-17 14:28 ` rguenth at gcc dot gnu.org [this message] 2012-01-17 15:21 ` rguenth at gcc dot gnu.org 2012-01-17 15:26 ` rguenth at gcc dot gnu.org 2012-01-17 15:43 ` rguenth at gcc dot gnu.org 2012-01-18 10:57 ` rguenth at gcc dot gnu.org 2012-01-18 11:51 ` jakub at gcc dot gnu.org 2012-01-18 12:03 ` rguenth at gcc dot gnu.org 2012-01-18 13:30 ` rguenth at gcc dot gnu.org 2012-01-18 13:44 ` rguenth at gcc dot gnu.org 2012-01-18 13:48 ` jakub at gcc dot gnu.org 2012-01-18 17:14 ` rguenth at gcc dot gnu.org 2012-03-12 14:23 ` rguenth at gcc dot gnu.org 2012-03-12 14:26 ` rguenth at gcc dot gnu.org 2012-03-12 15:01 ` redi at gcc dot gnu.org 2012-03-12 15:07 ` redi at gcc dot gnu.org 2012-03-12 15:10 ` redi at gcc dot gnu.org 2012-03-12 15:29 ` rguenth at gcc dot gnu.org 2012-03-12 15:52 ` rguenth at gcc dot gnu.org 2012-03-12 15:55 ` redi at gcc dot gnu.org 2012-03-12 16:00 ` redi at gcc dot gnu.org 2012-03-12 16:03 ` rguenther at suse dot de 2012-05-01 21:23 ` asharif at gcc dot gnu.org 2012-05-02 22:52 ` asharif at gcc dot gnu.org 2012-12-06 20:10 ` asharif at gcc dot gnu.org 2012-12-07 2:36 ` asharif at gcc dot gnu.org
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