https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77538
--- Comment #2 from peien luo <coollpe at hotmail dot com> --- (In reply to Dmitry Vyukov from comment #1) > Hello, > > Shadow stack size was increased several times, and as far as I remember we > now have a guard page at the end. Please retest with latest gcc/clang, or > provide a reproducer. I moved to another box (a virtual machine) to test the new gcc 4.9.4 (because the other environment is a shared server I can't make many changes on it.) What I observed is: without tsan, the process runs fine. With tsan turned on, then it got fully stuck at some point. (D state, cannot attach or trace). I haven't yet figured out what caused that. Here is a /proc stack when it got stuck: $ cat syscall 35 0x7ffca05f77e0 0x7ffca05f77e0 0x0 0x8 0x7ffca05f78f0 0x7ffca05f7730 0x7ffca05f77d0 0x7f24ff6f349d $ cat stack [<ffffffff81081504>] do_exit+0x1e4/0xa60 [<ffffffff81081dff>] do_group_exit+0x3f/0xa0 [<ffffffff81092c10>] get_signal_to_deliver+0x1d0/0x6d0 [<ffffffff81014417>] do_signal+0x57/0x6c0 [<ffffffff81014adf>] do_notify_resume+0x5f/0xb0 [<ffffffff8164617d>] int_signal+0x12/0x17 [<ffffffffffffffff>] 0xffffffffffffffff
