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From: "slyfox at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/97461] [11 Regression] allocate_gcov_kvp()
 deadlocks in firefox LTO+PGO build (overridden malloc() recursion)
Date: Thu, 29 Oct 2020 14:53:24 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97461

--- Comment #15 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
allocate_gcov_kvp() gets called 89 times. Tried as:

$ gdb --quiet --args dist/firefox/fire
fox 'data:text/html,<script>Quitter.quit()</script>' -profile
../../firefox-82.0/temp/tmpzhv0a26v
(gdb) break allocate_gcov_kvp
Breakpoint 1 at 0x1507b0: allocate_gcov_kvp. (4 locations)
(gdb) ignore 1 999999
Will ignore next 999999 crossings of breakpoint 1.
(gdb) continue
The program is not being run.
(gdb) run
^C
Thread 1 "firefox" received signal SIGINT, Interrupt.
__lll_lock_wait (futex=3D0x7ffff7800018, private=3D0) at lowlevellock.c:52
(gdb) info breakpoints
Num     Type           Disp Enb Address            What
1       breakpoint     keep y   <MULTIPLE>
        breakpoint already hit 89 times
        ignore next 999910 hits=