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Postings from June 2019
On Wed, 05 Jun 2019 14:22:10 GMT, hv wrote:
> On Wed, 05 Jun 2019 06:32:12 -0700, jkeenan wrote:
> > I'm not sure whether you wanted *me* to run the above commands prior
> > to hearing from someone about mutexes
>
> I had not expected it would work, but since it did let's go with it.
> :) (For me that just gives 'No symbol "PL_locale_mutex" in current
> context'.)
>
> > here's what I got:
> >
> > #####
> > [perl] $ gdb --args ./perl -e 'my $x = sprintf("%7000000000E", 0)'
> [...]
> > Watchpoint 2: PL_locale_mutex
> >
> > Old value = 0x0
> > New value = 0x801e1c1e0
> > 0x0000000800c6caec in __pthread_mutex_init (mutex=0xa45b28,
> > mutex_attr=<value optimized out>) at pthread_md.h:94
>
> That's slightly odd, the intent of the tbreak was to get past the
> initialize (which the stack trace shows is invoked from
> perlmain.c:119). Never mind, please get to this point again, then
> continue with:
>
> (gdb) cont
>
> .. and let's see where it stops next, and get another stack trace.
>
> Hugo
After 'cont', the program hung for > 1 minute, so I Ctrl-C-ed it.
#####
...
Watchpoint 2: PL_locale_mutex
Watchpoint 2: PL_locale_mutex
Old value = 0x0
New value = 0x801e1c1e0
0x0000000800c6caec in __pthread_mutex_init (mutex=0xa45b28,
---Type <return> to continue, or q <return> to quit---
mutex_attr=<value optimized out>) at pthread_md.h:94
94 {
Current language: auto; currently minimal
(gdb) cont
Continuing.
^C
Program received signal SIGINT, Interrupt.
__vdso_gettc (th=0x7ffffffff270, tc=0x7fffffffe53c) at cpufunc.h:326
326 __asm __volatile("lfence" : : : "memory");
(gdb) bt
#0 __vdso_gettc (th=0x7ffffffff270, tc=0x7fffffffe53c) at cpufunc.h:326
#1 0x000000080183e729 in binuptime (bt=0x7fffffffe580, tk=0x7ffffffff1b0,
abs=1) at /usr/src/lib/libc/sys/__vdso_gettimeofday.c:43
#2 0x000000080183e818 in __vdso_clock_gettime (clock_id=13, ts=0x7fffffffe5e8)
at /usr/src/lib/libc/sys/__vdso_gettimeofday.c:149
#3 0x0000000801827a31 in __clock_gettime (clock_id=13, ts=0x7fffffffe5e8)
at /usr/src/lib/libc/sys/clock_gettime.c:46
#4 0x00000008018271da in time (t=0x801e225a8)
at /usr/src/lib/libc/gen/time.c:45
#5 0x000000000044fd6f in perl_parse (my_perl=0x801e22000,
xsinit=0x421490 <xs_init>, argc=<value optimized out>, argv=0x306,
env=<value optimized out>) at perl.c:1822
#6 0x00000000004213ea in main (argc=<value optimized out>,
argv=<value optimized out>, env=0x7fffffffe7a0) at perlmain.c:126
#####
--
James E Keenan (jkeenan@cpan.org)
---
via perlbug: queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=134172
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