Re: Heads up: libffi 3.4 rebuild in rawhide today

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I wish I had answers for you.

Nevertheless, I'd help if I knew how to debug the detached children after fork, because they are failing earlier then the main process. I was using `set follow-fork-mode child` but that does nothing :/

I think that exec or fork is the culprit, in some way.


Vít


Dne 11. 01. 22 v 22:41 Carlos O'Donell napsal(a):
On 1/11/22 13:45, Vít Ondruch wrote:
Thread 1 "ruby" received signal SIGABRT, Aborted.
0x00007ffff78a764c in __pthread_kill_implementation () from /lib64/libc.so.6
Missing separate debuginfos, use: dnf debuginfo-install glibc-2.34.9000-36.fc36.x86_64 gmp-6.2.1-1.fc36.x86_64 libxcrypt-4.4.27-1.fc36.x86_64 zlib-1.2.11-30.fc35.x86_64
(gdb) bt
#0  0x00007ffff78a764c in __pthread_kill_implementation () from /lib64/libc.so.6
#1  0x00007ffff785a656 in raise () from /lib64/libc.so.6
#2  0x00007ffff7844833 in abort () from /lib64/libc.so.6
#3  0x00007ffff4d0a5b8 in dlfree (mem=0x7ffff7bf1010) at ../src/dlmalloc.c:4350
This is libffi's internal allocator detecting an inconsistency.

#4  0x00007ffff4d190b1 in dealloc (ptr=0x5555558c1c00) at /builddir/build/BUILD/ruby-3.1.0/ext/fiddle/closure.c:32
This is fiddle calling ffi_closure_free() because USE_FFI_CLOSURE_ALLOC is non-zero.

The original closure was allocated in allocate() in fiddle.

What happened to the closure between allocation and free?

Does the memory location change?

Does something corrupt the closure?

#5  0x00007ffff7cb7801 in run_final (zombie=140737300557440, objspace=0x55555555d800) at /builddir/build/BUILD/ruby-3.1.0/gc.c:4011
#6  finalize_list (objspace=objspace@entry=0x55555555d800, zombie=140737300557440) at /builddir/build/BUILD/ruby-3.1.0/gc.c:4030
#7  0x00007ffff7cb80cc in rb_objspace_call_finalizer (objspace=0x55555555d800) at /builddir/build/BUILD/ruby-3.1.0/gc.c:4194
#8  0x00007ffff7ca56eb in rb_ec_finalize (ec=0x55555555dd70) at /builddir/build/BUILD/ruby-3.1.0/eval.c:164
#9  rb_ec_cleanup (ec=ec@entry=0x55555555dd70, ex0=<optimized out>) at /builddir/build/BUILD/ruby-3.1.0/eval.c:256
#10 0x00007ffff7ca5c14 in ruby_run_node (n=0x7ffff7699660) at /builddir/build/BUILD/ruby-3.1.0/eval.c:321
#11 0x000055555555518f in main (argc=<optimized out>, argv=<optimized out>) at ./main.c:47
(gdb) f 3
#3  0x00007ffff4d0a5b8 in dlfree (mem=0x7ffff7bf1010) at ../src/dlmalloc.c:4350
4350          USAGE_ERROR_ACTION(fm, p);
We only get here when the incoming pointer is invalid.

(gdb) l
4345              check_free_chunk(fm, p);
4346              goto postaction;
4347            }
4348          }
4349        erroraction:
4350          USAGE_ERROR_ACTION(fm, p);
4351        postaction:
4352          POSTACTION(fm);
4353        }
4354      }

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