Hi,

I changed the flags of dlopen in dynlib.c:

dynlib_handle_ptr
dynlib_open (const char *path)
{
  // return dlopen (path, RTLD_LAZY);



  return dlopen (path, RTLD_LAZY|RTLD_GLOBAL);
}

then my dynamic module can load other .so in emacs-27.

but it make gccemacs-28 crash:

$ /usr/src/emacs/src/emacs -nw -q
Fatal error 11: Segmentation fault
Backtrace:
/usr/src/emacs/src/emacs(+0x1c4c13)[0x558a8d05fc13]
/usr/src/emacs/src/emacs(+0x199a0e)[0x558a8d034a0e]
/usr/src/emacs/src/emacs(+0x1c44d8)[0x558a8d05f4d8]
/usr/src/emacs/src/emacs(+0x1c44ad)[0x558a8d05f4ad]
/usr/src/emacs/src/emacs(+0x1c4513)[0x558a8d05f513]
/usr/src/emacs/src/emacs(+0x1c46ab)[0x558a8d05f6ab]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x14140)[0x7f3bba1a4140]
/usr/src/emacs/src/emacs(+0x2b60b6)[0x558a8d1510b6]
/home/silent/.emacs.d/eln-cache/28.0.90-8dcada16/cconv-3b1f1f98-cca24f72.eln(top_level_run+0x87)[0x7f3bb37045a7]
/usr/src/emacs/src/emacs(+0x2b5d18)[0x558a8d150d18]
/usr/src/emacs/src/emacs(+0x2b6830)[0x558a8d151830]