On Sep 2 11:06, Pavel Fedin wrote: > Hello Corinna! > > > Try `bt' at this point. Maybe the backtrace shows something of > > interest. > > You haven't read the message completely. 'bt' cannot help since > there's no debug information for ntdll and gdb is unable to unwind > the stack correctly. > > > Apart from that, try the latest snapshot from > > https://cygwin.com/snapshots/ I converted the internal exception > > handling avoiding crashes from system functions to SEH. Perhaps the > > above doesn't show up with it. > > I have installed the snapshot, and looks like it's now stable. > However, this exception actually persists. I can tell you some more > details. The actual malfunction happens when this exception fires > twice in a row. I managed to catch this with strace a couple of > times, but didn't save logs unfortunately. > I want to try to bisect for the origin of this crash. Currently i > know that it happens before main(). But is main() a real entry point > ? I believe it's not. Can you tell me what is the real binary's entry > point in Cygwin ?
There are three entry points:
- init.cc, function dll_entry(), is called when the Cygwin DLL gets
initialized. This in turn calls dll_crt0_0() in which the real
action goes on. This function runs to completion right before your
exception, visible by the preceeding debug output
finished dll_crt0_0 initialization
- mainCRTStartup() in crt0.c, linked into the executable, is the "real"
entry point. From there it calls cygwin_crt0() in the statically
linked part of libcygwin.a, which calls _dll_crt0() in dcrt0.cc.
_dll_crt0 is now part of the DLL. It performs some basic
initialization and then calls (indirectly via _cygtls::call) the
function dll_crt0_1 in dcrt0.cc. This is where the second part of the
real action starts. From here it eventually calls the application's
main entry point.
- DllMain in lib/dll_entry.c, using the DECLARE_CYGWIN_DLL macro from
include/cygwin/cygwin_dll.h is the entry point for all cygwin-built
DLLs. Basically it calls cygwin_attach_dll in lib/cygwin_attach_dll.c,
which calls dll_dllcrt0 in dll_init.cc, which calls dll_dllcrt0_1 in
dll_init.cc. This function initializes the datastructures for
bookkeeping DLLs linked to or loaded by the application.
> Yesterday in the evening i replied from home with some more
> information, but my reply got lost again :(
Raw email address in your SIG again, perhaps?
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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