Ulrich, All, Using GDB, I figured out that the S0C4 is coming from the path_open routine of elf/dl-load.c in glibc. Is there any way to figure out which assembler instructions belong to wchich lines of C source code? I don't presume to be able to debug glibc, but at least I can try to get the glibc developers to look at the problem.
Mark Post -----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of Ulrich Weigand Sent: Sunday, September 24, 2006 5:56 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: OpenSSH Oddity Brad Hinson wrote: >Looking at arch/s390/kernel/traps.c, do_trap(), I bet interruption code >0x4 corresponds to EINTR 'interrupted system call'. Actually, it doesn't ;-) This code is what is called "program-interruption condition" in the the ESA/390 Principles of Operation, and code 4 corresponds to a "Protection Exception". This can be caused by a variety of conditions, but in Linux user space it always means your program tried to write to an read-only memory mapping. In this particular case we have a User PSW of 070dc000 c0006318, that is we wereexecuting the instruction at 0x40006318 (which tends to be within the main executable .text section); this instructions happened to be User Code: 50 00 70 00, i.e. st %r0, 0(%r7). Register %r7 contained 0x40016f3c, and this is confirmed by "failing address: 40016000" (note that the hardware reports the failing address only by page). Now it's hard to say where exactly the address 0x40016f3c points to, but it is low enough to have some likelyhood of also residing with the main executable's .text (or .rodata) section, which is generally mapped read-only. So the question is why the program tries to write to a read-only location. I'd recommend to use GDB to track this down further, either on the live process or else on a core dump. Mit freundlichen Gruessen / Best Regards Ulrich Weigand ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
