Jeff Dike wrote: > On Wed, Oct 18, 2006 at 09:16:14PM +0200, Jan Dittmer wrote: >> This is 100% reproducible here. Perfect test case. How to debug? > > You want to dig into the code and see what's wrong? Put a breakpoint > on the force_sig_info(SIGSEGV, ...) in segv(). Then find the faulting > instruction - > RIP is regs.skas.regs[16] > pid = cpu_tasks[0].pid > Look in the host's /proc/$pid/maps for the page containing RIP > add uml_physmem to the offset in column 3 - that's the > physical page containing RIP > add the RIP page offset to that to get the actual physical > address for RIP > disassemble the range of memory around it - I usually do 10 - > 20 bytes before it to ~10 bytes after > see that the asm looks sane, if not, bump the start of the > disassembly by a byte in either direction until it does > see what the instruction at RIP is - if it involves a gs: > reference, then it's very likely a NPTL problem
Well tomorrow perhaps. I've very little time currently :-( > If you don't want to do that, tell me what to yum, and how to run > whatever it is, and I'll look at it. As I wrote in the original message: Debian/etch amd64 host+guest, running btlaunchmany (from the bittorrent package). I can put you the compressed root + kernel somewhere if that helps. It's roughly 100mb. Jan ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
