On Monday 21 November 2005 17:38, Rob Landley wrote: > On Monday 21 November 2005 08:58, Jeff Dike wrote: > > On Sat, Nov 19, 2005 at 02:11:50PM +0100, Joel Palmius wrote: > > > * SKAS0 mode, crash: > > ... > > > > Kernel panic - not syncing: copy_context_skas0 : failed to wait for > > > SIGUSR1/SIGTRAP, pid = 11008, n = 11008, errno = 0, status = 0xb7f > > > > Can you send a disassembly of stub_clone_handler? > > > > Jeff > > I'll see this crash and raise you. I just tried vanilla 2.6.15-rc2, and > although it booted to a shell it crashed with the first command I ran. > (This is my x86 laptop, built under ubuntu with gcc 3.3.5). Dump and > dissassemblies follow.
Ok, below is the likely failure point. From reading the code, I guess that this register is EIP, and that the disassembly is on not relocated code (the last 3 digits match): 12 - bfffe08d > 8113080: 55 push %ebp > 8113081: 89 c5 mov %eax,%ebp > 8113083: b8 c0 00 00 00 mov $0xc0,%eax > 8113088: cd 80 int $0x80 > 811308a: 5d pop %ebp By memory we have remapped the stack > 811308b: 89 c7 mov %eax,%edi Ok, this instruction seems the failing one. However, I really wonder why it should fail - there is no "normal" reason for the failure, at least for what I see. What makes me think is: the kernel doesn't accept stack faults below $esp - 32 - that's called "a bug" by sources. This shouldn't be considered as a stack, but who knows. > 811308d: 89 7d 18 mov %edi,0x18(%ebp) > 8113090: cc int3 The below can be considered random crap - we stop here. > 8113091: 8b 5c 24 04 mov 0x4(%esp),%ebx > 8113095: 8b 74 24 08 mov 0x8(%esp),%esi > 8113099: 8b 7c 24 0c mov 0xc(%esp),%edi > 811309d: 8b 6c 24 10 mov 0x10(%esp),%ebp > 81130a1: 83 c4 14 add $0x14,%esp > 81130a4: c3 ret > 081130b0 <stub_segv_handler>: This one looks ok from _this_ point of view. -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894) http://www.user-mode-linux.org/~blaisorblade ___________________________________ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it ------------------------------------------------------- This SF.Net email is sponsored by the JBoss Inc. Get Certified Today Register for a JBoss Training Course. Free Certification Exam for All Training Attendees Through End of 2005. For more info visit: http://ads.osdn.com/?ad_idv28&alloc_id845&op=click _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
