[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: Bug: ptrace issues under x86_64 Xen kernel 2.6.29
Bryan Donlan wrote: On Sun, Mar 29, 2009 at 11:01 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:Bryan Donlan wrote:Using 2.6.29 or 2.6.28 as a 64-bit Xen domU, a number of ptrace() users seem to have issues with unexpected breakpoints. ltrace and gdb both seem to be affected, under both 64-bit and 32-bit userspace. 32-bit kernels do not seem to be affected. Typical symptoms look like:It looks like this is because the kernel sets up int3 (breakpoint) and debug (watchpoints, etc) to be on a separate debug stack in the tss. Xen doesn't do this (and doesn't appear to have a mechanism to do so), so I guess the on-stack format isn't what the kernel expects. Does the patch below work?Hi, Sorry for the late reply; this message never made it to my inbox for some reason... I did try the patch, and saw similar results to Mark; ptrace works, but lots of warnings: Thanks. Those warnings are harmless, but I have an updated version of the fix to suppress them in xen-tip/next. J _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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