On Fri, 14 Mar 2008 18:48:15 -0700 (PDT) [EMAIL PROTECTED] wrote: > http://bugzilla.kernel.org/show_bug.cgi?id=10246 > > Summary: "in" after successful ioperm() results in SEGV after kvm > use > Product: Memory Management > Version: 2.5 > KernelVersion: 2.6.25-rc5 > Platform: All > OS/Version: Linux > Tree: Mainline > Status: NEW > Severity: normal > Priority: P1 > Component: Other > AssignedTo: [EMAIL PROTECTED] > ReportedBy: [EMAIL PROTECTED] > > > Latest working kernel version: N/A > Earliest failing kernel version: 2.6.24 > Distribution: Ubuntu, but tested with mainline > Hardware Environment: intel mobo, Intel(R) Core(TM)2 Quad CPU [EMAIL > PROTECTED] > Software Environment: kvm 62 (x86_64) > Problem Description: > > After a successful ioperm() call, otherwise valid "in" instructions will segv > if a kvm VM has started. > > Steps to reproduce: > > 1) run attached reproducer prior to starting a kvm VM, results are: > # ./ioperm > getting 0x3b4-0x3df permission... > fetching 0x3cc... > ok: 1 > > 2) start a kvm VM (bug exists only after actually starting a guest VM) > > 3) run reproducer, which now fails: > # ./ioperm > getting 0x3b4-0x3df permission... > fetching 0x3cc... > Segmentation fault (core dumped) > > Note that it does not always fail. Running within gdb seems to reduce the > chances that it will fail. But when it does, it is clearly the "in" that is > failing: > > Program received signal SIGSEGV, Segmentation fault. > 0x00000000004006e4 in inb () > (gdb) x/1i $pc > 0x4006e4 <inb+12>: in (%dx),%al > (gdb) info reg rdx > rdx 0x3cc 972 > > I have had the sense that running the CPUs at full load (niced) increases the > chance for failure. >
There is a testcase in the bugzilla report. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
