Description of problem: vcpu hung in a loop: crash> bt PID: 25723 TASK: ffff81081e66f040 CPU: 5 COMMAND: "qemu-kvm" #0 [ffff8107b2bc7a48] schedule at ffffffff80063f96 #1 [ffff8107b2bc7b20] __cond_resched at ffffffff8008f9cb #2 [ffff8107b2bc7b30] cond_resched at ffffffff800640cb #3 [ffff8107b2bc7b40] gfn_to_pfn at ffffffff8836d03d #4 [ffff8107b2bc7b70] gfn_to_page at ffffffff8836ee5b #5 [ffff8107b2bc7b80] paging64_cmpxchg_gpte at ffffffff88377c46 #6 [ffff8107b2bc7ba0] paging64_walk_addr at ffffffff88379a8b #7 [ffff8107b2bc7c10] paging64_gva_to_gpa at ffffffff8837a2e3 #8 [ffff8107b2bc7cb0] emulator_write_emulated_onepage at ffffffff883710e9 #9 [ffff8107b2bc7cf0] x86_emulate_insn at ffffffff8837f380 #10 [ffff8107b2bc7da0] emulate_instruction at ffffffff88370f81 #11 [ffff8107b2bc7de0] kvm_arch_vcpu_ioctl_run at ffffffff88373861 #12 [ffff8107b2bc7e20] kvm_vcpu_ioctl at ffffffff8836f0ec #13 [ffff8107b2bc7eb0] do_ioctl at ffffffff80042489 #14 [ffff8107b2bc7ed0] vfs_ioctl at ffffffff800304d6 #15 [ffff8107b2bc7f40] sys_ioctl at ffffffff8004cbb7 #16 [ffff8107b2bc7f80] tracesys at ffffffff8005e28d (via system_call) RIP: 0000003d290cc647 RSP: 0000000041a88f58 RFLAGS: 00000246 Version-Release number of selected component (if applicable): kmod-kvm-83-164.el5 How reproducible: ? Steps to Reproduce: 1. No 2. Idea Actual results: Guest spinning, host task unkillable. Expected results: All is well. Additional info:
*** Bug 585951 has been marked as a duplicate of this bug. ***
using steps in bug 585951#c0 reproduced bug on kvm-83-164.el5. (AMD host, w/o npt) verified in kvm-83-181.el5
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2011-0028.html