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Re: port-xen/45975 (panic: HYPERVISOR_mmu_update failed, ret: -22 during heavy activity)

The following reply was made to PR port-xen/45975; it has been noted by GNATS.

From: Jeff Rizzo <>
Subject: Re: port-xen/45975 (panic: HYPERVISOR_mmu_update failed, ret: -22
 during heavy activity)
Date: Sun, 12 Feb 2012 15:45:28 -0800

 On 2/12/12 11:20 AM, wrote:
 > Please test the patch; I tested it succesfully on aXen 3.3 install
 > with amd64 and i386 domUs.
 I just got the panic on a Xen 4.1.2 domU with a 4 vcpu domU (4 physical 
 cores with 2 threads per core on the hardware) while testing the patch:
 panic: HYPERVISOR_mmu_update failed, ret: -22
 fatal breakpoint trap in supervisor mode
 trap type 1 code 0 rip ffffffff80134665 cs e030 rflags 246 cr2  
 7f7ff7e12000 cpl 6 rsp ffffa000b423dea0
 Stopped in pid 765.1 (sh) at    netbsd:breakpoint+0x5:  leave
 breakpoint() at netbsd:breakpoint+0x5
 vpanic() at netbsd:vpanic+0x1f2
 printf_nolog() at netbsd:printf_nolog
 xpq_queue_machphys_update() at netbsd:xpq_queue_machphys_update
 xen_kpm_sync() at netbsd:xen_kpm_sync+0x31
 pmap_enter_ma() at netbsd:pmap_enter_ma+0xe10
 pmap_enter() at netbsd:pmap_enter+0x35
 uvm_fault_lower_enter() at netbsd:uvm_fault_lower_enter+0xfe
 uvm_fault_internal() at netbsd:uvm_fault_internal+0xbf9
 trap() at netbsd:trap+0x5f5

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