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Historical netbsd-5 domUs now panic

I've recently updated our XenServers with the latest security patches and had to set pv-linear-pt=true to get NetBSD domUs to boot. For historical reasons, I have a couple of netbsd-5/i386 VMs which are now frequently panicking:

xpq_flush_queue: 3 entries
0x000000060481bfe0: 0x0000000604819001
0x00000007eac9fd40: 0x0000000604819001
0x00000007eab73d40: 0x0000000604819001
panic: HYPERVISOR_mmu_update failed

fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c039e374 cs 9 eflags 246 cr2 bb75b1a0 ilevel 6
Stopped in pid 15.1 (fsck_ffs) at       0xc039e374:     popl    %ebp

Kernel is pretty old and also has no symbols:
NetBSD 5.2_STABLE (XEN3PAE_DOMU) #37: Fri Nov 27 12:02:02 UTC 2015

Does anyone have an idea of a quick way to fix this (yes, I know I could use a newer kernel with the old userland)? If I build a kernel with symbols, would a backtrace help?


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