kern/52034: Kernel panic on Google Compute Engine

[bsiegert%NetBSD.org@localhost]

>Number:         52034
>Category:       kern
>Synopsis:       Kernel panic on Google Compute Engine
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 05 11:20:00 +0000 2017
>Originator:     Benny Siegert
>Release:        NetBSD 7.1_RC2
>Organization:
The NetBSD Foundation
>Environment:
>Description:
My NetBSD (amd64) test machine on Google Compute Engine seems kinda crashy whenever there is significant disk activity -- such as installing packages, unpacking tarballs, etc.

I managed to grab this backtrace from the serial console:
 

fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff80113ac4 cs 8 rflags 10202 cr2 ffff80008b58c000 ilevel 0 rsp fffffe810e367c08
curlwp 0xfffffe81104279a0 pid 790.1 lowest kstack 0xfffffe810e3652c0
panic: trap
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
snprintf() at netbsd:snprintf
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0x96
uiomove() at netbsd:uiomove+0x91
ubc_uiomove() at netbsd:ubc_uiomove+0xa6
ffs_read() at netbsd:ffs_read+0x372
VOP_READ() at netbsd:VOP_READ+0x37
vn_read() at netbsd:vn_read+0x94
dofileread() at netbsd:dofileread+0x90
sys_read() at netbsd:sys_read+0x5f
syscall() at netbsd:syscall+0x9a
--- syscall (number 3) ---
7f7ff6c3c3ba:
cpu0: End traceback...
>How-To-Repeat:
Launch a NetBSD instance on GCE (https://github.com/google/netbsd-gce/ may help).

Use the disk.
>Fix:
?