kern/58317: hang in vcache_vget()

[manu%netbsd.org@localhost]

>Number:         58317
>Category:       kern
>Synopsis:       hang in vcache_vget() on NetBSD-10.0/i386 XEN3PAE_DOMU
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jun 06 13:00:00 +0000 2024
>Originator:     Emmanuel Dreyfus
>Release:        NetBSD 10.0_STABLE
>Organization:
NetBSD
>Environment:
NetBSD w4.net.espci.fr 10.0 NetBSD 10.0 (XEN3PAE_DOMU) #2: Mon May 13 14:12:32 CEST 2024  root@duplo:/pkg_comp/NetBSD-10stable-i386/src/sys/arch/i386/compile/XEN3PAE_DOMU i386
Architecture: i386
Machine: i386
>Description:
	Machine hangs in moderate load. Many processes are waiting tstile. 
	One is waiting vnode with this backtrace:

sleepq_block
cv_wait   
vcache_vget
vcache_get
ufs_lookup
VOP_LOOKUP
lookup_once
namei_tryemulroot.constprop.0
namei 
vn_open   
do_open   
do_sys_openat 

>How-To-Repeat:
	No idea yet
>Fix:
	No idea yet

>Unformatted:
 	NetBSD-10.0/i386 XEN3PAE_DOMU
 	with this addition:
 	https://releng.netbsd.org/cgi-bin/req-10.cgi?show=701