Re: kern/53624 (dom0 freeze on domU exit)

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

The following reply was made to PR kern/53624; it has been noted by GNATS.

From: Manuel Bouyer <bouyer%antioche.eu.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: hannken%NetBSD.org@localhost, gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
        manu%netbsd.org@localhost, gson%gson.org@localhost
Subject: Re: kern/53624 (dom0 freeze on domU exit)
Date: Wed, 5 Dec 2018 09:50:13 +0100

 On Wed, Dec 05, 2018 at 08:40:00AM +0000, Andreas Gustafsson wrote:
 > The following reply was made to PR kern/53624; it has been noted by GNATS.
 > 
 > From: Andreas Gustafsson <gson%gson.org@localhost>
 > To: gnats-bugs%NetBSD.org@localhost
 > Cc: Emmanuel Dreyfus <manu%netbsd.org@localhost>
 > Subject: Re: kern/53624 (dom0 freeze on domU exit)
 > Date: Wed, 5 Dec 2018 10:35:18 +0200
 > 
 >  I reproduced the freeze using xenkernel411.   Here's some ddb output:
 >  
 >    db> ps
 >    PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 >    11125    1 3   0        80   ffffa30001f3f740           vnconfig fstcnt
 >    10492    1 3   0         0   ffffa300020c34e0           vnconfig biowait
 >    [...]
 >    0      126 3   0       200   ffffa300020834a0               vnd4 vndbp
 >    0      125 3   0       200   ffffa3000204e040               vnd3 fstchg
 >    0      124 3   0       200   ffffa30000ed1660               vnd2 vndbp
 >    0      123 3   0       200   ffffa30002031840               vnd1 fstchg
 >    0       66 3   0       200   ffffa3000088a8e0               vnd0 vndbp
 >    [...]
 >    db> call fstrans_dump
 >    Fstrans locks by lwp:
 >    [ 87719.6801535] 10492.1  (/) shared 1 cow 0
 >    [ 87719.6801535] Fstrans state by mount:
 >    [ 87719.6801535] /                state suspending
 >    0
 >    db>
 >  
 >  If there are other ddb commands I can run to help debug this, please
 >  let me know.  I will try to keep the system at the ddb prompt for the
 >  next 24 hours at least.
 
 Can you get a stack trace (tr/a) for the processes listed above ?
 
 -- 
 Manuel Bouyer <bouyer%antioche.eu.org@localhost>
      NetBSD: 26 ans d'experience feront toujours la difference
 --