kern/84498: file system hangs when jail starts if unionfs is involved

Marc G. Fournier scrappy at
Thu Aug 4 05:20:12 GMT 2005

The following reply was made to PR kern/84498; it has been noted by GNATS.

From: "Marc G. Fournier" <scrappy at>
To: bug-followup at
Subject: Re: kern/84498: file system hangs when jail starts if unionfs is
Date: Thu, 4 Aug 2005 02:19:37 -0300 (ADT)

 Just having found the vfs.uniondebug option, I've enabled this before 
 starting the jail in order to try and get some more information ... the 
 complete log is 3147 lines long, so am only including the part at which 
 the 'trace' ends (ie. the point at which the sendmail process hangs) ... 
 if more is desired, please let me know ...
 Create 0xc4c82dd0 = 0xc4c85000 0xc3da2550 refs=3
 Out 0 vpp 0xc4c82dd0/3 lower 0 upper 0
 A 0xc4c85000
 parentdir 0xc4c85000 result 0xc4c82aa0 flag 120c04c
 uerror 0 upperdvp 0xc4c85000 4/2, uppervp 0xc4c82aa0 ref=2/lck=2
 B 0xc3da2550
 parentdir 0xc3da2550 result 0xc4c82cc0 flag 120c04c
 Modify existing un 0xc3307100 vn 0xc4c82bb0 upper 0xc4c82aa0(refs 2) -> 0xc4c82aa0(refs 2)
 Create 0xc4c82bb0 = 0xc4c82aa0 0xc4c82cc0 refs=1
 Out 0 vpp 0xc4c82bb0/1 lower 0 upper 0
 union_root UPPERVP 0xc4c39220 locked = 0
 Modify existing un 0xc2937a80 vn 0xc4c38770 upper 0xc4c39220(refs 11) -> 0xc4c39220(refs 11)
 error 0
 union_root2 UPPERVP 0xc4c39220 locked = 0
 A 0xc4c39220
 parentdir 0xc4c39220 result 0xc381f550 flag 100404c
 uerror 0 upperdvp 0xc4c39220 11/2, uppervp 0xc381f550 ref=8/lck=2
 B 0xc2d19220
 parentdir 0xc2d19220 result 0xc33e5cc0 flag 100404c
 union_root UPPERVP 0xc4c39220 locked = 0
 Marc G. Fournier           Hub.Org Networking Services (
 Email: scrappy at           Yahoo!: yscrappy              ICQ: 7615664

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