usb/109397: [panic] on boot from USB flash

[Alexander Shiryaev]

The following reply was made to PR usb/109397; it has been noted by GNATS.

From: Alexander Shiryaev <coumarin at gmail.com>
To: "M. Warner Losh" <imp at bsdimp.com>
Cc: freebsd-gnats-submit at freebsd.org
Subject: Re: usb/109397: [panic] on boot from USB flash
Date: Wed, 21 Feb 2007 21:26:07 +0300

 M. Warner Losh wrote:
 > You might also try setting / and /usr to read only to see if the
 > corruption occurs during boot or before.
 > 
 > Warner
 > 
 
 I have following slice structure on USB flash (bsdlabel /dev/da0s1):
 
 # /dev/da0s1:
 8 partitions:
 #        size   offset    fstype   [fsize bsize bps/cpg]
    a:   262144       16    4.2BSD     1024  8192 32776
    c:  4016187        0    unused        0     0         # "raw" part, 
 don't edit
    d:   131072   262160    4.2BSD     1024  8192 16392
    e:   131072   393232    4.2BSD     1024  8192 16392
    f:  1523696   524304    4.2BSD     2048 16384 28552
 
 (newfs /dev/da0s1a; newfs -U /dev/da0s1d; newfs -U /dev/da0s1e; newfs -U 
 /dev/da0s1f)
 
 I have this /etc/fstab on USB flash:
 
 /dev/da0s1a     /        ufs      ro,sync    1       1
 /dev/da0s1d     /var     ufs      ro,sync    2       2
 /dev/da0s1e     /tmp     ufs      ro,sync    2       2
 /dev/da0s1f     /usr     ufs      ro,sync    2       2
 
 Then I boot system from USB flash, and get the same result:
 http://users.msu.dubna.ru/~shiryaev/files/fbsd/nokia020_1.jpg
 
 Then I retry to boot from USB flash, and see message "Missing operating 
 system".
 
 I.e. data structure is damaged even in case of specifying "ro,sync".
 
 Additional information:
 1. Kernel configuration: GENERIC, no CPUTYPE and CFLAGS in /etc/make.conf
 2. This bug does not take place in current version of DragonFlyBSD (but 
 there other bug takes place)
 
 Can somebody try to reproduce it? It can be 100% reproduced on my system.
 
 Alexander.