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Date:      Sat, 02 Dec 2017 17:57:10 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-scsi@FreeBSD.org
Subject:   [Bug 224037] Kernel crashes when trying to  mount certain USB keys reported as WriteProtected
Message-ID:  <bug-224037-5312-PF2P0kKSi7@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-224037-5312@https.bugs.freebsd.org/bugzilla/>
References:  <bug-224037-5312@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D224037

--- Comment #6 from Petr Leszkow <petr@leszkow.eu> ---
btw, just checked SCSI Asignment at http://www.t10.org/lists/asc-num.htm#AS=
C_27

for ASC 27,0 ...see list bellow:

so, I think it would be sufficient if kernel can instruct the cam or any up=
per
layer to do not attempt to mount devices with ASC 27,0 and 27,1 as RW and
handle them for example as CD/DVD asc 27,4 asc 27,5 ?

What do you think ?=20

Thanks.

Petr




       D - Direct Access Block Device (SBC-4)         Device Column key
       .Z - Host Managed Zoned Block Device (ZBC)     ---------------------
       . T - Sequential Access Device (SSC-5)         blank =3D code not us=
ed
       .  P - Processor Device (SPC-2)                not blank =3D code us=
ed
       .  .R - C/DVD Device (MMC-6)
       .  . O - Optical Memory Block Device (SBC)
       .  .  M - Media Changer Device (SMC-3)
       .  .  .A - Storage Array Device (SCC-2)SBC)
       .  .  . E - SCSI Enclosure Services device (SES-3)
       .  .  .  B - Simplified Direct-Access (Reduced Block) device (RBC)
       .  .  .  .K - Optical Card Reader/Writer device (OCRW)
       .  .  .  . V - Automation/Device Interface device (ADC-4)
       .  .  .  .  F - Object-based Storage Device (OSD-2)
ASC/   .  .  .  .  .
ASCQ   DZTPROMAEBKVF  Description
27/00  DZT RO   BK    WRITE PROTECTED
27/01  DZT RO   BK    HARDWARE WRITE PROTECTED
27/02  DZT RO   BK    LOGICAL UNIT SOFTWARE WRITE PROTECTED
27/03    T R          ASSOCIATED WRITE PROTECT
27/04    T R          PERSISTENT WRITE PROTECT
27/05    T R          PERMANENT WRITE PROTECT
27/06      R       F  CONDITIONAL WRITE PROTECT
27/07  DZ       B     SPACE ALLOCATION FAILED WRITE PROTECT
27/08  DZ             ZONE IS READ ONLY

--=20
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