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Date:      Thu, 17 Nov 2016 06:07:40 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 214597] [panic] Fatal trap 9 while mounting SD card with lock switch on
Message-ID:  <bug-214597-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D214597

            Bug ID: 214597
           Summary: [panic] Fatal trap 9 while mounting SD card with lock
                    switch on
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: felix.the.red@gmail.com
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

Created attachment 177106
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D177106&action=
=3Dedit
Screencap of fatal trap 9

While trying to mount an SD card with the lock switch on (very much like PR
94838), I get a kernel panic and fatal trap 9. The difference with this PR =
is
that they were running on 6.1-PRERELEASE, whereas I am running on 11.0-RELE=
ASE
(p2), so the condition either wasn't fixed or was reintroduced.

I insert the SD card and the console shows:

ugen0.7: <Generic> at usbus0
umass1: <Bulk-In, Bulk-Out, Interface> on usbus0
umass1:  SCSI over Bulk-Only; quirks =3D 0x4000
umass1:2:1: Attached to scbus2
da1 at umass-sim1 bus 1 scbus2 target 0 lun 0
da1: <Generic- SD/MMC/MS PRO 1.00> Removable Direct Access SPC-2 SCSI device
da1: Serial Number 20121112761000000
da1: 40.000MB/s transfers

When I try to mount the SD card with
mount -t msdosfs /dev/da1s1 /mnt

I get:
Fatal trap 9: general protection fault while in kernel mode
cpuid =3D 1; apic id =3D 01

I'm not going to type out the panic information - I took a photo of it and
it's attached to this PR.

I can reliably reproduce this by inserting the SD card with the physical=20
write protect set, trying to mount it (which fails), and then either (1) tr=
ying
to unmount the device or (2) removing the SD card.

I'm running on:
FreeBSD laptop 11.0-RELEASE-p2 FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24 06:55=
:27
UTC 2016     root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERI=
C=20
amd64

I have the core files, if that helps.

I also have a few KLDs loaded:
kern.vty=3Dvt
fuse_load=3D"YES"
vboxdrv_load=3D"YES"
atapicam_load=3D"YES"

I'm willing to help troubleshoot, just let me know what you need.

--=20
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