[Bug 208275] Kernel panic when reading from /dev/cd0 with a damaged dvd

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Fri Mar 25 02:26:08 UTC 2016


https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208275

            Bug ID: 208275
           Summary: Kernel panic when reading from /dev/cd0 with a damaged
                    dvd
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bsd at haps.ca
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 168591
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=168591&action=edit
dmesg

When I mount_cd9660 /dev/cd0 /mnt and then cp -Rv /mnt/ ., I reliably get a
kernel panic.  The cd is a bit scratched and old, there are some read timeout
debug messages, and the it just reboots.

The machine is a Thinkpad T440p.
The version of freebsd is 11-current, FreeBSD 11.0-CURRENT #0 r297046

I initially thought it might be drm2/i915kms related, but it panics if those
modules are loaded or not.

I've attached dmesg, and /var/crash/core.txt.0.
/var/crash/info.0 is:
Dump header from device: /dev/ada0p3
  Architecture: amd64
  Architecture Version: 2
  Dump Length: 856309760
  Blocksize: 512
  Dumptime: Thu Mar 24 22:11:03 2016
  Hostname: t440p.example.com
  Magic: FreeBSD Kernel Dump
  Version String: FreeBSD 11.0-CURRENT #0 r297046: Sat Mar 19 02:16:14 EDT 2016
    root at t440p.example.com:/usr/obj/usr/src/sys/GENERIC
  Panic String: page fault
  Dump Parity: 1773259869
  Bounds: 0
  Dump Status: good

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