Confirmed kernel from -proposed fixes the issue. Test case program and
vsftpd both run without triggering the kernel messages.
[0.00] Linux version 3.13.0-30-generic (buildd@allspice) (gcc version
4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #54-Ubuntu SMP Mon Jun 9 22:45:01 UTC 2014
(Ubuntu 3.13.0
iately see
something similar to:
triden@tweety:~$ ./bugtest
[ 837.276658] BUG: Bad page map in process bugtest pte:8965
pmd:3c076067
[ 837.27] page:ea00 count:-31 mapcount:-31 mapping:
(null) index:0x0
[ 837.276669] page flags: 0x10(dirty)
[ 837.276672] page dump
I've been using 3.15.0-031500rc2-generic #201404201435 SMP Sun Apr 20
18:36:18 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux from the Ubuntu
Mainline kernel PPA on all my Xen guests for weeks without issue.
Looks like the patch is scheduled for the 3.13.11.3 kernel update.
Ref: https://lists.ubuntu.com
The problem can occur with any application as stated by Boris Ostrovsky
"This can be easily triggered by Linux' page-types
(tools/vm/page-types.c) after save/restore.
All it does is it walks the page tables (in fs/proc/task_mmu.c) and
eventually trips on bad page. For example:
# /pa
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