A simple test case was created by Steven Noonan to trigger the issue: Copy the attached code into a file named bugtest.c Compile with "gcc -o bugtest bugtest.c" Run ./bugtest (does not have to be run as root) If you see no output, bug does not exist; if it does you will immediately see something similar to:
triden@tweety:~$ ./bugtest [ 837.276658] BUG: Bad page map in process bugtest pte:8000000000000965 pmd:3c076067 [ 837.276666] page:ffffea0000000000 count:-31 mapcount:-31 mapping: (null) index:0x0 [ 837.276669] page flags: 0x10(dirty) [ 837.276672] page dumped because: bad pte [ 837.276674] addr:00007f0639a5e000 vm_flags:08100071 anon_vma:ffff88003b1fdbc0 mapping: (null) index:7f0639a5e [ 837.276821] BUG: Bad rss-counter state mm:ffff88003d2e8700 idx:0 val:-1 [ 837.276825] BUG: Bad rss-counter state mm:ffff88003d2e8700 idx:1 val:1 Reference: https://lkml.org/lkml/2014/1/21/544 ** Attachment added: "testcase program" https://bugs.launchpad.net/ubuntu/+source/vsftpd/+bug/1313450/+attachment/4129266/+files/xen-bug.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1313450 Title: Unable to start vsftpd on Ubuntu 14.04 (Amazon/EC2 or Xen) with default configuration To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1313450/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
