On Mon, Jun 17, 2013 at 12:24:07PM -0400, Dhaval Giani wrote:Hi John,Thanks for the testing!
I have been giving your git tree a whirl, and in order to simulate a
limited memory environment, I was using memory cgroups.
The program I was using to test is attached here. It is your test
code, with some changes (changing the syscall interface, reducing
the memory pressure to be generated).
I trapped it in a memory cgroup with 1MB memory.limit_in_bytes and hit this,
[ 406.207612] ------------[ cut here ]------------
[ 406.207621] kernel BUG at mm/vrange.c:523!
[ 406.207626] invalid opcode: 0000 [#1] SMP
[ 406.207631] Modules linked in:
[ 406.207637] CPU: 0 PID: 1579 Comm: volatile-test Not tainted
Does below patch fix your problem?