Ingo Molnar <mingo@xxxxxxx> writes: > * Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > >> And in addition, I don't see why others wouldn't see it (I've got >> DEBUG_PAGEALLOC and SLUB_DEBUG_ON turned on myself, and I know others >> do too). > > I've done extensive randconfig testing and no crash triggers for typical workloads > on a typical dual-core PC. If there's a generic crashes in there my tests tend to > trigger them at least 10x as often as regular testers ;-) But the tests are still > only statistical so the race could simply be special and missed by the tests. > >> So I'm wondering what triggers it. Must be something subtle. > > I think what Michal did before he got the corruption seemed somewhat atypical: > suspend/resume and udevd wifi twiddling, right? > > Now, Eric's crashes look similar - and he does not seem to have done anything > special to trigger the crashes. > > Eric, could you possibly describe your system in a bit more detail, does it do > suspend and does the box use wifi actively? Anything atypical in your setup or usage > that doesnt match a bog-standard whitebox PC with LAN? Swap to file? NFS? FUSE? > Anything that is even just borderline atypical. 10G RAM 2G Swap dual socket system 4 cores per socket No hyperthreading. fedora 14 ext4 on all filesystems The biggest difference is I beat the system to death with automated builds. I was about to say this happens with DEBUG_PAGEALLOC enabled but it appears that options keeps eluding my fingers when I have a few minutes to play with it. Perhaps this time will be the charm. The biggest difference may be that I am constantly stressing the system to the edge of triggering the OOM killer. My builds and tests are greedy when it comes to memory. I guess also I only see the bad PMD on processes that exit. So it may be that it is a matter of timing to see it. Eric -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>