Am 09.04.2012 20:40, schrieb Hugh Dickins:
I've not seen any such issue in recent months (or years), but I've not been using UML either. The most likely cause that springs to mind would be corruption of the vmalloc'ed swap map: that would be very likely to cause such a hang.
It does not look like a swap map corruption. If I restart most user space processes swapoff() terminates fine. Maybe it is a refcounting problem?
You say "recent Linux kernels": I wonder what "recent" means. Is this something you can reproduce quickly and reliably enough to do a bisection upon?
I can reproduce the issue on any UML kernel. The oldest I've tested was 2.6.20. Therefore, bug was not introduced by me. B-) Thanks, //richard -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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>