It was fixed upstream. I'm not entirely sure whether 9.10 got this, but as VMware did not receive any further bug reports I guess it did.
commit 31a5639623a487d6db996c8138c9e53fef2e2d91 Author: Daisuke Nishimura <[email protected]> Date: Mon Sep 21 17:02:50 2009 -0700 mm: add_to_swap_cache() must not sleep After commit 355cfa73 ("mm: modify swap_map and add SWAP_HAS_CACHE flag"), read_swap_cache_async() will busy-wait while a entry doesn't exist in swap cache but it has SWAP_HAS_CACHE flag. Such entries can exist on add/delete path of swap cache. On add path, add_to_swap_cache() is called soon after SWAP_HAS_CACHE flag is set, and on delete path, swapcache_free() will be called (SWAP_HAS_CACHE flag is cleared) soon after __delete_from_swap_cache() is called. So, the busy-wait works well in most cases. But this mechanism can cause soft lockup if add_to_swap_cache() sleeps and read_swap_cache_async() tries to swap-in the same entry on the same cpu. This patch calls radix_tree_preload() before swapcache_prepare() and divides add_to_swap_cache() into two part: radix_tree_preload() part and radix_tree_insert() part(define it as __add_to_swap_cache()). Signed-off-by: Daisuke Nishimura <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Cc: Balbir Singh <[email protected]> Cc: Hugh Dickins <[email protected]> Cc: Johannes Weiner <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> ** Changed in: linux (Ubuntu) Status: Incomplete => Fix Released -- Kernel hang under memory stress https://bugs.launchpad.net/bugs/433646 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
