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2006年12月13日

Linux Kernel:2.6.19.1がでましたよ >>Linux 

Author: Zachary Amsden Date: Wed Dec 6 20:39:39 2006 -0800

[PATCH] softirq: remove BUG_ONs which can incorrectly trigger

It is possible to have tasklets get scheduled before softirqd has had a chance
to spawn on all CPUs. This is totally harmless; after success during action
CPU_UP_PREPARE, action CPU_ONLINE will be called, which immediately wakes
softirqd on the appropriate CPU to process the already pending tasklets. So
there is no danger of having a missed wakeup for any tasklets that were
already pending.

In particular, i386 is affected by this during startup, and is visible when
using a very large initrd; during the time it takes for the initrd to be
decompressed, a timer IRQ can come in and schedule RCU callbacks. It is also
possible that resending of a hardware IRQ via a softirq triggers the same bug.

Because of different timing conditions, this shows up in all emulators and
virtual machines tested, including Xen, VMware, Virtual PC, and Qemu. It is
also possible to trigger on native hardware with a large enough initrd,
although I don't have a reliable case demonstrating that.

Signed-off-by: Zachary Amsden Cc: Cc: Ingo Molnar Cc: Signed-off-by: Andrew Morton Signed-off-by: Chris Wright

とか、IPTABLES関連やらなんやらかんやらのパッチですな。

twitterこの記事をTwitterでみんなに教える。

投稿者 debizoh : 2006年12月13日 23:39



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