Messages in this thread | | | From | Kay Sievers <> | Date | Wed, 3 Aug 2011 15:33:27 +0200 | Subject | Re: [PATCH] shm: fix a race between shm_exit() and shm_init() |
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On Wed, Aug 3, 2011 at 15:13, Thadeu Lima de Souza Cascardo <cascardo@minaslivre.org> wrote: > As Marc Zyngier has pointed out, the culprit is driver_init, which > calls devices_init. I'd say other calls from driver_init also call into > kset and kobject, which will dispatch uevent helper. > > I tried to reproduce the problem using UML and only was successful after > setting CONFIG_UEVENT_HELPER_PATH. I guess we could obsolete this > feature and plan its removal soon. Is anybody still using this?
Forking binaries from the kernel for frequent events is something fundamentally wrong to do. It is not even rate-limited or has any upper bounds. It is known to create out-of-memory situations on machines with many devices and tiny RAM. Configs that virtualizations with many guests use pretty often. They can not even bootup with /sbin/hotplug enabled then.
It would be nice to remove that broken thing, no common system or distro uses it since quite some years now. But I wouldn't be surprised if some people still use it for whatever hack they need locally.
Kay
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