Re: vfree in timerfunciton causes kernel crash

[William Lee Irwin III]

On Fri, Apr 16, 2004 at 06:10:50PM +0200, Mikkel Christiansen wrote:
> Idea: a module allocates memory (vmalloc) for userspace program which 
> then craches.
> Due to lack of activity timer is  expires and free's the unused memory 
> (vfree).
> (see tc_core.c later in this mail for details)
> Problem: when timer expires and vfree is called then kernel crashes -
> or rather freezes silently.
> Can anyone explain why this happens? a kernel bug?
> Cheers
>    Mikkel
> kernel 2.6.5

Use schedule_work() to do this from process context. It's a programming
error (specifically a deadlock) to vfree() from interrupt context or with
interrupts disabled.


-- wli
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