[Bug runtime/21726] on rawhide, the backtrace.exp test case causes a kernel panic

[dsmith at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21726

--- Comment #5 from David Smith <dsmith at redhat dot com> ---
Commit 109e4e7 adds a workaround that avoids the kernel panic (by not calling
access_ok() in hard IRQ context).

For a longer term fix, we should remove uses of access_ok() in favor of our
uderef() / kderef() macros. There are other access_ok() uses in
runtime/linux/addr-map.c and tapset/linux/nfs.stp. These should all be replaced
if possible.

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