[Bug 219399] System panics after several hours of 14-threads-compilation orgies using poudriere on AMD Ryzen...
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Mon Aug 7 22:26:13 UTC 2017
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219399
--- Comment #215 from Nils Beyer <nbe at renzel.net> ---
(In reply to Don Lewis from comment #214)
documentation is the keyword, I don't know; I only have this:
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from: linux/v4.12/source/arch/x86/include/asm/processor.h - lines 791 and seq
----------------------------------------------------------------------------
#ifdef CONFIG_X86_32
[...]
#else
/*
* User space process size. 47bits minus one guard page. The guard
* page is necessary on Intel CPUs: if a SYSCALL instruction is at
* the highest possible canonical userspace address, then that
* syscall will enter the kernel with a non-canonical return
* address, and SYSRET will explode dangerously. We avoid this
* particular problem by preventing anything from being mapped
* at the maximum canonical address.
*/
#define TASK_SIZE_MAX ((1UL << 47) - PAGE_SIZE)
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do we have or need something similar?
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