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From: sparkhuang <huangshaobo3@xiaomi.com>
To: <david@kernel.org>
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Subject: Re: [PATCH] fork: reset pointer tag of vmapped thread stack before vfree
Date: Fri, 7 Aug 2026 18:41:53 +0800
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On 2026-08-07  9:27 UTC, David wrote:=0D
> Were you able to reproduce this more than once?=0D
=0D
Still trying to reproduce it. So far it has only occurred this once.=0D
=0D
> Does this relate to CONFIG_KASAN_STACK?=0D
=0D
I'm not entirely sure if it's related.=0D
The configs relevant to this path are:=0D
	CONFIG_KASAN_SHADOW_OFFSET=3D0xefffffc000000000=0D
	CONFIG_HAVE_ARCH_KASAN=3Dy=0D
	CONFIG_HAVE_ARCH_KASAN_SW_TAGS=3Dy=0D
	CONFIG_HAVE_ARCH_KASAN_HW_TAGS=3Dy=0D
	CONFIG_HAVE_ARCH_KASAN_VMALLOC=3Dy=0D
	CONFIG_CC_HAS_KASAN_GENERIC=3Dy=0D
	CONFIG_CC_HAS_KASAN_SW_TAGS=3Dy=0D
	CONFIG_KASAN=3Dy=0D
	CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX=3Dy=0D
	# CONFIG_KASAN_GENERIC is not set=0D
	CONFIG_KASAN_SW_TAGS=3Dy=0D
	# CONFIG_KASAN_HW_TAGS is not set=0D
	CONFIG_KASAN_OUTLINE=3Dy=0D
	# CONFIG_KASAN_INLINE is not set=0D
	CONFIG_KASAN_STACK=3Dy=0D
	CONFIG_KASAN_VMALLOC=3Dy=0D
	# CONFIG_KASAN_KUNIT_TEST is not set=0D
	# CONFIG_KASAN_EXTRA_INFO is not set=0D
=0D
> Can you share the kernel config?=0D
=0D
I'll send it to you separately later.=0D
=0D
Thanks,=0D
Shaobo=