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Date: Wed, 18 Mar 2026 12:53:36 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Wentao Guan <guanwentao@uniontech.com>
Cc: brauner@kernel.org, broonie@kernel.org, davidgow@google.com,
	gtucker@gtucker.io, patches@lists.linux.dev, stable@vger.kernel.org
Subject: Re: kthread: consolidate kthread exit paths to prevent use-after-free
Message-ID: <2026031827-pruning-spindle-74fb@gregkh>
References: <20260317163006.067634764@linuxfoundation.org>
 <20260317175812.707723-1-guanwentao@uniontech.com>
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In-Reply-To: <20260317175812.707723-1-guanwentao@uniontech.com>

On Wed, Mar 18, 2026 at 01:58:12AM +0800, Wentao Guan wrote:
> Hello,
> 
> I want you know that need backport ("bpf: drop kthread_exit from noreturn_deny"),
> which commit 7fe44c4388146bdbb3c5932d81a26d9fa0fd3ec9 upstream,
> or will met "WARN: resolve_btfids: unresolved symbol kthread_exit" to cause build fail,
> I test v6.18.19-rc1 with the patch build ok for me.
> 
> BRs
> Wentao Guan
> 
> Log:
>  AR      drivers/gpu/built-in.a
>   AR      drivers/built-in.a
>   AR      built-in.a
>   AR      vmlinux.a
>   LD      vmlinux.o
>   GEN     .vmlinux.objs
>   MODPOST Module.symvers
>   CC      .vmlinux.export.o
>   UPD     include/generated/utsversion.h
>   CC      init/version-timestamp.o
>   KSYMS   .tmp_vmlinux0.kallsyms.S
>   AS      .tmp_vmlinux0.kallsyms.o
>   LD      .tmp_vmlinux1
>   BTF     .tmp_vmlinux1.btf.o
>   NM      .tmp_vmlinux1.syms
>   KSYMS   .tmp_vmlinux1.kallsyms.S
>   AS      .tmp_vmlinux1.kallsyms.o
>   LD      .tmp_vmlinux2
>   NM      .tmp_vmlinux2.syms
>   KSYMS   .tmp_vmlinux2.kallsyms.S
>   AS      .tmp_vmlinux2.kallsyms.o
>   LD      vmlinux.unstripped
>   BTFIDS  vmlinux.unstripped
> WARN: resolve_btfids: unresolved symbol kthread_exit

Thanks, I've now queued this up.

greg k-h