From: Borislav Petkov <bp@alien8.de>
To: Nathan Chancellor <nathan@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
David Kaplan <david.kaplan@amd.com>,
Ingo Molnar <mingo@kernel.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
x86@kernel.org, llvm@lists.linux.dev
Subject: Re: [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime
Date: Mon, 16 Oct 2023 23:29:44 +0200 [thread overview]
Message-ID: <20231016212944.GGZS2rSCbIsViqZBDe@fat_crate.local> (raw)
In-Reply-To: <20231016211040.GA3789555@dev-arch.thelio-3990X>
On Mon, Oct 16, 2023 at 02:10:40PM -0700, Nathan Chancellor wrote:
> I just bisected a boot failure that our continuous integration sees [1]
> with x86_64_defconfig + CONFIG_KCSAN=y to this change in -tip/-next. It
> does not appear to be clang specific, as I can reproduce it with GCC
> 13.2.0 from kernel.org [2] (the rootfs is available at [3], if it is
> necessary for reproducing).
>
> $ make -skj"$(nproc)" ARCH=x86_64 CROSS_COMPILE=x86_64-linux- defconfig
> $ scripts/config -e KCSAN
> $ make -skj"$(nproc)" ARCH=x86_64 CROSS_COMPILE=x86_64-linux- olddefconfig bzImage
> $ qemu-system-x86_64 \
> -display none \
> -nodefaults \
> -d unimp,guest_errors \
> -append 'console=ttyS0 earlycon=uart8250,io,0x3f8' \
> -kernel arch/x86/boot/bzImage \
> -initrd x86_64-rootfs.cpio \
> -cpu host \
What's the host?
> If there is any other information I can provide or patches I can test, I
> am more than happy to do so.
Yes, pls send your .config too because depending on the compiler, KCSAN
does get disabled with older ones. So I guess it has to be gcc 13 or so.
And full guest dmesg so that I can compare.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2023-10-16 21:30 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-10 17:10 [PATCH 0/3] " David Kaplan
2023-10-10 17:10 ` [PATCH 1/3] Revert "x86/retpoline: Remove .text..__x86.return_thunk section" David Kaplan
2023-10-10 17:48 ` Peter Zijlstra
2023-10-10 19:57 ` Josh Poimboeuf
2023-10-10 20:04 ` Borislav Petkov
2023-10-10 20:19 ` Josh Poimboeuf
2023-10-10 20:40 ` Kaplan, David
2023-10-10 21:22 ` Josh Poimboeuf
2023-10-11 7:41 ` Peter Zijlstra
2023-10-11 9:34 ` Borislav Petkov
2023-10-11 16:28 ` Josh Poimboeuf
2023-10-11 22:35 ` Peter Zijlstra
2023-10-11 22:42 ` Ingo Molnar
2023-10-12 2:27 ` Josh Poimboeuf
2023-10-12 2:47 ` [PATCH v2] objtool: Fix return thunk patching in retpolines Josh Poimboeuf
2023-10-12 6:25 ` [tip: x86/bugs] " tip-bot2 for Josh Poimboeuf
2023-10-12 8:16 ` [PATCH v2] " Peter Zijlstra
2023-10-12 17:50 ` [tip: x86/bugs] " tip-bot2 for Josh Poimboeuf
2023-10-20 11:37 ` tip-bot2 for Josh Poimboeuf
2023-10-12 8:16 ` [PATCH 1/3] Revert "x86/retpoline: Remove .text..__x86.return_thunk section" Peter Zijlstra
2023-10-10 17:10 ` [PATCH 2/3] x86/vdso: Run objtool on vdso32-setup David Kaplan
2023-10-12 17:50 ` [tip: x86/bugs] x86/vdso: Run objtool on vdso32-setup.o tip-bot2 for David Kaplan
2023-10-20 11:37 ` tip-bot2 for David Kaplan
2023-10-10 17:10 ` [PATCH 3/3] x86/retpoline: Ensure default return thunk isn't used at runtime David Kaplan
2023-10-10 19:36 ` Josh Poimboeuf
2023-10-10 20:14 ` Kaplan, David
2023-10-10 20:41 ` Josh Poimboeuf
2023-10-12 14:10 ` [PATCH -v2] " Borislav Petkov
2023-10-12 17:11 ` Josh Poimboeuf
2023-10-12 17:50 ` [tip: x86/bugs] " tip-bot2 for David Kaplan
2023-10-16 21:10 ` Nathan Chancellor
2023-10-16 21:29 ` Borislav Petkov [this message]
2023-10-16 21:48 ` Nathan Chancellor
2023-10-17 4:31 ` Kaplan, David
2023-10-17 5:28 ` Josh Poimboeuf
2023-10-17 13:54 ` Kaplan, David
2023-10-17 15:24 ` Nick Desaulniers
2023-10-17 15:26 ` Marco Elver
2023-10-17 15:32 ` Nathan Chancellor
2023-10-17 16:59 ` [PATCH] x86/srso: Fix panic in return thunk during boot Josh Poimboeuf
2023-10-17 17:52 ` [tip: x86/bugs] x86/retpoline: Make sure there are no unconverted return thunks due to KCSAN tip-bot2 for Josh Poimboeuf
2023-10-20 11:37 ` tip-bot2 for Josh Poimboeuf
2023-10-18 13:23 ` [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime Borislav Petkov
2023-10-18 13:38 ` Ingo Molnar
2023-10-18 15:12 ` Borislav Petkov
2023-10-18 15:54 ` Josh Poimboeuf
2023-10-18 17:55 ` Borislav Petkov
2023-10-18 18:14 ` Josh Poimboeuf
2023-10-18 18:22 ` Borislav Petkov
2023-10-18 18:39 ` Josh Poimboeuf
2023-10-18 18:44 ` Borislav Petkov
2023-10-18 19:14 ` Josh Poimboeuf
2023-10-18 20:04 ` Borislav Petkov
2023-10-18 20:37 ` Borislav Petkov
2023-10-19 6:35 ` Josh Poimboeuf
2023-10-19 6:59 ` Josh Poimboeuf
2023-10-19 14:15 ` Borislav Petkov
2023-10-19 14:21 ` Kaplan, David
2023-10-19 14:39 ` Borislav Petkov
2023-10-19 15:20 ` Josh Poimboeuf
2023-10-24 20:19 ` Borislav Petkov
2024-01-03 18:46 ` Borislav Petkov
2024-01-04 13:12 ` Borislav Petkov
2024-01-04 13:24 ` [PATCH -v2] " Borislav Petkov
2024-01-04 13:26 ` Borislav Petkov
2024-02-07 17:50 ` Josh Poimboeuf
2024-02-07 18:53 ` Borislav Petkov
2024-02-07 19:49 ` Josh Poimboeuf
2024-02-12 10:43 ` Borislav Petkov
2024-04-03 17:10 ` Klara Modin
2024-04-03 17:30 ` Borislav Petkov
2024-04-03 20:26 ` Klara Modin
2024-04-03 20:41 ` Borislav Petkov
2024-04-03 22:25 ` Klara Modin
2024-04-04 14:44 ` Borislav Petkov
2024-04-16 9:27 ` Borislav Petkov
2024-04-17 3:59 ` Klara Modin
2024-04-17 16:20 ` [tip: x86/urgent] x86/retpolines: Enable the default thunk warning only on relevant configs tip-bot2 for Borislav Petkov (AMD)
2023-10-19 7:43 ` [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime Peter Zijlstra
2023-10-19 9:40 ` [tip: x86/bugs] Revert "x86/retpoline: Remove .text..__x86.return_thunk section" tip-bot2 for Borislav Petkov (AMD)
2023-10-19 9:40 ` [tip: x86/bugs] Revert "x86/retpoline: Ensure default return thunk isn't used at runtime" tip-bot2 for Borislav Petkov (AMD)
2024-10-04 19:37 ` Peter Zijlstra
2024-02-12 14:13 ` [tip: x86/bugs] x86/retpoline: Ensure default return thunk isn't used at runtime tip-bot2 for Josh Poimboeuf
2024-02-15 3:20 ` Nathan Chancellor
2024-02-15 8:30 ` Nikolay Borisov
2024-02-15 15:53 ` Borislav Petkov
2024-02-16 5:42 ` Josh Poimboeuf
2024-02-16 21:27 ` Borislav Petkov
2024-02-20 5:57 ` [PATCH] x86/vdso: Fix rethunk patching for vdso-image-{32,64}.o Josh Poimboeuf
2024-02-20 12:31 ` [tip: x86/core] " tip-bot2 for Josh Poimboeuf
2023-10-10 17:52 ` [PATCH 0/3] Ensure default return thunk isn't used at runtime Peter Zijlstra
2023-10-20 11:28 ` Subject: [PATCH] x86/retpoline: Document some thunk handling aspects (was: Re: [PATCH 0/3] Ensure default return thunk isn't used at runtime) Borislav Petkov
2023-10-20 11:37 ` [tip: x86/bugs] x86/retpoline: Document some thunk handling aspects tip-bot2 for Borislav Petkov (AMD)
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