From: Nathan Chancellor <nathan@kernel.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"David S. Miller" <davem@davemloft.net>,
Ard Biesheuvel <ardb@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Jonathan Corbet <corbet@lwn.net>,
Al Viro <viro@zeniv.linux.org.uk>,
llvm@lists.linux.dev
Subject: Re: [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell"
Date: Wed, 5 Jan 2022 15:33:26 -0700 [thread overview]
Message-ID: <YdYctmnM6kdN5R5s@archlinux-ax161> (raw)
In-Reply-To: <YdTpAJxgI+s9Wwgi@gmail.com>
On Wed, Jan 05, 2022 at 01:40:32AM +0100, Ingo Molnar wrote:
>
> * Nathan Chancellor <nathan@kernel.org> wrote:
>
> > Unfortunately, while the kernel now builds, it does not boot in QEMU. I
> > tried to checkout at 9006a48618cc0cacd3f59ff053e6509a9af5cc18 to see if I
> > could reproduce that breakage there but the build errors out at that
> > change (I do see notes of bisection breakage in some of the commits) so I
> > assume that is expected.
>
> Yeah, there's a breakage window on ARM64, I'll track down that
> bisectability bug.
>
> Decoupling thread_info and task_struct incrementally, so that it bisects
> cleanly on all architectures, was always a big challenge. :-/
>
> > There is no output, even with earlycon, so it seems like something is
> > going wrong in early boot code. I am not very familiar with the SCS code
> > so I will see if I can debug this with gdb later (I'll try to see if it
> > is reproducible with GCC as well; as Nick mentions, there is support
> > being added to it and I don't mind building from source).
>
> Just to make sure: with SCS disabled the same kernel boots fine?
Correct (thank you for making sure, I have definitely not tested that
before...).
$ make -skj"$(nproc)" ARCH=arm64 LLVM=1 O=.build/arm64 defconfig Image.gz
$ boot-qemu.sh -a arm64 -k .build/arm64 -t 30s
...
[ 0.000000] Linux version 5.16.0-rc8-798083-g1755441e323b (nathan@archlinux-ax161) (ClangBuiltLinux clang version 14.0.0 (https://github.com/llvm/llvm-project 4602f4169a21e75b82261ba1599046b157d1d021), LLD 14.0.0) #1 SMP PREEMPT Wed Jan 5 21:51:29 UTC 2022
...
$ make -skj"$(nproc)" ARCH=arm64 LLVM=1 O=.build/arm64.scs defconfig
$ scripts/config --file .build/arm64.scs/.config -e SHADOW_CALL_STACK
$ make -skj"$(nproc)" ARCH=arm64 LLVM=1 O=.build/arm64.scs olddefconfig Image.gz
...
qemu-system-aarch64: terminating on signal 15 from pid 690472 (timeout)
+ RET=124
+ set +x
Going back to v5.16-rc8, everything works fine.
$ boot-qemu.sh -a arm64 -k .build/arm64 -t 30s
...
[ 0.000000] Linux version 5.16.0-rc8-795784-gc9e6606c7fe9 (nathan@archlinux-ax161) (ClangBuiltLinux clang version 14.0.0 (https://github.com/llvm/llvm-project 4602f4169a21e75b82261ba1599046b157d1d021), LLD 14.0.0) #1 SMP PREEMPT Wed Jan 5 22:27:39 UTC 2022
...
I don't think I will have time to look at this today but I will try
tomorrow. Having the bisectability bug fixed would help narrow things
down but I am almost certain it is something up with the new per_task
infrastructure but I'll have to dig around and see if I can understand
that first.
Cheers,
Nathan
next prev parent reply other threads:[~2022-01-05 22:33 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-02 21:57 [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Ingo Molnar
2022-01-03 10:11 ` Greg Kroah-Hartman
2022-01-03 11:12 ` Ingo Molnar
2022-01-03 13:46 ` Greg Kroah-Hartman
2022-01-03 16:29 ` Ingo Molnar
2022-01-10 10:28 ` Peter Zijlstra
2022-01-04 14:10 ` [PATCH] per_task: Remove the PER_TASK_BYTES hard-coded constant Ingo Molnar
2022-01-04 15:14 ` Andy Shevchenko
2022-01-04 23:27 ` Ingo Molnar
2022-01-04 17:51 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Arnd Bergmann
2022-01-05 0:05 ` Ingo Molnar
2022-01-05 1:37 ` Arnd Bergmann
2022-01-05 9:37 ` Andy Shevchenko
2022-01-04 14:05 ` [PATCH] per_task: Implement single template to define 'struct task_struct_per_task' fields and offsets Ingo Molnar
2022-01-03 13:54 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Kirill A. Shutemov
2022-01-04 10:54 ` Ingo Molnar
2022-01-04 13:34 ` Greg Kroah-Hartman
2022-01-04 13:54 ` [PATCH] headers/uninline: Uninline single-use function: kobject_has_children() Ingo Molnar
2022-01-04 15:09 ` Greg Kroah-Hartman
2022-01-04 15:14 ` Greg Kroah-Hartman
2022-01-05 0:11 ` Ingo Molnar
2022-01-05 15:23 ` Greg Kroah-Hartman
2022-01-06 11:26 ` Ingo Molnar
2022-01-03 17:54 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Nathan Chancellor
2022-01-04 10:47 ` Ingo Molnar
2022-01-04 10:56 ` [DEBUG PATCH] DO NOT MERGE: Enable SHADOW_CALL_STACK on GCC builds, for build testing Ingo Molnar
2022-01-04 11:02 ` [PATCH] headers/deps: dcache: Move the ____cacheline_aligned attribute to the head of the definition Ingo Molnar
2022-01-04 15:05 ` kernel test robot
2022-01-04 17:51 ` Nathan Chancellor
2022-01-05 0:20 ` Ingo Molnar
2022-01-05 0:26 ` [PATCH] headers/deps: Attribute placement fixes for Clang & GCC Ingo Molnar
2022-01-04 11:19 ` [TREE] "Fast Kernel Headers" Tree WIP/development branch Ingo Molnar
2022-01-04 17:25 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Nick Desaulniers
2022-01-05 0:43 ` Ingo Molnar
2022-01-04 17:50 ` Nathan Chancellor
2022-01-05 0:35 ` [PATCH] x86/kbuild: Enable CONFIG_KALLSYMS_ALL=y in the defconfigs Ingo Molnar
2022-01-08 21:57 ` [tip: x86/build] " tip-bot2 for Ingo Molnar
2022-01-05 0:40 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Ingo Molnar
2022-01-05 1:07 ` Ingo Molnar
2022-01-05 5:20 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel'\''s "Dependency Hell Paul Zimmerman
2022-01-05 21:42 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Nathan Chancellor
2022-01-08 10:32 ` [PATCH] headers/deps: Add header dependencies to .c files: <linux/ptrace_api.h> Ingo Molnar
2022-01-08 11:08 ` [PATCH] FIX: headers/deps: uapi/headers: Create usr/include/uapi symbolic link Ingo Molnar
2022-01-08 11:18 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Ingo Molnar
2022-01-08 11:38 ` [PATCH] x86/bitops: Remove unused __sw_hweight64() assembly implementation Ingo Molnar
2022-01-08 11:49 ` [PATCH 0000/2297] [ANNOUNCE, RFC] "Fast Kernel Headers" Tree -v1: Eliminate the Linux kernel's "Dependency Hell" Ingo Molnar
2022-01-08 12:17 ` Ingo Molnar
2022-01-10 20:03 ` Nathan Chancellor
2022-01-10 20:05 ` Nathan Chancellor
2022-01-05 22:33 ` Nathan Chancellor [this message]
2022-01-08 15:16 ` Ingo Molnar
2022-01-07 0:29 ` Nathan Chancellor
2022-01-08 11:54 ` Ingo Molnar
2022-01-04 12:36 ` Willy Tarreau
2022-01-04 16:05 ` Andy Shevchenko
2022-01-04 16:18 ` Andy Shevchenko
2022-01-15 0:42 ` Paul E. McKenney
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