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Date: Thu, 23 Sep 2021 17:08:40 +0100
From: Guillaume Tucker <guillaume.tucker@...labora.com>
To: Nathan Chancellor <nathan@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>,
"kernelci-results@...ups.io" <kernelci-results@...ups.io>,
linux-kernel@...r.kernel.org,
"Chang S. Bae" <chang.seok.bae@...el.com>,
Rik van Riel <riel@...riel.com>,
"H. Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: next/master bisection: baseline.login on minnowboard-turbot-E3826
Hi Nathan,
On 23/09/2021 16:46, Nathan Chancellor wrote:
> Hi Guillaume,
>
> On Thu, Sep 23, 2021 at 04:38:52PM +0100, Guillaume Tucker wrote:
>> Hi Thomas,
>>
>> Please see the bisection report below about a kernel panic on
>> minnowboard-turbot-E3826 right after starting init.
>>
>> Reports aren't automatically sent to the public while we're
>> trialing new bisection features on kernelci.org but this one
>> looks valid.
>>
>> Some more details can be found here:
>>
>> https://linux.kernelci.org/test/case/id/614c1a1e98c5ed9ffc99a2e9/
>>
>> The same issue appears to be reproducible with QEMU:
>>
>> https://linux.kernelci.org/test/case/id/614c71a50d39b53eee99a2f8/
>>
>> Please let us know if you need help debugging the issue or if you
>> have a fix to try.
>>
>> Best wishes,
>> Guillaume
>>
>>
>> GitHub: https://github.com/kernelci/kernelci-project/issues/53
>
> I believe this should be fixed with
> https://git.kernel.org/tip/724fc0248d450224b19ef5b5ee41e392348f6704,
> multiple CI systems tripped over it.
OK great, I see the tip tree is booting fine:
https://linux.kernelci.org/test/plan/id/614c8c4a88e1b3357199a307/
I've started a job with next-20210923 and the patch you mentioned
to help confirm it fixes it.
Thanks,
Guillaume
>> On 23/09/2021 14:05, KernelCI bot wrote:
>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>> * This automated bisection report was sent to you on the basis *
>>> * that you may be involved with the breaking commit it has *
>>> * found. No manual investigation has been done to verify it, *
>>> * and the root cause of the problem may be somewhere else. *
>>> * *
>>> * If you do send a fix, please include this trailer: *
>>> * Reported-by: "kernelci.org bot" <bot@...nelci.org> *
>>> * *
>>> * Hope this helps! *
>>> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
>>>
>>> next/master bisection: baseline.login on minnowboard-turbot-E3826
>>>
>>> Summary:
>>> Start: bc5aa70f2699 Add linux-next specific files for 20210923
>>> Plain log: https://storage.kernelci.org/next/master/next-20210923/x86_64/x86_64_defconfig/clang-12/lab-collabora/baseline-minnowboard-turbot-E3826.txt
>>> HTML log: https://storage.kernelci.org/next/master/next-20210923/x86_64/x86_64_defconfig/clang-12/lab-collabora/baseline-minnowboard-turbot-E3826.html
>>> Result: 2af07f3a6e9f x86/fpu/signal: Change return type of copy_fpregs_to_sigframe() helpers to boolean
>>>
>>> Checks:
>>> revert: PASS
>>> verify: PASS
>>>
>>> Parameters:
>>> Tree: next
>>> URL: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>>> Branch: master
>>> Target: minnowboard-turbot-E3826
>>> CPU arch: x86_64
>>> Lab: lab-collabora
>>> Compiler: clang-12
>>> Config: x86_64_defconfig
>>> Test case: baseline.login
>>>
>>> Breaking commit found:
>>>
>>> -------------------------------------------------------------------------------
>>> commit 2af07f3a6e9fb81331421ca24b26a96180d792dd
>>> Author: Thomas Gleixner <tglx@...utronix.de>
>>> Date: Wed Sep 8 15:29:34 2021 +0200
>>>
>>> x86/fpu/signal: Change return type of copy_fpregs_to_sigframe() helpers to boolean
>>>
>>> Now that copy_fpregs_to_sigframe() returns boolean the individual return
>>> codes in the related helper functions do not make sense anymore. Change
>>> them to return boolean success/fail.
>>>
>>> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
>>> Signed-off-by: Borislav Petkov <bp@...e.de>
>>> Link: https://lkml.kernel.org/r/20210908132525.794334915@linutronix.de
>>>
>>> diff --git a/arch/x86/kernel/fpu/signal.c b/arch/x86/kernel/fpu/signal.c
>>> index 7ce396dcc942..1d10fe9b5b6b 100644
>>> --- a/arch/x86/kernel/fpu/signal.c
>>> +++ b/arch/x86/kernel/fpu/signal.c
>>> @@ -65,7 +65,7 @@ static inline int check_xstate_in_sigframe(struct fxregs_state __user *fxbuf,
>>> /*
>>> * Signal frame handlers.
>>> */
>>> -static inline int save_fsave_header(struct task_struct *tsk, void __user *buf)
>>> +static inline bool save_fsave_header(struct task_struct *tsk, void __user *buf)
>>> {
>>> if (use_fxsr()) {
>>> struct xregs_state *xsave = &tsk->thread.fpu.state.xsave;
>>> @@ -82,18 +82,19 @@ static inline int save_fsave_header(struct task_struct *tsk, void __user *buf)
>>> if (__copy_to_user(buf, &env, sizeof(env)) ||
>>> __put_user(xsave->i387.swd, &fp->status) ||
>>> __put_user(X86_FXSR_MAGIC, &fp->magic))
>>> - return -1;
>>> + return false;
>>> } else {
>>> struct fregs_state __user *fp = buf;
>>> u32 swd;
>>> +
>>> if (__get_user(swd, &fp->swd) || __put_user(swd, &fp->status))
>>> - return -1;
>>> + return false;
>>> }
>>>
>>> - return 0;
>>> + return true;
>>> }
>>>
>>> -static inline int save_xstate_epilog(void __user *buf, int ia32_frame)
>>> +static inline bool save_xstate_epilog(void __user *buf, int ia32_frame)
>>> {
>>> struct xregs_state __user *x = buf;
>>> struct _fpx_sw_bytes *sw_bytes;
>>> @@ -131,7 +132,7 @@ static inline int save_xstate_epilog(void __user *buf, int ia32_frame)
>>>
>>> err |= __put_user(xfeatures, (__u32 __user *)&x->header.xfeatures);
>>>
>>> - return err;
>>> + return !err;
>>> }
>>>
>>> static inline int copy_fpregs_to_sigframe(struct xregs_state __user *buf)
>>> @@ -218,10 +219,10 @@ bool copy_fpstate_to_sigframe(void __user *buf, void __user *buf_fx, int size)
>>> }
>>>
>>> /* Save the fsave header for the 32-bit frames. */
>>> - if ((ia32_fxstate || !use_fxsr()) && save_fsave_header(tsk, buf))
>>> + if ((ia32_fxstate || !use_fxsr()) && !save_fsave_header(tsk, buf))
>>> return false;
>>>
>>> - if (use_fxsr() && save_xstate_epilog(buf_fx, ia32_fxstate))
>>> + if (use_fxsr() && !save_xstate_epilog(buf_fx, ia32_fxstate))
>>> return false;
>>>
>>> return true;
>>> -------------------------------------------------------------------------------
>>>
>>>
>>> Git bisection log:
>>>
>>> -------------------------------------------------------------------------------
>>> git bisect start
>>> # good: [58e2cf5d794616b84f591d4d1276c8953278ce24] init: Revert accidental changes to print irqs_disabled()
>>> git bisect good 58e2cf5d794616b84f591d4d1276c8953278ce24
>>> # bad: [bc5aa70f26995791074a00da8b57ead3a9c1a646] Add linux-next specific files for 20210923
>>> git bisect bad bc5aa70f26995791074a00da8b57ead3a9c1a646
>>> # good: [18b9b2db40708ef6bbcaa9b8d8d10b7bb21e26e6] Merge branch 'nand/next' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git
>>> git bisect good 18b9b2db40708ef6bbcaa9b8d8d10b7bb21e26e6
>>> # bad: [bcb42fa2db7240d8167cb1e7179f6377e468145e] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu.git
>>> git bisect bad bcb42fa2db7240d8167cb1e7179f6377e468145e
>>> # good: [c1d789f5e5155df5f629b95d93ac830fd7de97d6] Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
>>> git bisect good c1d789f5e5155df5f629b95d93ac830fd7de97d6
>>> # good: [ba8b54a3a086472c81ba2b4cda62dbd4adab45f6] Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit.git
>>> git bisect good ba8b54a3a086472c81ba2b4cda62dbd4adab45f6
>>> # bad: [dcb7b66df80dc908f7dded6e8839093169e56a7b] Merge branch 'tip-x86-misc' into tip-auto-latest
>>> git bisect bad dcb7b66df80dc908f7dded6e8839093169e56a7b
>>> # good: [ccb4a51cd81f7ab035ba25df2c46f6f3c79f180d] Merge branch 'sched/core'
>>> git bisect good ccb4a51cd81f7ab035ba25df2c46f6f3c79f180d
>>> # bad: [1acd24c77ba4ec1f141f5175d19ae7275ce311d0] Merge branch 'x86/fpu'
>>> git bisect bad 1acd24c77ba4ec1f141f5175d19ae7275ce311d0
>>> # good: [fcfb7163329ce832aafef31f26345ef5e8642a17] x86/fpu/signal: Move xstate clearing out of copy_fpregs_to_sigframe()
>>> git bisect good fcfb7163329ce832aafef31f26345ef5e8642a17
>>> # bad: [be0040144152ed834c369a7830487e5ee4f27080] x86/fpu/signal: Change return code of check_xstate_in_sigframe() to boolean
>>> git bisect bad be0040144152ed834c369a7830487e5ee4f27080
>>> # bad: [ee4ecdfbd28954086a09740dc931c10c93e39370] x86/signal: Change return type of restore_sigcontext() to boolean
>>> git bisect bad ee4ecdfbd28954086a09740dc931c10c93e39370
>>> # bad: [2af07f3a6e9fb81331421ca24b26a96180d792dd] x86/fpu/signal: Change return type of copy_fpregs_to_sigframe() helpers to boolean
>>> git bisect bad 2af07f3a6e9fb81331421ca24b26a96180d792dd
>>> # good: [052adee668284b67105375c0a524f16a423f1424] x86/fpu/signal: Change return type of copy_fpstate_to_sigframe() to boolean
>>> git bisect good 052adee668284b67105375c0a524f16a423f1424
>>> # first bad commit: [2af07f3a6e9fb81331421ca24b26a96180d792dd] x86/fpu/signal: Change return type of copy_fpregs_to_sigframe() helpers to boolean
>>> -------------------------------------------------------------------------------
>>
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