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Date:   Sat, 23 Dec 2017 00:19:45 -0800
From:   Jakub Kicinski <kubakici@...pl>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux/master crashes on boot with KASAN=y

On Sat, 23 Dec 2017 00:01:43 -0800, Jakub Kicinski wrote:
> commit 21506525fb8ddb0342f2a2370812d47f6a1f3833 (HEAD, refs/bisect/bad)
> Author: Andy Lutomirski <luto@...nel.org>
> Date:   Mon Dec 4 15:07:16 2017 +0100
> 
>     x86/kasan/64: Teach KASAN about the cpu_entry_area
>     
>     The cpu_entry_area will contain stacks.  Make sure that KASAN has
>     appropriate shadow mappings for them.

> [   22.562224] BUG: unable to handle kernel paging request at fffffbffffe8ee04
> [   22.562234] IP: check_memory_region+0x5c/0x190
> [   22.562235] PGD 87ffd9067 P4D 87ffd9067 PUD 87ffd8067 PMD 87ffd7067 PTE 0

Reverting this doesn't get me far, though.  Boot stops after:

[    0.216037] Performance Events: PEBS fmt2+, Broadwell events, 16-deep LBR, full-width counters, Intel PMU driver.
[    0.220029] ... version:                3
[    0.224007] ... bit width:              48
[    0.228002] ... generic registers:      8
[    0.232002] ... value mask:             0000ffffffffffff
[    0.236002] ... max period:             00007fffffffffff
[    0.240002] ... fixed-purpose events:   3
[    0.244002] ... event mask:             00000007000000ff
[    0.256006] Hierarchical SRCU implementation.
[    0.277436] NMI watchdog: Enabled. Permanently consumes one hw-PMU counter.
[    0.288005] smp: Bringing up secondary CPUs ...
[    0.324086] x86: Booting SMP configuration:
[    0.328009] .... node  #1, CPUs:        #1
[    0.448004] .... node  #0, CPUs:    #2
[    0.484005] .... node  #1, CPUs:    #3
[    0.520004] .... node  #0, CPUs:    #4
[    0.556005] .... node  #1, CPUs:    #5
[    0.592004] .... node  #0, CPUs:    #6
[    0.628005] .... node  #1, CPUs:    #7
[    0.664004] .... node  #0, CPUs:    #8
[    0.700006] .... node  #1, CPUs:    #9
[    0.736004] .... node  #0, CPUs:   #10
[    0.772006] .... node  #1, CPUs:   #11
[    0.808004] .... node  #0, CPUs:   #12
[    0.844005] .... node  #1, CPUs:   #13
[    0.880004] .... node  #0, CPUs:   #14
[    0.916005] .... node  #1, CPUs:   #15
[    0.952004] .... node  #0, CPUs:   #16
[    0.988006] .... node  #1, CPUs:   #17
[    1.024004] .... node  #0, CPUs:   #18

Without producing any splat.

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