linux-kernel - Re: 4.14.9 doesn't boot (regression)

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Date:   Sat, 30 Dec 2017 16:16:51 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Alexander Tsoy <alexander@...y.me>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Toralf Förster <toralf.foerster@....de>,
        stable <stable@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: 4.14.9 doesn't boot (regression)

On Sun, Dec 31, 2017 at 01:03:25AM +0300, Alexander Tsoy wrote:
> > Turns out my previous code to print iret frames was a bit ...
> > misguided, to put it nicely.  Not sure what I was smoking.
> > 
> > Hopefully the below patch should fix it (in place of the previous
> > patch).  Would you mind testing again?
> > 
> 
> With that patch I get:
> 
> [    2.160017] NMI backtrace for cpu 0
> [    2.160017] CPU: 0 PID: 1 Comm: init Not tainted 4.15.0-rc5 #1
> [    2.160017] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1.fc27 04/01/2014
> [    2.160017] RIP: 0010:double_fault+0x0/0x30
> [    2.160017] RSP: 0000:fffffe8000007fd0 EFLAGS: 00010086
> [    2.160017] RAX: 00000000ffc00000 RBX: 0000000000000001 RCX: 00000000c0000101
> [    2.160017] RDX: 00000000ffff8edc RSI: 0000000000000000 RDI: fffffe8000007f58
> [    2.160017] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [    2.160017] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffa3c01426
> [    2.160017] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> [    2.160017] FS:  0000000000000000(0000) GS:ffff8edcffc00000(0000) knlGS:0000000000000000
> [    2.160017] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    2.160017] CR2: fffffe8000006f08 CR3: 000000007c153000 CR4: 00000000000006b0
> [    2.160017] Call Trace:
> [    2.160017]  <#DF>
> [    2.160017] RIP: 0010:do_double_fault+0xb/0x140
> [    2.160017] RSP: 0000:fffffe8000006f18 EFLAGS: 00010086
> [    2.160017]  </#DF>

Yes, that's more like it.  I'll clean up the patches and submit them
soon.  These nasty bugs are always a good testcase for the stack dump
code.

Thanks for testing!

-- 
Josh