linux-kernel - Re: [PATCH] x86/orc: Don't bail on stack overflow

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Date:   Sun, 26 Nov 2017 10:27:48 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>,
        Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86/orc: Don't bail on stack overflow

On Sat, 25 Nov 2017, Josh Poimboeuf wrote:

> It looks a *lot* better with mine and your patches applied.  It probably
> would have helped Ingo and Thomas figure the problem out a lot sooner:

> [    1.159583] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    1.159583] CR2: ffffffffff083fb8 CR3: 0000000136f78002 CR4: 00000000001606e0
> [    1.159583] Call Trace:
> [    1.159583]  <SYSENTER>
> [    1.159583]  __do_page_fault+0x4b0/0x4b0
> [    1.159583]  page_fault+0x2c/0x60
> [    1.159583] RIP: 0010:do_page_fault+0x0/0x100
> [    1.159583] RSP: 0000:ffffffffff084120 EFLAGS: 00010012
> [    1.159583] RAX: 00000000819d0a87 RBX: 0000000000000001 RCX: ffffffff819d0a87
> [    1.159583] RDX: 0000000000001000 RSI: 0000000000000010 RDI: ffffffffff084128
> [    1.159583] RBP: 0000000000000d68 R08: 00007f6d6bb24278 R09: 0000000000000023
> [    1.159583] R10: 0000558e0feca600 R11: 0000000000000246 R12: 00007f6d6bb203c0
> [    1.159583] R13: 00007f6d6bb1f880 R14: 00007ffff793bebc R15: 0000000000000100
> [    1.159583]  ? native_iret+0x7/0x7
> [    1.159583]  page_fault+0x2c/0x60
> [    1.159583] RIP: 0010:apic_timer_interrupt+0x0/0xb0

Yes. That would have pointed immediately to the right place. It'd been
obvious that apic_timer_interrupt is not mapped.

Thanks,

	tglx