linux-kernel - Re: [PATCH v2] um: Avoid longjmp/setjmp symbol clashes with libpthread.a

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Date:   Fri, 2 Jun 2017 10:30:55 +0200
From:   Richard Weinberger <richard@....at>
To:     Thomas Meyer <thomas@...3r.de>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Jeff Dike <jdike@...toit.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-devel@...ts.sourceforge.net>,
        "open list:USER-MODE LINUX (UML)" 
        <user-mode-linux-user@...ts.sourceforge.net>
Subject: Re: [PATCH v2] um: Avoid longjmp/setjmp symbol clashes with
 libpthread.a

Thomas,

Am 02.06.2017 um 10:04 schrieb Thomas Meyer:
> Am Donnerstag, den 01.06.2017, 22:49 -0700 schrieb Florian Fainelli:
> I see this in the kernel log:
> 
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/fpu/xstate.c:595 fpu__init_system_xstate+0x4d0/0x877
> [    0.000000] XSAVE consistency problem, dumping leaves
> [    0.000000] Modules linked in:
> [    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.10.15-200.fc25.x86_64 #1
> [    0.000000] Call Trace:
> [    0.000000]  dump_stack+0x63/0x86
> [    0.000000]  __warn+0xcb/0xf0
> [    0.000000]  warn_slowpath_fmt+0x5f/0x80
> [    0.000000]  ? xfeature_size+0x5a/0x78
> [    0.000000]  fpu__init_system_xstate+0x4d0/0x877
> [    0.000000]  ? msr_clear_bit+0x3a/0xa0
> [    0.000000]  ? 0xffffffffa3000000
> [    0.000000]  fpu__init_system+0x194/0x1be
> [    0.000000]  early_cpu_init+0xf7/0xf9
> [    0.000000]  setup_arch+0xba/0xcf0
> [    0.000000]  ? printk+0x57/0x73
> [    0.000000]  ? early_idt_handler_array+0x120/0x120
> [    0.000000]  start_kernel+0xb2/0x48a
> [    0.000000]  ? early_idt_handler_array+0x120/0x120
> [    0.000000]  x86_64_start_reservations+0x24/0x26
> [    0.000000]  x86_64_start_kernel+0x14d/0x170
> [    0.000000]  start_cpu+0x14/0x14
> [    0.000000] ---[ end trace d5213d72358dda94 ]---
> [    0.000000] CPUID[0d, 00]: eax=00000007 ebx=00000440 ecx=00000440 edx=00000000

Does this also happen with a mainline kernel? Also on KVM or bare metal?
Not that UML fails because of this and we're hunting a ghost...

Thanks,
//richard