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

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Date:   Fri, 02 Jun 2017 15:18:02 +0200
From:   Thomas Meyer <thomas@...3r.de>
To:     Richard Weinberger <richard@....at>,
        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

Am Freitag, den 02.06.2017, 10:30 +0200 schrieb Richard Weinberger:
> 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? 

Yes, same error on current master on bare metal:

[    5.300000] Key type encrypted registered
[    5.300000] This architecture does not have kernel memory protection.
[    5.300000] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

* master                3b1e342be265 Merge tag 'nfsd-4.12-1' of git://linux-nfs.org/~bfields/linux

> Also on KVM or bare metal?
> Not that UML fails because of this and we're hunting a ghost...
> 
> Thanks,
> //richard
>