Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751163AbdFBJQa (ORCPT ); Fri, 2 Jun 2017 05:16:30 -0400 Received: from www17.your-server.de ([213.133.104.17]:41872 "EHLO www17.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750813AbdFBJQ2 (ORCPT ); Fri, 2 Jun 2017 05:16:28 -0400 Message-ID: <1496394957.19754.1.camel@m3y3r.de> Subject: Re: [PATCH v2] um: Avoid longjmp/setjmp symbol clashes with libpthread.a From: Thomas Meyer To: Richard Weinberger , Florian Fainelli , linux-kernel@vger.kernel.org Cc: Jeff Dike , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" , "open list:USER-MODE LINUX (UML)" , "open list:USER-MODE LINUX (UML)" Date: Fri, 02 Jun 2017 11:15:57 +0200 In-Reply-To: References: <20170524003232.14319-1-f.fainelli@gmail.com> <9f58b41d-ebe4-62a6-1aa4-e9222372ce86@gmail.com> <408132c9-6d55-7cba-e09a-f532d7fb9c6f@gmail.com> <9617f203-cee2-96cf-aa76-8f42b1a4a9f6@nod.at> <2c362d49-9907-7a66-67ef-e196dddea32a@gmail.com> <85f8b8c0-cf0e-3c67-c237-be4b045c617b@nod.at> <07b61d6a-33af-be0a-b57c-843196d0d151@nod.at> <8dd50867-312d-8af9-0993-4b5d5c181a58@gmail.com> <1496352322.9072.1.camel@m3y3r.de> <3672f56d-da81-1114-f06a-ac99d3680661@gmail.com> <1496390649.2047.2.camel@m3y3r.de> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.24.2 (3.24.2-1.fc26) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Authenticated-Sender: thomas@m3y3r.de Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4283 Lines: 103 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? Also on KVM or bare > metal? Hi, I just booted into bare metal, same machine, but host is Fedora 26 "Linux localhost.localdomain 4.11.3-300.fc26.x86_64 #1 SMP Thu May 25 18:43:57 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux" kernel log from host: [ 0.000000] Linux version 4.11.3-300.fc26.x86_64 (mockbuild@bkernel02.phx2.fedoraproject.org) (gcc version 7.1.1 20170503 (Red Hat 7.1.1-1) (GCC) ) #1 SMP Thu May 25 18:43:57 UTC 2017 [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x008: 'MPX bounds registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x010: 'MPX CSR' [ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 [ 0.000000] x86/fpu: xstate_offset[3]: 832, xstate_sizes[3]: 64 [ 0.000000] x86/fpu: xstate_offset[4]: 896, xstate_sizes[4]: 64 [ 0.000000] x86/fpu: Enabled xstate features 0x1f, context size is 960 bytes, using 'compacted' format. The same error happens in restore_fp_registers() with errno 4. processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 142 model name : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz stepping : 9 microcode : 0x38 cpu MHz : 499.853 cache size : 4096 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 22 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch epb intel_pt tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp bugs : bogomips : 5808.00 clflush size : 64 cache_alignment : 64 address sizes : 39 bits physical, 48 bits virtual power management: I'll try a host kernel from master, once I find some time. > Not that UML fails because of this and we're hunting a ghost... > > Thanks, > //richard >