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Message-ID: <202505280957.3efe5bf5-lkp@intel.com>
Date: Wed, 28 May 2025 10:04:39 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Eric Biggers <ebiggers@...nel.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Ayush Jain
<Ayush.Jain3@....com>, <linux-kernel@...r.kernel.org>, <x86@...nel.org>,
<linux-crypto@...r.kernel.org>, <linux-pm@...r.kernel.org>, Borislav Petkov
<bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, Herbert Xu
<herbert@...dor.apana.org.au>, Ard Biesheuvel <ardb@...nel.org>,
<oliver.sang@...el.com>
Subject: Re: [PATCH v3 2/2] x86/fpu: Fix irq_fpu_usable() to return false
during CPU onlining
Hello,
kernel test robot noticed "WARNING:at_arch/x86/kernel/fpu/init.c:#fpu__init_cpu" on:
commit: b88c4665c7f43e1898f695642fd159c6c542e49b ("[PATCH v3 2/2] x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining")
url: https://github.com/intel-lab-lkp/linux/commits/Eric-Biggers/x86-fpu-Replace-in_kernel_fpu-with-kernel_fpu_allowed/20250520-233322
patch link: https://lore.kernel.org/all/20250520152938.21881-3-ebiggers@kernel.org/
patch subject: [PATCH v3 2/2] x86/fpu: Fix irq_fpu_usable() to return false during CPU onlining
in testcase: boot
config: i386-randconfig-003-20250522
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
(please refer to attached dmesg/kmsg for entire log/backtrace)
+------------------------------------------------------+------------+------------+
| | 5454801de7 | b88c4665c7 |
+------------------------------------------------------+------------+------------+
| WARNING:at_arch/x86/kernel/fpu/init.c:#fpu__init_cpu | 0 | 12 |
| EIP:fpu__init_cpu | 0 | 12 |
+------------------------------------------------------+------------+------------+
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202505280957.3efe5bf5-lkp@intel.com
[ 0.324937][ T0] ------------[ cut here ]------------
[ 0.325455][ T0] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/fpu/init.c:56 fpu__init_cpu (arch/x86/kernel/fpu/init.c:56 (discriminator 15))
[ 0.326299][ T0] Modules linked in:
[ 0.326690][ T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Tainted: G T 6.15.0-rc7-00706-gb88c4665c7f4 #1 PREEMPTLAZY c76c09082e833299bbcc71b75dc4abf37758b94a
[ 0.328079][ T0] Tainted: [T]=RANDSTRUCT
[ 0.328493][ T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 0.329028][ T0] EIP: fpu__init_cpu (arch/x86/kernel/fpu/init.c:56 (discriminator 15))
[ 0.329483][ T0] Code: 75 00 00 db e3 e8 64 28 00 00 a0 10 76 8a 83 84 c0 75 17 c6 05 10 76 8a 83 01 83 c4 08 5e 5f 5d 31 c0 31 d2 2e e9 58 cc 8c 01 <0f> 0b eb e5 e8 b3 0b 8c 01 f7 c7 00 02 00 00 75 bc eb bb 90 55 89
All code
========
0: 75 00 jne 0x2
2: 00 db add %bl,%bl
4: e3 e8 jrcxz 0xffffffffffffffee
6: 64 28 00 sub %al,%fs:(%rax)
9: 00 a0 10 76 8a 83 add %ah,-0x7c7589f0(%rax)
f: 84 c0 test %al,%al
11: 75 17 jne 0x2a
13: c6 05 10 76 8a 83 01 movb $0x1,-0x7c7589f0(%rip) # 0xffffffff838a762a
1a: 83 c4 08 add $0x8,%esp
1d: 5e pop %rsi
1e: 5f pop %rdi
1f: 5d pop %rbp
20: 31 c0 xor %eax,%eax
22: 31 d2 xor %edx,%edx
24: 2e e9 58 cc 8c 01 cs jmp 0x18ccc82
2a:* 0f 0b ud2 <-- trapping instruction
2c: eb e5 jmp 0x13
2e: e8 b3 0b 8c 01 call 0x18c0be6
33: f7 c7 00 02 00 00 test $0x200,%edi
39: 75 bc jne 0xfffffffffffffff7
3b: eb bb jmp 0xfffffffffffffff8
3d: 90 nop
3e: 55 push %rbp
3f: 89 .byte 0x89
Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: eb e5 jmp 0xffffffffffffffe9
4: e8 b3 0b 8c 01 call 0x18c0bbc
9: f7 c7 00 02 00 00 test $0x200,%edi
f: 75 bc jne 0xffffffffffffffcd
11: eb bb jmp 0xffffffffffffffce
13: 90 nop
14: 55 push %rbp
15: 89 .byte 0x89
[ 0.331175][ T0] EAX: 00000001 EBX: 00020801 ECX: 00000000 EDX: 00000000
[ 0.332290][ T0] ESI: 00000600 EDI: 00200206 EBP: 83841f78 ESP: 83841f68
[ 0.332937][ T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210202
[ 0.333655][ T0] CR0: 80050033 CR2: ffbff000 CR3: 0413a000 CR4: 000406b0
[ 0.334516][ T0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 0.335460][ T0] DR6: fffe0ff0 DR7: 00000400
[ 0.336093][ T0] Call Trace:
[ 0.336599][ T0] arch_cpu_finalize_init (arch/x86/kernel/cpu/common.c:2536)
[ 0.337340][ T0] start_kernel (init/main.c:1067)
[ 0.338019][ T0] i386_start_kernel (arch/x86/kernel/head32.c:79 (discriminator 1))
[ 0.338725][ T0] startup_32_smp (arch/x86/kernel/head_32.S:290)
[ 0.339030][ T0] irq event stamp: 2667
[ 0.339652][ T0] hardirqs last enabled at (2677): __console_unlock (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:109 arch/x86/include/asm/irqflags.h:151 kernel/printk/printk.c:344 kernel/printk/printk.c:2885)
[ 0.340902][ T0] hardirqs last disabled at (2686): __console_unlock (kernel/printk/printk.c:342 (discriminator 9))
[ 0.342501][ T0] softirqs last enabled at (0): 0x0
[ 0.345464][ T0] softirqs last disabled at (0): 0x0
[ 0.346433][ T0] ---[ end trace 0000000000000000 ]---
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250528/202505280957.3efe5bf5-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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