Bad FPU state detected at restore_fpregs_from_fpstate, reinitializing FPU registers. WARNING: at arch/x86/mm/extable.c:127 fixup_exception

From: Naresh Kamboju
Date: Wed Jun 12 2024 - 07:57:02 EST

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The following kernel warnings are noticed on i386 running Linux next-20240612
tag while booting the ftrace enabled kernel.
This is always reproducible kernel warning with i386.
( when running the i386 kernel on an x86 machine I always do this)

Extra Kconfig:
CONFIG_FTRACE_SYSCALLS=y

Bad FPU state detected at restore_fpregs_from_fpstate+0x3d/0x74,
reinitializing FPU registers.
WARNING: CPU: 0 PID: 1 at arch/x86/mm/extable.c:127 fixup_exception+0x41e/0x45c

Reported-by: Linux Kernel Functional Testing <lkft@xxxxxxxxxx>

The detailed test log and build log links provided in the bottom of this email.

Boot:
-------
Linux version 6.10.0-rc3-next-20240612 (tuxmake@tuxmake)
(i686-linux-gnu-gcc (Debian 13.2.0-12) 13.2.0, GNU ld (GNU Binutils
for Debian) 2.42) #1 SMP PREEMPT_DYNAMIC @1718178142
...
[ 15.714445] Run /sbin/init as init process
[ 15.728653] ------------[ cut here ]------------
[ 15.733278] Bad FPU state detected at
restore_fpregs_from_fpstate+0x3d/0x74, reinitializing FPU registers.
[ 15.733285] WARNING: CPU: 1 PID: 1 at arch/x86/mm/extable.c:127
fixup_exception (arch/x86/mm/extable.c:127 (discriminator 2)
arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733289] Modules linked in:
[ 15.733291] CPU: 1 PID: 1 Comm: init Not tainted 6.10.0-rc3-next-20240612 #1
[ 15.733293] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.7 12/07/2021
[ 15.733294] EIP: fixup_exception (arch/x86/mm/extable.c:127
(discriminator 2) arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733296] Code: e8 03 ed 00 00 0f 0b eb cb 0f 0b ba 4c 59 53 d2 eb
b6 b2 01 88 15 c0 d3 38 d2 89 44 24 04 c7 04 24 d8 17 fd d1 e8 de ec
00 00 <0f> 0b e9 ee fd ff ff 8d b4 26 00 00 00 00 0f 0b ba 4c 59 53 d2
e9
All code
========
0: e8 03 ed 00 00 callq 0xed08
5: 0f 0b ud2
7: eb cb jmp 0xffffffffffffffd4
9: 0f 0b ud2
b: ba 4c 59 53 d2 mov $0xd253594c,%edx
10: eb b6 jmp 0xffffffffffffffc8
12: b2 01 mov $0x1,%dl
14: 88 15 c0 d3 38 d2 mov %dl,-0x2dc72c40(%rip) #
0xffffffffd238d3da
1a: 89 44 24 04 mov %eax,0x4(%rsp)
1e: c7 04 24 d8 17 fd d1 movl $0xd1fd17d8,(%rsp)
25: e8 de ec 00 00 callq 0xed08
2a:* 0f 0b ud2 <-- trapping instruction
2c: e9 ee fd ff ff jmpq 0xfffffffffffffe1f
31: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
38: 0f 0b ud2
3a: ba 4c 59 53 d2 mov $0xd253594c,%edx
3f: e9 .byte 0xe9

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: e9 ee fd ff ff jmpq 0xfffffffffffffdf5
7: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi
e: 0f 0b ud2
10: ba 4c 59 53 d2 mov $0xd253594c,%edx
15: e9 .byte 0xe9
[ 15.733298] EAX: 0000005e EBX: d2159678 ECX: 00000000 EDX: 00000002
[ 15.733299] ESI: c11efee8 EDI: 0000000d EBP: c11efe50 ESP: c11efdd0
[ 15.733300] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010086
[ 15.733302] CR0: 80050033 CR2: bfec4aab CR3: 02abc000 CR4: 003506d0
[ 15.733303] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 15.733304] DR6: fffe0ff0 DR7: 00000400
[ 15.733304] Call Trace:
[ 15.733306] ? show_regs (arch/x86/kernel/dumpstack.c:479)
[ 15.733308] ? fixup_exception (arch/x86/mm/extable.c:127
(discriminator 2) arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733310] ? __warn (kernel/panic.c:742)
[ 15.733313] ? fixup_exception (arch/x86/mm/extable.c:127
(discriminator 2) arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733314] ? fixup_exception (arch/x86/mm/extable.c:127
(discriminator 2) arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733316] ? report_bug (lib/bug.c:180 lib/bug.c:219)
[ 15.733320] ? exc_overflow (arch/x86/kernel/traps.c:252)
[ 15.733321] ? handle_bug (arch/x86/kernel/traps.c:218)
[ 15.733323] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1))
[ 15.733324] ? console_unlock (kernel/printk/printk.c:3137 (discriminator 1))
[ 15.733326] ? handle_exception (arch/x86/entry/entry_32.S:1054)
[ 15.733329] ? software_resume (kernel/power/hibernate.c:1024)
[ 15.733332] ? set_pages_rw (arch/x86/mm/pat/set_memory.c:2356)
[ 15.733334] ? exc_overflow (arch/x86/kernel/traps.c:252)
[ 15.733336] ? fixup_exception (arch/x86/mm/extable.c:127
(discriminator 2) arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733337] ? set_pages_rw (arch/x86/mm/pat/set_memory.c:2356)
[ 15.733340] ? exc_overflow (arch/x86/kernel/traps.c:252)
[ 15.733341] ? fixup_exception (arch/x86/mm/extable.c:127
(discriminator 2) arch/x86/mm/extable.c:340 (discriminator 2))
[ 15.733342] ? restore_fpregs_from_fpstate (arch/x86/kernel/fpu/core.c:198)
[ 15.733344] ? mt_find (lib/maple_tree.c:6956)
[ 15.733347] ? get_random_u32 (arch/x86/include/asm/irqflags.h:42
arch/x86/include/asm/irqflags.h:77 arch/x86/include/asm/irqflags.h:135
drivers/char/random.c:532)
[ 15.733349] ? _raw_spin_unlock
(include/linux/spinlock_api_smp.h:143 (discriminator 3)
kernel/locking/spinlock.c:186 (discriminator 3))
[ 15.733350] ? finalize_exec (fs/exec.c:1497)
[ 15.733352] ? trace_preempt_on (kernel/trace/trace_preemptirq.c:105)
[ 15.733354] ? finalize_exec (fs/exec.c:1497)
[ 15.733355] ? exc_bounds (arch/x86/kernel/traps.c:644)
[ 15.733356] exc_general_protection (arch/x86/kernel/traps.c:618
(discriminator 1) arch/x86/kernel/traps.c:678 (discriminator 1)
arch/x86/kernel/traps.c:644 (discriminator 1))
[ 15.733357] ? finalize_exec (fs/exec.c:1497)
[ 15.733359] ? exc_bounds (arch/x86/kernel/traps.c:644)
[ 15.733361] handle_exception (arch/x86/entry/entry_32.S:1054)
[ 15.733363] EIP: restore_fpregs_from_fpstate (arch/x86/kernel/fpu/core.c:198)
[ 15.733364] Code: 7d fc 89 ca eb 09 cc cc cc db e2 0f 77 db 03 3e 8d
74 26 00 8b 3d ac 82 0b d2 8b 0d a8 82 0b d2 21 fa 8d 7b 40 21 c8 0f
c7 1f <8b> 5d f8 8b 7d fc 89 ec 5d c3 2e 8d 74 26 00 3e 8d 74 26 00 0f
ae
All code
========
0: 7d fc jge 0xfffffffffffffffe
2: 89 ca mov %ecx,%edx
4: eb 09 jmp 0xf
6: cc int3
7: cc int3
8: cc int3
9: db e2 fnclex
b: 0f 77 emms
d: db 03 fildl (%rbx)
f: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi
14: 8b 3d ac 82 0b d2 mov -0x2df47d54(%rip),%edi #
0xffffffffd20b82c6
1a: 8b 0d a8 82 0b d2 mov -0x2df47d58(%rip),%ecx #
0xffffffffd20b82c8
20: 21 fa and %edi,%edx
22: 8d 7b 40 lea 0x40(%rbx),%edi
25: 21 c8 and %ecx,%eax
27: 0f c7 1f xrstors (%rdi)
2a:* 8b 5d f8 mov -0x8(%rbp),%ebx <-- trapping instruction
2d: 8b 7d fc mov -0x4(%rbp),%edi
30: 89 ec mov %ebp,%esp
32: 5d pop %rbp
33: c3 retq
34: 2e 8d 74 26 00 lea %cs:0x0(%rsi,%riz,1),%esi
39: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi
3e: 0f .byte 0xf
3f: ae scas %es:(%rdi),%al

Code starting with the faulting instruction
===========================================
0: 8b 5d f8 mov -0x8(%rbp),%ebx
3: 8b 7d fc mov -0x4(%rbp),%edi
6: 89 ec mov %ebp,%esp
8: 5d pop %rbp
9: c3 retq
a: 2e 8d 74 26 00 lea %cs:0x0(%rsi,%riz,1),%esi
f: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi
14: 0f .byte 0xf
15: ae scas %es:(%rdi),%al
[ 15.733366] EAX: 0000001f EBX: c12288e0 ECX: 0000001f EDX: 00000000
[ 15.733367] ESI: c1228000 EDI: c1228920 EBP: c11eff4c ESP: c11eff44
[ 15.733368] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010002
[ 15.733369] ? __do_sys_newstat (fs/stat.c:439)
[ 15.733372] ? exc_bounds (arch/x86/kernel/traps.c:644)
[ 15.733373] ? exc_bounds (arch/x86/kernel/traps.c:644)
[ 15.733374] ? restore_fpregs_from_fpstate
(arch/x86/kernel/fpu/xstate.h:209 arch/x86/kernel/fpu/core.c:191)
[ 15.733376] fpregs_restore_userregs
(arch/x86/kernel/fpu/context.h:49 (discriminator 4)
arch/x86/kernel/fpu/context.h:76 (discriminator 4))
[ 15.733378] switch_fpu_return (arch/x86/kernel/fpu/core.c:802)
[ 15.733380] syscall_exit_to_user_mode
(arch/x86/include/asm/entry-common.h:58
include/linux/entry-common.h:330 kernel/entry/common.c:207
kernel/entry/common.c:218)
[ 15.733382] ? rest_init (init/main.c:1459)
[ 15.733383] ? kernel_init (init/main.c:1397 init/main.c:1523)
[ 15.733385] ? rest_init (init/main.c:1459)
[ 15.733387] ret_from_fork (arch/x86/kernel/process.c:154)
[ 15.733388] ? rest_init (init/main.c:1459)
[ 15.733390] ret_from_fork_asm (arch/x86/entry/entry_32.S:737)
[ 15.733391] entry_INT80_32 (arch/x86/entry/entry_32.S:944)
[ 15.733393] EIP: 0xb7f175b0
[ 15.733396] Code: Unable to access opcode bytes at 0xb7f17586.

Code starting with the faulting instruction
===========================================
[ 15.733396] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: 00000000
[ 15.733397] ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: bfec49b0
[ 15.733398] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 007b EFLAGS: 00000200
[ 15.733400] ---[ end trace 0000000000000000 ]---
[ 16.074973] ------------[ cut here ]------------
[ 16.079626] WARNING: CPU: 1 PID: 1 at
arch/x86/kernel/fpu/xstate.h:195 save_fpregs_to_fpstate
(arch/x86/kernel/fpu/xstate.h:195 (discriminator 1)
arch/x86/kernel/fpu/core.c:128 (discriminator 1))
[ 16.079629] Modules linked in:
[ 16.079630] CPU: 1 PID: 1 Comm: init Tainted: G W
6.10.0-rc3-next-20240612 #1
[ 16.079632] Tainted: [W]=WARN
[ 16.079632] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.7 12/07/2021
[ 16.079633] EIP: save_fpregs_to_fpstate
(arch/x86/kernel/fpu/xstate.h:195 (discriminator 1)
arch/x86/kernel/fpu/core.c:128 (discriminator 1))
[ 16.079634] Code: f8 8b 7d fc 89 ec 5d c3 66 90 8b 40 08 dd 70 40 9b
8b 43 08 dd 60 40 8b 5d f8 8b 7d fc 89 ec 5d c3 2e 8d b4 26 00 00 00
00 90 <0f> 0b eb 9b 8d 74 26 00 0f 0b eb 87 3e 8d 74 26 00 55 89 e5 83
ec
All code
========
0: f8 clc
1: 8b 7d fc mov -0x4(%rbp),%edi
4: 89 ec mov %ebp,%esp
6: 5d pop %rbp
7: c3 retq
8: 66 90 xchg %ax,%ax
a: 8b 40 08 mov 0x8(%rax),%eax
d: dd 70 40 fnsave 0x40(%rax)
10: 9b fwait
11: 8b 43 08 mov 0x8(%rbx),%eax
14: dd 60 40 frstor 0x40(%rax)
17: 8b 5d f8 mov -0x8(%rbp),%ebx
1a: 8b 7d fc mov -0x4(%rbp),%edi
1d: 89 ec mov %ebp,%esp
1f: 5d pop %rbp
20: c3 retq
21: 2e 8d b4 26 00 00 00 lea %cs:0x0(%rsi,%riz,1),%esi
28: 00
29: 90 nop
2a:* 0f 0b ud2 <-- trapping instruction
2c: eb 9b jmp 0xffffffffffffffc9
2e: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi
32: 0f 0b ud2
34: eb 87 jmp 0xffffffffffffffbd
36: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi
3b: 55 push %rbp
3c: 89 e5 mov %esp,%ebp
3e: 83 .byte 0x83
3f: ec in (%dx),%al

Code starting with the faulting instruction
===========================================
0: 0f 0b ud2
2: eb 9b jmp 0xffffffffffffff9f
4: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi
8: 0f 0b ud2
a: eb 87 jmp 0xffffffffffffff93
c: 3e 8d 74 26 00 lea %ds:0x0(%rsi,%riz,1),%esi
11: 55 push %rbp
12: 89 e5 mov %esp,%ebp
14: 83 .byte 0x83
15: ec in (%dx),%al
[ 16.079636] EAX: 0000001f EBX: c12288a0 ECX: c12288e0 EDX: 00000000
[ 16.079637] ESI: c1228000 EDI: fffffff2 EBP: c1221ed0 ESP: c1221ec8
[ 16.079637] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010082
[ 16.079639] CR0: 80050033 CR2: b7f17586 CR3: 02abc000 CR4: 003506d0
[ 16.079640] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 16.079640] DR6: fffe0ff0 DR7: 00000400
[ 16.079641] Call Trace:
[ 16.079641] ---[ end trace 0000000000000000 ]---

metadata:
---
git_describe: next-20240612
git_ref: master
git_rep: ohttps://gitlab.com/Linaro/lkft/mirrors/next/linux-next
git_sha: 03d44168cbd7fc57d5de56a3730427db758fc7f6
arch: i386
toolchain: gcc-13

Links:
----
- https://lkft.validation.linaro.org/scheduler/job/7658521#L1067
- https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20240612/testrun/24277698/suite/log-parser-boot/test/check-kernel-warning-ff46c8024e8b2af96107ccfc90c52489f57275260d87c4955245aefd26dd9d60/details/
- https://storage.tuxsuite.com/public/linaro/lkft/builds/2hlo6h03yVTVuYB6mf8ZHEdZISJ/

--
Linaro LKFT
https://lkft.linaro.org

Next message: Jiaxun Yang: "[PATCH v2 0/8] MIPS: Boston: Fix syscon devicetree binding and node"
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Next in thread: Dave Hansen: "Re: Bad FPU state detected at restore_fpregs_from_fpstate, reinitializing FPU registers. WARNING: at arch/x86/mm/extable.c:127 fixup_exception"
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