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Date: Mon, 25 Mar 2024 14:00:06 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Ingo Molnar <mingo@kernel.org>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, Andy Lutomirski
	<luto@kernel.org>, Borislav Petkov <bp@alien8.de>, "H. Peter Anvin"
	<hpa@zytor.com>, Linus Torvalds <torvalds@linux-foundation.org>, "Oleg
 Nesterov" <oleg@redhat.com>, Dave Hansen <dave.hansen@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>, Uros Bizjak <ubizjak@gmail.com>,
	<linux-kernel@vger.kernel.org>, Andy Lutomirski <luto@amacapital.net>, Andrew
 Morton <akpm@linux-foundation.org>, Dave Hansen <dave@sr71.net>, Peter
 Zijlstra <peterz@infradead.org>, <oliver.sang@intel.com>
Subject: Re: [PATCH 1/1] headers/deps: x86/fpu: Make task_struct::thread
 constant size
Message-ID: <202403251006.3568d460-lkp@intel.com>
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Hello,

kernel test robot noticed "WARNING:at_arch/x86/mm/extable.c:#fixup_exception" on:

commit: 9738bc8321cc5abbab8676f6c1eb1b8c7c3d172d ("[PATCH 1/1] headers/deps: x86/fpu: Make task_struct::thread constant size")
url: https://github.com/intel-lab-lkp/linux/commits/Ingo-Molnar/headers-deps-x86-fpu-Make-task_struct-thread-constant-size/20240320-212236
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 35ce64922c8263448e58a2b9e8d15a64e11e9b2d
patch link: https://lore.kernel.org/all/20240320131908.2708438-2-mingo@kernel.org/
patch subject: [PATCH 1/1] headers/deps: x86/fpu: Make task_struct::thread constant size

in testcase: boot

compiler: gcc-12
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+---------------------------------------------------------------------------+------------+------------+
|                                                                           | 35ce64922c | 9738bc8321 |
+---------------------------------------------------------------------------+------------+------------+
| WARNING:at_arch/x86/mm/extable.c:#fixup_exception                         | 0          | 17         |
| EIP:fixup_exception                                                       | 0          | 17         |
| EIP:restore_fpregs_from_fpstate                                           | 0          | 17         |
| WARNING:at_arch/x86/kernel/fpu/xstate.h:#os_xsave                         | 0          | 17         |
| EIP:os_xsave                                                              | 0          | 17         |
| kernel_BUG_at_mm/usercopy.c                                               | 0          | 17         |
| invalid_opcode:#[##]                                                      | 0          | 17         |
| EIP:usercopy_abort                                                        | 0          | 17         |
| Kernel_panic-not_syncing:Fatal_exception                                  | 0          | 17         |
+---------------------------------------------------------------------------+------------+------------+


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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202403251006.3568d460-lkp@intel.com


[    7.844011][   T58] ------------[ cut here ]------------
[ 7.844665][ T58] Bad FPU state detected at restore_fpregs_from_fpstate+0x3d/0x88, reinitializing FPU registers. 
[ 7.844686][ T58] WARNING: CPU: 0 PID: 58 at arch/x86/mm/extable.c:126 fixup_exception (arch/x86/mm/extable.c:126 arch/x86/mm/extable.c:275) 
[    7.846556][   T58] Modules linked in:
[    7.846556][   T58] CPU: 0 PID: 58 Comm: modprobe Tainted: G        W          6.8.0-rc4-00056-g9738bc8321cc #1
[    7.846556][   T58] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 7.846556][ T58] EIP: fixup_exception (arch/x86/mm/extable.c:126 arch/x86/mm/extable.c:275) 
[ 7.846556][ T58] Code: 88 0d a4 50 22 ce e8 9b 07 01 00 0f 0b e9 a8 fe ff ff 89 44 24 04 b2 01 c7 04 24 68 29 a9 cd 88 15 a6 50 22 ce e8 7c 07 01 00 <0f> 0b e9 c0 fe ff ff 0f 0b ba 88 f8 38 ce e9 e9 fe ff ff 8d 74 26
All code
========
   0:	88 0d a4 50 22 ce    	mov    %cl,-0x31ddaf5c(%rip)        # 0xffffffffce2250aa
   6:	e8 9b 07 01 00       	call   0x107a6
   b:	0f 0b                	ud2
   d:	e9 a8 fe ff ff       	jmp    0xfffffffffffffeba
  12:	89 44 24 04          	mov    %eax,0x4(%rsp)
  16:	b2 01                	mov    $0x1,%dl
  18:	c7 04 24 68 29 a9 cd 	movl   $0xcda92968,(%rsp)
  1f:	88 15 a6 50 22 ce    	mov    %dl,-0x31ddaf5a(%rip)        # 0xffffffffce2250cb
  25:	e8 7c 07 01 00       	call   0x107a6
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	e9 c0 fe ff ff       	jmp    0xfffffffffffffef1
  31:	0f 0b                	ud2
  33:	ba 88 f8 38 ce       	mov    $0xce38f888,%edx
  38:	e9 e9 fe ff ff       	jmp    0xffffffffffffff26
  3d:	8d                   	.byte 0x8d
  3e:	74 26                	je     0x66

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	e9 c0 fe ff ff       	jmp    0xfffffffffffffec7
   7:	0f 0b                	ud2
   9:	ba 88 f8 38 ce       	mov    $0xce38f888,%edx
   e:	e9 e9 fe ff ff       	jmp    0xfffffffffffffefc
  13:	8d                   	.byte 0x8d
  14:	74 26                	je     0x3c
[    7.846556][   T58] EAX: 00000000 EBX: cdc38510 ECX: 00000000 EDX: 00000000
[    7.846556][   T58] ESI: ea1abef0 EDI: 0000000d EBP: ea1abe5c ESP: ea1abde0
[    7.846556][   T58] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010046
[    7.846556][   T58] CR0: 80050033 CR2: bfda18db CR3: 29d1d000 CR4: 00040690
[    7.846556][   T58] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[    7.846556][   T58] DR6: fffe0ff0 DR7: 00000400
[    7.846556][   T58] Call Trace:
[ 7.846556][ T58] ? show_regs (arch/x86/kernel/dumpstack.c:479) 
[ 7.846556][ T58] ? fixup_exception (arch/x86/mm/extable.c:126 arch/x86/mm/extable.c:275) 
[ 7.846556][ T58] ? __warn (kernel/panic.c:677) 
[ 7.846556][ T58] ? fixup_exception (arch/x86/mm/extable.c:126 arch/x86/mm/extable.c:275) 
[ 7.846556][ T58] ? report_bug (lib/bug.c:180 lib/bug.c:219) 
[ 7.846556][ T58] ? exc_overflow (arch/x86/kernel/traps.c:251) 
[ 7.846556][ T58] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 7.846556][ T58] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 7.846556][ T58] ? handle_exception (arch/x86/entry/entry_32.S:1049) 
[ 7.846556][ T58] ? rt_mutex_debug_task_free (kernel/locking/rtmutex_api.c:487 (discriminator 11)) 
[ 7.846556][ T58] ? set_memory_global (arch/x86/mm/pat/set_memory.c:2298) 
[ 7.846556][ T58] ? exc_overflow (arch/x86/kernel/traps.c:251) 
[ 7.846556][ T58] ? fixup_exception (arch/x86/mm/extable.c:126 arch/x86/mm/extable.c:275) 
[ 7.846556][ T58] ? set_memory_global (arch/x86/mm/pat/set_memory.c:2298) 
[ 7.846556][ T58] ? exc_overflow (arch/x86/kernel/traps.c:251) 
[ 7.846556][ T58] ? fixup_exception (arch/x86/mm/extable.c:126 arch/x86/mm/extable.c:275) 
[ 7.846556][ T58] ? restore_fpregs_from_fpstate (arch/x86/kernel/fpu/core.c:188) 
[ 7.846556][ T58] ? __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 7.846556][ T58] ? __delete_object (mm/kmemleak.c:798 (discriminator 3)) 
[ 7.846556][ T58] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) 
[ 7.846556][ T58] ? sched_clock_noinstr (arch/x86/kernel/tsc.c:267) 
[ 7.846556][ T58] ? local_clock_noinstr (kernel/sched/clock.c:282 kernel/sched/clock.c:306) 
[ 7.846556][ T58] ? exc_bounds (arch/x86/kernel/traps.c:643) 
[ 7.846556][ T58] exc_general_protection (arch/x86/kernel/traps.c:617 arch/x86/kernel/traps.c:677 arch/x86/kernel/traps.c:643) 
[ 7.846556][ T58] ? __delete_object (mm/kmemleak.c:798 (discriminator 3)) 
[ 7.846556][ T58] ? exc_bounds (arch/x86/kernel/traps.c:643) 
[ 7.846556][ T58] handle_exception (arch/x86/entry/entry_32.S:1049) 
[ 7.846556][ T58] EIP: restore_fpregs_from_fpstate (arch/x86/kernel/fpu/core.c:188) 
[ 7.846556][ T58] Code: eb 0a cc cc cc db e2 0f 77 db 45 f4 3e 8d 74 26 00 8b 3d ec f1 bc cd 8b 4d f4 8b 1d e8 f1 bc cd 21 fa 8d 79 40 21 d8 0f ae 2f <8b> 5d f8 8b 7d fc 89 ec 5d 31 c0 31 d2 31 c9 c3 8d 76 00 3e 8d 74
All code
========
   0:	eb 0a                	jmp    0xc
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	db e2                	fnclex
   7:	0f 77                	emms
   9:	db 45 f4             	fildl  -0xc(%rbp)
   c:	3e 8d 74 26 00       	ds lea 0x0(%rsi,%riz,1),%esi
  11:	8b 3d ec f1 bc cd    	mov    -0x32430e14(%rip),%edi        # 0xffffffffcdbcf203
  17:	8b 4d f4             	mov    -0xc(%rbp),%ecx
  1a:	8b 1d e8 f1 bc cd    	mov    -0x32430e18(%rip),%ebx        # 0xffffffffcdbcf208
  20:	21 fa                	and    %edi,%edx
  22:	8d 79 40             	lea    0x40(%rcx),%edi
  25:	21 d8                	and    %ebx,%eax
  27:	0f ae 2f             	xrstor (%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:	31 c0                	xor    %eax,%eax
  35:	31 d2                	xor    %edx,%edx
  37:	31 c9                	xor    %ecx,%ecx
  39:	c3                   	ret
  3a:	8d 76 00             	lea    0x0(%rsi),%esi
  3d:	3e                   	ds
  3e:	8d                   	.byte 0x8d
  3f:	74                   	.byte 0x74

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:	31 c0                	xor    %eax,%eax
   b:	31 d2                	xor    %edx,%edx
   d:	31 c9                	xor    %ecx,%ecx
   f:	c3                   	ret
  10:	8d 76 00             	lea    0x0(%rsi),%esi
  13:	3e                   	ds
  14:	8d                   	.byte 0x8d
  15:	74                   	.byte 0x74
[    7.846556][   T58] EAX: 00000007 EBX: 00000007 ECX: c2d836e0 EDX: 00000000
[    7.846556][   T58] ESI: c2d836a0 EDI: c2d83720 EBP: ea1abf58 ESP: ea1abf4c
[    7.846556][   T58] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010002
[ 7.846556][ T58] ? exc_bounds (arch/x86/kernel/traps.c:643) 
[ 7.846556][ T58] ? restore_fpregs_from_fpstate (arch/x86/kernel/fpu/core.c:179 arch/x86/kernel/fpu/core.c:181) 
[ 7.846556][ T58] switch_fpu_return (arch/x86/include/asm/atomic.h:23 include/linux/atomic/atomic-arch-fallback.h:457 include/linux/jump_label.h:260 include/linux/jump_label.h:270 arch/x86/include/asm/trace/fpu.h:57 arch/x86/kernel/fpu/context.h:50 arch/x86/kernel/fpu/context.h:76 arch/x86/kernel/fpu/core.c:788) 
[ 7.846556][ T58] syscall_exit_to_user_mode (arch/x86/include/asm/entry-common.h:58 include/linux/entry-common.h:330 kernel/entry/common.c:201 kernel/entry/common.c:212) 
[ 7.846556][ T58] ? call_usermodehelper_exec_async (kernel/umh.c:114) 
[ 7.846556][ T58] ? call_usermodehelper (kernel/umh.c:65) 
[ 7.846556][ T58] ret_from_fork (arch/x86/kernel/process.c:157) 
[ 7.846556][ T58] ? call_usermodehelper (kernel/umh.c:65) 
[ 7.846556][ T58] ret_from_fork_asm (arch/x86/entry/entry_32.S:741) 
[ 7.846556][ T58] entry_INT80_32 (arch/x86/entry/entry_32.S:947) 
[    7.846556][   T58] EIP: 0xb7ee70b0
[ 7.846556][ T58] Code: Unable to access opcode bytes at 0xb7ee7086.

Code starting with the faulting instruction
===========================================


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240325/202403251006.3568d460-lkp@intel.com


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