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Date: Fri, 17 May 2024 15:03:20 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Miaohe Lin <linmiaohe@huawei.com>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, <linux-mm@kvack.org>,
	<akpm@linux-foundation.org>, <shy828301@gmail.com>,
	<nao.horiguchi@gmail.com>, <xuyu@linux.alibaba.com>, <linmiaohe@huawei.com>,
	<linux-kernel@vger.kernel.org>, <oliver.sang@intel.com>
Subject: Re: [PATCH -rc7] mm/huge_memory: mark huge_zero_page reserved
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Hello,

kernel test robot noticed "kernel_BUG_at_include/linux/page-flags.h" on:

commit: 8e6ff9c4aad2c677c53f70d9e193c35cbbafcb88 ("[PATCH -rc7] mm/huge_memory: mark huge_zero_page reserved")
url: https://github.com/intel-lab-lkp/linux/commits/Miaohe-Lin/mm-huge_memory-mark-huge_zero_page-reserved/20240511-115840
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git cf87f46fd34d6c19283d9625a7822f20d90b64a4
patch link: https://lore.kernel.org/all/20240511035435.1477004-1-linmiaohe@huawei.com/
patch subject: [PATCH -rc7] mm/huge_memory: mark huge_zero_page reserved

in testcase: trinity
version: trinity-i386-abe9de86-1_20230429
with following parameters:

	runtime: 300s
	group: group-03
	nr_groups: 5


compiler: gcc-13
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+------------------------------------------+------------+------------+
|                                          | cf87f46fd3 | 8e6ff9c4aa |
+------------------------------------------+------------+------------+
| kernel_BUG_at_include/linux/page-flags.h | 0          | 11         |
| invalid_opcode:#[##]                     | 0          | 11         |
| RIP:get_huge_zero_page                   | 0          | 11         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 11         |
+------------------------------------------+------------+------------+


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@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202405171417.1bb0856a-lkp@intel.com


[  272.633454][ T3838] ------------[ cut here ]------------
[  272.634362][ T3838] kernel BUG at include/linux/page-flags.h:540!
[  272.635422][ T3838] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
[  272.636518][ T3838] CPU: 0 PID: 3838 Comm: trinity-c2 Not tainted 6.9.0-rc7-00184-g8e6ff9c4aad2 #1
[  272.638008][ T3838] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 272.639707][ T3838] RIP: 0010:get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.650951][ T3838] Code: 04 02 00 00 00 65 ff 0d 0a 0b 75 7e 74 1e 65 48 ff 05 50 e5 74 7e e9 5c fe ff ff 48 c7 c6 a0 bb 52 83 48 89 df e8 64 89 f2 ff <0f> 0b 0f 1f 44 00 00 eb db 48 c7 c6 40 bc 52 83 48 89 df e8 4c 89
All code
========
   0:	04 02                	add    $0x2,%al
   2:	00 00                	add    %al,(%rax)
   4:	00 65 ff             	add    %ah,-0x1(%rbp)
   7:	0d 0a 0b 75 7e       	or     $0x7e750b0a,%eax
   c:	74 1e                	je     0x2c
   e:	65 48 ff 05 50 e5 74 	incq   %gs:0x7e74e550(%rip)        # 0x7e74e566
  15:	7e 
  16:	e9 5c fe ff ff       	jmp    0xfffffffffffffe77
  1b:	48 c7 c6 a0 bb 52 83 	mov    $0xffffffff8352bba0,%rsi
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 64 89 f2 ff       	call   0xfffffffffff2898e
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  31:	eb db                	jmp    0xe
  33:	48 c7 c6 40 bc 52 83 	mov    $0xffffffff8352bc40,%rsi
  3a:	48 89 df             	mov    %rbx,%rdi
  3d:	e8                   	.byte 0xe8
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   7:	eb db                	jmp    0xffffffffffffffe4
   9:	48 c7 c6 40 bc 52 83 	mov    $0xffffffff8352bc40,%rsi
  10:	48 89 df             	mov    %rbx,%rdi
  13:	e8                   	.byte 0xe8
  14:	4c                   	rex.WR
  15:	89                   	.byte 0x89
[  272.654159][ T3838] RSP: 0000:ffffc90001507988 EFLAGS: 00010246
[  272.655196][ T3838] RAX: 0000000000000000 RBX: ffffea00068d8000 RCX: 0000000000000000
[  272.656504][ T3838] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[  272.657799][ T3838] RBP: ffff8881b94fdf08 R08: 0000000000000000 R09: 0000000000000000
[  272.659142][ T3838] R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00043fb100
[  272.660533][ T3838] R13: ffff888109ecdb08 R14: ffffc90001507a70 R15: 0000000000100173
[  272.661849][ T3838] FS:  0000000000000000(0000) GS:ffff8883af200000(0063) knlGS:00000000f7f1a280
[  272.663303][ T3838] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[  272.664430][ T3838] CR2: 00000000ff7fffff CR3: 00000001ba4ca000 CR4: 00000000000406b0
[  272.665759][ T3838] Call Trace:
[  272.666325][ T3838]  <TASK>
[ 272.666824][ T3838] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 272.667483][ T3838] ? do_trap (arch/x86/kernel/traps.c:114 arch/x86/kernel/traps.c:155) 
[ 272.668253][ T3838] ? get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.669128][ T3838] ? get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.669985][ T3838] ? do_error_trap (arch/x86/kernel/traps.c:176) 
[ 272.670793][ T3838] ? get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.671731][ T3838] ? handle_invalid_op (arch/x86/kernel/traps.c:214) 
[ 272.672551][ T3838] ? get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.673411][ T3838] ? exc_invalid_op (arch/x86/kernel/traps.c:267) 
[ 272.674224][ T3838] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) 
[ 272.675064][ T3838] ? get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.679035][ T3838] ? get_huge_zero_page (include/linux/page-flags.h:540 (discriminator 1) mm/huge_memory.c:211 (discriminator 1)) 
[ 272.679922][ T3838] mm_get_huge_zero_page (mm/huge_memory.c:235 (discriminator 1)) 
[ 272.680764][ T3838] do_huge_pmd_anonymous_page (mm/huge_memory.c:1020) 
[ 272.681694][ T3838] ? mt_find (include/linux/rcupdate.h:339 (discriminator 1) include/linux/rcupdate.h:814 (discriminator 1) lib/maple_tree.c:6954 (discriminator 1)) 
[ 272.682432][ T3838] __handle_mm_fault (mm/memory.c:5175 mm/memory.c:5412) 
[ 272.683260][ T3838] ? handle_pte_fault (mm/memory.c:5352) 
[ 272.684150][ T3838] ? find_vma (mm/mmap.c:1889) 
[ 272.684891][ T3838] ? vma_link_file (mm/mmap.c:1889) 
[ 272.685676][ T3838] ? handle_mm_fault (mm/memory.c:5576) 
[ 272.686461][ T3838] handle_mm_fault (mm/memory.c:5466 mm/memory.c:5622) 
[ 272.687265][ T3838] do_user_addr_fault (arch/x86/mm/fault.c:1384) 
[ 272.688116][ T3838] exc_page_fault (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 arch/x86/mm/fault.c:1482 arch/x86/mm/fault.c:1532) 
[ 272.689202][ T3838] asm_exc_page_fault (arch/x86/include/asm/idtentry.h:623) 
[ 272.690523][ T3838] RIP: 0010:rep_movs_alternative (arch/x86/lib/copy_user_64.S:57) 
[ 272.692228][ T3838] Code: 83 f9 08 73 25 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <48> 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 db 83 f9 08
All code
========
   0:	83 f9 08             	cmp    $0x8,%ecx
   3:	73 25                	jae    0x2a
   5:	85 c9                	test   %ecx,%ecx
   7:	74 0f                	je     0x18
   9:	8a 06                	mov    (%rsi),%al
   b:	88 07                	mov    %al,(%rdi)
   d:	48 ff c7             	inc    %rdi
  10:	48 ff c6             	inc    %rsi
  13:	48 ff c9             	dec    %rcx
  16:	75 f1                	jne    0x9
  18:	c3                   	ret
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	cc                   	int3
  1c:	cc                   	int3
  1d:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  24:	00 00 00 00 
  28:	66 90                	xchg   %ax,%ax
  2a:*	48 8b 06             	mov    (%rsi),%rax		<-- trapping instruction
  2d:	48 89 07             	mov    %rax,(%rdi)
  30:	48 83 c6 08          	add    $0x8,%rsi
  34:	48 83 c7 08          	add    $0x8,%rdi
  38:	83 e9 08             	sub    $0x8,%ecx
  3b:	74 db                	je     0x18
  3d:	83 f9 08             	cmp    $0x8,%ecx

Code starting with the faulting instruction
===========================================
   0:	48 8b 06             	mov    (%rsi),%rax
   3:	48 89 07             	mov    %rax,(%rdi)
   6:	48 83 c6 08          	add    $0x8,%rsi
   a:	48 83 c7 08          	add    $0x8,%rdi
   e:	83 e9 08             	sub    $0x8,%ecx
  11:	74 db                	je     0xffffffffffffffee
  13:	83 f9 08             	cmp    $0x8,%ecx


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240517/202405171417.1bb0856a-lkp@intel.com


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki