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Date: Mon, 8 Jan 2024 21:53:41 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Xuewen Yan <xuewen.yan@unisoc.com>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, Zhiguo Niu
	<zhiguo.niu@unisoc.com>, <linux-kernel@vger.kernel.org>,
	<peterz@infradead.org>, <mingo@redhat.com>, <will@kernel.org>,
	<longman@redhat.com>, <boqun.feng@gmail.com>, <ke.wang@unisoc.com>,
	<oliver.sang@intel.com>
Subject: Re: [PATCH] lock/lockdep: Add missing graph_unlock in validate_chain
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Hello,

kernel test robot noticed "WARNING:at_kernel/locking/lockdep.c:#lock_acquire" on:

commit: 1033f8642b6ca8652763f95013e30ff1c220f3c9 ("[PATCH] lock/lockdep: Add missing graph_unlock in validate_chain")
url: https://github.com/intel-lab-lkp/linux/commits/Xuewen-Yan/lock-lockdep-Add-missing-graph_unlock-in-validate_chain/20240104-134335
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 67a1723344cfe05430977483d6d3c7a999480143
patch link: https://lore.kernel.org/all/20240104054030.14733-1-xuewen.yan@unisoc.com/
patch subject: [PATCH] lock/lockdep: Add missing graph_unlock in validate_chain

in testcase: boot

compiler: clang-17
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

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


+---------------------------------------------------------+------------+------------+
|                                                         | 67a1723344 | 1033f8642b |
+---------------------------------------------------------+------------+------------+
| WARNING:at_kernel/locking/lockdep.c:#lock_acquire       | 0          | 8          |
| EIP:lock_acquire                                        | 0          | 8          |
+---------------------------------------------------------+------------+------------+


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/202401082116.303fea3-oliver.sang@intel.com


[    0.755622][    T0] ------------[ cut here ]------------
[ 0.756871][ T0] WARNING: CPU: 0 PID: 0 at kernel/locking/lockdep.c:467 lock_acquire (kernel/locking/lockdep.c:467) 
[    0.757950][    T0] Modules linked in:
[    0.758418][    T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.7.0-rc8-00007-g1033f8642b6c #1
[    0.759457][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 0.760652][ T0] EIP: lock_acquire (kernel/locking/lockdep.c:467) 
[ 0.761215][ T0] Code: 03 c1 e3 10 8b 45 0c 83 e0 01 c1 e0 12 01 d8 05 00 40 08 00 89 45 e8 8d 55 d4 89 f9 56 e8 47 00 00 00 83 c4 04 e9 67 ff ff ff <0f> 0b b8 c8 51 6a c2 e8 b7 66 f7 00 c7 05 e4 50 8b c2 00 00 00 00
All code
========
   0:	03 c1                	add    %ecx,%eax
   2:	e3 10                	jrcxz  0x14
   4:	8b 45 0c             	mov    0xc(%rbp),%eax
   7:	83 e0 01             	and    $0x1,%eax
   a:	c1 e0 12             	shl    $0x12,%eax
   d:	01 d8                	add    %ebx,%eax
   f:	05 00 40 08 00       	add    $0x84000,%eax
  14:	89 45 e8             	mov    %eax,-0x18(%rbp)
  17:	8d 55 d4             	lea    -0x2c(%rbp),%edx
  1a:	89 f9                	mov    %edi,%ecx
  1c:	56                   	push   %rsi
  1d:	e8 47 00 00 00       	call   0x69
  22:	83 c4 04             	add    $0x4,%esp
  25:	e9 67 ff ff ff       	jmp    0xffffffffffffff91
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	b8 c8 51 6a c2       	mov    $0xc26a51c8,%eax
  31:	e8 b7 66 f7 00       	call   0xf766ed
  36:	c7 05 e4 50 8b c2 00 	movl   $0x0,-0x3d74af1c(%rip)        # 0xffffffffc28b5124
  3d:	00 00 00 

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	b8 c8 51 6a c2       	mov    $0xc26a51c8,%eax
   7:	e8 b7 66 f7 00       	call   0xf766c3
   c:	c7 05 e4 50 8b c2 00 	movl   $0x0,-0x3d74af1c(%rip)        # 0xffffffffc28b50fa
  13:	00 00 00 
[    0.763535][    T0] EAX: 00000000 EBX: 00200246 ECX: 00000000 EDX: 00000000
[    0.764339][    T0] ESI: 00000000 EDI: c2c299b4 EBP: c2877f3c ESP: c2877f10
[    0.765192][    T0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00210097
[    0.766057][    T0] CR0: 80050033 CR2: ffd96000 CR3: 02e96000 CR4: 00000090
[    0.766888][    T0] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[    0.767677][    T0] DR6: fffe0ff0 DR7: 00000400
[    0.768224][    T0] Call Trace:
[ 0.768615][ T0] ? show_regs (arch/x86/kernel/dumpstack.c:478) 
[ 0.769115][ T0] ? __warn (kernel/panic.c:236 kernel/panic.c:677) 
[ 0.769584][ T0] ? lock_acquire (kernel/locking/lockdep.c:467) 
[ 0.770147][ T0] ? report_bug (lib/bug.c:199) 
[ 0.770697][ T0] ? exc_overflow (arch/x86/kernel/traps.c:250) 
[ 0.771253][ T0] ? handle_bug (arch/x86/kernel/traps.c:237) 
[ 0.771781][ T0] ? exc_invalid_op (arch/x86/kernel/traps.c:258) 
[ 0.772375][ T0] ? handle_exception (arch/x86/entry/entry_32.S:1056) 
[ 0.772953][ T0] ? exc_overflow (arch/x86/kernel/traps.c:250) 
[ 0.773465][ T0] ? lock_acquire (kernel/locking/lockdep.c:467) 
[ 0.774005][ T0] ? exc_overflow (arch/x86/kernel/traps.c:250) 
[ 0.774531][ T0] ? lock_acquire (kernel/locking/lockdep.c:467) 
[ 0.775079][ T0] ? vprintk_emit (arch/x86/include/asm/preempt.h:104 kernel/printk/printk.c:3899 kernel/printk/printk.c:3914 kernel/printk/printk.c:2310) 
[ 0.775628][ T0] _raw_spin_lock (include/linux/spinlock_api_smp.h:133 kernel/locking/spinlock.c:154) 
[ 0.776177][ T0] ? AA_spin (lib/locking-selftest.c:310) 
[ 0.776678][ T0] AA_spin (lib/locking-selftest.c:310) 
[ 0.777139][ T0] dotest (lib/locking-selftest.c:1455) 
[ 0.777627][ T0] ? _printk (kernel/printk/printk.c:2331) 
[ 0.778068][ T0] locking_selftest (lib/locking-selftest.c:2821) 
[ 0.778571][ T0] start_kernel (init/main.c:1023) 
[ 0.779072][ T0] i386_start_kernel (arch/x86/kernel/head32.c:79) 
[ 0.779655][ T0] startup_32_smp (arch/x86/kernel/head_32.S:295) 
[    0.780199][    T0] irq event stamp: 221
[ 0.780678][ T0] hardirqs last enabled at (221): console_unlock (arch/x86/include/asm/irqflags.h:19 arch/x86/include/asm/irqflags.h:67 arch/x86/include/asm/irqflags.h:127 kernel/printk/printk.c:341 kernel/printk/printk.c:2706 kernel/printk/printk.c:3038) 
[ 0.781708][ T0] hardirqs last disabled at (220): console_unlock (kernel/printk/printk.c:339) 
[ 0.782687][ T0] softirqs last enabled at (0): 0x0 
[ 0.783367][ T0] softirqs last disabled at (0): 0x0 
[    0.783995][    T0] ---[ end trace 0000000000000000 ]---


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240108/202401082116.303fea3-oliver.sang@intel.com


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