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Date: Wed, 10 Jan 2024 23:01:14 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Markus Elfring <Markus.Elfring@web.de>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, <cgroups@vger.kernel.org>,
	<kernel-janitors@vger.kernel.org>, Johannes Weiner <hannes@cmpxchg.org>,
	Tejun Heo <tj@kernel.org>, Waiman Long <longman@redhat.com>, Zefan Li
	<lizefan.x@bytedance.com>, LKML <linux-kernel@vger.kernel.org>,
	<oliver.sang@intel.com>
Subject: Re: [PATCH] cgroup/cpuset: Adjust exception handling in
 generate_sched_domains()
Message-ID: <202401102216.c93598af-oliver.sang@intel.com>
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Hello,

kernel test robot noticed "canonical_address#:#[##]" on:

commit: 85f67f5f644dba9e15b9fa957f4af4745a330157 ("[PATCH] cgroup/cpuset: Adjust exception handling in generate_sched_domains()")
url: https://github.com/intel-lab-lkp/linux/commits/Markus-Elfring/cgroup-cpuset-Adjust-exception-handling-in-generate_sched_domains/20231231-152941
base: https://git.kernel.org/cgit/linux/kernel/git/tj/cgroup.git for-next
patch link: https://lore.kernel.org/all/53be5f98-6359-48b5-955e-fd203d99d3cb@web.de/
patch subject: [PATCH] cgroup/cpuset: Adjust exception handling in generate_sched_domains()

in testcase: cpu-hotplug
version: 
with following parameters:


compiler: gcc-12
test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (Kaby Lake) with 32G memory

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


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/202401102216.c93598af-oliver.sang@intel.com


[   32.391748][  T310] RESULT_ROOT=/result/cpu-hotplug/defaults/lkp-kbl-d01/debian-11.1-x86_64-20220510.cgz/x86_64-rhel-8.3-func/gcc-12/85f67f5f644dba9e15b9fa957f4af4745a330157/0
[   32.391787][  T310]
[   32.412091][  T310] job=/lkp/jobs/scheduled/lkp-kbl-d01/cpu-hotplug-defaults-debian-11.1-x86_64-20220510.cgz-85f67f5f644d-20240110-32485-1y7a2hd-0.yaml
[   32.412128][  T310]
[   32.449795][    T8] smpboot: CPU 1 is now offline
[   32.455650][  T230] general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN PTI
[   32.467476][  T230] KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
[   32.475678][  T230] CPU: 0 PID: 230 Comm: kworker/1:2 Not tainted 6.7.0-rc1-00370-g85f67f5f644d #1
[   32.484571][  T230] Hardware name: Dell Inc. OptiPlex 7050/062KRH, BIOS 1.2.0 12/22/2016
[   32.492601][  T230] Workqueue: events cpuset_hotplug_workfn
[ 32.498139][ T230] RIP: 0010:generate_sched_domains (kbuild/src/consumer/kernel/cgroup/cpuset.c:985) 
[ 32.504106][ T230] Code: b8 ff ff bf 05 00 00 00 e8 98 60 e6 ff 48 8b 54 24 20 4c 8b 25 64 fb 71 03 48 89 c3 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <80> 3c 02 00 0f 85 a1 08 00 00 48 ba 00 00 00 00 00 fc ff df 48 8b
All code
========
   0:	b8 ff ff bf 05       	mov    $0x5bfffff,%eax
   5:	00 00                	add    %al,(%rax)
   7:	00 e8                	add    %ch,%al
   9:	98                   	cwtl
   a:	60                   	(bad)
   b:	e6 ff                	out    %al,$0xff
   d:	48 8b 54 24 20       	mov    0x20(%rsp),%rdx
  12:	4c 8b 25 64 fb 71 03 	mov    0x371fb64(%rip),%r12        # 0x371fb7d
  19:	48 89 c3             	mov    %rax,%rbx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df 
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)		<-- trapping instruction
  2e:	0f 85 a1 08 00 00    	jne    0x8d5
  34:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  3b:	fc ff df 
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b

Code starting with the faulting instruction
===========================================
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	0f 85 a1 08 00 00    	jne    0x8ab
   a:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  11:	fc ff df 
  14:	48                   	rex.W
  15:	8b                   	.byte 0x8b
[   32.523422][  T230] RSP: 0000:ffffc900009afb58 EFLAGS: 00010202
[   32.529307][  T230] RAX: dffffc0000000000 RBX: ffffffff8546fa20 RCX: 0000000000000004
[   32.537078][  T230] RDX: 0000000000000002 RSI: ffffffff84bd2ac0 RDI: 0000000000000005
[   32.544847][  T230] RBP: ffff88810c9e4e10 R08: 0000000000000000 R09: fffffbfff097a571
[   32.552619][  T230] R10: ffffffff84bd2b8f R11: ffffffff819c9c87 R12: ffff88810c9e4c30
[   32.560388][  T230] R13: ffffffff85470010 R14: 1ffff92000135f84 R15: dffffc0000000000
[   32.568159][  T230] FS:  0000000000000000(0000) GS:ffff8887a5600000(0000) knlGS:0000000000000000
[   32.576877][  T230] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.583270][  T230] CR2: 000055eb6b0d5000 CR3: 000000081ac5a001 CR4: 00000000003706f0
[   32.591040][  T230] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   32.598811][  T230] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   32.606583][  T230] Call Trace:
[   32.609699][  T230]  <TASK>
[ 32.612477][ T230] ? die_addr (kbuild/src/consumer/arch/x86/kernel/dumpstack.c:421 kbuild/src/consumer/arch/x86/kernel/dumpstack.c:460) 
[ 32.616462][ T230] ? exc_general_protection (kbuild/src/consumer/arch/x86/kernel/traps.c:700 kbuild/src/consumer/arch/x86/kernel/traps.c:642) 
[ 32.621824][ T230] ? asm_exc_general_protection (kbuild/src/consumer/arch/x86/include/asm/idtentry.h:564) 
[ 32.627357][ T230] ? __kasan_kmalloc (kbuild/src/consumer/mm/kasan/common.c:374 kbuild/src/consumer/mm/kasan/common.c:383) 


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240110/202401102216.c93598af-oliver.sang@intel.com


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