linux-kernel - [mm/debug_vm_pgtable] 5b79c4a146: initcall_debug_vm_pgtable_returned_with_preemption

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Date:   Mon, 26 Jul 2021 15:19:11 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Gavin Shan <gshan@...hat.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        lkp@...ts.01.org, lkp@...el.com
Subject: [mm/debug_vm_pgtable]  5b79c4a146:
 initcall_debug_vm_pgtable_returned_with_preemption_imbalance



Greeting,

FYI, we noticed the following commit (built with gcc-10):

commit: 5b79c4a1469bcc5793a361ef57d5d2e2393cabcc ("mm/debug_vm_pgtable: introduce struct pgtable_debug_args")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master


in testcase: locktorture
version: 
with following parameters:

	runtime: 300s
	test: cpuhotplug

test-description: This torture test consists of creating a number of kernel threads which acquire the lock and hold it for specific amount of time, thus simulating different critical region behaviors.
test-url: https://www.kernel.org/doc/Documentation/locking/locktorture.txt


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

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+--------------------------------------------------------------+------------+------------+
|                                                              | a9aac8ea55 | 5b79c4a146 |
+--------------------------------------------------------------+------------+------------+
| initcall_debug_vm_pgtable_returned_with_preemption_imbalance | 0          | 6          |
| WARNING:at_init/main.c:#do_one_initcall                      | 0          | 6          |
| EIP:do_one_initcall                                          | 0          | 6          |
| Kernel_panic-not_syncing:No_working_init_found               | 0          | 6          |
+--------------------------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>


[   38.527560][    T1] ------------[ cut here ]------------
[   38.528444][    T1] initcall debug_vm_pgtable+0x0/0x3cd returned with preemption imbalance
[   38.529965][    T1] WARNING: CPU: 0 PID: 1 at init/main.c:1295 do_one_initcall+0x227/0x2c0
[   38.531240][    T1] Modules linked in:
[   38.531871][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W         5.14.0-rc2-00027-g5b79c4a1469b #1 a0a7f3ec31aa9416e222f7109d2330341e30c9
4a
[   38.533875][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
[   38.535237][    T1] EIP: do_one_initcall+0x227/0x2c0
[   38.536044][    T1] Code: 64 ff 0d 0c 67 ab c3 0f 85 2d fe ff ff e8 69 4a 6a 01 e9 23 fe ff ff 8d 74 26 00 8d 45 b4 50 56 68 5c 2a 06 c3 e8 6d ce 58 0
1 <0f> 0b 83 c4 0c e9 64 fe ff ff 8d b4 26 00 00 00 00 64 a1 5c 14 ab
[   38.538745][    T1] EAX: 00000047 EBX: 00000000 ECX: 00000000 EDX: 00000001
[   38.539813][    T1] ESI: c39a68f4 EDI: 00000000 EBP: c4d47f74 ESP: c4d47f1c
[   38.540841][    T1] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010296
[   38.542035][    T1] CR0: 80050033 CR2: b7dcbbf0 CR3: 03ad9000 CR4: 000406d0
[   38.543178][    T1] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   38.544210][    T1] DR6: fffe0ff0 DR7: 00000400
[   38.544931][    T1] Call Trace:
[   38.545505][    T1]  ? pmd_advanced_tests+0x14d/0x14d
[   38.546318][    T1]  ? lock_is_held_type+0xc6/0x120
[   38.547089][    T1]  ? rcu_read_lock_sched_held+0x41/0x80
[   38.547929][    T1]  do_initcalls+0xf9/0x11b
[   38.548631][    T1]  kernel_init_freeable+0xc5/0xf4
[   38.549427][    T1]  ? rest_init+0x260/0x260
[   38.550123][    T1]  kernel_init+0x17/0xf0
[   38.550804][    T1]  ret_from_fork+0x1c/0x30
[   38.551499][    T1] irq event stamp: 16309295
[   38.552220][    T1] hardirqs last  enabled at (16309305): [<c10e8f1e>] console_unlock+0x27e/0x3b0
[   38.553556][    T1] hardirqs last disabled at (16309312): [<c10e8fa5>] console_unlock+0x305/0x3b0
[   38.554902][    T1] softirqs last  enabled at (16309200): [<c26a5060>] __do_softirq+0x2f0/0x4fa
[   38.556235][    T1] softirqs last disabled at (16309091): [<c102a885>] call_on_stack+0x45/0x50
[   38.557543][    T1] ---[ end trace 0025ffb206fe1364 ]---



To reproduce:

        # build kernel
	cd linux
	cp config-5.14.0-rc2-00027-g5b79c4a1469b .config
	make HOSTCC=gcc-10 CC=gcc-10 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-10 CC=gcc-10 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email



---
0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
https://lists.01.org/hyperkitty/list/lkp@lists.01.org       Intel Corporation

Thanks,
Oliver Sang


View attachment "config-5.14.0-rc2-00027-g5b79c4a1469b" of type "text/plain" (153013 bytes)

View attachment "job-script" of type "text/plain" (4501 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (21200 bytes)