linux-kernel - [PCI/PM] 5bffe4c611: BUG:kernel_reboot-without-warning_in_test

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Date:   Fri, 29 Apr 2022 11:31:34 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
        lkp@...ts.01.org, lkp@...el.com
Subject: [PCI/PM]  5bffe4c611: BUG:kernel_reboot-without-warning_in_test_stage



Greeting,

FYI, we noticed the following commit (built with clang-15):

commit: 5bffe4c611f567d83c579378c54b13c21fd0fb98 ("PCI/PM: Rework changing power states of PCI devices")
https://git.kernel.org/cgit/linux/kernel/git/helgaas/pci.git pci/pm

in testcase: boot

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

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



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



please be noted, since we didn't find direct clue to the issue caused by this
commit, while making sure the config is same for it and parent, we rerun more
times. we observed there is a 25% rate on this commit, but keeps clean on
parent.

e8a37022c16ae719 5bffe4c611f567d83c579378c54
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :100         25%          25:100   dmesg.BUG:kernel_reboot-without-warning_in_test_stage


then we noticed that the 'bad' run on this commit generally stop abruptly like
below (detail dmesg attached as dmesg.xz):

[   43.150719][   T41] rcu-scale:    1 writer-duration:    51 14438086
[   43.150723][   T41] rcu-scale:    1 writer-duration:    52 13912616
[   43.150728][   T41] rcu-scale:    1 writer-duration:    53 8321817
[   43.150732][   T41] rcu-scale:    1 writer-duration:    54 13430914
[   43.150737][   T41] rcu-scale:    1 writer-duration:    55 5860957
BUG: kernel reboot-without-warning in test stage


and for those 'good' runs on this commit, generally end up like:
(detail dmesg attached as dmesg-good.xz)

[   26.204793][   T41] rcu-scale:    1 writer-duration:    99 10163595
[   26.205348][   T41] rcu-scale:    1 writer-duration:   100 20268875
[   26.228712][   T41] rcu-scale:    1 writer-duration:   101 18695075
[   26.229309][   T41] rcu-scale:    1 writer-duration:   102 13985570
[   26.229873][   T41] rcu-scale:    1 writer-duration:   103 6422709
[   26.242702][   T41] ACPI: PM: Preparing to enter system sleep state S5
[   26.248010][   T41] reboot: Power down


and for parent, generally ends up like:
(detail dmesg attached as dmesg-parent.xz)

[   31.312023][   T41] rcu-scale:    1 writer-duration:    99 13060706
[   31.312952][   T41] rcu-scale:    1 writer-duration:   100 9798062
[   31.363511][   T41] rcu-scale:    1 writer-duration:   101 12240715
[   31.364526][   T41] rcu-scale:    1 writer-duration:   102 16554300
[   31.365456][   T41] rcu-scale:    1 writer-duration:   103 18276029
[   32.468788][  T340] _warn_unseeded_randomness: 32 callbacks suppressed
[   32.468795][  T340] random: get_random_u32 called from arch_pick_mmap_layout+0x7b/0x190 with crng_init=1
[   32.469575][  T340] random: get_random_u32 called from randomize_stack_top+0x27/0x50 with crng_init=1
[   32.469582][  T340] random: get_random_u32 called from arch_align_stack+0x29/0x40 with crng_init=1
[   33.164431][   T41] ACPI: PM: Preparing to enter system sleep state S5
[   33.173518][   T41] reboot: Power down



To reproduce:

        # build kernel
	cd linux
	cp config-5.18.0-rc1-00005-g5bffe4c611f5 .config
	make HOSTCC=clang-15 CC=clang-15 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=clang-15 CC=clang-15 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

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.



-- 
0-DAY CI Kernel Test Service
https://01.org/lkp



View attachment "config-5.18.0-rc1-00005-g5bffe4c611f5" of type "text/plain" (151318 bytes)

View attachment "job-script" of type "text/plain" (4721 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (14788 bytes)

Download attachment "dmesg-good.xz" of type "application/x-xz" (15272 bytes)

Download attachment "dmesg-parent.xz" of type "application/x-xz" (16380 bytes)