linux-kernel - Fwd: [printk] e695fbe780: BUG:scheduling_while

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Date:   Fri, 23 Sep 2022 21:15:18 +0700
From:   Ammar Faizi <ammarfaizi2@...weeb.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     kernel test robot <oliver.sang@...el.com>,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        RCU Mailing List <rcu@...r.kernel.org>, lkp@...ts.01.org,
        lkp@...el.com
Subject: Fwd: [printk] e695fbe780: BUG:scheduling_while_atomic



-------- Forwarded Message --------
Subject: [printk]  e695fbe780: BUG:scheduling_while_atomic
Date: Fri, 23 Sep 2022 16:02:58 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Ammar Faizi <ammarfaizi2@...weeb.org>, GNU/Weeb Mailing List <gwml@...r.gnuweeb.org>
CC: lkp@...ts.01.org, lkp@...el.com



Greeting,

FYI, we noticed the following commit (built with gcc-11):

commit: e695fbe780f429298dca1fd826601968b5d00200 ("printk: Prepare for SCRU console list protection")
https://github.com/ammarfaizi2/linux-block paulmck/linux-rcu/printk.2022.09.11a

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):


+-----------------------------+------------+------------+
|                             | c522626383 | e695fbe780 |
+-----------------------------+------------+------------+
| boot_successes              | 12         | 0          |
| boot_failures               | 0          | 16         |
| BUG:scheduling_while_atomic | 0          | 16         |
+-----------------------------+------------+------------+


If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Link: https://lore.kernel.org/r/202209231537.b9d509b-oliver.sang@intel.com


[    0.326642][    T0] printk: console [tty0] enabled
[    0.327777][    T0] printk: console [ttyS0] enabled
[    0.329795][    T0] printk: bootconsole [earlyser0] disabled
[    0.332327][    T0] BUG: scheduling while atomic: swapper/0/0x00000002
[    0.333877][    T0] Modules linked in:
[    0.335157][    T0] CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc1-00138-ge695fbe780f4 #1
[    0.337196][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-4 04/01/2014
[    0.343745][    T0] Call Trace:
[    0.344608][    T0]  ? show_stack+0x33/0x39
[    0.345628][    T0]  dump_stack_lvl+0x20/0x2a
[    0.346859][    T0]  dump_stack+0xd/0x10
[    0.347869][    T0]  __schedule_bug.cold+0x56/0x66
[    0.349104][    T0]  __schedule+0x3df/0x4d0
[    0.350260][    T0]  ? prb_read+0x78/0x1c0
[    0.351334][    T0]  schedule+0x52/0xd0
[    0.352362][    T0]  schedule_timeout+0x8d/0xd0
[    0.353504][    T0]  ? __might_sleep+0x2f/0x90
[    0.354723][    T0]  __wait_for_common+0x8b/0x190
[    0.355826][    T0]  ? usleep_range_state+0xc0/0xc0
[    0.357005][    T0]  wait_for_completion+0x1c/0x20
[    0.358239][    T0]  synchronize_srcu+0x5e/0x80
[    0.359453][    T0]  ? get_completed_synchronize_rcu+0x10/0x10
[    0.360879][    T0]  console_unregister_locked+0x8b/0xa5
[    0.362247][    T0]  register_console.cold+0x5f/0x6c
[    0.363569][    T0]  univ8250_console_init+0x1b/0x25
[    0.364813][    T0]  console_init+0x1f/0x24
[    0.365865][    T0]  start_kernel+0x2b9/0x3bb
[    0.367072][    T0]  i386_start_kernel+0x42/0x44
[    0.385824][    T0]  startup_32_smp+0x161/0x164



To reproduce:

         # build kernel
	cd linux
	cp config-6.0.0-rc1-00138-ge695fbe780f4 .config
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-11 CC=gcc-11 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-6.0.0-rc1-00138-ge695fbe780f4" of type "text/plain" (70728 bytes)

View attachment "job-script" of type "text/plain" (4629 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (163280 bytes)