Greeting,

FYI, we noticed the following commit (built with gcc-7):

commit: f7ef8a5f8373d57d477205b74849e27b33fb1144 ("pstore/platform: Use backend name for console registration")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

in testcase: kernel-selftests
with following parameters:

	group: kselftests-02
	ucode: 0xd6

test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt


on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 16G memory

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 <rong.a.chen@intel.com>



# selftests: pstore: pstore_tests
# === Pstore unit tests (pstore_tests) ===
# UUID=204d2856-20b4-4158-9b0c-e1bc52dd3c43
# Checking pstore backend is registered ... ok
# 	backend=ramoops
# 	cmdline= ip=::::lkp-skl-d01::dhcp root=/dev/ram0 user=lkp job=/lkp/jobs/scheduled/lkp-skl-d01/kernel-selftests-kselftests-02-ucode=0xd6-debian-x86_64-20191114.cgz-f7ef8a5f8373d57d477205b74849e27b33fb1144-20200525-9704-81mb64-3.yaml ARCH=x86_64 kconfig=x86_64-rhel-7.6-kselftests branch=linux-devel/devel-hourly-2020051901 commit=f7ef8a5f8373d57d477205b74849e27b33fb1144 BOOT_IMAGE=/pkg/linux/x86_64-rhel-7.6-kselftests/gcc-7/f7ef8a5f8373d57d477205b74849e27b33fb1144/vmlinuz-5.7.0-rc1-00013-gf7ef8a5f8373d erst_disable max_uptime=3600 RESULT_ROOT=/result/kernel-selftests/kselftests-02-ucode=0xd6/lkp-skl-d01/debian-x86_64-20191114.cgz/x86_64-rhel-7.6-kselftests/gcc-7/f7ef8a5f8373d57d477205b74849e27b33fb1144/3 LKP_SERVER=inn nokaslr selinux=0 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 net.ifnames=0 printk.devkmsg=on panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 drbd.minor_count=8 systemd.log_level=err ignore_loglevel console=tty0 earlyprintk=ttyS0,115200 console=ttyS0,115200 vga=normal rw
# Checking pstore console is registered ... FAIL
# Checking /dev/pmsg0 exists ... ok
# Writing unique string to /dev/pmsg0 ... ok
not ok 1 selftests: pstore: pstore_tests # exit=1


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Rong Chen