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X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: cAOFdCith7gdfY6BeHlon2v87Fvmo7qHmGXw+HprAQYzdZYxlcYZf3w/lxUgiSYBKjVHH5ueBf9jhZt8bEmkCQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR11MB7428 X-OriginatorOrg: intel.com Hello, patch "serial: 8250: Switch to nbcon console" was reverted by f79b163c42314 Revert "serial: 8250: Switch to nbcon console" based on our previous old report "[linux-next:master] [serial] b63e6f60ea: BUG:soft_lockup-CPU##stuck_for#s![modprobe:#]" in https://lore.kernel.org/all/202501221029.fb0d574d-lkp@intel.com/ there are some discussions which seems think the commit is not the real root cause of the issue. this commit 55eabced1d reapplies "serial: 8250: Switch to nbcon console", then we notice a new "kernel_reboot-without-warning_in_test_stage" issue in a boot test with randconfig. however, unfortunately, we cannot capture further useful information in dmesg. so maybe this report cannot supply enough useful information, just FYI what we observed in our tests. below is full report. kernel test robot noticed "BUG:kernel_reboot-without-warning_in_test_stage" on: commit: 55eabced1d566d2815cc215272ece998c8f2e93f ("Reapply "serial: 8250: Switch to nbcon console"") https://git.kernel.org/cgit/linux/kernel/git/rt/linux-rt-devel.git linux-7.0.y-rt-rebase in testcase: boot config: x86_64-randconfig-001-20260225 compiler: gcc-13 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G (please refer to attached dmesg/kmsg for entire log/backtrace) +-------------------------------------------------+----------+------------+ | | v7.0-rc1 | 55eabced1d | +-------------------------------------------------+----------+------------+ | boot_successes | 40 | 0 | | boot_failures | 0 | 6 | | BUG:kernel_reboot-without-warning_in_test_stage | 0 | 6 | +-------------------------------------------------+----------+------------+ 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 | Closes: https://lore.kernel.org/oe-lkp/202602271552.c972ef9e-lkp@intel.com [ 16.023891][ T126] sleep started [ 16.023940][ T126] [ 17.102254][ T126] /usr/bin/wget -q --timeout=3600 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/jobs/scheduled/vm-meta-288/boot-1-quantal-x86_64-core-20190426.cgz-x86_64-randconfig-001-20260225-55eabced1d56-20260226-27605-1wm64jc-2.yaml&job_state=post_run -O /dev/null [ 17.106752][ T126] mkdir: cannot create directory `/var/lock/lkp-bootstrap.lock': File exists [ 19.145988][ T126] kill 428 vmstat -n 1 [ 19.146032][ T126] [ 19.189830][ T126] kill 419 cat /proc/kmsg [ 19.189873][ T126] [ 19.253688][ T126] kill 447 /bin/sh /lkp/lkp/src/programs/watchdog/monitor [ 19.258684][ T126] [ 19.277825][ T126] wait for background processes: 439 [ 19.277867][ T126] [ 19.279442][ T126] monitor [ 19.279463][ T126] [ 24.067178][ T126] /usr/bin/wget -q --timeout=3600 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/jobs/scheduled/vm-meta-288/boot-1-quantal-x86_64-core-20190426.cgz-x86_64-randconfig-001-20260225-55eabced1d56-20260226-27605-1wm64jc-2.yaml&loadavg=0.94%200.22%200.07%201/102%20625&start_time=1772044359&end_time=1772044361&version=/lkp/lkp/.src-20260226-000921:3d999d51ba0e-dirty:bc8736f22ca0& -O /dev/null [ 24.067231][ T126] [ 25.032907][ T126] /usr/bin/wget -q --timeout=3600 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-jobfile-append-var?job_file=/lkp/jobs/scheduled/vm-meta-288/boot-1-quantal-x86_64-core-20190426.cgz-x86_64-randconfig-001-20260225-55eabced1d56-20260226-27605-1wm64jc-2.yaml&job_state=finished -O /dev/null [ 25.035121][ T126] [ 25.272417][ T1] init: tty4 main process (515) terminated with status 1 [ 25.273235][ T1] init: tty4 main process ended, respawning [ 25.304364][ T1] init: tty5 main process (518) terminated with status 1 [ 25.305147][ T1] init: tty5 main process ended, respawning [ 25.320550][ T1] init: tty2 main process (519) terminated with status 1 [ 25.321322][ T1] init: tty2 main process ended, respawning [ 25.340485][ T1] init: tty3 main process (522) terminated with status 1 [ 25.341245][ T1] init: tty3 main process ended, respawning [ 25.368534][ T1] init: tty6 main process (523) terminated with status 1 [ 25.369377][ T1] init: tty6 main process ended, respawning LKP: ttyS0: 103: LKP: tbox cant kexec and rebooting forcely [ 26.117689][ T126] LKP: stdout: 103: LKP: tbox cant kexec and rebooting forcely [ 26.117719][ T126] [ 26.234198][ T126] /usr/bin/wget -q --timeout=3600 --tries=1 --local-encoding=UTF-8 http://internal-lkp-server:80/~lkp/cgi-bin/lkp-wtmp?tbox_name=vm-snb&tbox_state=rebooting_cant_kexec&job_file=/lkp/jobs/scheduled/vm-meta-288/boot-1-quantal-x86_64-core-20190426.cgz-x86_64-randconfig-001-20260225-55eabced1d56-20260226-27605-1wm64jc-2.yaml -O /dev/null [ 26.238678][ T126] BUG: kernel reboot-without-warning in test stage The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260227/202602271552.c972ef9e-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki