Kernel Panic when run with "modprobe hvcs"

[hgunasin]

Hi Team

I have 4.18.0-372.19.1.el8_6.ppc64le installed on ppc64le VM. When I run mkvterm to open a console to any VM witihn the system, it crashes Novalink VM immediately followed with a reboot.

The command which crashed the VM is narrowed down to following command: /sbin/modprobe -r hvcs

The modules seems to be loaded properly:

lsmod | grep hvcs

hvcs 22201 0 hvcserver 5193 1 hvcs

The module information:

modinfo hvcs

filename: /lib/modules/4.18.0-372.19.1.el8_6.ppc64le/kernel/drivers/tty/hvc/hvcs.ko.xz version: 1.3.3 license: GPL description: IBM hvcs (Hypervisor Virtual Console Server) Driver author: Ryan S. Arnold rsa@us.ibm.com rhelversion: 8.6 srcversion: 514B9ADD5C9153FBFA29E80 alias: vio:Tserial-serverShvterm2* depends: hvcserver intree: Y name: hvcs vermagic: 4.18.0-372.19.1.el8_6.ppc64le SMP mod_unload modversions mprofile-kernel relocatable sig_id: PKCS#7 signer: Red Hat Enterprise Linux kernel signing key sig_key: 08:A1:0F:64:C1:9C:27:F9:37:27:39:C7:16:5F:14:91:35:AB:BB:A3 sig_hashalgo: sha256 signature: SIG_Removed parm: hvcs_parm_num_devs:int

modinfo hvcserver

filename: /lib/modules/4.18.0-372.19.1.el8_6.ppc64le/kernel/arch/powerpc/platforms/pseries/hvcserver.ko.xz version: 1.0.0 license: GPL description: IBM hvcs ppc64 API author: Ryan S. Arnold rsa@us.ibm.com rhelversion: 8.6 srcversion: F64FAFE9C5A70848A72621E depends: intree: Y name: hvcserver vermagic: 4.18.0-372.19.1.el8_6.ppc64le SMP mod_unload modversions mprofile-kernel relocatable sig_id: PKCS#7 signer: Red Hat Enterprise Linux kernel signing key sig_key: 08:A1:0F:64:C1:9C:27:F9:37:27:39:C7:16:5F:14:91:35:AB:BB:A3 sig_hashalgo: sha256 signature: SIG_Removed

Installed powerpc-utils packages:

rpm -qa|grep powerpc

powerpc-utils-core-1.3.9-1.el8.ppc64le powerpc-utils-1.3.9-1.el8.ppc64le

Your advice on this issue is greatly appreciated. Thanks.

[nathanlynch]

Hi, this isn't a support forum for kernel issues, and there is no "mkvterm" command in powerpc-utils.