Hello all, when I updated my Kernel from version 5.4.155 to 5.4.215 I get an strange xhci error: /xhci-hcd f10f0000.usb3: ERROR unknown event type 37// //xhci-hcd f10f0000.usb3: ERROR Transfer event TRB DMA ptr not part of current TD ep_index 2 comp_code 13// / After a lot of this messages, my hardware makes a reboot without any more outputs. The error only occures when i add /console=null/ to my kernel bootargs. When I add instead console=/ttyS0,115200/ no error occured. Now I go back in kernelversions. The error occured first in version 5.4.159. Between patchlevel 158 and 159 there is a change: /--- linux-5.4.158/kernel/printk/printk.c 2021-11-06 13:59:45.000000000 +0100// //+++ linux-5.4.159/kernel/printk/printk.c 2021-11-12 14:43:05.000000000 +0100// //@@ -2193,8 +2193,15 @@// // char *s, *options, *brl_options = NULL;// // int idx;// //// //- if (str[0] == 0)// //+ /*// //+ * console="" or console=null have been suggested as a way to// //+ * disable console output. Use ttynull that has been created// //+ * for exacly this purpose.// //+ */// //+ if (str[0] == 0 || strcmp(str, "null") == 0) {// //+ __add_preferred_console("ttynull", 0, NULL, NULL);// // return 1;// //+ }// //// // if (_braille_console_setup(&str, &brl_options))// // return 1;/ I checked my kernelconfig and found that I have no ttynull device configured (/CONFIG_NULL_TTY=n/). Add /CONFIG_NULL_TTY=y/ to my kernelconfig doesn't made a change. When I undo the change above, everything works fine. Does anybody know, what could be the main trigger for the error above? Regards, Sarah -- Unsere Aussagen koennen Irrtuemer und Missverstaendnisse enthalten. Bitte pruefen Sie die Aussagen fuer Ihren Fall, bevor Sie Entscheidungen auf Grundlage dieser Aussagen treffen. Wiesemann & Theis GmbH, Porschestr. 12, D-42279 Wuppertal Geschaeftsfuehrer: Dipl.-Ing. Ruediger Theis Registergericht: Amtsgericht Wuppertal, HRB 6377 Infos zum Datenschutz: https://www.wut.de/datenschutz Tel. +49-202/2680-0, Fax +49-202/2680-265, https://www.wut.de