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
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