On Tue, Jan 23, 2018 at 5:52 PM, Alan Cox <gno...@lxorguk.ukuu.org.uk> wrote: > On Wed, 17 Jan 2018 09:24:32 -0800 > Shankara Pailoor <sp3...@columbia.edu> wrote: > >> Hi Greg, >> >> Sorry for that. Here is the stack trace. C Program below > > > >> serial_in drivers/tty/serial/8250/8250.h:111 [inline] >> wait_for_xmitr+0x8a/0x1d0 drivers/tty/serial/8250/8250_port.c:2033 >> serial8250_console_putchar+0x19/0x50 >> drivers/tty/serial/8250/8250_port.c:3170 >> uart_console_write+0x98/0xc0 drivers/tty/serial/serial_core.c:1858 > > The console is spinning in polled mode trying to write data to the > console port, which it seems has gotten a bit stuck. Could be the > hypervisor hits some kind of buffering limit, could be hypervisor > interface broke. > > Either way the console interface is supposed to stall the machine to > ensure the bytes always get out and if your serial port jams or gets > massively behind then this will happen.
+1 https://lkml.org/lkml/2017/12/21/480 -- With Best Regards, Andy Shevchenko
