On Thu, 2014-11-13 at 18:40 -0800, Nikolaus Rath wrote: > > On November 13, 2014 5:03:56 PM PST, Ben Hutchings <ben@decadent.org.uk> wrote: > >> On 11/13/2014 01:45 PM, Ben Hutchings wrote: > >> > On Thu, 2014-11-13 at 12:53 -0800, Nikolaus Rath wrote: > >> >> Package: src:linux > >> >> Version: 3.16.7-2 > >> >> Severity: normal > >> >> File: /boot/vmlinuz-3.16.0-4-amd64 > >> >> > >> >> Hello, > >> >> > >> >> When adding > >> >> > >> >> console=ttyS0,115200n8 console=tty0 no_console_suspend > >> >> > >> >> to the kernel command line, I'm getting the following kernel Oops > >during > >> >> boot (full quote in kernel.log below): > >> >> > >> >> [...] > >> >> [ 13.687971] 0000:07:01.0: ttyS0 at I/O 0xc050 (irq = 19, > >base_baud = 115200) is a 16550A > >> >> [ 13.687980] kernel tried to execute NX-protected page - exploit > >attempt? (uid: 0) > >> >> [ 13.688130] BUG: unable to handle kernel paging request at > >ffffffff819419bf > >> >> [ 13.688299] IP: [<ffffffff819419bf>] > >serial8250_console_setup+0x0/0xaa > >> >> [ 13.688604] PGD 1816067 PUD 1817063 PMD 215f93063 PTE > >8000000001941163 > >> >> [ 13.688911] Oops: 0011 [#1] SMP > >> >> [...] > >> >> > >> >> Please let me know if I can do something to debug this further. > >> > [...] > >> > > >> > The log didn't include the full oops message; please can you send > >that > >> > as I don't understand why anything would call this function at this > >> > point. (It is only meant to be called during kernel > >initialisation, > >> > before starting the init program. At this point the code has been > >> > freed, hence the page fault.) > >> > >> Full log is attached. Sorry, I did not realize that the automatically > >> included log was truncated. > > > >This bug seems to be specific to parport_serial. Only built-in drivers > >can be console drivers, but parport_serial is built as a module. > >However, because it works on top of with 8250_pci, which *is* built-in, > >the kernel tries to use it as a console driver anyway, and this leads > >to > >the crash. We should fix the crash, but you still won't be able to use > >ports on the combined parallel/serial card for a console. > > Duh. Not at all, or will it work if I build my own kernel with parport_serial built-in? I think this would work if parport_serial is built-in. > Do I understand correctly that a pci card with only serial ports would work without changes? Yes, if it's present at boot. Ben. -- Ben Hutchings Any smoothly functioning technology is indistinguishable from a rigged demo.
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