Re: nouveau reboot

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On Fri, Jul 21, 2017 at 08:17:44AM +0100, Patrick Welche wrote:
> On Fri, Jul 21, 2017 at 07:53:09AM +0100, Patrick Welche wrote:
> > On Thu, Jul 20, 2017 at 09:06:16PM +0000, coypu%sdf.org@localhost wrote:
> > > On Thu, Jul 13, 2017 at 09:49:32AM +0100, Patrick Welche wrote:
> > > > or "new" reboot: just updated a working 3rd July amd64
> > > > kernel with this morning's source, and the computer reboots after
> > > > printing nouveau, but before drm. Haven't had a chance to dig (won't
> > > > until tonight) - any first guesses?
> > > 
> > > Must be unrelated to nouveau. no changes in sys/external/bsd/drm2 since
> > > June 1.
> > 
> > In the meantime it is getting even more confusing: I bisected to
> > 
> > http://mail-index.netbsd.org/source-changes/2017/07/11/msg086253.html
> > 
> >     lm(4): Add suport for NCT5174D, NCT6775F, NCT6779D and NCT679[1235]D.
> >     wbsio(4): Add support for NCT6795D.
> > 
> > but then rebooting with disable wbsio (which didn't switch anything off)
> > and disable lm still failed. Now moving the modules which I haven't kept
> > in synch during the bisection away.
> 
> Moving the modules out of the way now gets consistent results:
> - unsuccessful boot with the above patch
> - successful boot with the above patch and "disable lm"
> 
> I have no idea what chip is in this box(!)

Serial console to the rescue:

Kernel lock error: _kernel_lock,216: spinout

lock address : 0xffffffff8108bdc0 type     :               spin
initialized  : 0xffffffff80a9daf1
shared holds :                  0 exclusive:                  1
shares wanted:                  0 exclusive:                 16
current cpu  :                 14 last held:                  7
current lwp  : 0xffffe4013af4b5e0 last held: 0xffffe4013af19180
last locked* : 0xffffffff8074c92b unlocked : 0xffffffff80243a3c
curcpu holds :                  0 wanted by: 0xffffe4013af4b5e0
uhub5: 4 ports with 4 removable, self powered

acpicpu15: ACPI CPUs started
panic: LOCKDEBUG: Kernel lock error: _kernel_lock,216: spinout

last held by:
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
0      124 2   7       200   ffffe4013af19180         configintr
bus_space_read_1() at netbsd:bus_space_read_1+0xf
putchar() at netbsd:putchar+0x128
kprintf() at netbsd:kprintf+0xc01
aprint_error_internal() at netbsd:aprint_error_internal+0x77
aprint_error() at netbsd:aprint_error+0x41
ahci_do_reset_drive() at netbsd:ahci_do_reset_drive+0x428
ahci_probe_drive() at netbsd:ahci_probe_drive+0x1ae
atabusconfig() at netbsd:atabusconfig+0x1c0
atabus_thread() at netbsd:atabus_thread+0x7a

wanted by:
PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
0    > 129 7  14       200   ffffe4013af4b5e0         configintr
breakpoint() at netbsd:breakpoint+0x5
vpanic() at netbsd:vpanic+0x16f
snprintf() at netbsd:snprintf
lockdebug_more() at netbsd:lockdebug_more
_kernel_lock() at netbsd:_kernel_lock+0x1cb

db{14}> show proc /a 0xffffe4013af4b5e0
lwp_t ffffe4013af4b5e0
system: pid 0 proc ffffffff810511e0 vmspace/map ffffffff81107b80 flags 20002
> lwp 129 [configintr] ffffe4013af4b5e0 pcb ffffe4013af45000
    stat 7 flags 200 cpu 14 pri 96
> lwp 128 [configintr] ffffe4013af4ba00 pcb ffffe4013af41000
    stat 7 flags 200 cpu 1 pri 96
> lwp 127 [configintr] ffffe4013af0a1a0 pcb ffffe4013af3a000
    stat 7 flags 200 cpu 12 pri 96
...

no sign of lm nor wbsio, just plenty of ahci / sata_reset_interface - there
are 7 sata devices.

Cheers,

Patrick