Re: Kernel builds, but crashes at boot (amd64, Revision: 234306)

On Mon, Apr 16, 2012 at 07:35:23AM -0700, matt wrote:
> On 04/16/12 01:57, O. Hartmann wrote:
> > On 04/15/12 12:30, Conrad J. Sabatier wrote:
> >> Today I'm suddenly unable to boot a newly built kernel without crashing
> >> right near the end of the device probes, just before the system is
> >> about to actually come up:
> >>
> >> Fatal trap 18: integer divide fault while in kernel mode
> >>
> >> Stopped at 0xffffffff803b2646 = g_label_ufs_taste_common+0x36
> >> divl 0x50(%rcx),%eax
> >>
> >> Backtrace lists this chain of calls:
> >> g_label_ufs_taste_common
> >> g_label_taste
> >> g_new_provider_event
> >> g_run_events
> >> g_event_procbody
> >> fork_exit
> >> fork_trampoline
> >>
> >> Whether built with clang or gcc, CUSTOM config or GENERIC, same results
> >> on rebooting.  No idea why this suddenly started happening, haven't
> >> changed anything at all in my setup.
> > My recent kernel does the same on two "FreeBSD 10.0-CURRENT #1 r234309:
> > Sun Apr 15 14:14:11 CEST 2012" boxes. Both boxes in common is they are
> > attached to a Dell UltraSharp U2711 screen which does have a built-in
> > USB/MMC hub. I realized that it was possible to log into my lab's box
> > from remote when I'm not in the lab and that is usually coincidentally
> > with a switched off screen.
> > This morning I loged in from home, loged out and got to the office,
> > switched on the screen - and reboot! I wasn't able to get the system
> > running again, it always got stuck in a
> >
> > Fatal trap 18: integer divide fault while in kernel mode
> >
> > Unplugging the screen's USB hub makes the system booting again!
> >
> > Following is one of the last logged messages from the kernel, I don not
> > know whether this is usefull looking for the problem.
> >
> > Regards,
> > Oliver
> >
> > Apr 12 15:32:33 telesto kernel: hwpmc:
> > SOFT/16/64/0x67<INT,USR,SYS,REA,WRI> TSC/1/64/0x20<REA>
> > IAP/4/48/0x3ff<INT,USR,SYS,EDG,THR,REA,WRI,INV,QUA,PRC>
> > IAF/3/48/0x61<INT,REA,WRI> UCP/8/48/0x3f8<EDG,THR,REA,WRI,INV,QUA,PRC>
> > UCF/1/48/0x60<REA,WRI>
> > Apr 12 15:32:33 telesto kernel: uhub1: 4 ports with 4 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: uhub2: 4 ports with 4 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: uhub3: 2 ports with 2 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: uhub0: 2 ports with 2 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: ugen3.2: <vendor 0x8087> at usbus3
> > Apr 12 15:32:33 telesto kernel: uhub4: <vendor 0x8087 product 0x0024,
> > class 9/0, rev 2.00/0.00, addr 2> on usbus3
> > Apr 12 15:32:33 telesto kernel: ugen0.2: <vendor 0x8087> at usbus0
> > Apr 12 15:32:33 telesto kernel: uhub5: <vendor 0x8087 product 0x0024,
> > class 9/0, rev 2.00/0.00, addr 2> on usbus0
> > Apr 12 15:32:33 telesto kernel: Root mount waiting for: usbus3 usbus0
> > Apr 12 15:32:33 telesto kernel: uhub5: 6 ports with 6 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: uhub4: 8 ports with 8 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: ugen3.3: <Cherry GmbH> at usbus3
> > Apr 12 15:32:33 telesto kernel: ukbd0: <Cherry GmbH wired keyboard,
> > class 0/0, rev 2.00/1.11, addr 3> on usbus3
> > Apr 12 15:32:33 telesto kernel: kbd2 at ukbd0
> > Apr 12 15:32:33 telesto kernel: uhid0: <Cherry GmbH wired keyboard,
> > class 0/0, rev 2.00/1.11, addr 3> on usbus3
> > Apr 12 15:32:33 telesto kernel: Root mount waiting for: usbus3
> > Apr 12 15:32:33 telesto kernel: ugen3.4: <vendor 0x0424> at usbus3
> > Apr 12 15:32:33 telesto kernel: uhub6: <vendor 0x0424 product 0x2514,
> > class 9/0, rev 2.00/0.00, addr 4> on usbus3
> > Apr 12 15:32:33 telesto kernel: Root mount waiting for: usbus3
> > Apr 12 15:32:33 telesto kernel: uhub6: 3 ports with 2 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: ugen3.5: <vendor 0x0424> at usbus3
> > Apr 12 15:32:33 telesto kernel: uhub7: <vendor 0x0424 product 0x2640,
> > class 9/0, rev 2.00/0.00, addr 5> on usbus3
> > Apr 12 15:32:33 telesto kernel: Root mount waiting for: usbus3
> > Apr 12 15:32:33 telesto kernel: uhub7: 3 ports with 2 removable, self
> > powered
> > Apr 12 15:32:33 telesto kernel: Root mount waiting for: usbus3
> > Apr 12 15:32:33 telesto kernel: ugen3.6: <Generic> at usbus3
> > Apr 12 15:32:33 telesto kernel: umass0: <Generic Ultra Fast Media
> > Reader, class 0/0, rev 2.00/1.91, addr 6> on usbus3
> > Apr 12 15:32:33 telesto kernel: Root mount waiting for: usbus3
> > Apr 12 15:32:33 telesto kernel: (probe0:umass-sim0:0:0:0): TEST UNIT
> > READY. CDB: 0 0 0 0 0 0
> > Apr 12 15:32:33 telesto kernel: (probe0:umass-sim0:0:0:0): CAM status:
> > SCSI Status Error
> > Apr 12 15:32:33 telesto kernel: (probe0:umass-sim0:0:0:0): SCSI status:
> > Check Condition
> > Apr 12 15:32:33 telesto kernel: (probe0:umass-sim0:0:0:0): SCSI sense:
> > NOT READY asc:3a,0 (Medium not present)
> > Apr 12 15:32:33 telesto kernel: da0 at umass-sim0 bus 0 scbus14 target 0
> > lun 0
> > Apr 12 15:32:33 telesto kernel: da0: <Generic Ultra HS-SD/MMC 1.91>
> > Removable Direct Access SCSI-0 device
> > Apr 12 15:32:33 telesto kernel: da0: 40.000MB/s transfers
> > Apr 12 15:32:33 telesto kernel: da0: Attempt to query device size
> > failed: NOT READY, Medium not present
> > Apr 12 15:32:33 telesto kernel: ugen3.7: <Logitech> at usbus3
> > Apr 12 15:32:33 telesto kernel: ums0: <Logitech USB Laser Mouse, class
> > 0/0, rev 2.00/56.01, addr 7> on usbus3
> > Apr 12 15:32:33 telesto kernel: ums0: 8 buttons and [XYZT] coordinates ID=0
> > Apr 12 15:32:33 telesto kernel: Trying to mount root from
> > ufs:/dev/gpt/root [rw]...
> > Apr 12 15:32:33 telesto kernel: nvidia0: <GeForce GTX 570> on vgapci0
> > Apr 12 15:32:33 telesto kernel: vgapci0: child nvidia0 requested
> > pci_enable_io
> > Apr 12 15:32:33 telesto kernel: vgapci0: child nvidia0 requested
> > pci_enable_io
> > Apr 12 15:32:33 telesto kernel: vboxdrv: fAsync=0 offMin=0x2d8 offMax=0x603c
> > Apr 12 15:32:33 telesto kernel: module_register: module ng_ether already
> > exists!
> > Apr 12 15:32:33 telesto kernel: Module ng_ether failed to register: 17
> >
> Disconnect "Generic Ultra HS-SD/MMC" device which is presenting
> da0...same problem here. System will boot if da0 is either not present
> or has media (I think). In my case it was a different card reader that
> had no cards in it, which seem to be similar to your case.
> 
> My guess is that this problem is related to recent changes in da, but I
> couldn't pinpoint in the diff what's going wrong in a quick look.

So did you tried to revert r234177 and/or r233963 ?