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

[O. Hartmann]

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

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