panic: bad pte at line 2539 in file /usr/src/sys/amd64/amd64/pmap.c

[Gary Jennejohn]

Till Plewe writes:
> 
> Has anybody else encountered this panic? It occurs only when I have 2 or
> more processes of >=1GB running. I will build a debug kernel now and
> wait for the next panic. 
> 
> - Till
> 
> ###########################
> last messages before reboot
> ###########################
> 
> pid 867 (python2.4), uid 0: exited on signal 11
> pid 874 (python2.4), uid 0: exited on signal 11
> pid 876 (python2.4), uid 0: exited on signal 11
> pid 877 (python2.4), uid 0: exited on signal 11
> pid 891 (python2.4), uid 0: exited on signal 11
> pid 892 (python2.4), uid 0: exited on signal 11
> pid 893 (python2.4), uid 0: exited on signal 11
> pid 900 (python2.4), uid 0: exited on signal 11
> pid 1041 (python2.3), uid 0: exited on signal 11
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=157835242
> pid 1258 (python2.3), uid 0: exited on signal 11
> pid 1259 (python2.3), uid 0: exited on signal 11
> pid 1274 (python2.3), uid 0: exited on signal 11
> pid 1415 (python2.4), uid 0: exited on signal 10
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=157823458
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=157823458
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=80228994
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=80228834
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=80240642
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=157836086
> pid 10957 (python2.4), uid 0: exited on signal 11
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=80240642
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=157836086
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=157835286
> ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=157836086
> pid 14903 (python2.4), uid 0: exited on signal 6
> ad0: TIMEOUT - WRITE_DMA retrying (2 retries left) LBA=157823458
> pid 15489 (python2.4), uid 0: exited on signal 11
> pid 15872 (python2.4), uid 0: exited on signal 11
> pid 15865 (python2.4), uid 0: exited on signal 6
> TPTE at 0xffff800000a0ce60  IS ZERO @ VA 1419cc000
> panic: bad pte
> at line 2539 in file /usr/src/sys/amd64/amd64/pmap.c
> cpuid = 0;
> boot() called on cpu#0
> 

Looks to me like it's trying to access swap and failing due to the
ad0 errors. The panic is a result of this failure.

The atapi drivers are pretty flakey at the moment :-( I've been forced
to run my drive in PIO4 mode to avoid the DMA errors! Of course, your
disk might also be failing.

---
Gary Jennejohn / garyj[at]jennejohn.org gj[at]freebsd.org gj[at]denx.de