Hello,
I've recently upgraded our PC164LX box with an IntraServer ITI4280 dual
channel wide SCSI controller which is now directly supported by DU 4.0E.
Additionally I've got a NCR810 based controller driving a narrow SCSI bus,
making a total 3 SCSI busses. The third SCSI bus is only used for
peripherals like CD-ROMs and DAT drives.
In the last week, I've experienced two hard crashes, both with the
same symptoms:
1.) There was heavy I/O going on on the 3rd SCSI bus.
2.) There were no errors logged except for the crash data dump.
3.) The kernel stack backtrace was always the same:
> 0 boot() ["../../../../src/kernel/arch/alpha/machdep.c":1931, 0xfffffc0000487c0c]
1 panic(0x0, 0x15, 0x8, 0x0, 0x0) ["../../../../src/kernel/bsd/subr_prf.c":755, 0xfffffc0000284d00]
2 psiop_hardintr(shp = 0xffffffffa1396000) ["../../../../src/kernel/io/cam/siop/psiop.c":2235, 0xfffffc0000529124]
3 psiop_intr(0xfffffc000052e7a0, 0x0, 0x1, 0xfffffc00002382c1, 0x2) ["../../../../src/kernel/io/cam/siop/pci/psiop_pci.c":1893, 0xfffffc000052e160]
4 psiopintr(0x1, 0xfffffc00002382c1, 0x2, 0xfffffc0000000002, 0xfffffc000054266c) ["../../../../src/kernel/io/cam/siop/pci/psiop_pci.c":2327,0xfffffc000052e79c]
[...]
4.) The crash data says:
Machine Check SYSTEM Fatal Abort
Machine Check Code = 213
Scatter/Gather PTE invalid error
followed by a pile of register dumps.
So I'm afraid that I got a rather unstable machine now. It *is* possible
that the third SCSI bus is a bit flakey, meaning: I saw some bus-resets as
well as parity errors before, but only about once or twice per week.
And: This has never caused a crash.
Is it possible that the SIOP driver code is not prepared to handle SCSI
busses higher than 1 (the SIOP bus is now #2!).
Can anyone who has the kernel sources look what it says at:
/src/kernel/io/cam/siop/psiop.c, line 2235
Any other ideas anyone ?
Thanks a lot // Tom
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Received on Wed Jun 09 1999 - 15:18:54 NZST