intermittent kernel panic problem on boot

intermittent kernel panic problem on boot

Post by Jim Yona » Sat, 08 Aug 1998 04:00:00



About 5% of the time I reboot my linux system, I get:

    kernel panic: VFS: unable to mount root fs on 8:15

I am running RH5.1 on a Pentium Pro 200 with an Adaptec AHA-294x SCSI
adaptor.

Has anyone else seen this?

Jim Yonan

 
 
 

intermittent kernel panic problem on boot

Post by Ignac » Sat, 08 Aug 1998 04:00:00




 >About 5% of the time I reboot my linux system, I get:
 >
 >    kernel panic: VFS: unable to mount root fs on 8:15
 >
 >I am running RH5.1 on a Pentium Pro 200 with an Adaptec AHA-294x
SCSI
 >adaptor.
 >
 >Has anyone else seen this?
 >
 >Jim Yonan

You probably have bad termination on your SCSI chain. Run, don't walk,
to the nearest computer store at your earliest convenience and pick up
one or two active terminators and slap 'em on your SCSI bus. Make sure
you disable termination on all of your other SCSI devices.



 
 
 

intermittent kernel panic problem on boot

Post by Eugene Blanchar » Mon, 10 Aug 1998 04:00:00



> About 5% of the time I reboot my linux system, I get:

>     kernel panic: VFS: unable to mount root fs on 8:15

> I am running RH5.1 on a Pentium Pro 200 with an Adaptec AHA-294x SCSI
> adaptor.

> Has anyone else seen this?

> Jim Yonan

Could also be a bad scsi cable/connector besides the terminations.
Sometimes the terminations are sip resistors onboard the scsi card. Try
reseating them (push them back in their sockets). Maybe they're loose.
 
 
 

1. intermittent kernel panics

This is one of those 'crashing with no discernable pattern' type
postings. I think what I'm really asking is where to start looking for
clues.

I've just reinstalled. System is Mac 7200, standard platinum video,
separate 4gb SCSI disk for LinuxPPC (R5) with 2 partitions + swap. I had
a previous installation (slightly different partitions) installed with
the X installer, working fine. The only hardware change has been adding
a PCI USB card and a Logitech USB mouse, but the system has recognised
them correctly and I've seen no USB-related errors.

The re-install has been a bit of a nightmare - X installer wouldn't
install anything (though it reported it did - a common problem I
think?). RedHat installer 'worked' after several attempts, but now, on
about half the bootups, it gets to 'starting X server' and dies with a
kernel panic:

Sep 29 11:27:06 localhost rc: Starting sound succeeded
Sep 29 11:27:06 localhost kernel: NIP: C004B0B4 XER: 00000000 LR:
C004B080 REGS: c32fbcf0 TRAP: 0300
Sep 29 11:27:06 localhost kernel: MSR: 00009030 EE: 1 PR: 0 FP: 0 ME: 1
IR/DR: 11
Sep 29 11:27:06 localhost kernel: TASK = c32fa000[375] 'rm' mm->pgd
c3072000 Last syscall: 40  
Sep 29 11:27:06 localhost kernel: last math c32fa000
Sep 29 11:27:06 localhost kernel: GPR00: C004B080 C32FBDE0 C32FA000
C3329CE0 000D83E2 00000400 00000000 00000000  
Sep 29 11:27:06 localhost kernel: GPR08: C01D7880 C2C99AA0 00000001
C039CA40 244424E4 0184D144 00000000 00000000  
Sep 29 11:27:06 localhost kernel: GPR16: 018D1E90 00000000 FFFFFFFF
00000000 00009032 032FBE80 00000000 C0003A80  
Sep 29 11:27:06 localhost kernel: GPR24: C0003838 C32FBDE8 C3FC1400
FFFFFFFE C3040240 FFFFFFFB C394AFC0 40000000  
Sep 29 11:27:06 localhost kernel: Call backtrace:  
Sep 29 11:27:06 localhost kernel: C004B080 C004B348 C00341C0 C00342E4
C000388C 0180255C 01802D9C  
Sep 29 11:27:06 localhost kernel: 018011AC 016DF7D4 00000000  
Sep 29 11:27:06 localhost kernel: Instruction DUMP: 38a561d0  48001391
480001d4 <83dd0024> 80fc0018  815e0000  a11e0004  5549421e  5540c00e  
Sep 29 11:27:06 localhost kernel: Kernel panic: kernel access of bad
area pc c004b0b4 lr c004b080 address 1F tsk rm/375

Using BootX 1.1.3., no kernel args, 'no video driver' checked.
I realise this may well not be the info needed to sort this out, but if
someone could tell me how to approach the problem, and what data IS
relevant I'd be EXTREMELY grateful. I'm losing my hair fast here :-\

Tim

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