Messages in this thread | | | Date | Thu, 11 Nov 1999 14:59:44 +0100 | From | Pavel Machek <> | Subject | Re: kiobuf using kernel pages |
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Hi!
> >> Trying to port the SGI lcrash code to 2.3.26 ix86. It compiles, runs, > >> traps the oops, starts writing the dump to swap, dies with -EFAULT in > >> sd_raw_rw. My guess is because the buffer address is c2c00000, i.e. I > > > >Firstly if your machine has crashed I wouldnt recommend invoking the scsi > >disk layer. If your partition info is corrupt or the scsi malloc pool is > >corrupt you could hit anything. > > Agreed. But SGI have gone to the bother of writing a free standing, > raw i/o SCSI system to "handle" dumps even when the machine has > crashed, using a pre formatted swap partition. I am not convinced > myself if it is safe or not, only experience will show. Their patch is > only against 2.2.13, I'm porting it to 2.3.26 for testing.
There could be semi-safe way to do this:
Pre-fill crash partition with "This is a crash partition" text. Then, on dump, first read what is written there (for each block) then write it. That should protect you in most scenarios.
Pavel -- The best software in life is free (not shareware)! Pavel GCM d? s-: !g p?:+ au- a--@ w+ v- C++@ UL+++ L++ N++ E++ W--- M- Y- R+
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