[parisc-linux] exec() problem
Sat, 6 Nov 1999 20:27:38 +0100
> This is rumored to be a known problem. Since I've seen it a lot recently
I am not sure it's the one I do know (and which will be fixed as soon as I got
my machines set-up again and got time to do debugging).
> and am going on vacation, here's what I know in case it helps. The problem
> can manifest on one machine and not another with the same bits. It can
> come and go as the size of code in arch/parisc/kernel changes. The
> problem shows in the boot like this:
> Attempting to execute '/sbin/init'
> PSW : 0004000b GR 1 : c0128800 GR 2 : c0029390 GR 3 : 00000000
> GR 4 : 00000000 GR 5 : ffffffff GR 6 : 00000000 GR 7 : c0092708
> GR 8 : c0fdba20 GR 9 : c00924c8 GR10 : 00000080 GR11 : 0000000a
> GR12 : 00000000 GR13 : 00000000 GR14 : 00000001 GR15 : c00927c8
> GR16 : c0100000 GR17 : c00292e0 GR18 : c0092720 GR19 : 00000000
> GR20 : c0128a00 GR21 : a0000024 GR22 : 00000000 GR23 : c012bc7c
> GR24 : c00927c8 GR25 : 00000000 GR26 : c0092708 GR27 : c008e000
> GR28 : 00000000 GR29 : 00000000 GR30 : c0092a00 GR31 : c0039914
> SR0 : 00000000 SR1 : 00000000 SR2 : 00000000 SR3 : 00000000
> SR4 : 00000000 SR5 : 00000000 SR6 : 00000000 SR7 : 00000000
> IAOQ : c0028e5c c0028e60
> bad address a000002c (code 15)
> Kernel panic: bad address
> adb on the IAOQ address says:
> do_generic_file_read+16C: LDW 8(r21),r19
> which is consistent with the value in r21 (a0000024). This is
> inside a call which I believe is called eventually from do_execve()
> called within init/main.c:init(). I didn't track down do_execve().
This looks a lot like a completely bogus pointer which might be both memory
corruption and the schedule() returns early bug I know of.