continuation of calcru: runtime went backwards and hang on 5.4-STABLE

[Robert Watson]

On Thu, 25 Aug 2005, Jason wrote:

> so my system was running for about 1.5 days now and now there is no sign 
> of the Aug 22 17:20:18 monsterjam kernel: calcru: runtime went backwards 
> from 17036511 usec to 16590577 usec for pid 71 (schedcpu) message..
>
> but it appears to have dumped into the debugger today for no apparent 
> reason.

The below looks like you ran a terminal application on the client end of 
the serial console that generated a break signal, then initialized the 
modem using an AT command string.  I.e., you might want to set your 
communication client to not generate a break signal and initialize the 
modem...  If that's not possible, try using ALT_BREAK_TO_DEBUGGER instead 
of BREAK_TO_DEBUGGER in order to avoid accidental breaking to the 
debugger.

Robert N M Watson

>
>
> here is a trace..
>
> db> AT S7=45 S0=0 L1 V1 X4 &c1 E1 Q0
> No such command
> db>
> db> trace
> Tracing pid 12 tid 100004 td 0xc2284600
> kdb_enter(c0807c53) at kdb_enter+0x2b
> siointr1(c2438800,c08ee3c0,0,c0807a1b,6ad) at siointr1+0xce
> siointr(c2438800) at siointr+0x21
> intr_execute_handlers(c2278c90,e3392cb4,4,e3392cf8,c07754a3) at intr_execute_handlers+0x9d
> lapic_handle_intr(34) at lapic_handle_intr+0x2e
> Xapic_isr1() at Xapic_isr1+0x33
> --- interrupt, eip = 0xc077c87d, esp = 0xe3392cf8, ebp = 0xe3392cf8 ---
> cpu_idle_default(e3392d0c,c05ed9c5,c2283a98,e3392d24,c05ed78c) at cpu_idle_default+0x5
> cpu_idle(c2283a98,e3392d24,c05ed78c,0,e3392d38) at cpu_idle+0x28
> idle_proc(0,e3392d38,0,c05ed968,0) at idle_proc+0x5d
> fork_exit(c05ed968,0,e3392d38) at fork_exit+0xa4
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xe3392d6c, ebp = 0 ---
> db>
>
> and i did "continue"
> and now its seeming to be running ok.
>
> please advise.
>
> Jason
>
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