[Info-vax] Processes hang on USB-access

[Volker Halle]

Joukj schrieb am Montag, 28. Februar 2022 um 10:58:12 UTC+1:

> From the next crash dump I find: 
> 
> FFFFFFFF.82988F8C IRP$L_FPC 00020087 SYS$K_VERSION_08+00067

This looks like an internal PID again, not a FORK PC.

If accesses to the USB disk seem to hang, issue a couple of those commands and see, if the IRP and FPC and IRP$L_QIO_P3 are always the same. That would prove, that the SAME IO operation is always current and is stuck.

SDA> SHOW DEV DNA2
SDA> READ SYSDEF

SDA> format @(ucb+ucb$l_irp)

Regarding the IO trace buffer: you could use a bigger buffer (SDA> IO START TRACE/BUFFER=n), only trace /DIO/NOBIO or write a batch job, which dumps the buffer contents to a file SDA> IO SHOW TRACE/DIO every couple of hours.

Volker.