"Martin J. Bligh" <mbligh@aracnet.com> wrote:
>
> I thought this was specific to the -mjb tree for a while, but I can
> reproduce it pretty easily on virgin 2.5.70 (but 2.5.69 didn't do
> this). Andrew looked and pointed out it seems to be an i_sem (ISTR
> some mention of /proc somewhere too?). Got a good sysrq+t trace out
> of the virgin kernel (on 16x NUMA-Q) ... below:
The ps instance which is spinning on kernel_flag in proc_root_lookup is
what's holding things up.
Or is it spinning in proc_lookup() or proc_pid_lookup()? I have a vague
feeling that I've seen these traces miss out the innermost stack slot...
Suggest:
a) Use CONFIG_SPINLINE, get a new sysrq-T trace
b) Enable spinlock debugging
c) Try disabling the sched_balance_exec() code.
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This archive was generated by hypermail 2b29 : Sun Jun 15 2003 - 22:00:21 EST