Messages in this thread | | | Date | Mon, 9 Jun 2003 14:08:34 -0700 | From | Andrew Morton <> | Subject | Re: 2.5.70 (virgin) hangs running SDET |
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"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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