I was also bitten by this one, "ps" commands hangs indefinitely
sometimes.
On Fri, 7 Jan 2000, Peter Steiner wrote:
>
> Sometimes acces to /proc/<pid> blocks. In such a case the system load is
> increased by 1. It seems the blocking occurs, when a normal process is stuck
> in L-TLB, e.g.:
>
> Jan 7 17:25:56 kaili kernel: mgetty S 7FFFFFFF 0 7192 1 (L-TLB) 6422
> Jan 7 17:25:56 kaili kernel: sig: 0 0000000000000000 0000000000000000 :X
>
> Killing mgetty unblocks the stuck processes. The kernel threads (they are
> also L-TLB) do not have this problem.
>
> Further investigation shows:
>
> cd'ing to the /proc/<pid> of such a L-TLB process doesn't block,
> "echo *" doesn't block
> "ll stat statm status" doesn't block
>
> "ll cwd" blocks
>
> Peter
> --
> _ x ___ p.steiner@t-online.de (Peter Steiner)
> / \_/_\_ /,--' Linux User #55148 (http://counter.li.org/)
> \/>'~~~~//
> \_____/ perl -e'while(<>){s/=\n//g;s/=([\dA-F]{2})/chr(hex($1))/eg;print;}'
>
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