It will hang and eventually display the message:
tcp_write_wakeup: fragment failed
I noticed that the "Total failed network buffer allocs" counter displayed
by Alt-Sysrq-M goes up by a few thousand every second while this is
happening.
I can still change VTs and can type text on consoles, such as syslogd's,
which are echoed by the kernel. However, all userland stuff stops working.
If I kill the news server with Alt-Sysrq-N (sends SIGTERM to last
process), then it all gets better, until I try to run tin again.
This appears to occur when there are 0 large free pages (eg 128k, 64k) as
shown by SysRq-M.
When there are some large free pages left, tin works fine.
-- PGP 0xD4C9C0B1 http://www.geocities.com/SiliconValley/Lakes/7456/ 1016kb of spam & junk filtered; Linux 2.1.48 on dass up for 2 hours