Description of problem:
Essentially, when kernel receives broken UDP packet(s), select() function must
But, select() returns in any RHEL4 (RHEL4U0 - RHEL4U4).
We made udp_poll() backport patch for not returning even if kernel receives
broken UDP packet.
This patch is for kernel-2.6.9-42.0.3.EL (and kernel-2.6.9-42.EL).
It was no problem for us though had verified with our business system.
Please take it by the following update! (=> RHEL4U5)
Version-Release number of selected component (if applicable):
RHEL4U4: kernel-2.6.9-42.0.3.EL (and kernel-2.6.9-42.EL)
When select() observes incoming UDP packet by server, clinent sends broken UDP
Then, select() returns normally by positive value.
Therefore, recvfrom() (= the functions that acquire packet) freezes until
kernel receives next normal packet.
select() returns normally when receives broken UDP packet(s)
select() doesn't return when receives broken UDP packet(s)
- It was in the broken IP telephone terminal that sent a broken packet.
- man 2 select
bkcvs.git;a=summary (but git is down now)
Created attachment 139450 [details]
kernel-2.6.9-42.EL-udp_poll.patch - backported udp_poll() for fixing select() problem
*** This bug has been marked as a duplicate of 212321 ***