Public bug reported:
Hi,
We have some internal 32-bit applications that end up with a lot of
files open. If they in turn call a program that links with libxcb, more
often than not, that program segfaults.
This has been determined to be because libxcb uses select() and the man
page for select() says this:
"An fd_set is a fixed size buffer. Executing FD_CLR() or FD_SET()
with a value of fd that is negative or is equal to or larger than
FD_SETSIZE will result in undefined behavior. Moreover, POSIX requires
fd to be a valid file descriptor."
Later versions of libxcb address this by using poll()
I'm attaching the patch that we are using internally against libxcb
1.1-1.1
If you make this SRU, please also ensure that the 32-bit version in
ia32-libs gets updated.
** Affects: libxcb (Ubuntu)
Importance: Undecided
Status: New
--
Applications that use libxcb 1.1 cannot open more than 1024 files
https://bugs.launchpad.net/bugs/393509
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