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If multiple ip processes are ran at the same time to set up separate network namespaces, and it is the first time so /run/netns has to be set up first, and they end up doing it at the same time, the processes might enter a recursive loop creating thousands of mount points, which might crash the system depending on resources available. Try to take a flock on /run/netns before doing the mount() dance, to ensure this cannot happen. But do not try too hard, and if it fails continue after printing a warning, to avoid introducing regressions. First reported on Debian: https://bugs.debian.org/949235 To reproduce (WARNING: run in a VM to avoid system lockups): for i in {0..9} do strace -e trace=mount -e inject=mount:delay_exit=1000000 ip \ netns add "testnetns$i" 2>&1 | tee "$i.log" & done wait The strace is to ensure the problem always reproduces, to add an artificial synchronization point after the first mount(). Reported-by: Etienne Dechamps <etienne@edechamps.fr> Signed-off-by: Luca Boccassi <bluca@debian.org> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> |
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|---|---|---|
| bash-completion | ||
| bridge | ||
| devlink | ||
| doc/actions | ||
| etc/iproute2 | ||
| examples/bpf | ||
| genl | ||
| include | ||
| ip | ||
| lib | ||
| man | ||
| misc | ||
| netem | ||
| rdma | ||
| schema | ||
| tc | ||
| testsuite | ||
| tipc | ||
| .clang-format | ||
| .gitignore | ||
| .mailmap | ||
| configure | ||
| COPYING | ||
| Makefile | ||
| README | ||
| README.devel | ||
This is a set of utilities for Linux networking.
Information:
https://wiki.linuxfoundation.org/networking/iproute2
Download:
http://www.kernel.org/pub/linux/utils/net/iproute2/
Stable version repository:
git://git.kernel.org/pub/scm/network/iproute2/iproute2.git
Development repository:
git://git.kernel.org/pub/scm/network/iproute2/iproute2-next.git
How to compile this.
--------------------
1. libdbm
arpd needs to have the berkeleydb development libraries. For Debian
users this is the package with a name like libdbX.X-dev.
DBM_INCLUDE points to the directory with db_185.h which
is the include file used by arpd to get to the old format Berkeley
database routines. Often this is in the db-devel package.
2. make
The makefile will automatically build a config.mk file which
contains definitions of libraries that may or may not be available
on the system such as: ATM, ELF, MNL, and SELINUX.
3. To make documentation, cd to doc/ directory , then
look at start of Makefile and set correct values for
PAGESIZE=a4 , ie: a4 , letter ... (string)
PAGESPERPAGE=2 , ie: 1 , 2 ... (numeric)
and make there. It assumes, that latex, dvips and psnup
are in your path.
4. This package includes matching sanitized kernel headers because
the build environment may not have up to date versions. See Makefile
if you have special requirements and need to point at different
kernel include files.
Stephen Hemminger
stephen@networkplumber.org
Alexey Kuznetsov
kuznet@ms2.inr.ac.ru