Linux nigthly is failing to build

[SimonSapin]

As of today October 2nd, the Linux nightly is 7409050 2014-09-29. The last three builds have failed: http://buildbot.rust-lang.org/builders/nightly-linux

Today’s build failed at make clean: http://buildbot.rust-lang.org/builders/nightly-linux/builds/123/steps/clean/logs/stdio

make clean
 in dir /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/obj (timeout 1200 secs)
 watching logfiles {}
 argv: ['make', 'clean']
 environment:
  HOME=/home/rustbuild
  LD_LIBRARY_PATH=/home/rustbuild/gcc-4.7.4/lib64:/home/rustbuild/gcc-4.7.4/lib
  LOGNAME=rustbuild
  PATH=/home/rustbuild/root64/bin:/home/rustbuild/gcc-4.7.4/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
  PWD=/home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/obj
  RUST_LOG=rustc=1
  SHELL=/bin/sh
  SHLVL=2
  USER=rustbuild
  _=/home/rustbuild/root64/bin/buildslave
 using PTY: False
cfg: build triple x86_64-unknown-linux-gnu
cfg: host triples i686-unknown-linux-gnu x86_64-unknown-linux-gnu
cfg: target triples i686-unknown-linux-gnu x86_64-unknown-linux-gnu
cfg: non-build host triples i686-unknown-linux-gnu
cfg: non-build target triples i686-unknown-linux-gnu
cfg: enabling more debugging (CFG_ENABLE_DEBUG)
cfg: host for i686-unknown-linux-gnu is i386
cfg: host for x86_64-unknown-linux-gnu is x86_64
cfg: os for i686-unknown-linux-gnu is unknown-linux-gnu
cfg: os for x86_64-unknown-linux-gnu is unknown-linux-gnu
cfg: using CC=gcc (CFG_CC)
cfg: no lualatex found, deferring to xelatex
cfg: no xelatex found, deferring to pdflatex
cfg: no pdflatex found, disabling LaTeX docs
cfg: no pandoc found, omitting PDF and EPUB docs
cfg: no llnextgen found, omitting grammar-verification
cfg: including snap rules
cfg: including dist rules
cfg: including clean rules
cleaning
rm: cannot chdir from `tmp/distcheck/srccheck/tmp' to `mk_rm_dir': Permission denied
make: *** [clean-misc] Error 1
program finished with exit code 2
elapsedTime=0.437535

CC @brson

[alexcrichton]

I've unblocked the bot and scheudled a new build.