I got this messages on the logs and sometimes the session freezes when I'm using Firefox: mai 24 20:12:16 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 50331 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 mai 24 20:12:16 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 50253 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 mai 24 20:12:34 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 52142 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 mai 24 20:13:28 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 51884 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 mai 24 20:14:07 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 52087 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 mai 24 20:14:13 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 50755 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 mai 24 20:14:19 glados firefox.desktop[9642]: [Parent 9642, IPC I/O Parent] WARNING: process 50806 is a zombie: file /builds/worker/checkouts/gecko/ipc/chromium/src/base/process_util_posix.cc:245 lines 8174-8233/8233 (END)