I can still produce this bug on Debian stable. It requires me to run a process that does a lot of random io in a a large file, such that some swap is consumed.
I also had an instance of X crashing as a result: [ 84441.029] BUG: triggered 'if (priv->num_active_touches > priv->num_slots)' [ 84441.029] BUG: ../../src/synaptics.c:3122 in UpdateTouchState() [ 84441.029] [ 84441.029] Backtrace: [ 84441.029] 0: /usr/bin/X (xorg_backtrace+0x36) [0x7f9db58fbd16] [ 84441.029] 1: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x3067) [0x7f9dafb4b067] [ 84441.029] 2: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x4733) [0x7f9dafb4c733] [ 84441.029] 3: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x7164) [0x7f9dafb4f164] [ 84441.029] 4: /usr/bin/X (0x7f9db577d000+0x8d947) [0x7f9db580a947] [ 84441.029] 5: /usr/bin/X (0x7f9db577d000+0xb1c18) [0x7f9db582ec18] [ 84441.029] 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f9db4aa5000+0xf0a0) [0x7f9db4ab40a0] [ 84441.029] 7: /lib/x86_64-linux-gnu/libc.so.6 (__select+0x13) [0x7f9db3881293] [ 84441.029] 8: /usr/bin/X (WaitForSomething+0x190) [0x7f9db58f9150] [ 84441.029] 9: /usr/bin/X (0x7f9db577d000+0x52bb1) [0x7f9db57cfbb1] [ 84441.029] 10: /usr/bin/X (0x7f9db577d000+0x41ec5) [0x7f9db57beec5] [ 84441.029] 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xfd) [0x7f9db37c9ead] [ 84441.029] 12: /usr/bin/X (0x7f9db577d000+0x4219d) [0x7f9db57bf19d] [ 84441.029] [ 84441.115] BUG: triggered 'if (priv->num_active_touches > priv->num_slots)' [ 84441.115] BUG: ../../src/synaptics.c:3122 in UpdateTouchState() [ 84441.115] [ 84441.115] Backtrace: [ 84441.115] 0: /usr/bin/X (xorg_backtrace+0x36) [0x7f9db58fbd16] [ 84441.115] 1: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x3067) [0x7f9dafb4b067] [ 84441.115] 2: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x4733) [0x7f9dafb4c733] [ 84441.115] 3: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x7164) [0x7f9dafb4f164] [ 84441.115] 4: /usr/bin/X (0x7f9db577d000+0x8d947) [0x7f9db580a947] [ 84441.115] 5: /usr/bin/X (0x7f9db577d000+0xb1c18) [0x7f9db582ec18] [ 84441.115] 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f9db4aa5000+0xf0a0) [0x7f9db4ab40a0] [ 84441.115] 7: /lib/x86_64-linux-gnu/libc.so.6 (__select+0x13) [0x7f9db3881293] [ 84441.115] 8: /usr/bin/X (WaitForSomething+0x190) [0x7f9db58f9150] [ 84441.115] 9: /usr/bin/X (0x7f9db577d000+0x52bb1) [0x7f9db57cfbb1] [ 84441.115] 10: /usr/bin/X (0x7f9db577d000+0x41ec5) [0x7f9db57beec5] [ 84441.115] 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xfd) [0x7f9db37c9ead] [ 84441.115] 12: /usr/bin/X (0x7f9db577d000+0x4219d) [0x7f9db57bf19d] [ 84441.115] [ 84442.200] BUG: triggered 'if (priv->num_active_touches > priv->num_slots)' [ 84442.200] BUG: ../../src/synaptics.c:3122 in UpdateTouchState() [ 84442.200] [ 84442.200] Backtrace: [ 84442.200] 0: /usr/bin/X (xorg_backtrace+0x36) [0x7f9db58fbd16] [ 84442.200] 1: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x3067) [0x7f9dafb4b067] [ 84442.200] 2: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x4733) [0x7f9dafb4c733] [ 84442.200] 3: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f9dafb48000+0x7164) [0x7f9dafb4f164] [ 84442.200] 4: /usr/bin/X (0x7f9db577d000+0x8d947) [0x7f9db580a947] [ 84442.200] 5: /usr/bin/X (0x7f9db577d000+0xb1c18) [0x7f9db582ec18] [ 84442.200] -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xserver-xorg-input-synaptics in Ubuntu. https://bugs.launchpad.net/bugs/1172094 Title: xorg synaptic driver crashes Status in xf86-input-synaptics: Confirmed Status in “xserver-xorg-input-synaptics” package in Ubuntu: Incomplete Status in “xserver-xorg-input-synaptics” package in Debian: Confirmed Status in “xserver-xorg-input-synaptics” package in Suse: In Progress Bug description: Recently, I've seen the Xorg synaptic driver crashing with the following in /var/log/Xorg.0.log: EE) BUG: triggered 'if (priv->num_active_touches > priv->num_slots)' (EE) BUG: ../../src/synaptics.c:3123 in UpdateTouchState() (EE) (EE) Backtrace: (EE) 0: /usr/bin/X (xorg_backtrace+0x36) [0x7f10ded9f476] (EE) 1: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f10d8b3b000+0x2e97) [0x7f10d8b3de97] (EE) 2: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f10d8b3b000+0x45b3) [0x7f10d8b3f5b3] (EE) 3: /usr/lib/xorg/modules/input/synaptics_drv.so (0x7f10d8b3b000+0x7014) [0x7f10d8b42014] (EE) 4: /usr/bin/X (0x7f10debef000+0x96927) [0x7f10dec85927] (EE) 5: /usr/bin/X (0x7f10debef000+0xc0328) [0x7f10decaf328] (EE) 6: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f10ddcf2000+0xfbd0) [0x7f10ddd01bd0] (EE) 7: /lib/x86_64-linux-gnu/libc.so.6 (__select+0x33) [0x7f10dca10233] (EE) 8: /usr/bin/X (WaitForSomething+0x190) [0x7f10ded9c870] (EE) 9: /usr/bin/X (0x7f10debef000+0x58811) [0x7f10dec47811] (EE) 10: /usr/bin/X (0x7f10debef000+0x4757a) [0x7f10dec3657a] (EE) 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7f10dc93fea5] (EE) 12: /usr/bin/X (0x7f10debef000+0x478c1) [0x7f10dec368c1] (EE) (EE) BUG: triggered 'if (priv->num_active_touches > priv->num_slots)' (EE) BUG: ../../src/synaptics.c:3123 in UpdateTouchState() (EE) ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: xorg 1:7.7+1ubuntu4 ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8 Uname: Linux 3.8.0-19-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.9.2-0ubuntu8 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true Date: Tue Apr 23 20:02:00 2013 DistUpgraded: Fresh install DistroCodename: raring DistroVariant: ubuntu DkmsStatus: virtualbox, 4.2.10, 3.8.0-18-generic, x86_64: installed virtualbox, 4.2.10, 3.8.0-19-generic, x86_64: installed virtualbox-guest, 4.2.10, 3.8.0-18-generic, x86_64: installed virtualbox-guest, 4.2.10, 3.8.0-19-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:21ce] InstallationDate: Installed on 2013-04-18 (5 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64+mac (20130418) Lsusb: Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 04f2:b221 Chicony Electronics Co., Ltd integrated camera MachineType: LENOVO 4177CTO MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-19-generic root=UUID=56291af5-0aa4-434c-bb67-6bd67ce6c142 ro rootflags=subvol=@ quiet SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 11/28/2011 dmi.bios.vendor: LENOVO dmi.bios.version: 83ET67WW (1.37 ) dmi.board.asset.tag: Not Available dmi.board.name: 4177CTO dmi.board.vendor: LENOVO dmi.board.version: Not Available dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.modalias: dmi:bvnLENOVO:bvr83ET67WW(1.37):bd11/28/2011:svnLENOVO:pn4177CTO:pvrThinkPadT420:rvnLENOVO:rn4177CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable: dmi.product.name: 4177CTO dmi.product.version: ThinkPad T420 dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.43-0ubuntu1 version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.1-0ubuntu3 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.1-0ubuntu3 version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.7-0ubuntu1 xserver.bootTime: Sun Apr 21 20:48:59 2013 xserver.configfile: default xserver.logfile: /var/log/Xorg.0.log xserver.version: 2:1.13.3-0ubuntu6 xserver.video_driver: intel To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-input-synaptics/+bug/1172094/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp