Hi, Kubuntu 11.04 on x86_64 here. Using nvidia-glx-185 - 270.41.06-0ubuntu1. Resizing konsole window crashed system. Shh still worked so I did a dmesg: [115728.390698] ------------[ cut here ]------------ [115728.390701] kernel BUG at /build/buildd/linux-2.6.38/mm/slub.c:2747! [115728.390703] invalid opcode: 0000 [#1] SMP [115728.390705] last sysfs file: /sys/devices/platform/coretemp.3/temp1_input [115728.390706] CPU 0 [115728.390707] Modules linked in: isofs udf snd_seq_dummy serpent xts gf128mul md4 nls_utf8 cifs binfmt_misc vboxnetadp vboxnetflt vboxdrv kvm_intel kvm parport_pc ppdev nfsd exportfs nfs lockd fscache nfs_acl auth_rpcgss sunrpc autofs4 dm_crypt vesafb snd_hda_codec_realtek tuner_simple tuner_types snd_hda_intel tuner snd_hda_codec tvaudio snd_hwdep snd_bt87x tda7432 msp3400 nvidia(P) snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq bttv ir_lirc_codec lirc_dev snd_timer i2c_algo_bit v4l2_common snd_seq_device ir_sony_decoder videodev ir_jvc_decoder v4l2_compat_ioctl32 ir_rc6_decoder videobuf_dma_sg ir_rc5_decoder videobuf_core btcx_risc ir_nec_decoder psmouse rc_core serio_raw tveeprom snd i7core_edac soundcore snd_page_alloc edac_core asus_atk0110 coretemp lp parport usbhid hid r8169 firewire_ohci ahci firewire_core libahci crc_itu_t [115728.390747] [115728.390749] Pid: 1074, comm: Xorg Tainted: P 2.6.38-8-generic #42-Ubuntu System manufacturer System Product Name/P6T SE [115728.390753] RIP: 0010:[] [] kfree+0x11b/0x120 [115728.390758] RSP: 0018:ffff8801a30ffc88 EFLAGS: 00010246 [115728.390760] RAX: 0200000000000000 RBX: ffff8801a11c5000 RCX: 0000000000000000 [115728.390761] RDX: 0000000000d08e28 RSI: ffffea0005b3e318 RDI: ffff8801a11c5000 [115728.390762] RBP: ffff8801a30ffca8 R08: ffff8801a3ed2f08 R09: ffff8801256ad840 [115728.390764] R10: 00000000c0104c11 R11: 0000000000003246 R12: ffff8801ae505c00 [115728.390765] R13: ffffffffa060f19b R14: ffff8801ae1de000 R15: 0000000000000004 [115728.390767] FS: 00007f28546ec8a0(0000) GS:ffff8800bf400000(0000) knlGS:0000000000000000 [115728.390769] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [115728.390770] CR2: 00000000025cf102 CR3: 00000001ae704000 CR4: 00000000000006f0 [115728.390772] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [115728.390773] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [115728.390775] Process Xorg (pid: 1074, threadinfo ffff8801a30fe000, task ffff8801a2d72dc0) [115728.390776] Stack: [115728.390777] ffff8801a30ffcb8 0000000000000000 ffff8801ae505c00 0000000000000004 [115728.390780] ffff8801a30ffcb8 ffffffffa060f19b ffff8801a3ed2c98 ffffffffa05e3368 [115728.390782] ffff8801a3944010 ffffffffa03ec1cc ffff8801ae74f000 0000000000000001 [115728.390784] Call Trace: [115728.390917] [] os_free_mem+0x2b/0x40 [nvidia] [115728.391030] [] _nv022926rm+0xe/0x13 [nvidia] [115728.391167] [] ? _nv012669rm+0x47/0x7e [nvidia] [115728.391304] [] ? _nv012702rm+0x35/0xde [nvidia] [115728.391441] [] ? _nv013083rm+0xf4/0x388 [nvidia] [115728.391577] [] ? _nv013084rm+0xd44/0x10cd [nvidia] [115728.391713] [] ? _nv013085rm+0x8b/0xb3 [nvidia] [115728.391778] [] ? _nv002392rm+0x221/0x237 [nvidia] [115728.391841] [] ? _nv002013rm+0x5b/0x94 [nvidia] [115728.391952] [] ? _nv002411rm+0x3e5/0x6a0 [nvidia] [115728.392062] [] ? rm_ioctl+0x2f/0x67 [nvidia] [115728.392170] [] ? nv_kern_ioctl+0x154/0x460 [nvidia] [115728.392279] [] ? nv_kern_unlocked_ioctl+0x21/0x30 [nvidia] [115728.392283] [] ? do_vfs_ioctl+0x8f/0x360 [115728.392286] [] ? sys_rt_sigreturn+0x106/0x140 [115728.392288] [] ? sys_ioctl+0x91/0xa0 [115728.392290] [] ? system_call_fastpath+0x16/0x1b [115728.392292] Code: 75 e6 e9 27 ff ff ff 48 89 da e8 11 fc ff ff 90 eb a5 f6 c4 c0 74 14 48 89 f7 e8 71 1a fc ff 90 eb 9f 48 8b 76 10 e9 42 ff ff ff <0f> 0b 0f 1f 00 55 48 89 e5 53 48 83 ec 08 0f 1f 44 00 00 48 8d [115728.392311] RIP [] kfree+0x11b/0x120 [115728.392313] RSP [115728.392315] ---[ end trace 16a5c573a10b95ec ]--- I was able to reproduce the crash by trying to resize konsole window again. May be that helps :-) Cheers Lain