openSUSE 13.2 64bit KDE 4.14.3 用 krunner 启动 assistant-qt5 突然卡住，鼠标键盘失灵，无法切换 tty，只有硬重启。
幸好还有 kernel log，但无法确定问题，因此在此请教各位大神～
哈哈 先谢过大家～
上 log：
Dec 11 00:44:45 Pulphead kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
Dec 11 00:44:45 Pulphead kernel: IP: <ffffffff8132cb70>] interval_tree_iter_next+0x0/0x60
Dec 11 00:44:45 Pulphead kernel: PGD 6cb52067 PUD 6cb53067 PMD 0
Dec 11 00:44:45 Pulphead kernel: Oops: 0000 #1] PREEMPT SMP
Dec 11 00:44:45 Pulphead kernel: Modules linked in: hid_logitech_dj nls_iso8859_1 nls_cp437 vfat fat st sr_mod cdrom uas usb_storage fuse ctr ccm rfcomm vboxpci(O) vboxnetadp(O) vboxnetflt(O) xt_pkttype xt_LOG xt_limit af_packet vboxdrv(O) ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables bnep xfs libcrc32c arc4 joydev hid_multitouch x86_pkg_temp_thermal pn544_mei mei_phy iwlmvm pn544 rtsx_pci_sdmmc rtsx_pci_ms mmc_core memstick hci nfc mac80211 iTCO_wdt intel_powerclamp dell_laptop iTCO_vendor_support coretemp dell_wmi uvcvideo sparse_keymap snd_hda_codec_realtek dcdbas kvm_intel i2c_i801 videobuf2_vmalloc
Dec 11 00:44:45 Pulphead kernel: pcspkr serio_raw videobuf2_memops ecb kvm videobuf2_core snd_hda_codec_generic snd_hda_codec_hdmi v4l2_common videodev snd_hda_intel btusb bluetooth snd_hda_controller snd_hda_codec iwlwifi 6lowpan_iphc snd_hwdep snd_pcm cfg80211 rfkill rtsx_pci fan thermal snd_timer int3403_thermal snd battery ac soundcore dell_smo8800 lpc_ich mfd_core mei_me mei shpchp processor btrfs xor raid6_pq dm_crypt algif_skcipher af_alg sg crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd mxm_wmi i915(O) i2c_algo_bit drm_kms_helper drm(O) xhci_hcd wmi video button dm_mirror dm_region_hash dm_log dm_mod bbswitch(O) [last unloaded: nvidia]
Dec 11 00:44:45 Pulphead kernel: CPU: 6 PID: 25786 Comm: QThread Tainted: P W O 3.16.6-2-desktop #1
Dec 11 00:44:45 Pulphead kernel: Hardware name: Dell Inc. Dell Precision M3800/Dell Precision M3800, BIOS A06 07/16/2014
Dec 11 00:44:45 Pulphead kernel: task: ffff88022ebde3d0 ti: ffff88022e9c8000 task.ti: ffff88022e9c8000
Dec 11 00:44:45 Pulphead kernel: RIP: 0010:<ffffffff8132cb70>] <ffffffff8132cb70>] interval_tree_iter_next+0x0/0x60
Dec 11 00:44:45 Pulphead kernel: RSP: 0018:ffff88022e9cbd30 EFLAGS: 00010246
Dec 11 00:44:45 Pulphead kernel: RAX: 0000000000000000 RBX: ffff8802c46bd458 RCX: 0000000000000000
Dec 11 00:44:45 Pulphead kernel: RDX: 00007f98cc339fff RSI: 00007f98cc339000 RDI: 0000000000000000
Dec 11 00:44:45 Pulphead kernel: RBP: 00007f98cc339000 R08: ffffffffa013dec0 R09: 0000000000000000
Dec 11 00:44:45 Pulphead kernel: R10: 0000000000000000 R11: ffff88022e9cbf48 R12: ffff8802c46bd458
Dec 11 00:44:45 Pulphead kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 00007f98cc339000
Dec 11 00:44:45 Pulphead kernel: FS: 00007f9922011700(0000) GS:ffff88042fb80000(0000) knlGS:0000000000000000
Dec 11 00:44:45 Pulphead kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Dec 11 00:44:45 Pulphead kernel: CR2: 0000000000000008 CR3: 000000004f87a000 CR4: 00000000001407e0
Dec 11 00:44:45 Pulphead kernel: Stack:
Dec 11 00:44:45 Pulphead kernel: ffffffffa013e078 ffff8802c46bd440 00007f98cc339fff 0000000000000000
Dec 11 00:44:45 Pulphead kernel: ffff88041b150800 ffff8802c46bd470 ffff8802c46bd458 ffff8800c521cbc0
Dec 11 00:44:45 Pulphead kernel: 00007f98cc33a000 00007f98cc339000 0000000000000000 00007f98cc339000
Dec 11 00:44:45 Pulphead kernel: Call Trace:
Dec 11 00:44:45 Pulphead kernel: <ffffffffa013e078>] i915_gem_userptr_mn_invalidate_range_start+0x1b8/0x240 [i915]
Dec 11 00:44:45 Pulphead kernel: <ffffffff81197064>] __mmu_notifier_invalidate_range_start+0x54/0x80
Dec 11 00:44:45 Pulphead kernel: <ffffffff8117dd88>] change_protection_range+0x878/0x890
Dec 11 00:44:45 Pulphead kernel: <ffffffff8117ded0>] mprotect_fixup+0x110/0x270
Dec 11 00:44:45 Pulphead kernel: <ffffffff8117e18b>] SyS_mprotect+0x15b/0x270
Dec 11 00:44:45 Pulphead kernel: <ffffffff8162182d>] system_call_fastpath+0x1a/0x1f
Dec 11 00:44:45 Pulphead kernel: <00007f9931ec2957>] 0x7f9931ec2956
Dec 11 00:44:45 Pulphead kernel: Code: 66 66 2e 0f 1f 84 00 00 00 00 00 48 8b 3f 48 85 ff 74 08 48 39 77 28 72 02 eb a0 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 <48> 8b 4f 08 48 85 c9 74 1b 48 39 71 28 72 15 eb 38 0f 1f 80 00
Dec 11 00:44:45 Pulphead kernel: RIP <ffffffff8132cb70>] interval_tree_iter_next+0x0/0x60
Dec 11 00:44:45 Pulphead kernel: RSP <ffff88022e9cbd30>
Dec 11 00:44:45 Pulphead kernel: CR2: 0000000000000008
Dec 11 00:44:45 Pulphead kernel: --- end trace a0e099efc7de8a32 ]---
Dec 11 00:44:45 Pulphead kernel: note: QThread[25786] exited with preempt_count 1
Dec 11 00:44:45 Pulphead kernel: BUG: scheduling while atomic: QThread/25786/0x00000002
Dec 11 00:44:45 Pulphead kernel: Modules linked in: hid_logitech_dj nls_iso8859_1 nls_cp437 vfat fat st sr_mod cdrom uas usb_storage fuse ctr ccm rfcomm vboxpci(O) vboxnetadp(O) vboxnetflt(O) xt_pkttype xt_LOG xt_limit af_packet vboxdrv(O) ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables bnep xfs libcrc32c arc4 joydev hid_multitouch x86_pkg_temp_thermal pn544_mei mei_phy iwlmvm pn544 rtsx_pci_sdmmc rtsx_pci_ms mmc_core memstick hci nfc mac80211 iTCO_wdt intel_powerclamp dell_laptop iTCO_vendor_support coretemp dell_wmi uvcvideo sparse_keymap snd_hda_codec_realtek dcdbas kvm_intel i2c_i801 videobuf2_vmalloc
Dec 11 00:44:45 Pulphead kernel: pcspkr serio_raw videobuf2_memops ecb kvm videobuf2_core snd_hda_codec_generic snd_hda_codec_hdmi v4l2_common videodev snd_hda_intel btusb bluetooth snd_hda_controller snd_hda_codec iwlwifi 6lowpan_iphc snd_hwdep snd_pcm cfg80211 rfkill rtsx_pci fan thermal snd_timer int3403_thermal snd battery ac soundcore dell_smo8800 lpc_ich mfd_core mei_me mei shpchp processor btrfs xor raid6_pq dm_crypt algif_skcipher af_alg sg crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd mxm_wmi i915(O) i2c_algo_bit drm_kms_helper drm(O) xhci_hcd wmi video button dm_mirror dm_region_hash dm_log dm_mod bbswitch(O) [last unloaded: nvidia]
Dec 11 00:44:45 Pulphead kernel: CPU: 6 PID: 25786 Comm: QThread Tainted: P D W O 3.16.6-2-desktop #1
Dec 11 00:44:45 Pulphead kernel: Hardware name: Dell Inc. Dell Precision M3800/Dell Precision M3800, BIOS A06 07/16/2014
Dec 11 00:44:45 Pulphead kernel: ffff88022e9cb9a8 ffffffff8161ab03 ffff88022ebde3d0 ffffffff816151d3
Dec 11 00:44:45 Pulphead kernel: ffff88022e9cba08 ffffffff8161d7d2 ffff88022ebde3d0 0000000000013740
Dec 11 00:44:45 Pulphead kernel: ffff88022e9cbfd8 0000000000013740 0000000000000006 ffff88022ebde3d0
Dec 11 00:44:45 Pulphead kernel: Call Trace:
Dec 11 00:44:45 Pulphead kernel: <ffffffff8100519e>] dump_trace+0x8e/0x350
Dec 11 00:44:45 Pulphead kernel: <ffffffff81005506>] show_stack_log_lvl+0xa6/0x190
Dec 11 00:44:45 Pulphead kernel: <ffffffff81006c01>] show_stack+0x21/0x50
Dec 11 00:44:45 Pulphead kernel: <ffffffff8161ab03>] dump_stack+0x49/0x6a
Dec 11 00:44:45 Pulphead kernel: <ffffffff816151d3>] __schedule_bug+0x4c/0x5a
Dec 11 00:44:45 Pulphead kernel: <ffffffff8161d7d2>] thread_return+0x480/0x48e
Dec 11 00:44:45 Pulphead kernel: <ffffffff8162015d>] rwsem_down_read_failed+0xcd/0x130
Dec 11 00:44:45 Pulphead kernel: <ffffffff81323514>] call_rwsem_down_read_failed+0x14/0x30
Dec 11 00:44:45 Pulphead kernel: <ffffffff8161fbe3>] down_read+0x13/0x20
Dec 11 00:44:45 Pulphead kernel: <ffffffff8105de51>] do_exit+0x171/0xa90
Dec 11 00:44:45 Pulphead kernel: <ffffffff81006537>] oops_end+0x97/0xe0
Dec 11 00:44:45 Pulphead kernel: <ffffffff8161470b>] no_context+0x2b2/0x2be
Dec 11 00:44:45 Pulphead kernel: <ffffffff81048c14>] __do_page_fault+0x84/0x530
Dec 11 00:44:45 Pulphead kernel: <ffffffff816237d8>] page_fault+0x28/0x30
Dec 11 00:44:45 Pulphead kernel: <ffffffff8132cb70>] interval_tree_iter_first+0x20/0x20
Dec 11 00:44:45 Pulphead kernel: <ffffffffa013e078>] i915_gem_userptr_mn_invalidate_range_start+0x1b8/0x240 [i915]
Dec 11 00:44:45 Pulphead kernel: <ffffffff81197064>] __mmu_notifier_invalidate_range_start+0x54/0x80
Dec 11 00:44:45 Pulphead kernel: <ffffffff8117dd88>] change_protection_range+0x878/0x890
Dec 11 00:44:45 Pulphead kernel: <ffffffff8117ded0>] mprotect_fixup+0x110/0x270
Dec 11 00:44:45 Pulphead kernel: <ffffffff8117e18b>] SyS_mprotect+0x15b/0x270
Dec 11 00:44:45 Pulphead kernel: <ffffffff8162182d>] system_call_fastpath+0x1a/0x1f
Dec 11 00:44:45 Pulphead kernel: <00007f9931ec2957>] 0x7f9931ec2956
Dec 11 00:45:01 Pulphead cron[25797]: pam_unix(crond:session): session opened for user root by (uid=0)
Dec 11 00:45:01 Pulphead systemd[25798]: pam_unix(systemd-user:session): session opened for user root by (uid=0)
Dec 11 00:45:01 Pulphead CRON[25797]: pam_unix(crond:session): session closed for user root
Dec 11 00:45:01 Pulphead systemd[25799]: pam_unix(systemd-user:session): session closed for user root
Dec 11 00:45:12 Pulphead kernel: BUG: soft lockup - CPU#4 stuck for 22s! [assistant-qt5:25778]
Dec 11 00:45:12 Pulphead kernel: Modules linked in: hid_logitech_dj nls_iso8859_1 nls_cp437 vfat fat st sr_mod cdrom uas usb_storage fuse ctr ccm rfcomm vboxpci(O) vboxnetadp(O) vboxnetflt(O) xt_pkttype xt_LOG xt_limit af_packet vboxdrv(O) ip6t_REJECT xt_tcpudp nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw ipt_REJECT iptable_raw xt_CT iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables bnep xfs libcrc32c arc4 joydev hid_multitouch x86_pkg_temp_thermal pn544_mei mei_phy iwlmvm pn544 rtsx_pci_sdmmc rtsx_pci_ms mmc_core memstick hci nfc mac80211 iTCO_wdt intel_powerclamp dell_laptop iTCO_vendor_support coretemp dell_wmi uvcvideo sparse_keymap snd_hda_codec_realtek dcdbas kvm_intel i2c_i801 videobuf2_vmalloc
Dec 11 00:45:12 Pulphead kernel: pcspkr serio_raw videobuf2_memops ecb kvm videobuf2_core snd_hda_codec_generic snd_hda_codec_hdmi v4l2_common videodev snd_hda_intel btusb bluetooth snd_hda_controller snd_hda_codec iwlwifi 6lowpan_iphc snd_hwdep snd_pcm cfg80211 rfkill rtsx_pci fan thermal snd_timer int3403_thermal snd battery ac soundcore dell_smo8800 lpc_ich mfd_core mei_me mei shpchp processor btrfs xor raid6_pq dm_crypt algif_skcipher af_alg sg crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd mxm_wmi i915(O) i2c_algo_bit drm_kms_helper drm(O) xhci_hcd wmi video button dm_mirror dm_region_hash dm_log dm_mod bbswitch(O) [last unloaded: nvidia]
Dec 11 00:45:12 Pulphead kernel: CPU: 4 PID: 25778 Comm: assistant-qt5 Tainted: P D W O 3.16.6-2-desktop #1
Dec 11 00:45:12 Pulphead kernel: Hardware name: Dell Inc. Dell Precision M3800/Dell Precision M3800, BIOS A06 07/16/2014
Dec 11 00:45:12 Pulphead kernel: task: ffff8802306ae290 ti: ffff88004f828000 task.ti: ffff88004f828000
Dec 11 00:45:12 Pulphead kernel: RIP: 0010:<ffffffff81621240>] <ffffffff81621240>] _raw_spin_lock+0x30/0x40
Dec 11 00:45:12 Pulphead kernel: RSP: 0018:ffff88004f82bd78 EFLAGS: 00000297
Dec 11 00:45:12 Pulphead kernel: RAX: 0000000000000000 RBX: ffffffff8114b2b1 RCX: 0000000000000001
Dec 11 00:45:12 Pulphead kernel: RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffff8802c46bd440
Dec 11 00:45:12 Pulphead kernel: RBP: ffff8802c46bd440 R08: dffc73799621cbc0 R09: ffff8802b1eb3c00
Dec 11 00:45:12 Pulphead kernel: R10: ffffffffa01b22e0 R11: ffff88004f82be28 R12: 0000000000000202
Dec 11 00:45:12 Pulphead kernel: R13: 0000000000000202 R14: ffff8804192bd330 R15: ffff88004f82bd70
Dec 11 00:45:12 Pulphead kernel: FS: 00007f9936f04780(0000) GS:ffff88042fb00000(0000) knlGS:0000000000000000
Dec 11 00:45:12 Pulphead kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Dec 11 00:45:12 Pulphead kernel: CR2: 00007f98c1e7f820 CR3: 000000004f87a000 CR4: 00000000001407e0
Dec 11 00:45:12 Pulphead kernel: Stack:
Dec 11 00:45:12 Pulphead kernel: ffffffffa013daa5 000080d000e78000 ffff880099df5740 ffff88004f82be28
Dec 11 00:45:12 Pulphead kernel: ffff8802871a8600 00000000fffffff4 ffff8802871a8600 00000000fffffff2
Dec 11 00:45:12 Pulphead kernel: ffffffffa013e4ec ffff8800bc4478b8 ffff88004f82be28 0000000000000073
Dec 11 00:45:12 Pulphead kernel: Call Trace:
Dec 11 00:45:12 Pulphead kernel: <ffffffffa013daa5>] i915_gem_userptr_init__mmu_notifier+0x295/0x3c0 [i915]
Dec 11 00:45:12 Pulphead kernel: <ffffffffa013e4ec>] i915_gem_userptr_ioctl+0x12c/0x1e0 [i915]
Dec 11 00:45:12 Pulphead kernel: <ffffffffa00958c7>] drm_ioctl+0x1c7/0x5b0 [drm]
Dec 11 00:45:12 Pulphead kernel: <ffffffff811c9d27>] do_vfs_ioctl+0x2e7/0x4c0
Dec 11 00:45:12 Pulphead kernel: <ffffffff811c9f81>] SyS_ioctl+0x81/0xa0
Dec 11 00:45:12 Pulphead kernel: <ffffffff8162182d>] system_call_fastpath+0x1a/0x1f
Dec 11 00:45:12 Pulphead kernel: <00007f9931ebf397>] 0x7f9931ebf396
Dec 11 00:45:12 Pulphead kernel: Code: 65 ff 04 25 60 b9 00 00 b8 00 00 01 00 f0 0f c1 07 89 c2 c1 ea 10 66 39 c2 89 d1 75 01 c3 0f b7 07 66 39 d0 74 f7 f3 90 0f b7 07 <66> 39 c8 75 f6 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00
Dec 11 00:45:40 Pulphead kernel: BUG: soft lockup - CPU#4 stuck for 22s! [assistant-qt5:25778]