Debian 8.2 crashes on a daily basis, sometimes twice a day with the "NULL pointer dereference" bug. I'm running Debian 8.2 on ASROCK Q1900-ITX motherboard with Intel® Quad-Core J1900 CPU. The issue seems occurring only when I run utserver program hwich is a utorrent standalone server for Linux. Syslog was able to capture the kernel messages only once during such crashes for some reason, so here it is: Dec 10 10:33:42 ragnarok kernel: [28406.736996] ------------[ cut here ]------------ Dec 10 10:33:42 ragnarok kernel: [28406.737013] WARNING: CPU: 1 PID: 1221 at /build/linux-x1KGLI/linux-3.16.7-ckt11/kernel/futex.c:1093 wake_futex+0x48/0x80() Dec 10 10:33:42 ragnarok kernel: [28406.737017] Modules linked in: xt_multiport iptable_filter ip_tables x_tables nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc intel_powerclamp intel_rapl coretemp kvm crc32_pclmul ghash_ clmulni_intel psmouse snd_soc_rt5640 snd_soc_rl6231 snd_soc_core ppdev iTCO_wdt iTCO_vendor_support serio_raw cryptd i915 snd_hda_codec_hdmi evdev snd_compress pcspkr snd_hda_codec_realtek snd_hda_codec_generic battery regmap_i2c i2c_des ignware_platform drm_kms_helper drm i2c_designware_core snd_hda_intel parport_pc parport video lpc_ich mfd_core shpchp i2c_i801 i2c_algo_bit snd_hda_controller snd_hda_codec iosf_mbi processor snd_hwdep snd_pcm snd_timer snd soundcore sn d_soc_sst_acpi button autofs4 ext4 crc16 mbcache jbd2 sg sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul crct10dif_common crc32c_intel ahci libahci xhci_hcd libata fan r8169 mii usbcore scsi_mod thermal usb_common thermal_sys i2c_hi d hid i2c_core sdhci_acpi sdhci mmc_core Dec 10 10:33:42 ragnarok kernel: [28406.737139] CPU: 1 PID: 1221 Comm: utserver Not tainted 3.16.0-4-amd64 #1 Debian 3.16.7-ckt11-1+deb8u6 Dec 10 10:33:42 ragnarok kernel: [28406.737143] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Q1900-ITX, BIOS P1.40 10/31/2014 Dec 10 10:33:42 ragnarok kernel: [28406.737147] 0000000000000009 ffffffff8150b4e5 0000000000000000 ffffffff81067767 Dec 10 10:33:42 ragnarok kernel: [28406.737154] ffff880073e5e3d0 ffff880075c43d40 00000000ffffffff 0000000000000001 Dec 10 10:33:42 ragnarok kernel: [28406.737161] ffffc90000378ec8 ffffffff810d1bc8 ffff880075c43d40 0000000000000001 Dec 10 10:33:42 ragnarok kernel: [28406.737167] Call Trace: Dec 10 10:33:42 ragnarok kernel: [28406.737178] [<ffffffff8150b4e5>] ? dump_stack+0x41/0x51 Dec 10 10:33:42 ragnarok kernel: [28406.737187] [<ffffffff81067767>] ? warn_slowpath_common+0x77/0x90 Dec 10 10:33:42 ragnarok kernel: [28406.737194] [<ffffffff810d1bc8>] ? wake_futex+0x48/0x80 Dec 10 10:33:42 ragnarok kernel: [28406.737201] [<ffffffff810d1cff>] ? futex_wake+0xff/0x120 Dec 10 10:33:42 ragnarok kernel: [28406.737208] [<ffffffff810d3bee>] ? do_futex+0x11e/0xb60 Dec 10 10:33:42 ragnarok kernel: [28406.737216] [<ffffffff811ac9e6>] ? vfs_fstatat+0x46/0x90 Dec 10 10:33:42 ragnarok kernel: [28406.737223] [<ffffffff810d469e>] ? SyS_futex+0x6e/0x150 Dec 10 10:33:42 ragnarok kernel: [28406.737231] [<ffffffff815116cd>] ? system_call_fast_compare_end+0x10/0x15 Dec 10 10:33:42 ragnarok kernel: [28406.737248] BUG: unable to handle kernel NULL pointer dereference at 0000000000000064 Dec 10 10:33:42 ragnarok kernel: [28406.737383] IP: [<0000000000000064>] 0x64 Dec 10 10:33:42 ragnarok kernel: [28406.737455] PGD 75eb9067 PUD 75eb8067 PMD 0 Dec 10 10:33:42 ragnarok kernel: [28406.737532] Oops: 0010 [#1] SMP Dec 10 10:33:42 ragnarok kernel: [28406.737589] Modules linked in: xt_multiport iptable_filter ip_tables x_tables nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache sunrpc intel_powerclamp intel_rapl coretemp kvm crc32_pclmul ghash_ clmulni_intel psmouse snd_soc_rt5640 snd_soc_rl6231 snd_soc_core ppdev iTCO_wdt iTCO_vendor_support serio_raw cryptd i915 snd_hda_codec_hdmi evdev snd_compress pcspkr snd_hda_codec_realtek snd_hda_codec_generic battery regmap_i2c i2c_des ignware_platform drm_kms_helper drm i2c_designware_core snd_hda_intel parport_pc parport video lpc_ich mfd_core shpchp i2c_i801 i2c_algo_bit snd_hda_controller snd_hda_codec iosf_mbi processor snd_hwdep snd_pcm snd_timer snd soundcore sn d_soc_sst_acpi button autofs4 ext4 crc16 mbcache jbd2 sg sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul crct10dif_common crc32c_intel ahci libahci xhci_hcd libata fan r8169 mii usbcore scsi_mod thermal usb_common thermal_sys i2c_hi d hid i2c_core sdhci_acpi sdhci mmc_core Dec 10 10:33:42 ragnarok kernel: [28406.739162] CPU: 1 PID: 1221 Comm: utserver Not tainted 3.16.0-4-amd64 #1 Debian 3.16.7-ckt11-1+deb8u6 Dec 10 10:33:42 ragnarok kernel: [28406.739301] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Q1900-ITX, BIOS P1.40 10/31/2014 Dec 10 10:33:42 ragnarok kernel: [28406.739443] task: ffff880073e5e3d0 ti: ffff880075c40000 task.ti: ffff880075c40000 Dec 10 10:33:42 ragnarok kernel: [28406.739554] RIP: 0010:[<0000000000000064>] [<0000000000000064>] 0x64 Dec 10 10:33:42 ragnarok kernel: [28406.739661] RSP: 0018:ffff880075c43d48 EFLAGS: 00010282 Dec 10 10:33:42 ragnarok kernel: [28406.739742] RAX: 0000000000000000 RBX: ffff880075c43df8 RCX: 0000000000000006 Dec 10 10:33:42 ragnarok kernel: [28406.739848] RDX: 0000000000000007 RSI: 0000000000000046 RDI: 00007f2740ff8e38 Dec 10 10:33:42 ragnarok kernel: [28406.739955] RBP: ffff880079283fc0 R08: 000000000000000a R09: 0000000000000000 Dec 10 10:33:42 ragnarok kernel: [28406.740062] R10: 00000000000002d1 R11: ffff880075c439b6 R12: 0000000000000000 Dec 10 10:33:42 ragnarok kernel: [28406.740168] R13: 0000000000000000 R14: ffffffff8173f153 R15: 0000000000000000 Dec 10 10:33:42 ragnarok kernel: [28406.740276] FS: 00007f2740ff9700(0000) GS:ffff880079280000(0000) knlGS:0000000000000000 Dec 10 10:33:42 ragnarok kernel: [28406.740397] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Dec 10 10:33:42 ragnarok kernel: [28406.740483] CR2: 0000000000000064 CR3: 0000000075e26000 CR4: 00000000001007e0 Dec 10 10:33:42 ragnarok kernel: [28406.740589] Stack: Dec 10 10:33:42 ragnarok kernel: [28406.740622] ffff880075c43d48 ffff880075c43d48 ffff880036b2bd58 ffffc90000378ec8 Dec 10 10:33:42 ragnarok kernel: [28406.740747] ffff880073e5e3d0 ffffc90000378ec4 00000000013fa000 ffff880075cde840 Dec 10 10:33:42 ragnarok kernel: [28406.740872] 00000000000005d8 0000000000000000 0000000000000000 0000000000000000 Dec 10 10:33:42 ragnarok kernel: [28406.740996] Call Trace: Dec 10 10:33:42 ragnarok kernel: [28406.741040] [<ffffffff810d1bc8>] ? wake_futex+0x48/0x80 Dec 10 10:33:42 ragnarok kernel: [28406.741125] [<ffffffff810d1cff>] ? futex_wake+0xff/0x120 Dec 10 10:33:42 ragnarok kernel: [28406.741210] [<ffffffff810d3bee>] ? do_futex+0x11e/0xb60 Dec 10 10:33:42 ragnarok kernel: [28406.741295] [<ffffffff811ac9e6>] ? vfs_fstatat+0x46/0x90 Dec 10 10:33:42 ragnarok kernel: [28406.741380] [<ffffffff810d469e>] ? SyS_futex+0x6e/0x150 Dec 10 10:33:42 ragnarok kernel: [28406.741464] [<ffffffff815116cd>] ? system_call_fast_compare_end+0x10/0x15 Dec 10 10:33:42 ragnarok kernel: [28406.741567] Code: Bad RIP value. Dec 10 10:33:42 ragnarok kernel: [28406.741625] RIP [<0000000000000064>] 0x64 Dec 10 10:33:42 ragnarok kernel: [28406.741697] RSP <ffff880075c43d48> Dec 10 10:33:42 ragnarok kernel: [28406.741750] CR2: 0000000000000064 Dec 10 10:33:42 ragnarok kernel: [28406.782621] ---[ end trace 202e1cd2b15cdc02 ]--- How can I resolve this ?