I tried with the upstream v4.4-wily kernel.

kick@kick-gs60:~/work/merges/freeipmi$ uname -a
Linux kick-gs60 4.4.0-040400-generic #201601101930 SMP Mon Jan 11 00:32:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

I couldn't re-use my previous schroot (couldn't mount with overlayfs). I've created a new one with --type=btrfs-snapshot.

My latop didn't freeze, but I still got traces in the syslog:

[  458.091294] BUG: unable to handle kernel NULL pointer dereference at 0000000000000334
[  458.091320] IP: [<ffffffffc0346fac>] btrfs_sync_file+0xcc/0x350 [btrfs]
[  458.091363] PGD 3e8de9067 PUD 3e8de8067 PMD 0 
[  458.091374] Oops: 0002 [#1] SMP 
[  458.091383] Modules linked in: overlay drbg ansi_cprng ctr ccm rfcomm nvram msr xt_multiport ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables xt_addrtype xt_conntrack xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables binfmt_misc bnep uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core btusb btrtl v4l2_common btbcm btintel videodev bluetooth media arc4 nls_iso8859_1 intel_rapl iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp msi_wmi sparse_keymap crct10dif_pclmul snd_hda_codec_realtek crc32_pclmul snd_hda_codec_hdmi snd_hda_codec_generic aesni_intel aes_x86_64 mac80211 lrw gf128mul glue_helper ablk_helper
[  458.091575]  cryptd snd_hda_intel input_leds snd_hda_codec iwlwifi snd_hda_core snd_hwdep joydev snd_seq_midi snd_seq_midi_event serio_raw snd_pcm snd_rawmidi snd_seq snd_seq_device snd_timer lpc_ich cfg80211 mei_me snd mei soundcore ie31200_edac shpchp edac_core mac_hid kvm_intel kvm irqbypass parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq dm_mirror dm_region_hash dm_log bcache hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse drm ahci alx libahci mdio wmi video fjes
[  458.091711] CPU: 1 PID: 5615 Comm: debconf-set-sel Not tainted 4.4.0-040400-generic #201601101930
[  458.091731] Hardware name: Micro-Star International Co., Ltd. GS60 2PE Ghost Pro/MS-16H2, BIOS E16H2IMS.112 05/05/2015
[  458.091755] task: ffff8803e1013700 ti: ffff8803e8d38000 task.ti: ffff8803e8d38000
[  458.091771] RIP: 0010:[<ffffffffc0346fac>]  [<ffffffffc0346fac>] btrfs_sync_file+0xcc/0x350 [btrfs]
[  458.091804] RSP: 0018:ffff8803e8d3be48  EFLAGS: 00010246
[  458.091815] RAX: ffff8803e1013700 RBX: ffff8803af242700 RCX: 0000000000000000
[  458.091831] RDX: 0000000080000000 RSI: 0000000000000000 RDI: ffff880409d9c988
[  458.091846] RBP: ffff8803e8d3bec8 R08: 0000000000000001 R09: 00000000021f5338
[  458.091861] R10: 000000000000009c R11: 0000000000000246 R12: ffff880409d9c988
[  458.091876] R13: ffff880409d9c8e0 R14: 0000000000000000 R15: 0000000000000000
[  458.091892] FS:  00007f31a0444700(0000) GS:ffff88041fa40000(0000) knlGS:0000000000000000
[  458.091910] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  458.091922] CR2: 0000000000000334 CR3: 00000003e8f05000 CR4: 00000000001406e0
[  458.091937] Stack:
[  458.091942]  00000000027bf270 0000000100000000 8000000000000000 ffff8803bbc02540
[  458.091960]  7fffffffffffffff 0000000000000000 0000000000000000 0000000000000000
[  458.091978]  0000000000000000 0000000092eff2d8 0000000092eff2d8 ffff8803af242700
[  458.091995] Call Trace:
[  458.092006]  [<ffffffff812395fb>] vfs_fsync_range+0x4b/0xb0
[  458.092019]  [<ffffffff812396bd>] do_fsync+0x3d/0x70
[  458.092030]  [<ffffffff81239950>] SyS_fsync+0x10/0x20
[  458.092043]  [<ffffffff817fd9b6>] entry_SYSCALL_64_fastpath+0x16/0x75
[  458.092057] Code: 8b 0e 48 85 c9 75 e8 eb 9e 48 8b 45 a0 4c 8b 75 a8 4d 8d a5 a8 00 00 00 4c 89 e7 4c 29 f0 48 83 c0 01 48 89 45 90 e8 d4 48 4b c1 <f0> 41 ff 87 34 03 00 00 49 8b 85 70 ff ff ff 48 c1 e8 07 83 e0 
[  458.092132] RIP  [<ffffffffc0346fac>] btrfs_sync_file+0xcc/0x350 [btrfs]
[  458.092155]  RSP <ffff8803e8d3be48>
[  458.092163] CR2: 0000000000000334
[  458.097834] ---[ end trace ff869f7e0dc1efc8 ]---
[  467.516336] general protection fault: 0000 [#2] SMP 
[  467.516353] Modules linked in: overlay drbg ansi_cprng ctr ccm rfcomm nvram msr xt_multiport ipt_REJECT nf_reject_ipv4 ebtable_filter ebtables ip6table_filter ip6_tables xt_addrtype xt_conntrack xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables binfmt_misc bnep uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core btusb btrtl v4l2_common btbcm btintel videodev bluetooth media arc4 nls_iso8859_1 intel_rapl iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp msi_wmi sparse_keymap crct10dif_pclmul snd_hda_codec_realtek crc32_pclmul snd_hda_codec_hdmi snd_hda_codec_generic aesni_intel aes_x86_64 mac80211 lrw gf128mul glue_helper ablk_helper
[  467.516558]  cryptd snd_hda_intel input_leds snd_hda_codec iwlwifi snd_hda_core snd_hwdep joydev snd_seq_midi snd_seq_midi_event serio_raw snd_pcm snd_rawmidi snd_seq snd_seq_device snd_timer lpc_ich cfg80211 mei_me snd mei soundcore ie31200_edac shpchp edac_core mac_hid kvm_intel kvm irqbypass parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq dm_mirror dm_region_hash dm_log bcache hid_generic usbhid hid i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse drm ahci alx libahci mdio wmi video fjes
[  467.516701] CPU: 5 PID: 5755 Comm: debconf-set-sel Tainted: G      D         4.4.0-040400-generic #201601101930
[  467.516724] Hardware name: Micro-Star International Co., Ltd. GS60 2PE Ghost Pro/MS-16H2, BIOS E16H2IMS.112 05/05/2015
[  467.516749] task: ffff8803d1cd0000 ti: ffff8803c9a0c000 task.ti: ffff8803c9a0c000
[  467.516766] RIP: 0010:[<ffffffffc0346fac>]  [<ffffffffc0346fac>] btrfs_sync_file+0xcc/0x350 [btrfs]
[  467.516801] RSP: 0018:ffff8803c9a0fe48  EFLAGS: 00010246
[  467.516813] RAX: ffff8803d1cd0000 RBX: ffff8800be1cdd00 RCX: 0000000000000000
[  467.516829] RDX: 0000000080000000 RSI: 0000000000000000 RDI: ffff8800dabf40a8
[  467.516845] RBP: ffff8803c9a0fec8 R08: 0000000000000001 R09: 000000000248e338
[  467.516861] R10: 000000000000009c R11: 0000000000000246 R12: ffff8800dabf40a8
[  467.516877] R13: ffff8800dabf4000 R14: 0000000000000000 R15: 00801b4000801b40
[  467.516894] FS:  00007f072dc58700(0000) GS:ffff88041fb40000(0000) knlGS:0000000000000000
[  467.516913] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  467.516926] CR2: 0000000002a61048 CR3: 00000003c99e0000 CR4: 00000000001406e0
[  467.516942] Stack:
[  467.516947]  0000000002a571a0 0000000100000000 8000000000000000 ffff8800bc36a300
[  467.516966]  7fffffffffffffff 0000000000000000 0000000000000000 0000000000000000
[  467.516984]  0000000000000000 00000000a28e8641 00000000a28e8641 ffff8800be1cdd00
[  467.517003] Call Trace:
[  467.517012]  [<ffffffff812395fb>] vfs_fsync_range+0x4b/0xb0
[  467.517026]  [<ffffffff812396bd>] do_fsync+0x3d/0x70
[  467.517038]  [<ffffffff81239950>] SyS_fsync+0x10/0x20
[  467.517052]  [<ffffffff817fd9b6>] entry_SYSCALL_64_fastpath+0x16/0x75
[  467.517067] Code: 8b 0e 48 85 c9 75 e8 eb 9e 48 8b 45 a0 4c 8b 75 a8 4d 8d a5 a8 00 00 00 4c 89 e7 4c 29 f0 48 83 c0 01 48 89 45 90 e8 d4 48 4b c1 <f0> 41 ff 87 34 03 00 00 49 8b 85 70 ff ff ff 48 c1 e8 07 83 e0 
[  467.517143] RIP  [<ffffffffc0346fac>] btrfs_sync_file+0xcc/0x350 [btrfs]
[  467.518451]  RSP <ffff8803c9a0fe48>
[  467.519751] ---[ end trace ff869f7e0dc1efc9 ]---