Public bug reported:
`dmesg` shows
```
[ 2278.123945] BUG: unable to handle kernel NULL pointer dereference at
0000000000000030
[ 2278.123990] IP: iput+0xd8/0x230
[ 2278.124002] PGD 0
[ 2278.124018] Oops: 0000 [#1] SMP
[ 2278.124031] Modules linked in: msr rfcomm xt_CHECKSUM iptable_mangle
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat libcrc32c
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT
nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter
ip6_tables snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic
snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_timer snd
soundcore iptable_filter pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE)
vboxdrv(OE) bbswitch(OE) bnep cdc_ether usbnet r8152 rtsx_usb_ms memstick btusb
btrtl btbcm btintel bluetooth binfmt_misc uvcvideo videobuf2_vmalloc
videobuf2_memops videobuf2_v4l2 videobuf2_core videodev media hid_multitouch
zfs(POE) zunicode(POE) zavl(POE) icp(POE) nls_iso8859_1 zcommon(POE)
[ 2278.124258] znvpair(POE) spl(OE) intel_rapl x86_pkg_temp_thermal
intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul
ghash_clmulni_intel pcbc aesni_intel aes_x86_64 arc4 crypto_simd glue_helper
cryptd intel_cstate intel_rapl_perf iwldvm mac80211 input_leds joydev iwlwifi
serio_raw cfg80211 ideapad_laptop sparse_keymap wmi mei_me mac_hid mei shpchp
lpc_ich ib_iser rdma_cm iw_cm ib_cm ib_core configfs iscsi_tcp libiscsi_tcp
libiscsi scsi_transport_iscsi coda parport_pc sunrpc ppdev lp parport ip_tables
x_tables autofs4 btrfs xor raid6_pq usb_storage rtsx_usb_sdmmc rtsx_usb
hid_generic usbhid hid psmouse r8169 mii i915 fjes video i2c_algo_bit
drm_kms_helper ahci syscopyarea libahci sysfillrect sysimgblt fb_sys_fops drm
[ 2278.124475] CPU: 6 PID: 19534 Comm: firefox Tainted: P OE
4.10.0-21-generic #23-Ubuntu
[ 2278.124503] Hardware name: LENOVO 20221/INVALID, BIOS 71CN51WW(V1.21)
07/12/2013
[ 2278.124528] task: ffff9e39bb841680 task.stack: ffffacb24849c000
[ 2278.124548] RIP: 0010:iput+0xd8/0x230
[ 2278.125802] RSP: 0000:ffffacb24849f840 EFLAGS: 00010246
[ 2278.127039] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
[ 2278.128275] RDX: 0000000000000003 RSI: ffff9e362381e080 RDI: ffff9e362381e080
[ 2278.129508] RBP: ffffacb24849f860 R08: 0000000000000101 R09: 0000000000000000
[ 2278.130748] R10: 0000000000045fc3 R11: 0000000000007c6a R12: ffff9e362381dff8
[ 2278.131983] R13: ffff9e362381e080 R14: ffff9e362381e150 R15: ffff9e366fd5b680
[ 2278.133204] FS: 00007f1de9068740(0000) GS:ffff9e3a3f380000(0000)
knlGS:0000000000000000
[ 2278.134427] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2278.135646] CR2: 0000000000000030 CR3: 000000035a11b000 CR4: 00000000001406e0
[ 2278.136954] Call Trace:
[ 2278.138173] dentry_unlink_inode+0xc1/0x160
[ 2278.139425] __dentry_kill+0xbe/0x160
[ 2278.140654] shrink_dentry_list+0x151/0x300
[ 2278.141857] prune_dcache_sb+0x5a/0x80
[ 2278.143013] super_cache_scan+0x118/0x1a0
[ 2278.144167] shrink_slab.part.40+0x1f5/0x420
[ 2278.145317] shrink_slab+0x29/0x30
[ 2278.146432] shrink_node+0x108/0x320
[ 2278.147522] do_try_to_free_pages+0xf5/0x330
[ 2278.148599] try_to_free_pages+0xe9/0x190
[ 2278.149658] __alloc_pages_slowpath+0x40f/0xba0
[ 2278.150714] __alloc_pages_nodemask+0x209/0x260
[ 2278.151769] alloc_pages_vma+0xab/0x250
[ 2278.152791] handle_mm_fault+0xe59/0x1360
[ 2278.153800] __do_page_fault+0x23e/0x4e0
[ 2278.154814] do_page_fault+0x22/0x30
[ 2278.155907] page_fault+0x28/0x30
[ 2278.156909] RIP: 0033:0x55e596b8f996
[ 2278.157875] RSP: 002b:00007ffc78bef880 EFLAGS: 00010283
[ 2278.158821] RAX: 00007f1d30d00000 RBX: 0000000004b58ca8 RCX: 0000000000bdaca8
[ 2278.159793] RDX: 000055e596d96280 RSI: 00007f1d42c7e000 RDI: 00007f1d34c7e000
[ 2278.160766] RBP: 0000000008000000 R08: 0000000000000000 R09: 000055e596d96248
[ 2278.161746] R10: 000055e596d96248 R11: 00007f1de7d03440 R12: 00007f1d3ed00000
[ 2278.162731] R13: 00007f1d30d00000 R14: 0000000004000000 R15: 00007f1dd3967000
[ 2278.163687] Code: 1d 2e 7c ce 00 48 85 db 74 18 48 8b 13 48 8b 7b 08 48 83
c3 18 4c 89 e6 ff d2 48 8b 13 48 85 d2 75 eb eb a1 49 8b 5c 24 28 a8 08 <4c> 8b
73 30 0f 85 1a 01 00 00 49 8b 46 20 48 85 c0 74 5b 4c 89
[ 2278.165683] RIP: iput+0xd8/0x230 RSP: ffffacb24849f840
[ 2278.166653] CR2: 0000000000000030
[ 2278.171736] ---[ end trace cf4a00bf24f77373 ]---
```
randomly after connecting USB devices directly or via a hub. Random USB
crashes occur more frequently than with Ubuntu 16.10, but less often
than with < 16.10.
This might be related to Firefox UI freezing and becoming unresponsive
(while the process state is sleeping and the `rtsx_usb_ms_1`
process/kernel thread is unresponsive constantly).
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: linux-image-4.10.0-21-generic 4.10.0-21.23
ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
AudioDevicesInUse:
BEN. PID ZUGR. BEFEHL
/dev/snd/controlC0: richter 17626 F.... pulseaudio
CurrentDesktop: Unity:Unity7
Date: Sun Jun 4 15:21:37 2017
HibernationDevice: RESUME=UUID=1bb0bb3e-8148-4957-9673-9701bd571c0a
InstallationDate: Installed on 2015-12-12 (540 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: LENOVO 20221
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-21-generic
root=UUID=791b47e7-915d-4d5a-bce0-d7e9b660a2ab ro
rootflags=subvol=ubuntu-main-root
RelatedPackageVersions:
linux-restricted-modules-4.10.0-21-generic N/A
linux-backports-modules-4.10.0-21-generic N/A
linux-firmware 1.164.1
SourcePackage: linux
UpgradeStatus: Upgraded to zesty on 2017-05-01 (34 days ago)
dmi.bios.date: 07/12/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 71CN51WW(V1.21)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 31900003WIN8 STD MLT
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Z500 Touch
dmi.modalias:
dmi:bvnLENOVO:bvr71CN51WW(V1.21):bd07/12/2013:svnLENOVO:pn20221:pvrLenovoIdeaPadZ500Touch:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadZ500Touch:
dmi.product.name: 20221
dmi.product.version: Lenovo IdeaPad Z500 Touch
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: amd64 apport-bug zesty
--
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https://bugs.launchpad.net/bugs/1695737
Title:
BUG: unable to handle kernel NULL pointer dereference at
0000000000000030
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