Public bug reported:

Hi,
I see this issues since 4.15.0-32-generic, but I have this particular smb/cifs 
setup for only a few weeks now, so it might after all by chance that I started 
to see it with this particular kernel.

It seems that about any activity in regard to a mount that I had working
for a few days - mounted on monday, played music from it most of each
day, today is thursday - triggers this fault now.

- tab completion into the dir
- ls in target dir
- umount the mountpoint

Sometimes the tools do not immediately crash, but hang.
In that case they are on wchan "wait_for_response.isra.9"

The logs on the NAS (Synology DS418+) have no entries, the last is me mounting 
it via smb/cifs.
Related FSTab entries are not too unusual other than making sure we have the 
new safer version of the protocol used:
  //10.7.0.231/music     /mnt/nas/music cifs user,noauto,user=paelzer,vers=3.0 
0 0


[53959.591519] general protection fault: 0000 [#6] SMP PTI
[53959.591522] Modules linked in: md4 nls_utf8 cifs ccm fscache ebtable_broute 
rfcomm ebtable_nat vmnet(OE) parport_pc vmw_vsock_vmci_transport vsock vmw_vmci 
vmmon(OE) scsi_transport_iscsi veth nbd ip6table_nat xt_comment unix_diag 
xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat 
xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter 
ebtables ip6table_filter ip6_tables devlink iptable_filter ipmi_devintf 
ipmi_msghandler openvswitch nsh nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 
nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_nat nf_conntrack cmac bnep 
binfmt_misc zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO) znvpair(PO) 
spl(O) nls_iso8859_1 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp 
kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul
[53959.591567]  ghash_clmulni_intel intel_cstate intel_rapl_perf serio_raw 
wmi_bmof snd_hda_codec_realtek snd_hda_codec_generic arc4 snd_hda_codec_hdmi 
snd_hda_intel snd_hda_codec snd_hda_core snd_usb_audio snd_usbmidi_lib uvcvideo 
snd_hwdep videobuf2_vmalloc snd_pcm videobuf2_memops hid_multitouch 
videobuf2_v4l2 videobuf2_core joydev iwlmvm btusb input_leds btrtl mac80211 
videodev snd_seq_midi btbcm btintel snd_seq_midi_event media bluetooth iwlwifi 
ecdh_generic snd_rawmidi cfg80211 snd_seq snd_seq_device thinkpad_acpi nvram 
mei_me snd_timer snd mei mac_hid soundcore shpchp lpc_ich intel_pch_thermal 
sch_fq_codel ppdev nfsd auth_rpcgss nfs_acl lockd grace sunrpc lp parport 
ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor raid6_pq
[53959.591612]  libcrc32c raid1 raid0 multipath linear hid_generic usbhid hid 
aesni_intel i915 i2c_algo_bit aes_x86_64 drm_kms_helper crypto_simd cryptd 
glue_helper e1000e syscopyarea sysfillrect psmouse ptp sysimgblt fb_sys_fops 
pps_core drm ahci libahci wmi video [last unloaded: parport_pc]
[53959.591632] CPU: 3 PID: 24492 Comm: umount Tainted: P      D    OE    
4.15.0-32-generic #35-Ubuntu
[53959.591634] Hardware name: LENOVO 20BSCTO1WW/20BSCTO1WW, BIOS N14ET31W (1.09 
) 06/26/2015
[53959.591639] RIP: 0010:kmem_cache_alloc+0x81/0x1b0
[53959.591641] RSP: 0018:ffffb743c94138c8 EFLAGS: 00010202
[53959.591643] RAX: 217dd9f6c3be9c25 RBX: 217dd9f6c3be9c25 RCX: 000000000000033b
[53959.591645] RDX: 000000000000033a RSI: 0000000001011200 RDI: 000000000002b550
[53959.591646] RBP: ffffb743c94138f8 R08: ffff9e848dceb550 R09: 0000000000000000
[53959.591648] R10: ffffb743c9413b20 R11: 0000000000000000 R12: 0000000001011200
[53959.591649] R13: ffff9e84838e3680 R14: 217dd9f6c3be9c25 R15: ffff9e84838e3680
[53959.591651] FS:  00007f77735cf080(0000) GS:ffff9e848dcc0000(0000) 
knlGS:0000000000000000
[53959.591653] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[53959.591655] CR2: 00007f77731c3050 CR3: 000000023f8b0001 CR4: 00000000003606e0
[53959.591656] Call Trace:
[53959.591663]  ? mempool_alloc_slab+0x15/0x20
[53959.591668]  ? wait_woken+0x80/0x80
[53959.591671]  mempool_alloc_slab+0x15/0x20
[53959.591673]  mempool_alloc+0x71/0x190
[53959.591676]  ? memcg_kmem_charge_memcg+0x7d/0xb0
[53959.591694]  cifs_small_buf_get+0x1a/0x30 [cifs]
[53959.591708]  small_smb2_init+0x62/0xb0 [cifs]
[53959.591720]  SMB2_open+0xc3/0xb50 [cifs]
[53959.591732]  ? cifsConvertToUTF16+0x1e9/0x420 [cifs]
[53959.591734]  ? __kmalloc+0x19b/0x220
[53959.591744]  ? cifs_strndup_to_utf16+0xbd/0x110 [cifs]
[53959.591756]  smb2_open_op_close+0xad/0x220 [cifs]
[53959.591766]  ? smb2_open_op_close+0xad/0x220 [cifs]
[53959.591769]  ? alloc_pages_current+0x6a/0xe0
[53959.591779]  smb2_query_path_info+0x74/0xf0 [cifs]
[53959.591791]  cifs_get_inode_info+0x4eb/0xab0 [cifs]
[53959.591801]  ? build_path_from_dentry_optional_prefix+0x103/0x3e0 [cifs]
[53959.591812]  cifs_revalidate_dentry_attr+0x1d8/0x250 [cifs]
[53959.591822]  cifs_getattr+0x5d/0x1a0 [cifs]
[53959.591826]  ? common_perm_cond+0x4c/0x70
[53959.591829]  vfs_getattr_nosec+0x73/0x90
[53959.591831]  vfs_getattr+0x36/0x40
[53959.591834]  vfs_statx+0x8d/0xe0
[53959.591837]  SYSC_newfstatat+0x35/0x70
[53959.591840]  SyS_newfstatat+0xe/0x10
[53959.591843]  do_syscall_64+0x73/0x130
[53959.591847]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[53959.591849] RIP: 0033:0x7f7772eb5929
[53959.591851] RSP: 002b:00007ffe8488c9f8 EFLAGS: 00000246 ORIG_RAX: 
0000000000000106
[53959.591853] RAX: ffffffffffffffda RBX: 0000564c6532cb00 RCX: 00007f7772eb5929
[53959.591854] RDX: 00007ffe8488cab0 RSI: 0000564c6532cce0 RDI: 00000000ffffffff
[53959.591856] RBP: 0000000000000000 R08: 0000000000000800 R09: 0000000000000000
[53959.591857] R10: 0000000000000800 R11: 0000000000000246 R12: 0000564c6532cce0
[53959.591859] R13: 0000000000000001 R14: 00000000ffffffff R15: 0000000000000000
[53959.591861] Code: 8c 9c 58 49 83 78 10 00 4d 8b 30 0f 84 00 01 00 00 4d 85 
f6 0f 84 f7 00 00 00 49 63 5f 20 49 8b 3f 48 8d 4a 01 4c 89 f0 4c 01 f3 <48> 33 
1b 49 33 9f 40 01 00 00 65 48 0f c7 0f 0f 94 c0 84 c0 74 
[53959.591895] RIP: kmem_cache_alloc+0x81/0x1b0 RSP: ffffb743c94138c8
[53959.591898] ---[ end trace d81409578ae7a47f ]---


alloc in such traces is always suspicious for OOM cases.
But there is plenty left (and most in cache as usual).

$ cat /proc/meminfo 
MemTotal:        7934876 kB
MemFree:          294440 kB
MemAvailable:    1717624 kB
Buffers:          509724 kB
Cached:          1973804 kB
SwapCached:        24156 kB
Active:          4918912 kB
Inactive:        1800720 kB
Active(anon):    4087284 kB
Inactive(anon):  1124812 kB
Active(file):     831628 kB
Inactive(file):   675908 kB
Unevictable:       24436 kB
Mlocked:           24452 kB
SwapTotal:       8286204 kB
SwapFree:        7928316 kB
Dirty:              1524 kB
Writeback:             0 kB
AnonPages:       4246216 kB
Mapped:           854556 kB
Shmem:            956696 kB
Slab:             553472 kB
SReclaimable:     222484 kB
SUnreclaim:       330988 kB
KernelStack:       25440 kB
PageTables:       130860 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    12253640 kB
Committed_AS:   20731464 kB
VmallocTotal:   34359738367 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
ShmemHugePages:        0 kB
ShmemPmdMapped:        0 kB
CmaTotal:              0 kB
CmaFree:               0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:      730148 kB
DirectMap2M:     7557120 kB
DirectMap1G:     1048576 kB


$ sudo cat /proc/slabinfo 
slabinfo - version: 2.1
# name            <active_objs> <num_objs> <objsize> <objperslab> 
<pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata 
<active_slabs> <num_slabs> <sharedavail>
cifs_request          13     16  16576    1    8 : tunables    0    0    0 : 
slabdata     16     16      0
cifs_inode_cache     273    273    776   21    4 : tunables    0    0    0 : 
slabdata     13     13      0
fscache_cookie_jar    138    138     88   46    1 : tunables    0    0    0 : 
slabdata      3      3      0
sw_flow                0      0   1696   19    8 : tunables    0    0    0 : 
slabdata      0      0      0
nf_conntrack         801    825    320   25    2 : tunables    0    0    0 : 
slabdata     33     33      0
zfs_znode_cache        0      0   1064   30    8 : tunables    0    0    0 : 
slabdata      0      0      0
dmu_buf_impl_t         0      0    304   26    2 : tunables    0    0    0 : 
slabdata      0      0      0
sa_cache               0      0    248   33    2 : tunables    0    0    0 : 
slabdata      0      0      0
zio_buf_14336         12     12  16384    2    8 : tunables    0    0    0 : 
slabdata      6      6      0
zio_buf_10240          0      0  12288    2    8 : tunables    0    0    0 : 
slabdata      0      0      0
zio_buf_3584           0      0   3584    9    8 : tunables    0    0    0 : 
slabdata      0      0      0
zio_buf_3072           0      0   3072   10    8 : tunables    0    0    0 : 
slabdata      0      0      0
zio_buf_2560           0      0   2560   12    8 : tunables    0    0    0 : 
slabdata      0      0      0
zio_buf_1536           0      0   1536   21    8 : tunables    0    0    0 : 
slabdata      0      0      0
zio_cache             56     56   1168   28    8 : tunables    0    0    0 : 
slabdata      2      2      0
kvm_async_pf           0      0    136   30    1 : tunables    0    0    0 : 
slabdata      0      0      0
kvm_vcpu               0      0  23424    1    8 : tunables    0    0    0 : 
slabdata      0      0      0
kvm_mmu_page_header      0      0    168   24    1 : tunables    0    0    0 : 
slabdata      0      0      0
pte_list_desc          0      0     32  128    1 : tunables    0    0    0 : 
slabdata      0      0      0
nfsd4_stateids         0      0    168   24    1 : tunables    0    0    0 : 
slabdata      0      0      0
nfsd4_files            0      0    288   28    2 : tunables    0    0    0 : 
slabdata      0      0      0
nfsd4_lockowners       0      0    392   20    2 : tunables    0    0    0 : 
slabdata      0      0      0
nfsd4_openowners       0      0    432   37    4 : tunables    0    0    0 : 
slabdata      0      0      0
rpc_inode_cache       23     23    704   23    4 : tunables    0    0    0 : 
slabdata      1      1      0
ext4_groupinfo_4k   1848   1848    144   28    1 : tunables    0    0    0 : 
slabdata     66     66      0
btrfs_delayed_ref_head      0      0    152   26    1 : tunables    0    0    0 
: slabdata      0      0      0
btrfs_delayed_node      0      0    296   27    2 : tunables    0    0    0 : 
slabdata      0      0      0
btrfs_ordered_extent      0      0    416   39    4 : tunables    0    0    0 : 
slabdata      0      0      0
btrfs_extent_map       0      0    144   28    1 : tunables    0    0    0 : 
slabdata      0      0      0
btrfs_extent_buffer      0      0    280   29    2 : tunables    0    0    0 : 
slabdata      0      0      0
btrfs_path             0      0    112   36    1 : tunables    0    0    0 : 
slabdata      0      0      0
btrfs_trans_handle      0      0    120   34    1 : tunables    0    0    0 : 
slabdata      0      0      0
btrfs_inode            0      0   1136   28    8 : tunables    0    0    0 : 
slabdata      0      0      0
drm_i915_gem_request    140    140    576   28    4 : tunables    0    0    0 : 
slabdata      5      5      0
i915_vma            3976   4945    704   23    4 : tunables    0    0    0 : 
slabdata    215    215      0
drm_i915_gem_object   3269   3906    768   21    4 : tunables    0    0    0 : 
slabdata    186    186      0
RAWv6                280    280   1152   28    8 : tunables    0    0    0 : 
slabdata     10     10      0
UDPv6                130    130   1216   26    8 : tunables    0    0    0 : 
slabdata      5      5      0
tw_sock_TCPv6          0      0    240   34    2 : tunables    0    0    0 : 
slabdata      0      0      0
request_sock_TCPv6      0      0    304   26    2 : tunables    0    0    0 : 
slabdata      0      0      0
TCPv6                 75     75   2176   15    8 : tunables    0    0    0 : 
slabdata      5      5      0
kcopyd_job             0      0   3312    9    8 : tunables    0    0    0 : 
slabdata      0      0      0
dm_uevent              0      0   2632   12    8 : tunables    0    0    0 : 
slabdata      0      0      0
cfq_io_cq            612    612    120   34    1 : tunables    0    0    0 : 
slabdata     18     18      0
cfq_queue            612    612    240   34    2 : tunables    0    0    0 : 
slabdata     18     18      0
bsg_cmd                0      0    216   37    2 : tunables    0    0    0 : 
slabdata      0      0      0
mqueue_inode_cache    170    170    960   34    8 : tunables    0    0    0 : 
slabdata      5      5      0
fuse_request          80     80    400   20    2 : tunables    0    0    0 : 
slabdata      4      4      0
fuse_inode           351    351    832   39    8 : tunables    0    0    0 : 
slabdata      9      9      0
ecryptfs_inode_cache      0      0   1024   32    8 : tunables    0    0    0 : 
slabdata      0      0      0
ecryptfs_auth_tok_list_item      0      0    832   39    8 : tunables    0    0 
   0 : slabdata      0      0      0
fat_inode_cache       88     88    744   22    4 : tunables    0    0    0 : 
slabdata      4      4      0
fat_cache              0      0     40  102    1 : tunables    0    0    0 : 
slabdata      0      0      0
squashfs_inode_cache    828    828    704   23    4 : tunables    0    0    0 : 
slabdata     36     36      0
jbd2_journal_head    720    884    120   34    1 : tunables    0    0    0 : 
slabdata     26     26      0
jbd2_revoke_table_s    256    256     16  256    1 : tunables    0    0    0 : 
slabdata      1      1      0
ext4_inode_cache   40138  58608   1088   30    8 : tunables    0    0    0 : 
slabdata   2049   2049      0
ext4_allocation_context    128    128    128   32    1 : tunables    0    0    
0 : slabdata      4      4      0
ext4_io_end         1088   1088     64   64    1 : tunables    0    0    0 : 
slabdata     17     17      0
ext4_extent_status   7344   7344     40  102    1 : tunables    0    0    0 : 
slabdata     72     72      0
mbcache             3212   3212     56   73    1 : tunables    0    0    0 : 
slabdata     44     44      0
fscrypt_info        3712   3840     32  128    1 : tunables    0    0    0 : 
slabdata     30     30      0
fscrypt_ctx          340    340     48   85    1 : tunables    0    0    0 : 
slabdata      4      4      0
userfaultfd_ctx_cache      0      0    192   21    1 : tunables    0    0    0 
: slabdata      0      0      0
dio                   25     25    640   25    4 : tunables    0    0    0 : 
slabdata      1      1      0
pid_namespace        156    156    208   39    2 : tunables    0    0    0 : 
slabdata      4      4      0
posix_timers_cache    140    140    232   35    2 : tunables    0    0    0 : 
slabdata      4      4      0
ip4-frags             23     23    176   23    1 : tunables    0    0    0 : 
slabdata      1      1      0
xfrm_dst_cache       144    144    448   36    4 : tunables    0    0    0 : 
slabdata      4      4      0
RAW                  340    340    960   34    8 : tunables    0    0    0 : 
slabdata     10     10      0
tw_sock_TCP          136    136    240   34    2 : tunables    0    0    0 : 
slabdata      4      4      0
request_sock_TCP     104    104    304   26    2 : tunables    0    0    0 : 
slabdata      4      4      0
TCP                  240    240   2048   16    8 : tunables    0    0    0 : 
slabdata     15     15      0
hugetlbfs_inode_cache    208    208    624   26    4 : tunables    0    0    0 
: slabdata      8      8      0
dquot                128    128    256   32    2 : tunables    0    0    0 : 
slabdata      4      4      0
eventpoll_pwq      13160  13160     72   56    1 : tunables    0    0    0 : 
slabdata    235    235      0
eventpoll_epi       9952   9952    128   32    1 : tunables    0    0    0 : 
slabdata    311    311      0
dax_cache             21     21    768   21    4 : tunables    0    0    0 : 
slabdata      1      1      0
request_queue        105    105   2128   15    8 : tunables    0    0    0 : 
slabdata      7      7      0
dmaengine-unmap-256     15     15   2112   15    8 : tunables    0    0    0 : 
slabdata      1      1      0
dmaengine-unmap-128     30     30   1088   30    8 : tunables    0    0    0 : 
slabdata      1      1      0
sock_inode_cache   12621  12788    704   23    4 : tunables    0    0    0 : 
slabdata    556    556      0
file_lock_cache      240    240    200   20    1 : tunables    0    0    0 : 
slabdata     12     12      0
net_namespace         30     30   6080    5    8 : tunables    0    0    0 : 
slabdata      6      6      0
shmem_inode_cache  12409  13570    712   23    4 : tunables    0    0    0 : 
slabdata    590    590      0
taskstats             96     96    328   24    2 : tunables    0    0    0 : 
slabdata      4      4      0
proc_inode_cache   25116  27144    680   24    4 : tunables    0    0    0 : 
slabdata   1131   1131      0
sigqueue             100    100    160   25    1 : tunables    0    0    0 : 
slabdata      4      4      0
bdev_cache          1053   1053    832   39    8 : tunables    0    0    0 : 
slabdata     27     27      0
kernfs_node_cache 244159 248580    136   30    1 : tunables    0    0    0 : 
slabdata   8286   8286      0
mnt_cache           3380   3591    384   21    2 : tunables    0    0    0 : 
slabdata    171    171      0
filp               86621  92096    256   32    2 : tunables    0    0    0 : 
slabdata   2878   2878      0
inode_cache        58144  63674    608   26    4 : tunables    0    0    0 : 
slabdata   2449   2449      0
dentry            128393 154938    192   21    1 : tunables    0    0    0 : 
slabdata   7378   7378      0
iint_cache             0      0     80   51    1 : tunables    0    0    0 : 
slabdata      0      0      0
lsm_file_cache     22510  24140     24  170    1 : tunables    0    0    0 : 
slabdata    142    142      0
iint_cache             0      0     80   51    1 : tunables    0    0    0 : 
slabdata      0      0      0
buffer_head       189167 229203    104   39    1 : tunables    0    0    0 : 
slabdata   5877   5877      0
nsproxy              949    949     56   73    1 : tunables    0    0    0 : 
slabdata     13     13      0
vm_area_struct    188699 193518    208   39    2 : tunables    0    0    0 : 
slabdata   4962   4962      0
mm_struct           4815   4815   2112   15    8 : tunables    0    0    0 : 
slabdata    321    321      0
files_cache         5773   5773    704   23    4 : tunables    0    0    0 : 
slabdata    251    251      0
signal_cache        8512   8512   1024   32    8 : tunables    0    0    0 : 
slabdata    266    266      0
sighand_cache       4118   4170   2112   15    8 : tunables    0    0    0 : 
slabdata    278    278      0
task_struct         3548   3780   5824    5    8 : tunables    0    0    0 : 
slabdata    756    756      0
cred_jar           34948  35133    192   21    1 : tunables    0    0    0 : 
slabdata   1673   1673      0
anon_vma          110987 112884     88   46    1 : tunables    0    0    0 : 
slabdata   2454   2454      0
pid               206905 211584     64   64    1 : tunables    0    0    0 : 
slabdata   3306   3306      0
Acpi-Operand        5096   5096     72   56    1 : tunables    0    0    0 : 
slabdata     91     91      0
Acpi-ParseExt        624    624    104   39    1 : tunables    0    0    0 : 
slabdata     16     16      0
Acpi-State          1071   1071     80   51    1 : tunables    0    0    0 : 
slabdata     21     21      0
Acpi-Namespace      3162   3162     40  102    1 : tunables    0    0    0 : 
slabdata     31     31      0
numa_policy           31     31    264   31    2 : tunables    0    0    0 : 
slabdata      1      1      0
trace_event_file    2024   2024     88   46    1 : tunables    0    0    0 : 
slabdata     44     44      0
ftrace_event_field  13691  16915     48   85    1 : tunables    0    0    0 : 
slabdata    199    199      0
radix_tree_node    57401  65716    584   28    4 : tunables    0    0    0 : 
slabdata   2347   2347      0
task_group           784    784    576   28    4 : tunables    0    0    0 : 
slabdata     28     28      0
dma-kmalloc-8192       0      0   8192    4    8 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-4096       0      0   4096    8    8 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-2048       0      0   2048   16    8 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-1024       0      0   1024   32    8 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-512        0      0    512   32    4 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-256        0      0    256   32    2 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-128        0      0    128   32    1 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-64         0      0     64   64    1 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-32         0      0     32  128    1 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-16         0      0     16  256    1 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-8          0      0      8  512    1 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-192        0      0    192   21    1 : tunables    0    0    0 : 
slabdata      0      0      0
dma-kmalloc-96         0      0     96   42    1 : tunables    0    0    0 : 
slabdata      0      0      0
kmalloc-8192        1596   1668   8192    4    8 : tunables    0    0    0 : 
slabdata    417    417      0
kmalloc-4096        5617   5720   4096    8    8 : tunables    0    0    0 : 
slabdata    715    715      0
kmalloc-2048        8386   8896   2048   16    8 : tunables    0    0    0 : 
slabdata    556    556      0
kmalloc-1024       18827  19328   1024   32    8 : tunables    0    0    0 : 
slabdata    604    604      0
kmalloc-512        29505  30976    512   32    4 : tunables    0    0    0 : 
slabdata    968    968      0
kmalloc-256        22639  23264    256   32    2 : tunables    0    0    0 : 
slabdata    727    727      0
kmalloc-192        12353  12516    192   21    1 : tunables    0    0    0 : 
slabdata    596    596      0
kmalloc-128         9525   9952    128   32    1 : tunables    0    0    0 : 
slabdata    311    311      0
kmalloc-96         18957  19824     96   42    1 : tunables    0    0    0 : 
slabdata    472    472      0
kmalloc-64         77545  81088     64   64    1 : tunables    0    0    0 : 
slabdata   1267   1267      0
kmalloc-32        421615 425216     32  128    1 : tunables    0    0    0 : 
slabdata   3322   3322      0
kmalloc-16         45288  47104     16  256    1 : tunables    0    0    0 : 
slabdata    184    184      0
kmalloc-8          33792  33792      8  512    1 : tunables    0    0    0 : 
slabdata     66     66      0
kmem_cache_node     8810   9216     64   64    1 : tunables    0    0    0 : 
slabdata    144    144      0
kmem_cache          8717   9051    384   21    2 : tunables    0    0    0 : 
slabdata    431    431      0

For testing of mainline kernels and such, I'm not yet sure how reproducible 
this will be.
I hope it is a one-time issue, If it triggers again I'll report here to have a 
feeling about reproducibility, but for now we have to assume that I can't 
immediately trigger/test for it.
--- 
ProblemType: Bug
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  paelzer   18576 F.... pulseaudio
 /dev/snd/controlC3:  paelzer   18576 F.... pulseaudio
 /dev/snd/controlC2:  paelzer   18576 F.... pulseaudio
 /dev/snd/controlC1:  paelzer   18576 F.... pulseaudio
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=UUID=6470cb5b-b1c8-47f1-914f-9867c76b1266
InstallationDate: Installed on 2016-02-19 (908 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: LENOVO 20BSCTO1WW
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-32-generic 
root=UUID=7da7e070-6e58-4b1b-ad8b-11ddb9c46992 ro quiet splash 
crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M 
crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M 
crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M 
crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-2G:128M,2G-:256M 
crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-2G:128M,2G-:256M 
crashkernel=384M-2G:128M,2G-:256M crashkernel=384M-:128M crashkernel=384M-:128M 
crashkernel=384M-:128M vt.handoff=1
ProcVersionSignature: Ubuntu 4.15.0-32.35-generic 4.15.18
PulseList:
 Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
 No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-32-generic N/A
 linux-backports-modules-4.15.0-32-generic  N/A
 linux-firmware                             1.173.1
Tags:  bionic
Uname: Linux 4.15.0-32-generic x86_64
UpgradeStatus: Upgraded to bionic on 2018-05-03 (104 days ago)
UserGroups:
 
_MarkForUpload: True
dmi.bios.date: 06/26/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N14ET31W (1.09 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BSCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN14ET31W(1.09):bd06/26/2015:svnLENOVO:pn20BSCTO1WW:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BSCTO1WW:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad X1 Carbon 3rd
dmi.product.name: 20BSCTO1WW
dmi.product.version: ThinkPad X1 Carbon 3rd
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-collected bionic

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https://bugs.launchpad.net/bugs/1787328

Title:
  smb/cifs support triggers general protection fault

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