Public bug reported:
Hello,
My issue is that whenever I try to write new files (copy or move) to my file
server something in the samba client freezes and I can't do anything samba
until the system is rebooted.
To get write access I mount with uid ie "sudo mount //server/share
/mountpoint -o user=write,uid=1000". Using this command the server and
client negotiates smb protocol version 3.02.
When this happens the server is still happily serving files to other machines.
If I just read files everything works fine.
If I connect from a windows client there is no issue.
If I add "vers=1.0" everything works but transfers are really slow. Specifying
version 3 produces a fail.
Trying the same operation (different hw) with Mint 18 Mate produces the same
fault.
Trying the same operation (with "vers=3.0" set) using SuSE Leap 15.0 KDE live
everything works as expected.
Both client and server are running fully updated, as of posting, bionic.
Using 'dmesg -w' too see what's going on I can see that there is a
general protection fault somehow related to cifsd. I am however unable
to tell if it is relevant to my issue, from kern.log:
Jan 9 21:03:49 ubnu kernel: [ 410.357213] general protection fault: 0000 [#1]
SMP PTI
Jan 9 21:03:49 ubnu kernel: [ 410.357224] Modules linked in: cmac arc4 md4
nls_utf8 cifs ccm fscache rfcomm pci_stub vboxpci(OE) vboxnetadp(OE)
vboxnetflt(OE) vboxdrv(OE) thunderbolt bnep binfmt_misc nls_iso8859_1
snd_hda_codec_hdmi snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core snd_soc_sst_dsp
snd_soc_sst_ipc snd_hda_codec_realtek snd_soc_acpi snd_hda_codec_generic
snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine snd_hda_intel intel_rapl
btusb x86_pkg_temp_thermal intel_powerclamp btrtl coretemp joydev btbcm
snd_hda_codec kvm_intel input_leds kvm irqbypass btintel crct10dif_pclmul
crc32_pclmul snd_hda_core ghash_clmulni_intel pcbc snd_hwdep snd_pcm bluetooth
ecdh_generic snd_seq_midi snd_seq_midi_event aesni_intel snd_rawmidi aes_x86_64
crypto_simd glue_helper cryptd intel_cstate intel_rapl_perf snd_seq rtsx_pci_ms
snd_seq_device
Jan 9 21:03:49 ubnu kernel: [ 410.357357] wmi_bmof snd_timer memstick
intel_wmi_thunderbolt snd shpchp soundcore mei_me mei intel_pch_thermal
acpi_pad mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables
autofs4 xfs libcrc32c hid_generic usbhid hid rtsx_pci_sdmmc i915 e1000e
i2c_algo_bit drm_kms_helper ptp syscopyarea pps_core i2c_i801 sysfillrect
sysimgblt rtsx_pci fb_sys_fops drm ahci libahci wmi video
Jan 9 21:03:49 ubnu kernel: [ 410.357447] CPU: 2 PID: 1822 Comm: cifsd
Tainted: G OE 4.15.0-43-generic #46-Ubuntu
Jan 9 21:03:49 ubnu kernel: [ 410.357453] Hardware name: /NUC7i3BNB, BIOS
BNKBL357.86A.0069.2018.0920.1250 09/20/2018
Jan 9 21:03:49 ubnu kernel: [ 410.357468] RIP:
0010:prefetch_freepointer+0x15/0x30
Jan 9 21:03:49 ubnu kernel: [ 410.357474] RSP: 0018:ffffb16201ae3da0 EFLAGS:
00010282
Jan 9 21:03:49 ubnu kernel: [ 410.357482] RAX: 0000000000000000 RBX:
e90527c744fff71a RCX: 0000000000003ea9
Jan 9 21:03:49 ubnu kernel: [ 410.357488] RDX: 0000000000003ea8 RSI:
e90527c744fff71a RDI: ffff9d7079255080
Jan 9 21:03:49 ubnu kernel: [ 410.357494] RBP: ffffb16201ae3da0 R08:
ffff9d707ed2b650 R09: ffffb16201ae3db0
Jan 9 21:03:49 ubnu kernel: [ 410.357499] R10: ffffb16201ae3de8 R11:
0000000000000000 R12: 0000000001011200
Jan 9 21:03:49 ubnu kernel: [ 410.357505] R13: ffff9d7079255080 R14:
ffff9d7016478c40 R15: ffff9d7079255080
Jan 9 21:03:49 ubnu kernel: [ 410.357512] FS: 0000000000000000(0000)
GS:ffff9d707ed00000(0000) knlGS:0000000000000000
Jan 9 21:03:49 ubnu kernel: [ 410.357519] CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Jan 9 21:03:49 ubnu kernel: [ 410.357525] CR2: 00007f0a2802d028 CR3:
000000003760a006 CR4: 00000000003606e0
Jan 9 21:03:49 ubnu kernel: [ 410.357530] Call Trace:
Jan 9 21:03:49 ubnu kernel: [ 410.357545] kmem_cache_alloc+0xa2/0x1b0
Jan 9 21:03:49 ubnu kernel: [ 410.357558] ? mempool_alloc_slab+0x15/0x20
Jan 9 21:03:49 ubnu kernel: [ 410.357570] ? wait_woken+0x80/0x80
Jan 9 21:03:49 ubnu kernel: [ 410.357580] mempool_alloc_slab+0x15/0x20
Jan 9 21:03:49 ubnu kernel: [ 410.357590] mempool_alloc+0x71/0x190
Jan 9 21:03:49 ubnu kernel: [ 410.357660] ? smb2_add_credits+0xb0/0x250
[cifs]
Jan 9 21:03:49 ubnu kernel: [ 410.357709] cifs_small_buf_get+0x1a/0x30 [cifs]
Jan 9 21:03:49 ubnu kernel: [ 410.357751]
cifs_demultiplex_thread+0x5c7/0xaf0 [cifs]
Jan 9 21:03:49 ubnu kernel: [ 410.357762] ? __schedule+0x299/0x8a0
Jan 9 21:03:49 ubnu kernel: [ 410.357777] kthread+0x121/0x140
Jan 9 21:03:49 ubnu kernel: [ 410.357815] ? cifs_handle_standard+0x190/0x190
[cifs]
Jan 9 21:03:49 ubnu kernel: [ 410.357827] ?
kthread_create_worker_on_cpu+0x70/0x70
Jan 9 21:03:49 ubnu kernel: [ 410.357838] ? do_syscall_64+0x73/0x130
Jan 9 21:03:49 ubnu kernel: [ 410.357847] ? SyS_exit_group+0x14/0x20
Jan 9 21:03:49 ubnu kernel: [ 410.357859] ret_from_fork+0x35/0x40
Jan 9 21:03:49 ubnu kernel: [ 410.357866] Code: eb bb 49 8b 74 24 60 48 c7 c7
30 cd 0e a5 e8 93 b9 ea ff eb 90 90 0f 1f 44 00 00 55 48 85 f6 48 89 e5 74 14
48 63 47 20 48 01 c6 <48> 33 36 48 33 b7 40 01 00 00 0f 18 0e 5d c3 66 90 66 2e
0f 1f
Jan 9 21:03:49 ubnu kernel: [ 410.357991] RIP: prefetch_freepointer+0x15/0x30
RSP: ffffb16201ae3da0
Jan 9 21:03:49 ubnu kernel: [ 410.358063] ---[ end trace 9fca55019e520b64 ]---
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1811723
Title:
Samba client freeze during write when using higher than vers=1.0
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