Samba client freeze during write
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,
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.
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_
Jan 9 21:03:49 ubnu kernel: [ 410.357357] wmi_bmof snd_timer memstick intel_wmi_
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.
Jan 9 21:03:49 ubnu kernel: [ 410.357468] RIP: 0010:prefetch_
Jan 9 21:03:49 ubnu kernel: [ 410.357474] RSP: 0018:ffffb16201
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: 000000000000000
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_
Jan 9 21:03:49 ubnu kernel: [ 410.357558] ? mempool_
Jan 9 21:03:49 ubnu kernel: [ 410.357570] ? wait_woken+
Jan 9 21:03:49 ubnu kernel: [ 410.357580] mempool_
Jan 9 21:03:49 ubnu kernel: [ 410.357590] mempool_
Jan 9 21:03:49 ubnu kernel: [ 410.357660] ? smb2_add_
Jan 9 21:03:49 ubnu kernel: [ 410.357709] cifs_small_
Jan 9 21:03:49 ubnu kernel: [ 410.357751] cifs_demultiple
Jan 9 21:03:49 ubnu kernel: [ 410.357762] ? __schedule+
Jan 9 21:03:49 ubnu kernel: [ 410.357777] kthread+0x121/0x140
Jan 9 21:03:49 ubnu kernel: [ 410.357815] ? cifs_handle_
Jan 9 21:03:49 ubnu kernel: [ 410.357827] ? kthread_
Jan 9 21:03:49 ubnu kernel: [ 410.357838] ? do_syscall_
Jan 9 21:03:49 ubnu kernel: [ 410.357847] ? SyS_exit_
Jan 9 21:03:49 ubnu kernel: [ 410.357859] ret_from_
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_
Jan 9 21:03:49 ubnu kernel: [ 410.358063] ---[ end trace 9fca55019e520b64 ]---
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