Hi, have some news in this one. I've emailed Microsoft CIFS maintainers, they
recommended the following patch as a potential fix:
b98749cac4a6 ("CIFS: keep FileInfo handle live during oplock break").
There's a PPA with a kernel built including this patch, for those
interested in testing:
https://launchpad.net/~dragan-s/+archive/ubuntu/lp1795659 .
Cheers,
Guilherme
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https://bugs.launchpad.net/bugs/1795659
Title:
kernel panic using CIFS share smb2_push_mandatory_locks
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Confirmed
Bug description:
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Kernel: 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
Under load, getting a system crash when accessing files on an SMB3
share. dmesg from crash attached. I can upload the crash dump if
needed.
Share is mounted with the following options:
"ro,_netdev,username=*****,password=*****,domain=*****,vers=3.02,sec=ntlmsspi,nounix,noserverino,nobrl,cache=none"
Dmesg points to the cifs module
[ 2192.662345] BUG: unable to handle kernel NULL pointer dereference at
0000000000000038
[ 2192.662407] IP: smb2_push_mandatory_locks+0x10e/0x3b0 [cifs]
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