[LU-11785] conf-sanity test_98 fails with 'Buffer overflow check failed'

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.4
• Affects Version/s: Lustre 2.12.0, Lustre 2.13.0, Lustre 2.12.2, Lustre 2.12.3, Lustre 2.14.0, Lustre 2.12.4, Lustre 2.12.5, Lustre 2.15.0, Lustre 2.15.3
• Labels: arm ppc
• Severity: 3
• Assignee: Kevin Zhao
• Reporter: James Nunez (Inactive)

Description

conf-sanity test_98 fails with 'Buffer overflow check failed' since October 26, 2018. So far, this test is only failing with this error for ARM architecture testing.

Looking at the logs of a recent failure, https://testing.whamcloud.com/test_sets/f2d62dae-fdef-11e8-b837-52540065bddc , the last lines of test output in the client test_log are

Started lustre-OST0000
mount lustre on /mnt/lustre.....
Starting client: trevis-79vm11.trevis.whamcloud.com:  -o user_xattr,flock trevis-24vm4@tcp:/lustre /mnt/lustre
CMD: trevis-79vm11.trevis.whamcloud.com mkdir -p /mnt/lustre
CMD: trevis-79vm11.trevis.whamcloud.com mount -t lustre -o user_xattr,flock trevis-24vm4@tcp:/lustre /mnt/lustre
CMD: trevis-79vm11.trevis.whamcloud.com cp /etc/passwd /mnt/lustre/a
CMD: trevis-79vm11.trevis.whamcloud.com rm /mnt/lustre/a
CMD: trevis-79vm11.trevis.whamcloud.com grep /mnt/lustre' ' /proc/mounts > /dev/null
setup single mount lustre success
 conf-sanity test_98: @@@@@@ FAIL: Buffer overflow check failed

The test is fairly simple

7230 test_98()
7231 {
7232         local mountopt
7233         local temp=$MDS_MOUNT_OPTS
7234 
7235         setup
7236         check_mount || error "mount failed"
7237         mountopt="user_xattr"
7238         for ((x = 1; x <= 400; x++)); do
7239                 mountopt="$mountopt,user_xattr"
7240         done
7241         remount_client $mountopt $MOUNT  2>&1 | grep "too long" ||
7242                 error "Buffer overflow check failed"
7243         cleanup || error "cleanup failed"
7244 }
7245 run_test 98 "Buffer-overflow check while parsing mount_opts"

In the console log of client 1 (vm11), we see the long mount option

[45496.444538] Lustre: DEBUG MARKER: mount -t lustre -o remount,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xattr,user_xat
[45497.132159] Lustre: DEBUG MARKER: /usr/sbin/lctl mark  conf-sanity test_98: @@@@@@ FAIL: Buffer overflow check failed 

but there are no obvious errors in the console logs.

Logs for other failures are at
https://testing.whamcloud.com/test_sets/8ca4b49e-d9d0-11e8-b46b-52540065bddc
https://testing.whamcloud.com/test_sets/876f284e-df5f-11e8-a871-52540065bddc
https://testing.whamcloud.com/test_sets/e7d91f16-f7a9-11e8-86c0-52540065bddc

Issue Links

• is related to: LU-10300 Can the Lustre 2.10.x clients support 64K kernel page?
• is related to: LU-7919 Buffer overflow in mount_lustre: parse_ldd(),append_option()