[KUDU-2495] dist-test slave environment can no longer ptrace

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: n/a
• Fix Version/s: n/a
• Component/s: project-infra, test
• Assignee: Todd Lipcon
• Reporter: Adar Dembo
• Created: 11/Jul/18 00:02
• Updated: 02/Aug/18 04:53
• Resolved: 02/Aug/18 04:53

Description

Noticed this while debugging an unrelated failure. I'm guessing it's due to the VM upgrade in the dist-test environment? We should probably configure /proc/sys/kernel/yama/ptrace_scope in the host OS so that we can restore this functionality.

I0710 23:27:16.445466 18604 external_mini_cluster-itest-base.cc:86] Attempting to dump stacks of TS 0 with UUID 3576d2baa86141439f2e837433589a9b and pid 22014
************************ BEGIN STACKS **************************
Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
/tmp/dist-test-taskXw_ur6/build/debug/test-work/tablet_copy_client_session-itest/22014: No such file or directory.
No threads.
************************* END STACKS ***************************
I0710 23:27:16.608888 18604 external_mini_cluster-itest-base.cc:86] Attempting to dump stacks of TS 1 with UUID 6ec7d1737cd1460ab9dd752e64eac912 and pid 22413
************************ BEGIN STACKS **************************
Could not attach to process. If your uid matches the uid of the target
process, check the setting of /proc/sys/kernel/yama/ptrace_scope, or try
again as the root user. For more details, see /etc/sysctl.d/10-ptrace.conf
ptrace: Operation not permitted.
/tmp/dist-test-taskXw_ur6/build/debug/test-work/tablet_copy_client_session-itest/22413: No such file or directory.
No threads.
************************* END STACKS ***************************