mirror of
https://github.com/opencontainers/runc.git
synced 2026-07-11 06:03:57 +08:00
Cédric Clerget
afc23e3397
This handles a corner case when joining a container having all the processes running exclusively on isolated CPU cores to force the kernel to schedule runc process on the first CPU core within the cgroups cpuset. The introduction of the kernel commit 46a87b3851f0d6eb05e6d83d5c5a30df0eca8f76 has affected this deterministic scheduling behavior by distributing tasks across CPU cores within the cgroups cpuset. Some intensive real-time application are relying on this deterministic behavior and use the first CPU core to run a slow thread while other CPU cores are fully used by real-time threads with SCHED_FIFO policy. Such applications prevents runc process from joining a container when the runc process is randomly scheduled on a CPU core owned by a real-time thread. Introduces isolated CPU affinity transition OCI runtime annotation org.opencontainers.runc.exec.isolated-cpu-affinity-transition to restore the behavior during runc exec. Fix issue with kernel >= 6.2 not resetting CPU affinity for container processes. Signed-off-by: Cédric Clerget <cedric.clerget@gmail.com>
479 lines
14 KiB
Bash
479 lines
14 KiB
Bash
#!/usr/bin/env bats
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load helpers
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function setup() {
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setup_busybox
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}
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function teardown() {
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teardown_bundle
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}
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@test "runc exec" {
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec test_busybox echo Hello from exec
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[ "$status" -eq 0 ]
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echo text echoed = "'""${output}""'"
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[[ "${output}" == *"Hello from exec"* ]]
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}
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@test "runc exec [exit codes]" {
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec test_busybox false
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[ "$status" -eq 1 ]
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runc exec test_busybox sh -c "exit 42"
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[ "$status" -eq 42 ]
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runc exec --pid-file /non-existent/directory test_busybox true
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[ "$status" -eq 255 ]
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runc exec test_busybox no-such-binary
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[ "$status" -eq 255 ]
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runc exec no_such_container true
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[ "$status" -eq 255 ]
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}
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@test "runc exec --pid-file" {
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec --pid-file pid.txt test_busybox echo Hello from exec
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[ "$status" -eq 0 ]
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echo text echoed = "'""${output}""'"
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[[ "${output}" == *"Hello from exec"* ]]
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# check pid.txt was generated
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[ -e pid.txt ]
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output=$(cat pid.txt)
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[[ "$output" =~ [0-9]+ ]]
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[[ "$output" != $(__runc state test_busybox | jq '.pid') ]]
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}
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@test "runc exec --pid-file with new CWD" {
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bundle="$(pwd)"
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# create pid_file directory as the CWD
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mkdir pid_file
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cd pid_file
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# run busybox detached
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runc run -d -b "$bundle" --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec --pid-file pid.txt test_busybox echo Hello from exec
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[ "$status" -eq 0 ]
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echo text echoed = "'""${output}""'"
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[[ "${output}" == *"Hello from exec"* ]]
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# check pid.txt was generated
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[ -e pid.txt ]
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output=$(cat pid.txt)
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[[ "$output" =~ [0-9]+ ]]
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[[ "$output" != $(__runc state test_busybox | jq '.pid') ]]
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}
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@test "runc exec ls -la" {
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec test_busybox ls -la
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[ "$status" -eq 0 ]
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[[ ${lines[0]} == *"total"* ]]
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[[ ${lines[1]} == *"."* ]]
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[[ ${lines[2]} == *".."* ]]
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}
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@test "runc exec ls -la with --cwd" {
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec --cwd /bin test_busybox pwd
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[ "$status" -eq 0 ]
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[[ ${output} == "/bin"* ]]
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}
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@test "runc exec --env" {
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec --env RUNC_EXEC_TEST=true test_busybox env
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[ "$status" -eq 0 ]
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[[ ${output} == *"RUNC_EXEC_TEST=true"* ]]
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}
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@test "runc exec --user" {
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# --user can't work in rootless containers that don't have idmap.
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[ $EUID -ne 0 ] && requires rootless_idmap
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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runc exec --user 1000:1000 test_busybox id
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[ "$status" -eq 0 ]
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[[ "${output}" == "uid=1000 gid=1000"* ]]
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}
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# https://github.com/opencontainers/runc/issues/3674.
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@test "runc exec --user vs /dev/null ownership" {
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requires root
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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ls -l /dev/null
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__runc exec -d --user 1000:1000 test_busybox id </dev/null
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ls -l /dev/null
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UG=$(stat -c %u:%g /dev/null)
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# Host's /dev/null must be owned by root.
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[ "$UG" = "0:0" ]
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}
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@test "runc exec --additional-gids" {
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requires root
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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wait_for_container 15 1 test_busybox
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runc exec --user 1000:1000 --additional-gids 100 --additional-gids 65534 test_busybox id -G
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[ "$status" -eq 0 ]
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[ "$output" = "1000 100 65534" ]
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}
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@test "runc exec --preserve-fds" {
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# run busybox detached
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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[ "$status" -eq 0 ]
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echo hello >preserve-fds.test
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# fd 3 is used by bats, so we use 4
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exec 4<preserve-fds.test
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runc exec --preserve-fds=2 test_busybox cat /proc/self/fd/4
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[ "$status" -eq 0 ]
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[ "${output}" = "hello" ]
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}
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function check_exec_debug() {
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[[ "$*" == *"nsexec container setup"* ]]
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[[ "$*" == *"child process in init()"* ]]
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[[ "$*" == *"setns_init: about to exec"* ]]
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}
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@test "runc --debug exec" {
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runc run -d --console-socket "$CONSOLE_SOCKET" test
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[ "$status" -eq 0 ]
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runc --debug exec test true
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[ "$status" -eq 0 ]
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[[ "${output}" == *"level=debug"* ]]
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check_exec_debug "$output"
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}
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@test "runc --debug --log exec" {
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runc run -d --console-socket "$CONSOLE_SOCKET" test
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[ "$status" -eq 0 ]
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runc --debug --log log.out exec test true
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# check output does not include debug info
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[[ "${output}" != *"level=debug"* ]]
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cat log.out >&2
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# check expected debug output was sent to log.out
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output=$(cat log.out)
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[[ "${output}" == *"level=debug"* ]]
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check_exec_debug "$output"
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}
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@test "runc exec --cgroup sub-cgroups [v1]" {
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requires root cgroups_v1
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set_cgroups_path
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set_cgroup_mount_writable
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__runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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testcontainer test_busybox running
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# Check we can't join parent cgroup.
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runc exec --cgroup ".." test_busybox cat /proc/self/cgroup
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[ "$status" -ne 0 ]
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[[ "$output" == *" .. is not a sub cgroup path"* ]]
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# Check we can't join non-existing subcgroup.
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runc exec --cgroup nonexistent test_busybox cat /proc/self/cgroup
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[ "$status" -ne 0 ]
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[[ "$output" == *" adding pid "*"/nonexistent/cgroup.procs: no such file "* ]]
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# Check we can't join non-existing subcgroup (for a particular controller).
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runc exec --cgroup cpu:nonexistent test_busybox cat /proc/self/cgroup
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[ "$status" -ne 0 ]
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[[ "$output" == *" adding pid "*"/nonexistent/cgroup.procs: no such file "* ]]
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# Check we can't specify non-existent controller.
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runc exec --cgroup whaaat:/ test_busybox true
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[ "$status" -ne 0 ]
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[[ "$output" == *"unknown controller "* ]]
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# Check we can join top-level cgroup (implicit).
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runc exec test_busybox cat /proc/self/cgroup
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[ "$status" -eq 0 ]
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run ! grep -v ":$REL_CGROUPS_PATH\$" <<<"$output"
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# Check we can join top-level cgroup (explicit).
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runc exec --cgroup / test_busybox cat /proc/self/cgroup
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[ "$status" -eq 0 ]
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run ! grep -v ":$REL_CGROUPS_PATH\$" <<<"$output"
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# Create a few subcgroups.
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# Note that cpu,cpuacct may be mounted together or separate.
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runc exec test_busybox sh -euc "mkdir -p /sys/fs/cgroup/memory/submem /sys/fs/cgroup/cpu/subcpu /sys/fs/cgroup/cpuacct/subcpu"
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[ "$status" -eq 0 ]
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# Check that explicit --cgroup works.
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runc exec --cgroup memory:submem --cgroup cpu,cpuacct:subcpu test_busybox cat /proc/self/cgroup
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[ "$status" -eq 0 ]
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[[ "$output" == *":memory:$REL_CGROUPS_PATH/submem"* ]]
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[[ "$output" == *":cpu"*":$REL_CGROUPS_PATH/subcpu"* ]]
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}
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@test "runc exec --cgroup subcgroup [v2]" {
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requires root cgroups_v2
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set_cgroups_path
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set_cgroup_mount_writable
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__runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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testcontainer test_busybox running
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# Check we can't join parent cgroup.
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runc exec --cgroup ".." test_busybox cat /proc/self/cgroup
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[ "$status" -ne 0 ]
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[[ "$output" == *" .. is not a sub cgroup path"* ]]
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# Check we can't join non-existing subcgroup.
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runc exec --cgroup nonexistent test_busybox cat /proc/self/cgroup
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[ "$status" -ne 0 ]
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[[ "$output" == *" adding pid "*"/nonexistent/cgroup.procs: no such file "* ]]
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# Check we can join top-level cgroup (implicit).
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runc exec test_busybox grep '^0::/$' /proc/self/cgroup
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[ "$status" -eq 0 ]
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# Check we can join top-level cgroup (explicit).
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runc exec --cgroup / test_busybox grep '^0::/$' /proc/self/cgroup
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[ "$status" -eq 0 ]
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# Now move "init" to a subcgroup, and check it was moved.
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runc exec test_busybox sh -euc "mkdir /sys/fs/cgroup/foobar \
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&& echo 1 > /sys/fs/cgroup/foobar/cgroup.procs \
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&& grep -w foobar /proc/1/cgroup"
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[ "$status" -eq 0 ]
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# The following part is taken from
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# @test "runc exec (cgroup v2 + init process in non-root cgroup) succeeds"
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# The init process is now in "/foo", but an exec process can still
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# join "/" because we haven't enabled any domain controller yet.
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runc exec test_busybox grep '^0::/$' /proc/self/cgroup
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[ "$status" -eq 0 ]
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# Turn on a domain controller (memory).
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runc exec test_busybox sh -euc 'echo $$ > /sys/fs/cgroup/foobar/cgroup.procs; echo +memory > /sys/fs/cgroup/cgroup.subtree_control'
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[ "$status" -eq 0 ]
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# An exec process can no longer join "/" after turning on a domain
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# controller. Check that cgroup v2 fallback to init cgroup works.
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runc exec test_busybox sh -euc "cat /proc/self/cgroup && grep '^0::/foobar$' /proc/self/cgroup"
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[ "$status" -eq 0 ]
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# Check that --cgroup / disables the init cgroup fallback.
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runc exec --cgroup / test_busybox true
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[ "$status" -ne 0 ]
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[[ "$output" == *" adding pid "*" to cgroups"*"/cgroup.procs: device or resource busy"* ]]
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# Check that explicit --cgroup foobar works.
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runc exec --cgroup foobar test_busybox grep '^0::/foobar$' /proc/self/cgroup
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[ "$status" -eq 0 ]
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# Check all processes is in foobar (this check is redundant).
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runc exec --cgroup foobar test_busybox sh -euc '! grep -vwH foobar /proc/*/cgroup'
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[ "$status" -eq 0 ]
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# Add a second subcgroup, check we're in it.
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runc exec --cgroup foobar test_busybox mkdir /sys/fs/cgroup/second
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[ "$status" -eq 0 ]
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runc exec --cgroup second test_busybox grep -w second /proc/self/cgroup
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[ "$status" -eq 0 ]
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}
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@test "runc exec [execve error]" {
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cat <<EOF >rootfs/run.sh
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#!/mmnnttbb foo bar
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sh
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EOF
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chmod +x rootfs/run.sh
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runc run -d --console-socket "$CONSOLE_SOCKET" test_busybox
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runc exec -t test_busybox /run.sh
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[ "$status" -ne 0 ]
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# After the sync socket closed, we should not send error to parent
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# process, or else we will get a unnecessary error log(#4171).
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# Although we never close the sync socket when doing exec,
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# but we need to keep this test to ensure this behavior is always right.
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[ ${#lines[@]} -eq 1 ]
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[[ ${lines[0]} = *"exec /run.sh: no such file or directory"* ]]
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}
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@test "runc exec with isolated cpus affinity temporary transition [cgroup cpuset]" {
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requires root cgroups_cpuset
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tmp=$(mktemp -d "$BATS_RUN_TMPDIR/runc.XXXXXX")
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set_cgroup_cpuset_all_cpus
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local all_cpus
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all_cpus="$(get_all_online_cpus)"
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# set temporary isolated CPU affinity transition
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update_config '.annotations += {"org.opencontainers.runc.exec.isolated-cpu-affinity-transition": "temporary"}'
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runc run -d --console-socket "$CONSOLE_SOCKET" test_isolated_temporary_transition
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[ "$status" -eq 0 ]
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# set all online cpus as isolated
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echo "nohz_full=$all_cpus" >"$tmp/cmdline"
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mount --bind "$tmp/cmdline" /proc/cmdline
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runc exec test_isolated_temporary_transition grep "Cpus_allowed_list:" /proc/self/status
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umount /proc/cmdline
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[ "$status" -eq 0 ]
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[[ "${lines[0]}" == "Cpus_allowed_list: $all_cpus" ]]
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}
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@test "runc exec with isolated cpus affinity definitive transition [cgroup cpuset]" {
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requires root cgroups_cpuset
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tmp=$(mktemp -d "$BATS_RUN_TMPDIR/runc.XXXXXX")
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set_cgroup_cpuset_all_cpus
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local all_cpus
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all_cpus="$(get_all_online_cpus)"
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# set definitive isolated CPU affinity transition
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update_config '.annotations += {"org.opencontainers.runc.exec.isolated-cpu-affinity-transition": "definitive"}'
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runc run -d --console-socket "$CONSOLE_SOCKET" test_isolated_definitive_transition
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[ "$status" -eq 0 ]
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# set all online cpus as isolated
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echo "nohz_full=$all_cpus" >"$tmp/cmdline"
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mount --bind "$tmp/cmdline" /proc/cmdline
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runc exec test_isolated_definitive_transition grep "Cpus_allowed_list:" /proc/self/status
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umount /proc/cmdline
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[ "$status" -eq 0 ]
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load /etc/os-release
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# fix unbound variable in condition below
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VERSION_ID=${VERSION_ID:-}
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allowed_cpus=$all_cpus
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# use first cpu on systems with RHEL >= 9 or systems with kernel >= 6.2
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if [[ "${ID_LIKE:-}" =~ "rhel" && "${VERSION_ID%%.*}" -ge "9" ]] || is_kernel_gte 6.2; then
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allowed_cpus="$(get_first_online_cpu)"
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fi
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[[ "${lines[0]}" == "Cpus_allowed_list: $allowed_cpus" ]]
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}
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@test "runc exec with isolated cpus affinity bad transition [cgroup cpuset]" {
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requires root cgroups_cpuset
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tmp=$(mktemp -d "$BATS_RUN_TMPDIR/runc.XXXXXX")
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set_cgroup_cpuset_all_cpus
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local all_cpus
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all_cpus="$(get_all_online_cpus)"
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# set a bad isolated CPU affinity transition
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update_config '.annotations += {"org.opencontainers.runc.exec.isolated-cpu-affinity-transition": "bad"}'
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runc run -d --console-socket "$CONSOLE_SOCKET" test_isolated_bad_transition
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[ "$status" -eq 0 ]
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# set all online cpus as isolated
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echo "nohz_full=$all_cpus" >"$tmp/cmdline"
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mount --bind "$tmp/cmdline" /proc/cmdline
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runc exec test_isolated_bad_transition true
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umount /proc/cmdline
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[ "$status" -eq 255 ]
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}
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@test "runc exec with taskset affinity [cgroup cpuset]" {
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requires root cgroups_cpuset
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set_cgroup_cpuset_all_cpus
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local all_cpus
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all_cpus="$(get_all_online_cpus)"
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taskset -p -c "$(get_first_online_cpu)" $$
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runc run -d --console-socket "$CONSOLE_SOCKET" test_with_taskset
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[ "$status" -eq 0 ]
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runc exec test_with_taskset grep "Cpus_allowed_list:" /proc/1/status
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[ "$status" -eq 0 ]
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[[ "${lines[0]}" == "Cpus_allowed_list: $all_cpus" ]]
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runc exec test_with_taskset grep "Cpus_allowed_list:" /proc/self/status
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[ "$status" -eq 0 ]
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[[ "${lines[0]}" == "Cpus_allowed_list: $all_cpus" ]]
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}
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@test "runc exec with taskset affinity [rootless cgroups_v2]" {
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requires rootless cgroups_v2
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local all_cpus
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all_cpus="$(get_all_online_cpus)"
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taskset -p -c "$(get_first_online_cpu)" $$
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runc run -d --console-socket "$CONSOLE_SOCKET" test_with_taskset
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[ "$status" -eq 0 ]
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runc exec test_with_taskset grep "Cpus_allowed_list:" /proc/1/status
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[ "$status" -eq 0 ]
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[[ "${lines[0]}" == "Cpus_allowed_list: $all_cpus" ]]
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runc exec test_with_taskset grep "Cpus_allowed_list:" /proc/self/status
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[ "$status" -eq 0 ]
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[[ "${lines[0]}" == "Cpus_allowed_list: $all_cpus" ]]
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}
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