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4d9bf608b5
The idea of the test is: 1) mmap separate page and put variable there, so that other usage does not dirty these region. Initialize the variable with VALUE_A. 2) fork a child with special pid == CHILD_NS_PID. Only if it is a first child overwrite the variable with VALUE_B. 3) wait for the end of the next predump or end of restore with test_wait_pre_dump_ack/test_wait_pre_dump pair and kill our child. Note: The memory region is "clean" in parent. 4) goto (2) unles end of cr is reported by test_waitpre So on first iteration child with pid CHILD_NS_PID was dumped with VALUE_B, on all other iterations and on final dump other child with the same pid exists but with VALUE_A. But on all iterations after the first one we have these memory region "clean". So criu before the fix would have restored the VALUE_B taking it from first child's image, but should restore VALUE_A. Note: Child in its turn waits termination and performs a check that variable value doesn't change after c/r. We should run the test with at least one predump to trigger the problem: [root@snorch criu]# ./test/zdtm.py run --pre 1 -k always -t zdtm/transition/pid_reuse Checking feature ns_pid Checking feature ns_get_userns Checking feature ns_get_parent === Run 1/1 ================ zdtm/transition/pid_reuse ===================== Run zdtm/transition/pid_reuse in ns ====================== DEP pid_reuse.d CC pid_reuse.o LINK pid_reuse Start test Test is SUID ./pid_reuse --pidfile=pid_reuse.pid --outfile=pid_reuse.out Run criu pre-dump Send the 10 signal to 52 Run criu dump Run criu restore Send the 15 signal to 73 Wait for zdtm/transition/pid_reuse(73) to die for 0.100000 Test output: ================================ 14:47:57.717: 11235: ERR: pid_reuse.c:76: Wrong value in a variable after restore 14:47:57.717: 4: FAIL: pid_reuse.c:110: Task 11235 exited with wrong code 1 (errno = 11 (Resource temporarily unavailable)) <<< ================================ https://jira.sw.ru/browse/PSBM-67502 v3: simplify waitpid's status check v9: switch to test_wait_pre_dump(_ack) Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Signed-off-by: Andrei Vagin <avagin@virtuozzo.com> |
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| .. | ||
| compel | ||
| inhfd | ||
| jenkins | ||
| others | ||
| zdtm | ||
| .gitignore | ||
| abrt.sh | ||
| check_actions.py | ||
| crit-recode.py | ||
| empty-netns-prep.sh | ||
| groups.desc | ||
| inhfd.desc | ||
| Makefile | ||
| pycriu | ||
| show_action.sh | ||
| umount2.c | ||
| zdtm.desc | ||
| zdtm.py | ||
| zdtm_ct.c | ||
| zdtm_mount_cgroups | ||