This commit adds a dump RCU task status function to rcu tasks tests, used to obtain more information to help debug when the RCU tasks boot-time tests failed.
Signed-off-by: Zqiang <[email protected]> --- syzbot reported the RCU tasks boot-time test failed: https://syzkaller.appspot.com/bug?extid=251e9abcdac140e7ec74 kernel/rcu/tasks.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 7f7d1e636217..d9e1e53f4ccf 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1453,6 +1453,7 @@ struct rcu_tasks_test_desc { const char *name; bool notrun; unsigned long runstart; + void (*gp_dbg)(void); }; static struct rcu_tasks_test_desc tests[] = { @@ -1460,6 +1461,8 @@ static struct rcu_tasks_test_desc tests[] = { .name = "call_rcu_tasks()", /* If not defined, the test is skipped. */ .notrun = IS_ENABLED(CONFIG_TASKS_RCU), + /* Dump rcu tasks status, if test failed. */ + .gp_dbg = show_rcu_tasks_classic_gp_kthread }, { .name = "call_rcu_tasks_trace()", @@ -1519,6 +1522,8 @@ static int rcu_tasks_verify_self_tests(void) while (tests[i].notrun) { // still hanging. if (time_after(jiffies, tests[i].runstart + bst)) { pr_err("%s has failed boot-time tests.\n", tests[i].name); + if (tests[i].gp_dbg) + tests[i].gp_dbg(); ret = -1; break; } -- 2.17.1
