panic in the disttask/framework/scheduler.(*Manager).startScheduler

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x678e332]
goroutine 39534 [running]:
github.com/pingcap/tidb/pkg/disttask/framework/scheduler.(*Manager).startScheduler(0xc00832c360, 0xc00953bee0, {0x0, 0x0})
	pkg/disttask/framework/scheduler/scheduler_manager.go:267 +0x232
github.com/pingcap/tidb/pkg/disttask/framework/scheduler.(*Manager).scheduleTaskLoop(0xc00832c360)
	pkg/disttask/framework/scheduler/scheduler_manager.go:219 +0x10ba
github.com/pingcap/tidb/pkg/util.(*WaitGroupWrapper).Run.func1()
	pkg/util/wait_group_wrapper.go:157 +0x59
created by github.com/pingcap/tidb/pkg/util.(*WaitGroupWrapper).Run in goroutine 36840
	pkg/util/wait_group_wrapper.go:155 +0x7c
-- 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/logs/coverage/1740922507537420288#1:build-log.txt%3A3416

4. What is your TiDB version? (Required)

[ywqzzy]

/assign ywqzzy

[D3Hunter]

root cause duplicate with #49869