Hi Yi, On Thu, Nov 25, 2021 at 07:02:43PM +0800, Yi Zhang wrote: > Hello > > blktests block/031 triggered below WARNING with latest > linux-block/for-next[1], pls check it. > > [1] > f0afafc21027 (HEAD, origin/for-next) Merge branch 'for-5.17/io_uring' > into for-next After running block/031 for several times in today's linus tree, not reproduce the issue: [root@ktest-09 blktests]# uname -a Linux ktest-09 5.16.0-rc2_up+ #47 SMP PREEMPT Thu Nov 25 21:14:38 EST 2021 x86_64 x86_64 x86_64 GNU/Linux [root@ktest-09 blktests]# ./check block/031 block/031 (do IO on null-blk with a host tag set) [passed] runtime 30.302s ... 30.298s Both for-5.17/block and for-5.17/io_uring have been rebased on v5.16-rc2, maybe you can try the test again with latest block tree and see if it can be reproduced. Thanks, Ming