linux-kernel - Fwd: Ubuntu 22.04, "nvme list" will hang for 60 seconds after "nvme subsystem-reset"

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Message-ID: <8edde583-2b5f-2332-e59a-f1f4688b9e40@gmail.com>
Date:   Wed, 2 Aug 2023 18:41:01 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Keith Busch <kbusch@...nel.org>, Christoph Hellwig <hch@....de>,
        shenlinghai@....com, Jens Axboe <axboe@...com>,
        Sagi Grimberg <sagi@...mberg.me>, dwmw2@...radead.org
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux NVMe <linux-nvme@...ts.infradead.org>
Subject: Fwd: Ubuntu 22.04, "nvme list" will hang for 60 seconds after "nvme
 subsystem-reset"

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> Issue description:
> root:~# lsb_release -a
> No LSB modules are available.
> Distributor ID:	Ubuntu
> Description:	Ubuntu 22.04 LTS
> Release:	22.04
> Codename:	jammy
> 
> root:~# uname -a
> Linux dapu-Star-Lake 5.19.0-46-generic #47~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Jun 21 15:35:31 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
> 
> root:~#nvme subsystem-reset /dev/nvme0
> 
> root:~#nvme list      //This command will hang about 60 seconds. 
> 
> Issue analysis:
> Maybe it hangs in function nvme_wait_reset. When we revert the following commit, this issue will disappear.
> if (!nvme_wait_reset(ctrl))
> https://github.com/torvalds/linux/commit/1e866afd4bcdd01a70a5eddb4371158d3035ce03?diff=split

See Bugzilla for the full thread.

Anyway, I'm adding this regression to be tracked by regzbot:

#regzbot introduced: 1e866afd4bcdd0 https://bugzilla.kernel.org/show_bug.cgi?id=217745
#regzbot title: listing nvme devices hangs after subsystem reset

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217745

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