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

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Date:   Mon, 7 Aug 2023 12:30:30 +0200
From:   Thorsten Leemhuis <regressions@...mhuis.info>
To:     Bagas Sanjaya <bagasdotme@...il.com>,
        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: Re: Fwd: Ubuntu 22.04, "nvme list" will hang for 60 seconds after
 "nvme subsystem-reset"

On 02.08.23 13:41, Bagas Sanjaya wrote:
> 
> 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

Bagas, please don't forward reports to the developers (and also don't
add them to the regression tracking) if the report is about a problem
with a vendor kernel that is known or likely to be patched[1].
Developers otherwise will just start to ignore your mails, as you are
wasting their time.

Ciao, Thorsten

[1] unless of course the reporter confirmed that the issue also happens
with a fresh vanilla kernel; but that afaics still hasn't happened in
this case yet; and even if that's the case it must be really obvious
when forwarding a report.

>> 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
>