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Bug#1071501: linux-image-6.1.0-21-arm64: Linux NFS client hangs in nfs4_lookup_revalidate

Cross-posted to 2 groups.

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Dear Salvatore,

I've already started bisecting. It will take some time. Usually the bug 
appears after a few hours, unfortunately I am not able to trigger it 
faster. So, if the bug appears, I can step forward easily, but if not, 
its hard to decide if it is still present and simply just have not 
occured, or if the current version is a good one. I'll try to do my 
best.

I will also contact linux-nfs mailing list.

As I remember, it started nearly a year ago, when I switched to Debian's 
kernel. I dont know exactly what version was at that time. Howewer, I've 
checked Debian's patches, and I did not find anything related to NFS.

Regards,
Richard


2024-05-20 21:07 időpontban Salvatore Bonaccorso ezt írta:
> Hi Richard,
> 
> On Mon, May 20, 2024 at 09:27:24AM +0000, Richard Kojedzinszky wrote:
>> Package: src:linux
>> Version: 6.1.90-1
>> Severity: normal
>> X-Debbugs-Cc: richard+debian+bugreport@kojedz.in
>> 
>> Dear Maintainer,
>> 
>> I am running kubernetes on debian, and pods are mounting multiple nfs
>> shares. I am running dovecot processes in PODs, which receive mails 
>> from
>> the internet, and also serves as imap server for clients. I am
>> monitoring my mail system by sending mails periodically (15 seconds) 
>> and
>> also downloading them via imap. I found a few times that some dovecot 
>> process
>> stuck in D state, a reboot was always needed to recover from that 
>> state.
>> 
>> Unfortunately, I was not able to trigger the bug really fast, I dont
>> really know what operations does dovecot issue and in what order to 
>> trigger
>> this behavior. So until I get closer, I've set up a similar, but 
>> smaller
>> environment with just a single dovecot process, and it also does the
>> same work, delivering only test mails locally, and serving them via 
>> imap
>> to the monitoring client, storing everything on NFS. Fortunately, this 
>> also
>> triggers the bug, after a few hours one of the dovecot processes is 
>> stuck
>> in D state. Kernel also shows blocked state:
> 
> As you seem in the lucky position to be able to trigger the issue in a
> more localized setup, might you:
> 
> - try as well more recent kernels from upper suites (6.8.9-1 in
>   unstable would be ideal to check if the issue is there as well).
> - I did read you cannot trigger with 5.15. If you build 6.1.90 from
>   upstream without Debian patches I assume you can trigger the issue
>   likewise? If so could you bisect the changes introducing the issue?
>   This is a cumbersome process in particular if you need few hours to
>   trigger it  So maybe the following point could be done first:
> - Can you report the issue to the linux-nfs list, keeping us in the
>   loop?
> 
> Regards,
> Salvatore

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Bug#1071501: linux-image-6.1.0-21-arm64: Linux NFS client hangs in nfs4_lookup_revalidate Richard Kojedzinszky <richard+debian+bugreport@kojedz.in> - 2024-05-20 11:40 +0200
  Bug#1071501: linux-image-6.1.0-21-arm64: Linux NFS client hangs in nfs4_lookup_revalidate Salvatore Bonaccorso <carnil@debian.org> - 2024-05-20 21:10 +0200
    Bug#1071501: linux-image-6.1.0-21-arm64: Linux NFS client hangs in nfs4_lookup_revalidate Diederik de Haas <didi.debian@cknow.org> - 2024-05-20 23:40 +0200
    Bug#1071501: linux-image-6.1.0-21-arm64: Linux NFS client hangs in nfs4_lookup_revalidate Richard Kojedzinszky <richard+debian+bugreport@kojedz.in> - 2024-05-21 10:10 +0200
  Bug#1071501: Linux NFS client hangs in nfs4_lookup_revalidate Richard Kojedzinszky <richard+debian+bugreport@kojedz.in> - 2024-05-23 14:20 +0200
  Bug#1071501: Linux NFS client hangs in nfs4_lookup_revalidate Richard Kojedzinszky <richard+debian+bugreport@kojedz.in> - 2024-05-24 07:40 +0200
    Bug#1071501: Linux NFS client hangs in nfs4_lookup_revalidate Richard Kojedzinszky <richard+debian+bugreport@kojedz.in> - 2024-05-25 18:10 +0200
  Bug#1071501: Linux NFS client hangs in nfs4_lookup_revalidate Richard Kojedzinszky <richard@kojedz.in> - 2024-05-27 06:10 +0200

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