[Bug 2068577] Comment bridged from LTC Bugzilla

------- Comment From vanessa.baeza@ibm.com 2024-06-19 16:28 EDT-------
Hello! Thank you very much for your replies!

(In reply to comment #16)
> Hi,
>
> Thank you for the report!
>
> Do you mind testing and verify if you run into the same issue with the
> latest Ubuntu kernel?
> It should be 6.8.0-35.35

I upgraded all packages on the server and I'm currently on 6.8.0-35-generic.
I also tore down all NFS (up to the point of uninstalling packages).
And have tried running sosreport and I'm no longer encountering this issue. The reports get generated with no issues.
No dumps are generated.

(In reply to comment #17)
> We would also like to look at the latest sosreport command that was run
> before crashing, can you share the latest /tmp/sos.<randomname> so that we
> can inspect what is there?
>
> Thank you.
Since I can no longer reproduce this I can dig around to see if I captured this information in any earlier instance of this issue.
Is there any value in providing this information now?

(In reply to comment #18)
> Would you please retry (like my colleagues above already mentioned) with the
> latest kernel (means after full-upgrade)? Even if I cannot recreate with the
> GA kernel on my system(s).
>

> Is this really happening for you on an LPAR or in a zVM guest? (since
> dbginfo also incl. zvm data)?

It is an LPAR, not a zVM guest.

(In reply to comment #19)
> On top I've noticed that there are probably nfs shares active in your system
> (saw that in fstab).
> There is an open issue with nfs.
> Would you mind tearing down (and removing nfs) temporarily and for test
> reasons and run sosreport then again?

Removed :)

Thanks!

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https://bugs.launchpad.net/bugs/2068577

Title:
[UBUNTU 24.04] Running sosreport causes the system to crash and
produce a dump

Status in Ubuntu on IBM z Systems:
New
Status in linux package in Ubuntu:
New
Status in sosreport package in Ubuntu:
New

Bug description:
== Reported by <vanessa.baeza@ibm.com> ==

---Problem Description---
Good day, we recently installed Ubuntu 24.04 on a z LPAR.
After we run any test we usually collect the debug information in case we need it, and what happened is that each time "sosreport" is run on the server
the system crashes and produces a dump.
I'll attach the full output when the "sosreport" command was run, but this is a snippet of the last lines captured before it went down:

[plugin:zvm] skipped command 'vmcp ind sp': required kmods missing: vmcp, cpint.
[plugin:zvm] skipped command 'vmcp ind user': required kmods missing: vmcp, cpint.
Running plugins. Please wait ...

Starting 21/74 filesys [Running: block btrfs ebpf filesys]

Machine Type = s390x

Contact Information = Vanessa Baeza/vanessa.baeza@ibm.com, Michael Finnegan/finnegan@us.ibm.com, Daniel Ruiz/daniel.ruiz.gtz@ibm.com

---uname output---
Linux ilzlnx10 6.8.0-31-generic #31-Ubuntu SMP Sat Apr 20 00:14:26 UTC 2024 s390x s390x s390x GNU/Linux

---Steps to Reproduce---
Run "sosreport"

---Debugger---
A debugger is not configured

System Dump Location:
Access credentials to the server can be provided.

Oops output:
[59770.601165] [ T120907] Kernel panic - not syncing: Fatal exception: panic_on_oops

Stack trace output:
[59770.601103] [ T120907] Call Trace:
[59770.601104] [ T120907] [<0000000fc7961bf0>] mutex_lock+0x30/0x60
[59770.601107] [ T120907] ([<0000000fc7961be6>] mutex_lock+0x26/0x60)
[59770.601109] [ T120907] [<000003ff805990f8>] svc_pool_stats_start+0x40/0xd0 [sunrpc]
[59770.601146] [ T120907] [<0000000fc7031704>] seq_read_iter+0x134/0x510
[59770.601149] [ T120907] [<0000000fc7031bfc>] seq_read+0x11c/0x168
[59770.601151] [ T120907] [<0000000fc6ff4276>] vfs_read+0x96/0x328
[59770.601154] [ T120907] [<0000000fc6ff5058>] ksys_read+0x70/0x128
[59770.601156] [ T120907] [<0000000fc7954c26>] __do_syscall+0x246/0x2e8
[59770.601158] [ T120907] [<0000000fc7968510>] system_call+0x70/0x98
[59770.601161] [ T120907] Last Breaking-Event-Address:
[59770.601162] [ T120907] [<0000000fc795fd88>] __cond_resched+0x48/0x90
[59770.601165] [ T120907] Kernel panic - not syncing: Fatal exception: panic_on_oops

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