[Darshan-users] ioctl(LL_IOC_LOV_GETSTRIPE) crashes

[Snyder, Shane]

Hi Ed,

Thanks for letting us know you're hitting this problem, too. We've had trouble reproducing this problem in the past as we haven't really had access to systems that users reported seeing the problems on, but I happen to have a Frontera account so I could look more closely there.

Our plan is still to re-implement the Lustre module using newer Lustre API calls (rather than these ioctls which are giving us problems on some system) and to confirm overheads are low enough before making the change. I'll have a look and see if it's something we might be able to include in our next release, which we are planning soon. I'll be sure to keep the list posted on our progress.

Thanks!
--Shane
________________________________
From: Darshan-users <darshan-users-bounces at lists.mcs.anl.gov> on behalf of Ed Karrels <edk at illinois.edu>
Sent: Monday, October 26, 2020 10:07 PM
To: darshan-users at lists.mcs.anl.gov <darshan-users at lists.mcs.anl.gov>
Subject: [Darshan-users] ioctl(LL_IOC_LOV_GETSTRIPE) crashes

Hello Darshan team,
I just wanted to add a data point to the ioctl(LL_IOC_LOV_GETSTRIPE) issue (which I see was discussed on this mailing list last October ("Help needed, Darshan keeps crashing in Lustre filesystem"), and in this issue: https://xgitlab.cels.anl.gov/darshan/darshan/-/issues/270.

I was trying to use Darshan 3.2.1 on Frontera at TACC, and my test program kept locking up. After a few failures the system admin let me know my failures were crashing each node I tested on.

This is one of error messages they found:
[187544.836144] Lustre: test_darshan_lo: using old ioctl(LL_IOC_LOV_GETSTRIPE) on [0x200022388:0x1776:0x0], use llapi_layout_get_by_path()[187544.848624] usercopy: kernel memory exposure attempt detected from ffff8d46b11910c0 (kmalloc-64) (48032 bytes)

I'll disable the Lustre module for now and keep an eye out for new releases.

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