From: Jason Gunthorpe <jgg@nvidia.com>
To: Mirsad Todorovac <mirsad.todorovac@alu.unizg.hr>
Cc: iommu@lists.linux.dev, Kevin Tian <kevin.tian@intel.com>,
Shuah Khan <shuah@kernel.org>,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [BUG] seltests/iommu: runaway ./iommufd consuming 99% CPU after a failed assert()
Date: Tue, 19 Mar 2024 10:58:52 -0300 [thread overview]
Message-ID: <20240319135852.GA393211@nvidia.com> (raw)
In-Reply-To: <0d5c3b29-fc5b-41d9-9556-5ce94262dac8@alu.unizg.hr>
On Tue, Mar 12, 2024 at 07:35:40AM +0100, Mirsad Todorovac wrote:
> Hi,
>
> (This is verified on the second test box.)
>
> In the most recent 6.8.0 release of torvalds tree kernel with selftest configs on,
> process ./iommufd appears to consume 99% of a CPU core for quote a while in an
> endless loop:
There is a "bug" in the ksefltest framework where if you call a
kselftest assertion from the setup/teardown it infinite loops
The fix I know is to replace kselftest assertions with normal assert()
But I don't see an obvious thing here saying you are hitting that..
Jason
next prev parent reply other threads:[~2024-03-19 13:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-12 6:35 [BUG] seltests/iommu: runaway ./iommufd consuming 99% CPU after a failed assert() Mirsad Todorovac
2024-03-19 13:58 ` Jason Gunthorpe [this message]
2024-03-23 20:13 ` Mirsad Todorovac
2024-03-25 12:17 ` Joao Martins
2024-03-25 13:52 ` Jason Gunthorpe
2024-03-27 10:41 ` Joao Martins
2024-03-27 11:40 ` Jason Gunthorpe
2024-03-27 15:04 ` Joao Martins
2024-03-27 16:38 ` Jason Gunthorpe
2024-03-28 0:05 ` Shuah Khan
2024-04-02 11:33 ` Jason Gunthorpe
2024-03-27 20:04 ` Mirsad Todorovac
2024-03-28 13:54 ` Joao Martins
2024-04-04 16:54 ` Shuah Khan
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