From: Nicolin Chen <nicolinc@nvidia.com>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: <iommu@lists.linux.dev>, Joerg Roedel <joro@8bytes.org>,
Kevin Tian <kevin.tian@intel.com>,
<linux-kselftest@vger.kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Shuah Khan <shuah@kernel.org>, Will Deacon <will@kernel.org>,
Lu Baolu <baolu.lu@linux.intel.com>, <patches@lists.linux.dev>,
<syzbot+80620e2d0d0a33b09f93@syzkaller.appspotmail.com>
Subject: Re: [PATCH 0/3] Fix a race with fput during eventq abort
Date: Thu, 18 Sep 2025 13:52:03 -0700 [thread overview]
Message-ID: <aMxw85zecJepXHdR@Asurada-Nvidia> (raw)
In-Reply-To: <0-v1-02cd136829df+31-iommufd_syz_fput_jgg@nvidia.com>
On Wed, Sep 17, 2025 at 05:01:46PM -0300, Jason Gunthorpe wrote:
> Syzkaller found this, fput runs the release from a work queue so the
> refcount remains elevated during abort. This is tricky so move more
> handling of files into the core code.
>
> Add a WARN_ON to catch things like this more reliably without relying on
> kasn.
>
> Update the fail_nth test to succeed on 6.17 kernels.
>
> Jason Gunthorpe (3):
> iommufd: Fix race during abort for file descriptors
> iommufd: WARN if an object is aborted with an elevated refcount
> iommufd/selftest: Update the fail_nth limit
Sanity runs without a problem.
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
next prev parent reply other threads:[~2025-09-18 20:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-17 20:01 [PATCH 0/3] Fix a race with fput during eventq abort Jason Gunthorpe
2025-09-17 20:01 ` [PATCH 1/3] iommufd: Fix race during abort for file descriptors Jason Gunthorpe
2025-09-18 5:07 ` Nicolin Chen
2025-09-18 14:43 ` Jason Gunthorpe
2025-09-18 12:37 ` Nirmoy Das
2025-09-19 8:16 ` Tian, Kevin
2025-09-17 20:01 ` [PATCH 2/3] iommufd: WARN if an object is aborted with an elevated refcount Jason Gunthorpe
2025-09-18 6:10 ` Nicolin Chen
2025-09-18 14:47 ` Jason Gunthorpe
2025-09-18 20:49 ` Nicolin Chen
2025-09-18 20:50 ` Nicolin Chen
2025-09-19 8:16 ` Tian, Kevin
2025-09-17 20:01 ` [PATCH 3/3] iommufd/selftest: Update the fail_nth limit Jason Gunthorpe
2025-09-18 5:28 ` Nicolin Chen
2025-09-19 8:17 ` Tian, Kevin
2025-09-18 20:52 ` Nicolin Chen [this message]
2025-09-19 13:43 ` [PATCH 0/3] Fix a race with fput during eventq abort Jason Gunthorpe
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