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bh=GHoH25BDojkBu8zk+In6e6fb+FOzetOV9W36hZoxaC4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gvsvtpHt0gDjsnijtLvAuSIUYHj8CxhsusxzYQ5zbTGgLLUvS65MT5K7aknJ4OZjK FQdoQBkVjqrfGt/j4wJuNLE1u19IdyPXtdO9cwIiv7qURj9kBiHT/3bkUDIgVflH2t Hfpx7MFzFL0kO7Zf3jUnkVj7yCXjKKpNsXTN4WecmFfDBS6O6qnAMtZpGSAyNl3hh5 24ktlzd3m8AhYnFNj1mpZOyIJxMtOo5ifLsYSrIHLqnQJYNI1fPso+aejLeaKX9XUr QXTi/t9SzRJsv/m0m8rgMbe7EkWPKmhGUjarzvxAKXkBcxCqEFUnkZduw/bMh0y0ZF ddSMtbhpzff/A== From: SeongJae Park To: kernel test robot , Greg Kroah-Hartman Cc: oe-lkp@lists.linux.dev, lkp@intel.com, SeongJae Park , Andrew Morton , stable , devel@driverdev.osuosl.org, damon@lists.linux.dev, linux-mm@kvack.org Subject: Re: [driver-core:debugfs_lookup_fix] [mm/damon/dbgfs] ff25f87cfc: kernel_BUG_at_lib/list_debug.c Date: Wed, 4 Jan 2023 18:35:39 +0000 Message-Id: <20230104183539.1509-1-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <202301031611.c49a0c74-oliver.sang@intel.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 283C920008 X-Stat-Signature: hmttbcq6tey69p5b8u6r5x1w5fbegz8i X-HE-Tag: 1672857346-189752 X-HE-Meta: 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 LAfmes6i TmjJmUMfM0wH9gjjmhu/WumrYK6+ACbJmiRmfqvNMeHYyaCpdeBjS8FXFVMmohTlqoGWAUdpB0vC+mVV7V5IRveMGc1SwDTVxufB+TUoPJ6HaEuA7BQsR0cIPVg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello, On Tue, 3 Jan 2023 21:16:09 +0800 kernel test robot wrote: > [-- Attachment #1: Type: text/plain, Size: 7528 bytes --] > > > Greeting, > > FYI, we noticed kernel_BUG_at_lib/list_debug.c due to commit (built with gcc-11): Thank you for the report! > > commit: ff25f87cfcfc34ebe652987f2a7beb184762785b ("mm/damon/dbgfs: fix memory leak when using debugfs_lookup()") > https://git.kernel.org/cgit/linux/kernel/git/gregkh/driver-core.git debugfs_lookup_fix The commit is for fixing a memory leak due to missed dput() call. The patch has posted originally by Greg and revised my I[1]. The revised version has merged in mainline during v6.0 stabilization period (1552fd3ef7db). The problematic tree (driver-core/debugfs_lookup_fix) is based on v6.2-rc2, so the revised patch is already applied. But the first version of the patch is applied again on the tree[2], probably by mistake, and caused double 'dput()'. So I think the commit seems needs to be reverted. If there is anything I missed or wrong, please let me know. [1] https://lore.kernel.org/damon/20220902191149.112434-1-sj@kernel.org/ [2] https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?h=debugfs_lookup_fix&id=5167d3e8149e332204274910da1057e8f907d7d2 Thanks, SJ