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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1743111770; bh=wuNLkKAivy4ND6gJk+lfRdXsflBg+O8HRse8kZCo6g0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=RqNNF7S4votd5Xq5iAEeYkkiJIXIg9J8NFpD0RoUrhO9hbm1NqNGRNw2Y7By4KZLx XW/FQuyzNQhUU10z5i4Td0LSUXEHUwKOJB2ht0BhP3/+tTZ/30t9qQmR1oKdclsT4Y pP8VagRQBCjgSo81azT7L2tN/zbAOz5i83+L5efhoRjGgLzm83kNgOkcgj6+cSFLBD LjdVCF+x99sR/Ril4HWToOypmzBvYp0k/ZfURsGHN904zy2VVSZP4kt8g0MSdmIsE5 yq+45AADRgLSi/f7dmEunz87AWX9MfQ/ZRnCODkwTiZ0kT75swOEBTVygd0JDPIP0A 9ngntWTxCzogQ== Date: Thu, 27 Mar 2025 14:42:48 -0700 From: Luis Chamberlain To: syzbot , Jan Kara , Dave Chinner Cc: brauner@kernel.org, hare@suse.de, joel.granados@kernel.org, john.g.garry@oracle.com, kees@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Subject: Re: [syzbot] [mm?] [fs?] BUG: sleeping function called from invalid context in folio_mc_copy Message-ID: References: <67e57c41.050a0220.2f068f.0033.GAE@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <67e57c41.050a0220.2f068f.0033.GAE@google.com> X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D2D532000C X-Stat-Signature: pds1aicgapu5jrw5xyawxcy3r58wyzg1 X-Rspam-User: X-HE-Tag: 1743111771-930532 X-HE-Meta: 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 rlwEesDZ 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 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: List-Subscribe: List-Unsubscribe: On Thu, Mar 27, 2025 at 09:26:41AM -0700, syzbot wrote: > Hello, Thanks, this is a known issue and we're having a hard time reproducing [0]. > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152d4de4580000 Thanks! Sadly this has not yet been able to let me reprodouce the issue, and so we're trying to come up with other ways to test the imminent spin lock + sleep on buffer_migrate_folio_norefs() path different ways now, including a new fstests [1] but no luck yet. We will work on a fix, let's follow up on the original report [0] or the new tests case suggested thread [1] thanks! [0] https://lkml.kernel.org/r/202503101536.27099c77-lkp@intel.com [1] https://lkml.kernel.org/r/0250326185101.2237319-1-mcgrof@kernel.org Luis