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Thu, 27 Jul 2023 11:53:02 -0700 (PDT) Date: Thu, 27 Jul 2023 11:53:02 -0700 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000004ccc7906017c79e0@google.com> Subject: Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (2) From: syzbot To: willy@infradead.org Cc: akpm@linux-foundation.org, liam.howlett@oracle.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, willy@infradead.org Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: C178512000C X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 78i5q4wcokpitrruy8jzp8udq9yj5fai X-HE-Tag: 1690483983-626140 X-HE-Meta: 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 2jGxlf14 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000167, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Tue, Jul 25, 2023 at 11:57:22PM -0700, syzbot wrote: >> syzbot has bisected this issue to: >> >> commit a52f58b34afe095ebc5823684eb264404dad6f7b >> Author: Matthew Wilcox (Oracle) >> Date: Mon Jul 24 18:54:10 2023 +0000 >> >> mm: handle faults that merely update the accessed bit under the VMA lock >> >> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1783585ea80000 >> start commit: [unknown] >> git tree: linux-next > > #syz test linux-next a52f58b34afe095ebc5823684eb264404dad6f7b "linux-next" does not look like a valid git repo address. > > diff --git a/mm/memory.c b/mm/memory.c > index 20a2e9ed4aeb..57b271108bdc 100644 > --- a/mm/memory.c > +++ b/mm/memory.c > @@ -3567,6 +3567,12 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf) > return 0; > } > copy: > + if ((vmf->flags & FAULT_FLAG_VMA_LOCK) && !vma->anon_vma) { > + pte_unmap_unlock(vmf->pte, vmf->ptl); > + vma_end_read(vmf->vma); > + return VM_FAULT_RETRY; > + } > + > /* > * Ok, we need to copy. Oh, well.. > */