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AJvYcCU8BuKwQ2PuoSc37j2SJ07ktEcy6G+x86CNXsc5G7JuLWTxqCyiSTRkTccC6mstXM+crNWmP31bgXWZrN4=@vger.kernel.org X-Gm-Message-State: AOJu0YzrRSMkCMnISiXtqPgbemviEy32GrQc63BSAkfS3kkBSbmGQnY5 dGdIjS7HmTrY/DuVLnrbKr0n74oPOgeG74PgTIKgHaTbkKM5MCmQ0P9betYJT4H4q5SFB4BQ95I kDh4q56zSzRHi1yBzSUsHfvdVHFXljIlhedXeFVzM+X5bPGBiqs5sHJUnqqc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1689:b0:663:859:c429 with SMTP id 006d021491bc7-6630f38a534mr3981897eaf.59.1769945944752; Sun, 01 Feb 2026 03:39:04 -0800 (PST) Date: Sun, 01 Feb 2026 03:39:04 -0800 In-Reply-To: <20260201110809.91962-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <697f3b58.050a0220.16b13.009f.GAE@google.com> Subject: Re: [syzbot] [kvm?] WARNING in kvm_gmem_fault_user_mapping From: syzbot To: kartikey406@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in kvm_gmem_fault_user_mapping ------------[ cut here ]------------ folio_test_large(folio) WARNING: arch/x86/kvm/../../../virt/kvm/guest_memfd.c:416 at kvm_gmem_fault_user_mapping+0x4b5/0x6e0 virt/kvm/guest_memfd.c:416, CPU#0: syz.1.84/6725 Modules linked in: CPU: 0 UID: 0 PID: 6725 Comm: syz.1.84 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:kvm_gmem_fault_user_mapping+0x4b5/0x6e0 virt/kvm/guest_memfd.c:416 Code: 00 e9 a1 fe ff ff bd 00 04 00 00 eb d9 e8 43 b8 83 00 48 c7 c6 e0 9f 82 8b 48 89 df e8 54 fb ce 00 90 0f 0b e8 2c b8 83 00 90 <0f> 0b 90 48 8d 6b 34 48 89 df e8 ec f6 bb 00 be 04 00 00 00 48 89 RSP: 0018:ffffc90004d4f848 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffffea0001380000 RCX: ffffffff81834070 RDX: ffff88802f604980 RSI: ffffffff81834334 RDI: ffff88802f604980 RBP: ffffc90004d4f9f8 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000040 R11: 0000000000000000 R12: ffffea0001380000 R13: ffffc90004d4fa08 R14: 0000000000000040 R15: ffffea0001380008 FS: 00007efea6edc6c0(0000) GS:ffff8881245d9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0db714da08 CR3: 000000005a1f9000 CR4: 00000000003526f0 Call Trace: __do_fault+0x10d/0x550 mm/memory.c:5323 do_read_fault mm/memory.c:5758 [inline] do_fault+0xaf9/0x1990 mm/memory.c:5892 do_pte_missing mm/memory.c:4404 [inline] handle_pte_fault mm/memory.c:6276 [inline] __handle_mm_fault+0x1807/0x2b50 mm/memory.c:6414 handle_mm_fault+0x36d/0xa20 mm/memory.c:6583 faultin_page mm/gup.c:1126 [inline] __get_user_pages+0xf9c/0x34d0 mm/gup.c:1428 populate_vma_page_range+0x267/0x3f0 mm/gup.c:1860 __mm_populate+0x107/0x3a0 mm/gup.c:1963 do_mlock+0x3f0/0x7f0 mm/mlock.c:653 __do_sys_mlock mm/mlock.c:661 [inline] __se_sys_mlock mm/mlock.c:659 [inline] __x64_sys_mlock+0x59/0x80 mm/mlock.c:659 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efea5f9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efea6edc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000095 RAX: ffffffffffffffda RBX: 00007efea6215fa0 RCX: 00007efea5f9aeb9 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000200000000000 RBP: 00007efea6008c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efea6216038 R14: 00007efea6215fa0 R15: 00007ffd595ac0c8 Tested on: commit: 162b4244 Merge tag 'iommu-fixes-v6.19-rc7' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10fde45a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f1fac0919970b671 dashboard link: https://syzkaller.appspot.com/bug?extid=33a04338019ac7e43a44 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 patch: https://syzkaller.appspot.com/x/patch.diff?x=116de45a580000