From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B56A1C05027 for ; Thu, 9 Feb 2023 01:49:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230341AbjBIBtx (ORCPT ); Wed, 8 Feb 2023 20:49:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36522 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229687AbjBIBtv (ORCPT ); Wed, 8 Feb 2023 20:49:51 -0500 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E26D22028 for ; Wed, 8 Feb 2023 17:49:50 -0800 (PST) Received: by mail-io1-f69.google.com with SMTP id k26-20020a5d8b1a000000b0073020447349so309942ion.8 for ; Wed, 08 Feb 2023 17:49:50 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=WCjm3XDqMJ/rIukhzP8LuyX3GsAuuGdYjwTc+fA8jAA=; b=LmNlHi3Tj4tahq9tSYSeyQqKsofAsWRzdclr1XOL8zH6ZXJKndjJt5MvQgnEaEdvxg vDpSuHec5eX+2KeELKIrsyn7Tj7SjTR9hwWvKcm4kWXBAiijwmTrG6fpIzEthPPP6sR6 GKjvdaBaqVTs3HYhNrfXNoGN8bN4neMbKX+Sxsa/EQ9WZQS2JEWtPJQkYxlx2GMZ5CMk dq/gzQEr8rlD8G5jGssISkm8wgXYsl60fCeI87bdECMCIab8uWqVhzXBKpV2x3oUHlUP w3y6ZgRrdKplMsPAHc3T+9Jn6VxdGSDSAczb0l2ro7VbUuITddnQcygYqLnOn4dQtZMs lXAg== X-Gm-Message-State: AO0yUKWO/VS5uQ6TqyUWqZruHS4ufnFLXIYhVJZUYuO6Z8u13CWO6RMm enRy5QxEHX94+BbRYI+3VcHWkwkeXm1vmjn4EzN2Lsfiz5Y9 X-Google-Smtp-Source: AK7set+vbB2Jkvd3XjuPT7n7AUfCgB4H7e4HpOqvZqdJnyGMjBpvp4Rxpr2DiKpm//VxAnGpHzFo+c8b/rQS7CjJ7iCrakb5Slzi MIME-Version: 1.0 X-Received: by 2002:a02:cc64:0:b0:3c2:c93f:e40 with SMTP id j4-20020a02cc64000000b003c2c93f0e40mr1986705jaq.126.1675907389894; Wed, 08 Feb 2023 17:49:49 -0800 (PST) Date: Wed, 08 Feb 2023 17:49:49 -0800 In-Reply-To: <000000000000cce8cd05f435fc77@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a6b67d05f43a9854@google.com> Subject: Re: [syzbot] BUG: unable to handle kernel paging request in folio_flags From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, mike.kravetz@oracle.com, muchun.song@linux.dev, nathan@kernel.org, ndesaulniers@google.com, syzkaller-bugs@googlegroups.com, trix@redhat.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: 38d2b86a665b Add linux-next specific files for 20230208 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=15f5e3a7480000 kernel config: https://syzkaller.appspot.com/x/.config?x=3691b32dd4410e01 dashboard link: https://syzkaller.appspot.com/bug?extid=d632e24db18585d7b3c6 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1454ddf3480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14a8431f480000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0a9d60e90514/disk-38d2b86a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/71311be5f1a1/vmlinux-38d2b86a.xz kernel image: https://storage.googleapis.com/syzbot-assets/a242870cc8eb/bzImage-38d2b86a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d632e24db18585d7b3c6@syzkaller.appspotmail.com memfd_create() without MFD_EXEC nor MFD_NOEXEC_SEAL, pid=5080 'syz-executor561' BUG: unable to handle page fault for address: ffffffffffffffed #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD c570067 P4D c570067 PUD c572067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5080 Comm: syz-executor561 Not tainted 6.2.0-rc7-next-20230208-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 RIP: 0010:PageTail include/linux/page-flags.h:290 [inline] RIP: 0010:folio_flags.constprop.0+0x2c/0x150 include/linux/page-flags.h:317 Code: 49 89 fc 55 53 e8 84 4e b7 ff 49 8d 7c 24 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f8 00 00 00 <49> 8b 5c 24 08 31 ff 83 e3 01 48 89 de e8 c2 4a b7 ff 48 85 db 0f RSP: 0018:ffffc90003cbfc08 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffffffffffe5 RCX: 0000000000000000 RDX: 1ffffffffffffffd RSI: ffffffff81cd1f5c RDI: ffffffffffffffed RBP: ffffffffffffffe5 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffffe5 R11: 0000000000000000 R12: ffffffffffffffe5 R13: 000feffffff00000 R14: 0000000000000046 R15: 000feffffff00000 FS: 0000555556e84300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffed CR3: 000000002bb37000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: folio_test_head include/linux/page-flags.h:781 [inline] folio_test_large include/linux/page-flags.h:802 [inline] PageHeadHuge+0x18/0xc0 mm/hugetlb.c:2060 folio_test_hugetlb include/linux/page-flags.h:830 [inline] folio_file_page include/linux/pagemap.h:702 [inline] shmem_read_mapping_page_gfp+0x34/0x100 mm/shmem.c:4366 shmem_read_mapping_page include/linux/shmem_fs.h:124 [inline] udmabuf_create+0x93b/0x1440 drivers/dma-buf/udmabuf.c:286 udmabuf_ioctl_create drivers/dma-buf/udmabuf.c:346 [inline] udmabuf_ioctl+0x156/0x2c0 drivers/dma-buf/udmabuf.c:377 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb0a3f40bb9 Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd5ab9a6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb0a3f40bb9 RDX: 0000000020000080 RSI: 0000000040187542 RDI: 0000000000000005 RBP: 00007fb0a3f04d60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb0a3f04df0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: CR2: ffffffffffffffed ---[ end trace 0000000000000000 ]--- RIP: 0010:PageTail include/linux/page-flags.h:290 [inline] RIP: 0010:folio_flags.constprop.0+0x2c/0x150 include/linux/page-flags.h:317 Code: 49 89 fc 55 53 e8 84 4e b7 ff 49 8d 7c 24 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 f8 00 00 00 <49> 8b 5c 24 08 31 ff 83 e3 01 48 89 de e8 c2 4a b7 ff 48 85 db 0f RSP: 0018:ffffc90003cbfc08 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffffffffffffffe5 RCX: 0000000000000000 RDX: 1ffffffffffffffd RSI: ffffffff81cd1f5c RDI: ffffffffffffffed RBP: ffffffffffffffe5 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000ffffffe5 R11: 0000000000000000 R12: ffffffffffffffe5 R13: 000feffffff00000 R14: 0000000000000046 R15: 000feffffff00000 FS: 0000555556e84300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffed CR3: 000000002bb37000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 49 89 fc mov %rdi,%r12 3: 55 push %rbp 4: 53 push %rbx 5: e8 84 4e b7 ff callq 0xffb74e8e a: 49 8d 7c 24 08 lea 0x8(%r12),%rdi f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 16: fc ff df 19: 48 89 fa mov %rdi,%rdx 1c: 48 c1 ea 03 shr $0x3,%rdx 20: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 24: 0f 85 f8 00 00 00 jne 0x122 * 2a: 49 8b 5c 24 08 mov 0x8(%r12),%rbx <-- trapping instruction 2f: 31 ff xor %edi,%edi 31: 83 e3 01 and $0x1,%ebx 34: 48 89 de mov %rbx,%rsi 37: e8 c2 4a b7 ff callq 0xffb74afe 3c: 48 85 db test %rbx,%rbx 3f: 0f .byte 0xf