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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9FA26EB64DC for ; Sun, 9 Jul 2023 05:33:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 87A638D0001; Sun, 9 Jul 2023 01:33:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 82BFA6B0074; Sun, 9 Jul 2023 01:33:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6F2068D0001; Sun, 9 Jul 2023 01:33:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 605E36B0072 for ; Sun, 9 Jul 2023 01:33:44 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 16C51C010A for ; Sun, 9 Jul 2023 05:33:44 +0000 (UTC) X-FDA: 80990956368.02.259DE50 Received: from mail-pj1-f79.google.com (mail-pj1-f79.google.com [209.85.216.79]) by imf05.hostedemail.com (Postfix) with ESMTP id 550F2100002 for ; Sun, 9 Jul 2023 05:33:41 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf05.hostedemail.com: domain of 3tEaqZAkbABcFLM7x881ExCC50.3BB381HF1EzBAG1AG.zB9@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.216.79 as permitted sender) smtp.mailfrom=3tEaqZAkbABcFLM7x881ExCC50.3BB381HF1EzBAG1AG.zB9@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1688880821; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding:in-reply-to: references; bh=QFIFz/VfYaiGDd3grxiPcUHMlA08TfdikiLFYzzmBak=; b=h+cMm0zVuMbnFHxxPsCnpcnpH4L5Nwf1ognrQ3loPGa5MBRy74YfKI/+YzFXdZW3UwxSa0 uHL0pRWWWQw7w2k5KDaoOr5tcXx5+z9RFePGlePa0qfiy5jbgG52g3VIHx+kPyemntnz1F BCeXMVHtpcJl+rhpMYuKoAojc2xSkag= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=appspotmail.com (policy=none); spf=pass (imf05.hostedemail.com: domain of 3tEaqZAkbABcFLM7x881ExCC50.3BB381HF1EzBAG1AG.zB9@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com designates 209.85.216.79 as permitted sender) smtp.mailfrom=3tEaqZAkbABcFLM7x881ExCC50.3BB381HF1EzBAG1AG.zB9@M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1688880821; a=rsa-sha256; cv=none; b=XFbL0On6PjY239pt+CF2TxECWdWBVhsGSN3GqSG2HgA4J9yx4Hs9hrzH0vwqNF/Q08+lGS Yh4gBeMOegio/qY/Nr+OAiW6EfgcxhNT1gUIq2iyaG3PxKgS7CVfNiU8pb7ZBtq/0kLpKI bTtCR3plkzcjA5GkbG04EUUhx5iNNLc= Received: by mail-pj1-f79.google.com with SMTP id 98e67ed59e1d1-262e619fbd0so3807228a91.0 for ; Sat, 08 Jul 2023 22:33:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688880820; x=1691472820; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=QFIFz/VfYaiGDd3grxiPcUHMlA08TfdikiLFYzzmBak=; b=c/NYCUBqCciDoyLRIevUItnZMrKTKr3qluUN1X4T/wDd+Vt14zkuS7AGq7V5uWJ9Xx 4+MVn+PsCRleJX9C1YxXCE76f0FeRMq3r8XByml1hCkDwJuBFmXafINv397CxTmHvy7o UAs0Zljii4BwuxJYtDCmSENpZRBOovcd6DmiUOFn/DMYD+3PXr1lddCdcg/PJbFVLICz wU3G0nmRelMYjWHcMDDspiDnPpzVLM2x6/M3urvDTY6v5yj6zz0Wi5ITWpDYqFwygFb2 mXDq29e+olA0KWXB77LGt1yb3BfmrcCsFIKy1Cs04HOGjJwVqDHWIZuhkk4nPnZJczS7 7foQ== X-Gm-Message-State: ABy/qLY+kzk4q9Tf1cjx45Qax9eno4N9bzHENA8A/8XP4KxcTrz0DlbM qeQO1WSTd/1AKlRvXdS+/qy0f+GQa1fThPE3CrfaPhXjQmdL X-Google-Smtp-Source: APBJJlE3VrQbK07TFCKG2X0sF/V0CHCXocYaUQv+5tNe3bvViGoF5sKd9q0maEOlUgO5i+z306TKFFkqtRGV2+1htXWp/zdgJR7R MIME-Version: 1.0 X-Received: by 2002:a17:90a:d911:b0:262:ef07:f30a with SMTP id c17-20020a17090ad91100b00262ef07f30amr8139742pjv.7.1688880820099; Sat, 08 Jul 2023 22:33:40 -0700 (PDT) Date: Sat, 08 Jul 2023 22:33:39 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000599fea0600073558@google.com> Subject: [syzbot] [mm?] KASAN: slab-out-of-bounds Read in shrink_folio_list From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 550F2100002 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: qo8d9ipoubuq1j7jdzebj57pa9a9gcud X-HE-Tag: 1688880821-213256 X-HE-Meta: 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 GSjGgnmQ Fo7D1RQE/c8Y5PJsl5g3kjgTkj9tA/fU0P+83R1y3PpeXo0ejhFDyYAa9phTfNDHlTZS6CV7xo1rAcrQAA7alLvgaWKXJxjg6CtMo9OnxBQM9Ac861CDqlVzHDElULvLXq0/somDHIt2HYMyBRE9NpCHLSTohgihQbhUL/MuM6b/8DLXbJLvgS8sN9Y4p9VtRgVXGZZ2h9ovZEpQymHZQ0QO2QtVFfRuif9ZY4XSAOwzTt6/3Y7uBwdxOUsdO+nqzAmYREdwM4sJlVtVVxzoHPuxFTT8VenUUhno27ni9zTaGt07ps84EUXyHe6mRyVyPh2OpRii0Ve0wqn0zF9fI1pwvCFN9lH92qV2vxPuWN9UybSpNbBjT9A1M7P2E9iC9reTJz0d6qZSOozbu5RPkup3FRX9PXXGgx/RKpVILRfdzJPtRdK3cXBEcus4fK22uuHzbKTR/yMTvIYeCs0Mmcib+6j9Ch4LXAo5bj+p1O1nj5NsVVf8TLqsNJSMpN2bspK10If/VQEMQjxu+HnPXqVy0SZnIudfj3weIPdkWWKPAMwtTnPdRdgBb/Y7NP/FpWrVxIbOCTyFqffI61IYDgAdvAy8tdpkOsGYLqpP2s3yql8Up4F6/cUV7VySTerC4DGYHGlmUNh10pZAEj9sDT55AcPCjVx1gAAH+lO77d0z435Cz2npMiNdOdgk3Hk/Vfz+A22MWLYFGSJbfWLahuaSZ8jx9xz7rLoM07eE1c7V+IidhEfnKiMp0xoEyEQjLzp7prlTKqagGIcHLbFfFAmrEkqoCJPEzDiyCvnmbbNRnnoq8u30ErpKOzOOQNhXThIhs3uDcg05+KUqvEZCiwFSaItBFb7LZrYp5vV5G9S2p9CeEw0YHxFlA6Vnj3WYJ0DQKG0XQQUg+aSjoHP3AqIg6sXIi7krbzj/2I6WNpV87bWVGw7crqFsHVGUDXM9WwYSZzkjEPxlNzi7ZoUwrx3qa/gR4 4VyW1gJF vVCrFNJm4ow3PNXoNd4b8KUdbEjEEvedMEKk0qMcq6wHyeq7V/vcjjpAgNUqrmhl4jJpQ5rf1M32Z700iBWtlKXQ/84wGK26wnIybFy6Ewu1gtV9WhoNGX+sP8k00+NGM5ol9ht3rftu4v5u1Kkqi3w0NAWNIscreQDKe7mc9dWa9IQ6qcGolrMWnVneJDci86NmmsAH0ZvhzB2nymk0Vano6VR2CZ9TIVP6dj2jUvg+vK4izA+5Db0gKafJD2Vz3X6XLMnz1Io61XB1Srlx1XITU4vbhC8PkDVVtOhcQRo38hw+SPa5Kw== 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, syzbot found the following issue on: HEAD commit: 123212f53f3e Add linux-next specific files for 20230707 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1542771ca80000 kernel config: https://syzkaller.appspot.com/x/.config?x=15ec80b62f588543 dashboard link: https://syzkaller.appspot.com/bug?extid=c19a171264b968bf389b 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=1284666aa80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12b142bca80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/098f7ee2237c/disk-123212f5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/88defebbfc49/vmlinux-123212f5.xz kernel image: https://storage.googleapis.com/syzbot-assets/d5e9343ec16a/bzImage-123212f5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c19a171264b968bf389b@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-out-of-bounds in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-out-of-bounds in _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] BUG: KASAN: slab-out-of-bounds in mapping_release_always include/linux/pagemap.h:279 [inline] BUG: KASAN: slab-out-of-bounds in folio_needs_release mm/internal.h:187 [inline] BUG: KASAN: slab-out-of-bounds in shrink_folio_list+0x2dbf/0x3e60 mm/vmscan.c:2067 Read of size 8 at addr ffff888078d2bda1 by task syz-executor321/5029 CPU: 1 PID: 5029 Comm: syz-executor321 Not tainted 6.4.0-next-20230707-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 check_region_inline mm/kasan/generic.c:181 [inline] kasan_check_range+0xf0/0x190 mm/kasan/generic.c:187 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] mapping_release_always include/linux/pagemap.h:279 [inline] folio_needs_release mm/internal.h:187 [inline] shrink_folio_list+0x2dbf/0x3e60 mm/vmscan.c:2067 reclaim_folio_list+0xd0/0x390 mm/vmscan.c:2801 reclaim_pages+0x442/0x670 mm/vmscan.c:2837 madvise_cold_or_pageout_pte_range+0x100e/0x1ee0 mm/madvise.c:533 walk_pmd_range mm/pagewalk.c:140 [inline] walk_pud_range mm/pagewalk.c:218 [inline] walk_p4d_range mm/pagewalk.c:253 [inline] walk_pgd_range+0x9e7/0x1470 mm/pagewalk.c:290 __walk_page_range+0x651/0x780 mm/pagewalk.c:392 walk_page_range+0x311/0x4a0 mm/pagewalk.c:490 madvise_pageout_page_range mm/madvise.c:591 [inline] madvise_pageout+0x2fe/0x560 mm/madvise.c:618 madvise_vma_behavior+0x61a/0x21a0 mm/madvise.c:1039 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1268 do_madvise.part.0+0x276/0x490 mm/madvise.c:1448 do_madvise mm/madvise.c:1461 [inline] __do_sys_madvise mm/madvise.c:1461 [inline] __se_sys_madvise mm/madvise.c:1459 [inline] __x64_sys_madvise+0x117/0x150 mm/madvise.c:1459 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: 0033:0x7f0290b79c29 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe42da7dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007f0290be7ed0 RCX: 00007f0290b79c29 RDX: 0000000000000015 RSI: 0000000000600003 RDI: 0000000020000000 RBP: 00007ffe42da7dd8 R08: 00007f0290be7e40 R09: 00007f0290be7e40 R10: 00007ffe42da7840 R11: 0000000000000246 R12: 00007ffe42da7de0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 5019: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x173/0x390 mm/slub.c:3494 anon_vma_alloc mm/rmap.c:94 [inline] anon_vma_fork+0xe2/0x630 mm/rmap.c:361 dup_mmap+0xc0f/0x14b0 kernel/fork.c:732 dup_mm kernel/fork.c:1694 [inline] copy_mm kernel/fork.c:1743 [inline] copy_process+0x6663/0x75c0 kernel/fork.c:2509 kernel_clone+0xeb/0x890 kernel/fork.c:2917 __do_sys_clone+0xba/0x100 kernel/fork.c:3060 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 The buggy address belongs to the object at ffff888078d2bcc0 which belongs to the cache anon_vma of size 208 The buggy address is located 17 bytes to the right of allocated 208-byte region [ffff888078d2bcc0, ffff888078d2bd90) The buggy address belongs to the physical page: page:ffffea0001e34ac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78d2b ksm flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000200 ffff888014674140 ffffea0000ad6100 dead000000000003 raw: 0000000000000000 00000000800f000f 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 4694, tgid 4694 (dhcpcd), ts 64749636388, free_ts 46253751886 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1569 prep_new_page mm/page_alloc.c:1576 [inline] get_page_from_freelist+0xfd9/0x2c40 mm/page_alloc.c:3256 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4512 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x25f/0x390 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x371/0x390 mm/slub.c:3494 anon_vma_alloc mm/rmap.c:94 [inline] anon_vma_fork+0xe2/0x630 mm/rmap.c:361 dup_mmap+0xc0f/0x14b0 kernel/fork.c:732 dup_mm kernel/fork.c:1694 [inline] copy_mm kernel/fork.c:1743 [inline] copy_process+0x6663/0x75c0 kernel/fork.c:2509 kernel_clone+0xeb/0x890 kernel/fork.c:2917 __do_sys_clone+0xba/0x100 kernel/fork.c:3060 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 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1160 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2383 free_unref_page+0x33/0x370 mm/page_alloc.c:2478 __unfreeze_partials+0x1fe/0x220 mm/slub.c:2647 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:762 [inline] slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x173/0x390 mm/slub.c:3494 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140 getname_flags+0x9e/0xe0 include/linux/audit.h:319 vfs_fstatat+0x77/0xb0 fs/stat.c:275 __do_sys_newfstatat+0x8a/0x110 fs/stat.c:446 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 Memory state around the buggy address: ffff888078d2bc80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff888078d2bd00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888078d2bd80: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ^ ffff888078d2be00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888078d2be80: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup