From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f197.google.com (mail-oi1-f197.google.com [209.85.167.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3F71A20B80B for ; Sat, 26 Sep 2026 01:31:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790386291; cv=none; b=OLevr+eUKK0Z47Z+NOQtl4SfYu7TIm5hmaxnhrS10oRBLD6Bu62QjJtiWR/TwDJdgyMhenU+UCZvrk6N2ueoYlsMRgsrVbLvOrMdWJiK3NSTl0pteCv82rZ9pyquJARsci7BshwTLG7SQzVq1hGp8JNdeVEOVZzrHXvvKZUYmIE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790386291; c=relaxed/simple; bh=E5M8QhhrUI+c7txXAJHX7r7HyxnZRw+NlSkTWpXOXG4=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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2002:a05:6808:1825:b0:4d6:93e2:5bc3 with SMTP id 5614622812f47-4d72f4452b2mr8119550b6e.68.1790386288271; Fri, 25 Sep 2026 18:31:28 -0700 (PDT) Date: Fri, 25 Sep 2026 18:31:28 -0700 In-Reply-To: <6ab1c82d.514bccd6.255447.0018.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab72070.dc2998a4.2261f5.004f.GAE@google.com> Subject: Re: [syzbot] [xfs?] KASAN: slab-use-after-free Write in xlog_cil_push_work From: syzbot To: cem@kernel.org, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: aa98230e410f Merge tag 'vfs-7.3-rc5.fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=15b4025e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=718e346eb0b8f38 dashboard link: https://syzkaller.appspot.com/bug?extid=c32ff62cf4913d345d0c compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11440a05580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12a99d25580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e111cbedae47/disk-aa98230e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/448db8740448/vmlinux-aa98230e.xz kernel image: https://storage.googleapis.com/syzbot-assets/bf2dee21a792/bzImage-aa98230e.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e1fe55618d28/mount_0.gz fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=12ab2a05580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c32ff62cf4913d345d0c@syzkaller.appspotmail.com ================================================================== BUG: KASAN: slab-use-after-free in __list_splice include/linux/list.h:577 [inline] BUG: KASAN: slab-use-after-free in list_splice_init include/linux/list.h:619 [inline] BUG: KASAN: slab-use-after-free in xlog_cil_push_pcp_aggregate fs/xfs/xfs_log_cil.c:137 [inline] BUG: KASAN: slab-use-after-free in xlog_cil_push_work+0x986/0x2a90 fs/xfs/xfs_log_cil.c:1417 Write of size 8 at addr ffff88803ac995b0 by task kworker/u8:8/1160 CPU: 1 UID: 0 PID: 1160 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: xfs-cil/loop0 xlog_cil_push_work Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __list_splice include/linux/list.h:577 [inline] list_splice_init include/linux/list.h:619 [inline] xlog_cil_push_pcp_aggregate fs/xfs/xfs_log_cil.c:137 [inline] xlog_cil_push_work+0x986/0x2a90 fs/xfs/xfs_log_cil.c:1417 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 6137: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x360/0x690 mm/slub.c:5010 xfs_buf_item_init+0x6a/0x6e0 fs/xfs/xfs_buf_item.c:872 _xfs_trans_bjoin+0x46/0x110 fs/xfs/xfs_trans_buf.c:75 __xfs_trans_getsb+0x65/0x4a0 fs/xfs/xfs_trans_buf.c:191 xfs_log_sb+0x43/0x200 fs/xfs/libxfs/xfs_sb.c:1327 xfs_sync_sb_buf+0xc2/0x290 fs/xfs/libxfs/xfs_sb.c:1479 xfs_ioc_setlabel+0x1d7/0x340 fs/xfs/xfs_ioctl.c:1081 xfs_file_ioctl+0x901/0x1590 fs/xfs/xfs_ioctl.c:1238 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 6137: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kmem_cache_free+0x187/0x6d0 mm/slub.c:6635 xfs_buf_ioend+0x235/0x790 fs/xfs/xfs_buf.c:1167 xfs_buf_iowait+0x133/0x420 fs/xfs/xfs_buf.c:1336 xfs_bwrite+0x5f/0xe0 fs/xfs/xfs_buf.c:1239 xfs_sync_sb_buf+0x172/0x290 fs/xfs/libxfs/xfs_sb.c:1489 xfs_ioc_setlabel+0x1d7/0x340 fs/xfs/xfs_ioctl.c:1081 xfs_file_ioctl+0x901/0x1590 fs/xfs/xfs_ioctl.c:1238 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803ac99540 which belongs to the cache xfs_buf_item of size 272 The buggy address is located 112 bytes inside of freed 272-byte region [ffff88803ac99540, ffff88803ac99650) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3ac99 flags: 0x80000000000000(node=0|zone=1) page_type: f5(slab) raw: 0080000000000000 ffff88801e348b40 dead000000000122 0000000000000000 raw: 0000000000000000 00000002000c000c 00000000f5000000 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 0xd2c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6116, tgid 6106 (syz.4.30), ts 150746597616 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2591/0x2600 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x230/0x5c0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d8/0x350 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x339/0x690 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] kmem_cache_alloc_noprof+0x45d/0x690 mm/slub.c:5010 xfs_buf_item_init+0x6a/0x6e0 fs/xfs/xfs_buf_item.c:872 _xfs_trans_bjoin+0x46/0x110 fs/xfs/xfs_trans_buf.c:75 xfs_trans_read_buf_map+0x2ee/0x820 fs/xfs/xfs_trans_buf.c:294 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline] xfs_read_icluster+0x218/0x3e0 fs/xfs/libxfs/xfs_inode_buf.c:139 xfs_iget_cache_miss fs/xfs/xfs_icache.c:663 [inline] xfs_iget+0xc34/0x2f00 fs/xfs/xfs_icache.c:804 xfs_trans_metafile_iget+0x77/0x330 fs/xfs/xfs_icache.c:853 xfs_rtginode_load+0x3a3/0x920 fs/xfs/libxfs/xfs_rtgroup.c:469 xfs_rtmount_rtg fs/xfs/xfs_rtalloc.c:1684 [inline] xfs_rtmount_inodes+0x245/0x7a0 fs/xfs/xfs_rtalloc.c:1721 xfs_mountfs+0x1254/0x2380 fs/xfs/xfs_mount.c:1095 page last free pid 6120 tgid 6072 ts 149440641538 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] free_unref_folios+0xd0f/0x1950 mm/page_alloc.c:3022 folios_put_refs+0x815/0x920 mm/folio.c:1036 folio_batch_release include/linux/folio_batch.h:101 [inline] mapping_try_invalidate+0x3b7/0x4b0 mm/truncate.c:579 xfs_ioc_setlabel+0x262/0x340 fs/xfs/xfs_ioctl.c:1091 xfs_file_ioctl+0x901/0x1590 fs/xfs/xfs_ioctl.c:1238 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88803ac99480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88803ac99500: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb >ffff88803ac99580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803ac99600: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff88803ac99680: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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.