From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa2-f9.google.com (mail-oa2-f9.google.com [74.125.231.73]) (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 2A32123BCED for ; Tue, 22 Sep 2026 00:13:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790036017; cv=none; b=XvAuCBejqksFIE4zMeHZwbOzJhWnyGLOhF4dw0B4PUR0plL8EpuSMuwciYe+asAQNXGro73PPaPvjg8rJbuOrq0L8g7+lrcqeexXhLA+wzl8rFOX0nScEA1/Bn4S81F2yiRhDQ/2Oi4t/CBp3bWwnlmd/bfmyoBeI58H7cdlixE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790036017; c=relaxed/simple; bh=qwJY7dBParvjkZusqMip3ebuiHmALk4T8TF/IJwr5yw=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=uoe5qvuzFgJOarAULMvl3P87fvqwofAbVmGoEGkXjLstOW90meLSGQYWTOj8Og8lGtlsmR0OkSArhajVujT7EwLHvfg4uqQWKEozSDAfcD1rxXC6g+87/ctuvPkQVry3SHZRrRFE89/qg/q9zK1rCxAqiNSXwPHIDMg6EMOfPBA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa2-f9.google.com with SMTP id 586e51a60fabf-4840f0c24bbso1634908fac.1 for ; Mon, 21 Sep 2026 17:13:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790036014; x=1790640814; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=XxuT5WAYU+O61SPlOaWDQ1DeR9X0yve3nEnJiyruIb4=; b=lQBhSP9wmXrXCga965CZnjG8zB33ycfWcttzwbOdpbWt1A5UXhBvnc36056/rW7hnI nx8KLy2dQ7RvvzFZxZQH5Kfwi2Y4Adlyf6eWgoXknhNMcD+lpNvOH6BdYMMz0tWLpQ3S M5zvJkhU6OH1XxDY4F+cKDa4r2Osups8hMvClqQcZnJGUH52gWN/ck86xqjchpAAJDXs z2hQQNFIPxoV8XzeKPCrUSCvxz35ZT60Jz7fXLaJDC+Gn6DbJ+5WUGAvg/RoVIUoCLiX CZylIbQkd+ufJTIUzAGeqJZ8Y4pWPtN3F6wEanOtVwnxZ+T3FIuNII7+NoFa4AILrNDC CRrw== X-Forwarded-Encrypted: i=1; AKwUvBwOOn3uq9QwZY8I6MTzlk51GSfVYKUULmQ7ok8OTkAm5vlJBpkQ+iE6U0+6GktHWcGLiNAke1BX3wvj59o=@vger.kernel.org X-Gm-Message-State: AFuF++l3hCBgXQD5TctqYpbcRJTrX9AFSvy9p7CJizh3fv/kUqD1eL5K Eg3oBlQPo4KI6HvVoJ8DuyBXgPNzeikRKDIXy0JVt5fDrfZ2iUoy9Og8suzSc0JSXznWGelRMb5 R9ROXdZjFV4GTurFyrIld+tSWcPZ1v1YaIBSymVv1hu5JmPeOQVvVJOfKzRw= 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:f02a:b0:6cd:3fcc:96cc with SMTP id 006d021491bc7-6cd3fdbddcamr9119251eaf.74.1790036013992; Mon, 21 Sep 2026 17:13:33 -0700 (PDT) Date: Mon, 21 Sep 2026 17:13:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab1c82d.514bccd6.255447.0018.GAE@google.com> Subject: [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" Hello, syzbot found the following issue on: HEAD commit: 238650ef6c7c Merge tag 'powerpc-7.3-4' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17857925580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30 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 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/41924f079a65/disk-238650ef.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/09d46c75ec43/vmlinux-238650ef.xz kernel image: https://storage.googleapis.com/syzbot-assets/061e8caeb39c/bzImage-238650ef.xz 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:580 [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+0x9b6/0x2a90 fs/xfs/xfs_log_cil.c:1417 Write of size 8 at addr ffff8880261d5d88 by task kworker/u8:9/1441 CPU: 0 UID: 0 PID: 1441 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: xfs-cil/loop3 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:580 [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+0x9b6/0x2a90 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 5944: 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 5944: 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 ffff8880261d5d20 which belongs to the cache xfs_buf_item of size 272 The buggy address is located 104 bytes inside of freed 272-byte region [ffff8880261d5d20, ffff8880261d5e30) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x261d5 flags: 0x80000000000000(node=0|zone=1) page_type: f5(slab) raw: 0080000000000000 ffff88814043fdc0 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 5795, tgid 5794 (syz.3.4), ts 106215173769 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+0x14f/0x7a0 fs/xfs/xfs_rtalloc.c:1721 xfs_mountfs+0x1254/0x2380 fs/xfs/xfs_mount.c:1095 page last free pid 5581 tgid 5581 ts 106036434714 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xf8e/0x1070 mm/page_alloc.c:2962 __slab_free+0x250/0x2a0 mm/slub.c:5823 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 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] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_node_track_caller_noprof+0x505/0x7b0 mm/slub.c:5545 memdup_user+0x2b/0xd0 mm/util.c:221 strndup_user+0x68/0xd0 mm/util.c:280 copy_mount_string fs/namespace.c:4076 [inline] __do_sys_mount fs/namespace.c:4387 [inline] __se_sys_mount+0xdf/0x420 fs/namespace.c:4374 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: ffff8880261d5c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880261d5d00: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb >ffff8880261d5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880261d5e00: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 ffff8880261d5e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== --- This report is generated by a bot. 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