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 81B1D31F9A8 for ; Wed, 7 Oct 2026 01:52:34 +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=1791337956; cv=none; b=ZlxUTw3MVglOjByyMX9adUASKbnsnjFp57Mn0BKlX/d5m5OZVZeN6hdn43y39k8XCOFusTjME7b1adi2ke4D2njUc6ac6P/kWBx2ktMpQlMVxFEIBgC/l65SXTSUJg1ea4M/rKrIIs+/Mql0IQRpt5OqBu1+UJTEp1p0/KM7wE8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791337956; c=relaxed/simple; bh=WWLad+SEr7e9JuF7hdeZJsZbqRr06mF+W0UBd7VyATk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=r+XdXfggvJUncb6ftpGYbspgrO7kX8itQVG2tvjrfwEexkBVW6B6nJpD3eegP2ZiA67PYPQq8Ks2qAWAx0Fkk1wB3yKZhkCsr0ypw9Kg1Zew8BiLdw9tp0ClTqogzuQaTyv5+50MlaRk6ehp08/AVvFhQUHqEYD4X+bbNAmqv2I= 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=209.85.167.197 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-oi1-f197.google.com with SMTP id 5614622812f47-4ab4f652f9bso3045473b6e.0 for ; Tue, 06 Oct 2026 18:52:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791337953; x=1791942753; 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=Mg5IJEKwNggXAnN6aQLS4oZwLkPC0tljc12SAxzvFn0=; b=xnmhWln/Lq03dlEwjzwJ/Fc3h7XtXhYwx924TJLRYfj0vm3Vx1vAxl9EOE8V4yAePD 7fNEbpy9CZ4mmuBFqAMRtS95Qbap5gESQwLi8ZIBJ+bWL2Saktxuh15VjeF0SFGgDsV9 d6HJWBfkeg+9stQpTWMy4eG9wBSbvHG5Pcq9iarfjzOdeJZ4+13cCS/1U1a6LUn1UOyZ 8gul1ryxQ/PCUXBhsFzJS/nQOeef8BoKyE1tg9VONAOpuOlqEVH7EwGxWY2bB2QSxt8z /Y+hV71gUKwzVDYNkladvNJAe8Ku3wxZHdO7UqJ7O85q+gnxFFnw3mPNaZ2K+EQKhsQv x97A== X-Forwarded-Encrypted: i=1; AKwUvByEHmAUz9UJgHpj5O1fSMGNGeqe4bhNUHjvPgNhZq88vozQ+Rf6A/Ewy74LjDAJnmPbQEnYiIElSL/aEak=@vger.kernel.org X-Gm-Message-State: AFuF++nwdVA6BS+qI5f54qY5Eb6LA4nwj+GMIXL7yfzY1jy1c2pU8JrF +dC0NHNjKG3R+fLCsHFdDjTT2VuSk5I4QFDb8/Ha/sUHO8wpjpHsBB2tvNVLCKH5iU02XErOht6 4XC2rIq3SGFpsw/d5uqdQzudnXntOJVgM82N9e4SmvOhWeP/UXosGIl8VmQQ= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:138c:b0:4f5:eaac:5151 with SMTP id 5614622812f47-4fc462688c2mr1264168b6e.39.1791337953537; Tue, 06 Oct 2026 18:52:33 -0700 (PDT) Date: Tue, 06 Oct 2026 18:52:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ac5a5e1.9ad129c8.3ce5b3.0010.GAE@google.com> Subject: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in add_root_to_dirty_list From: syzbot To: clm@fb.com, dsterba@suse.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, mason@kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5e0f8396d480 Merge tag 'hid-for-linus-2026100201' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11e86bf5580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2b924f079099ba6e dashboard link: https://syzkaller.appspot.com/bug?extid=947286c775f432b073a8 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 (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-5e0f8396.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cc2553b94d4a/vmlinux-5e0f8396.xz kernel image: https://storage.googleapis.com/syzbot-assets/a71fb7875957/bzImage-5e0f8396.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+947286c775f432b073a8@syzkaller.appspotmail.com loop0: detected capacity change from 32768 to 0 ================================================================== BUG: KASAN: slab-use-after-free in __list_add_valid_or_report+0x4e/0x130 lib/list_debug.c:29 Read of size 8 at addr ffff888040e0a528 by task syz.0.0/5324 CPU: 0 UID: 0 PID: 5324 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 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_add_valid_or_report+0x4e/0x130 lib/list_debug.c:29 __list_add_valid include/linux/list.h:104 [inline] __list_add include/linux/list.h:169 [inline] list_add include/linux/list.h:192 [inline] list_move include/linux/list.h:345 [inline] add_root_to_dirty_list+0x38b/0x470 fs/btrfs/ctree.c:232 btrfs_force_cow_block+0xf09/0x1bf0 fs/btrfs/ctree.c:553 btrfs_cow_block+0x3f1/0xaf0 fs/btrfs/ctree.c:696 btrfs_search_slot+0xd70/0x2d20 fs/btrfs/ctree.c:-1 btrfs_search_prev_slot fs/btrfs/free-space-tree.c:134 [inline] remove_free_space_extent fs/btrfs/free-space-tree.c:732 [inline] __btrfs_remove_from_free_space_tree fs/btrfs/free-space-tree.c:837 [inline] btrfs_remove_from_free_space_tree+0x4d6/0xda0 fs/btrfs/free-space-tree.c:866 alloc_reserved_extent+0x4a/0x2b0 fs/btrfs/extent-tree.c:4976 alloc_reserved_tree_block fs/btrfs/extent-tree.c:5155 [inline] run_delayed_tree_ref fs/btrfs/extent-tree.c:1815 [inline] run_one_delayed_ref fs/btrfs/extent-tree.c:1851 [inline] btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2058 [inline] __btrfs_run_delayed_refs+0x18b5/0x43b0 fs/btrfs/extent-tree.c:2134 btrfs_run_delayed_refs+0xdc/0x2a0 fs/btrfs/extent-tree.c:2246 btrfs_commit_transaction+0x28a/0x3170 fs/btrfs/transaction.c:2267 sync_filesystem+0x1d2/0x240 fs/sync.c:66 btrfs_reconfigure+0x2dc/0x2100 fs/btrfs/super.c:1511 reconfigure_super+0x232/0x8f0 fs/super.c:1128 do_remount fs/namespace.c:3410 [inline] path_mount+0xd4e/0x1050 fs/namespace.c:4160 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount+0x31d/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 RIP: 0033:0x7f9c8dd9f3ca Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f9c8eb89e18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f9c8eb89ea0 RCX: 00007f9c8dd9f3ca RDX: 0000200000000f40 RSI: 0000200000000f00 RDI: 0000000000000000 RBP: 0000200000000f40 R08: 00007f9c8eb89ea0 R09: 0000000001a4a438 R10: 0000000001a4a438 R11: 0000000000000246 R12: 0000200000000f00 R13: 00007f9c8eb89e60 R14: 0000000000000000 R15: 00002000000008c0 Allocated by task 5323: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] btrfs_alloc_root+0x75/0x840 fs/btrfs/disk-io.c:638 btrfs_create_tree+0xa8/0x5c0 fs/btrfs/disk-io.c:832 btrfs_quota_enable+0x3d6/0x1e20 fs/btrfs/qgroup.c:1074 btrfs_ioctl_quota_ctl+0x186/0x1f0 fs/btrfs/ioctl.c:3581 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/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 5323: 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:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6508 [inline] kfree+0x1c5/0x650 mm/slub.c:6801 btrfs_quota_enable+0x1208/0x1e20 fs/btrfs/qgroup.c:1292 btrfs_ioctl_quota_ctl+0x186/0x1f0 fs/btrfs/ioctl.c:3581 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/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 ffff888040e0a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1320 bytes inside of freed 4096-byte region [ffff888040e0a000, ffff888040e0b000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x40e08 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801b042140 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801b042140 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 04fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4702, tgid 4702 (udevd), ts 61099742225 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+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 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+0x2d5/0x350 mm/slub.c:7417 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0x47b/0x720 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] tomoyo_realpath_from_path+0xef/0x640 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x2e7/0x760 security/tomoyo/file.c:928 tomoyo_path_rename+0x14e/0x1b0 security/tomoyo/tomoyo.c:300 security_path_rename+0x248/0x460 security/security.c:1544 filename_renameat2+0x4ba/0x9a0 fs/namei.c:6321 __do_sys_rename fs/namei.c:6370 [inline] __se_sys_rename+0x55/0x2c0 fs/namei.c:6366 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 page last free pid 4704 tgid 4704 ts 61084842824 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __slab_free+0x274/0x2c0 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:361 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_noprof+0x307/0x720 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] tomoyo_realpath_from_path+0xef/0x640 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x2e7/0x760 security/tomoyo/file.c:928 tomoyo_path_rename+0x14e/0x1b0 security/tomoyo/tomoyo.c:300 security_path_rename+0x248/0x460 security/security.c:1544 filename_renameat2+0x4ba/0x9a0 fs/namei.c:6321 __do_sys_rename fs/namei.c:6370 [inline] __se_sys_rename+0x55/0x2c0 fs/namei.c:6366 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: ffff888040e0a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888040e0a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888040e0a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888040e0a580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888040e0a600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- 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 report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup