From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) (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 735D31B4F2B for ; Mon, 14 Oct 2024 15:56:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728921391; cv=none; b=d1td/dfcqpfSqcFeGioIyFjm2rrOcC+TePbeG8Zn55m5To3h121g/JAe4YAlkTSiedoxs25s+3nmALY/SkEeWtD6uf5WIX/7U7B/4V2Y9lx5e7Y67OL53OFvmYMQz5+448X/rL2NQnT8Qv5v8HWLBhrYJEu3VcyJagTvgiwdy7Y= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728921391; c=relaxed/simple; bh=AzM8yCudKL/4KeKny9ltyvt0QXG8orRcNq/+fyyPBtI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:16cf:b0:3a0:8edc:d133 with SMTP id e9e14a558f8ab-3a3b5f94601mr102121005ab.9.1728921388510; Mon, 14 Oct 2024 08:56:28 -0700 (PDT) Date: Mon, 14 Oct 2024 08:56:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <670d3f2c.050a0220.3e960.0066.GAE@google.com> Subject: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in add_delayed_ref From: syzbot To: clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d61a00525464 Add linux-next specific files for 20241011 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=16f9a887980000 kernel config: https://syzkaller.appspot.com/x/.config?x=8554528c7f4bf3fb dashboard link: https://syzkaller.appspot.com/bug?extid=c3a3a153f0190dca5be9 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1266c727980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17ce9440580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/f615720e9964/disk-d61a0052.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c4a45c7583c6/vmlinux-d61a0052.xz kernel image: https://storage.googleapis.com/syzbot-assets/d767ab86d0d0/bzImage-d61a0052.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/e1c3551adc6e/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c3a3a153f0190dca5be9@syzkaller.appspotmail.com BTRFS info (device loop0): first mount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d BTRFS info (device loop0): using sha256 (sha256-avx2) checksum algorithm BTRFS info (device loop0): using free-space-tree ================================================================== BUG: KASAN: slab-use-after-free in add_delayed_ref+0x12ca/0x1e00 fs/btrfs/delayed-ref.c:1077 Read of size 8 at addr ffff888027c83570 by task syz-executor406/11166 CPU: 1 UID: 0 PID: 11166 Comm: syz-executor406 Not tainted 6.12.0-rc2-next-20241011-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 add_delayed_ref+0x12ca/0x1e00 fs/btrfs/delayed-ref.c:1077 btrfs_alloc_tree_block+0xdfb/0x1440 fs/btrfs/extent-tree.c:5209 btrfs_force_cow_block+0x526/0x1da0 fs/btrfs/ctree.c:573 btrfs_cow_block+0x35e/0xa40 fs/btrfs/ctree.c:754 btrfs_search_slot+0xbdd/0x30d0 fs/btrfs/ctree.c:2116 btrfs_insert_empty_items+0x9c/0x1a0 fs/btrfs/ctree.c:4314 btrfs_create_new_inode+0xe27/0x1f60 fs/btrfs/inode.c:6344 btrfs_create_common+0x1d4/0x2e0 fs/btrfs/inode.c:6578 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5219f05379 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 1d 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5219eb3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f5219f8b6c8 RCX: 00007f5219f05379 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000005 RBP: 00007f5219f8b6c0 R08: 00007f5219eb36c0 R09: 0000000000000000 R10: 00007f5219eb36c0 R11: 0000000000000246 R12: 00007f5219f8b6cc R13: 0000000000000016 R14: 00007fff9f716d90 R15: 00007fff9f716e78 Allocated by task 11166: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4094 [inline] slab_alloc_node mm/slub.c:4143 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4150 add_delayed_ref+0x13a/0x1e00 fs/btrfs/delayed-ref.c:1020 btrfs_alloc_tree_block+0xdfb/0x1440 fs/btrfs/extent-tree.c:5209 btrfs_force_cow_block+0x526/0x1da0 fs/btrfs/ctree.c:573 btrfs_cow_block+0x35e/0xa40 fs/btrfs/ctree.c:754 btrfs_search_slot+0xbdd/0x30d0 fs/btrfs/ctree.c:2116 btrfs_insert_empty_items+0x9c/0x1a0 fs/btrfs/ctree.c:4314 btrfs_create_new_inode+0xe27/0x1f60 fs/btrfs/inode.c:6344 btrfs_create_common+0x1d4/0x2e0 fs/btrfs/inode.c:6578 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4257 do_mkdirat+0x264/0x3a0 fs/namei.c:4280 __do_sys_mkdirat fs/namei.c:4295 [inline] __se_sys_mkdirat fs/namei.c:4293 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4293 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 55: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2329 [inline] slab_free mm/slub.c:4588 [inline] kmem_cache_free+0x1a2/0x440 mm/slub.c:4690 btrfs_put_delayed_ref_head fs/btrfs/delayed-ref.h:358 [inline] cleanup_ref_head fs/btrfs/extent-tree.c:1932 [inline] __btrfs_run_delayed_refs+0x3d34/0x4680 fs/btrfs/extent-tree.c:2113 btrfs_run_delayed_refs+0xe3/0x2c0 fs/btrfs/extent-tree.c:2213 btrfs_commit_transaction+0x4be/0x3740 fs/btrfs/transaction.c:2197 btrfs_qgroup_rescan_worker+0x17ac/0x1c60 fs/btrfs/qgroup.c:3864 btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888027c83570 which belongs to the cache btrfs_delayed_ref_head of size 328 The buggy address is located 0 bytes inside of freed 328-byte region [ffff888027c83570, ffff888027c836b8) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x27c82 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88802fe6a000 ffffea0001ecef00 dead000000000004 raw: 0000000000000000 0000000080140014 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88802fe6a000 ffffea0001ecef00 dead000000000004 head: 0000000000000000 0000000080140014 00000001f5000000 0000000000000000 head: 00fff00000000001 ffffea00009f2081 ffffffffffffffff 0000000000000000 head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5557, tgid 5556 (syz-executor406), ts 235052280151, free_ts 234997412486 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1545 [inline] get_page_from_freelist+0x3129/0x3270 mm/page_alloc.c:3493 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4769 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x120 mm/slub.c:2399 allocate_slab+0x5a/0x2f0 mm/slub.c:2565 new_slab mm/slub.c:2618 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3805 __slab_alloc+0x58/0xa0 mm/slub.c:3895 __slab_alloc_node mm/slub.c:3970 [inline] slab_alloc_node mm/slub.c:4131 [inline] kmem_cache_alloc_noprof+0x268/0x380 mm/slub.c:4150 add_delayed_ref+0x13a/0x1e00 fs/btrfs/delayed-ref.c:1020 btrfs_free_tree_block+0x354/0xd80 fs/btrfs/extent-tree.c:3455 btrfs_force_cow_block+0xf44/0x1da0 fs/btrfs/ctree.c:622 btrfs_cow_block+0x35e/0xa40 fs/btrfs/ctree.c:754 btrfs_search_slot+0xbdd/0x30d0 fs/btrfs/ctree.c:2116 btrfs_insert_empty_items+0x9c/0x1a0 fs/btrfs/ctree.c:4314 btrfs_create_new_inode+0xe27/0x1f60 fs/btrfs/inode.c:6344 page last free pid 5558 tgid 5558 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1108 [inline] free_unref_page+0xcfb/0xf20 mm/page_alloc.c:2674 __slab_free+0x31b/0x3d0 mm/slub.c:4499 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4094 [inline] slab_alloc_node mm/slub.c:4143 [inline] kmem_cache_alloc_noprof+0x1d9/0x380 mm/slub.c:4150 getname_flags+0xb7/0x540 fs/namei.c:139 do_sys_openat2+0xd2/0x1d0 fs/open.c:1409 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888027c83400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027c83480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888027c83500: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb ^ ffff888027c83580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888027c83600: 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 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 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