From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f197.google.com (mail-il1-f197.google.com [209.85.166.197]) (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 A2F8215855E for ; Mon, 16 Sep 2024 14:44:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726497872; cv=none; b=pOYOutOkXK8mBkdGT/BKEZklNjA/vQR4qIWP0pzU2GS8LM8+4Re2m76vWVCGqzGwTPK67WXLPkKcCbkDVGkjnjz5iO0mk6ymwHzJx3cqh87hSem78gXcqoQHkGQKMeVeqt3JUY1kDSu3eItTBJ/Kd4SrFzRyS39OAc3r92VJw1I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726497872; c=relaxed/simple; bh=4XLX4me90FY3H1iDCYVuoejkzmX5dwsTmuuo5fjtF+M=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ainjouibDmQ5I6cPMcf83+5xGGa3A8y+/134K3obWzIewhyyPy8skP+P0Y6voiXs1BnLabJkSjo6EBGYDOGKgbHI3NfGEPvM97u3m+F7OXsUj71F4OXsxPhssVkfSryddg/9K+YEt6bXvxl76II4J+Y6Ew5sc3qt+yAL8HBEXTM= 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=209.85.166.197 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-il1-f197.google.com with SMTP id e9e14a558f8ab-3a0a4db9807so11564285ab.3 for ; Mon, 16 Sep 2024 07:44:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726497870; x=1727102670; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=MKq5hEn8bDO5i7Jy9Ts4snH4ZjRzxZe/KAWDe5MIK8o=; b=om1TTa5soEa2gnxwcp0i3b2oMYefy0Trz+yN5fm5ICJWTj2ozLETlbOGqhudj0RecQ yk4X7nPJYHpPoW+7n+a8+TVB5FHkkj3g6Q+r5UvP2KTi8TasCXBdm6Xfuo8Zy9UclBm2 +cV8heW3HqvDZq2E+F5E45GTesgAhA79Z2XRxBHy8ak7FPePf2CFlUQffiCRYDuLBSmX r1hswAhqiZ9aRFxiEQKYUAVvJxG9qqHICHpqExW5b7M9r6iDh38+/d7vl2GfYQfSet2L I0Hc2aKieGueS/NNCdZZMfSgBckY6HlJokx7jRmDt1B3UgLCDslBVjZI+De88jbuxAvR FLkQ== X-Forwarded-Encrypted: i=1; AJvYcCXGnGFX8xUVdw3nDyoNOHcKLiD1k+8TapV35GdfNcbu7DJnJMlibjrutwQ23wt58sIVrmuQTZvL5UqKsGk=@vger.kernel.org X-Gm-Message-State: AOJu0Yx7wOkqzhABNbC8fSkPsYXAeNrK+RIoisCKJxNIZUWxeNmWko2y rVVKTcrFabrrzARwbGyF3cQr39qCn0TB9ejxpS54L6LmIaHzPntjHjidb5P4pGIl75dKILKpCkP 6wd52Gtoar0Oh0gxM7NjWnxc5vIyaLX6T51LY3jPbuARWHrwovzV5r38= X-Google-Smtp-Source: AGHT+IGHsWAxLJVZQCTMXTSDNbeNINwzq9me0L2rRMqjBnbI4ed3iexuCNjVLpMVqrrO/vSkTSe0eK/b3PqG7Yy3LH4E201SBbUv Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c56b:0:b0:3a0:9264:c4a8 with SMTP id e9e14a558f8ab-3a09264cf57mr78051295ab.25.1726497869771; Mon, 16 Sep 2024 07:44:29 -0700 (PDT) Date: Mon, 16 Sep 2024 07:44:29 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000003bc82506223d9c64@google.com> Subject: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes 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: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1013a29f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=6f94136b4da4e897 dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/4d908436e309/disk-adfc3ded.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c7ab09b5ccee/vmlinux-adfc3ded.xz kernel image: https://storage.googleapis.com/syzbot-assets/fa3017710376/bzImage-adfc3ded.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com BTRFS info (device loop3 state EA): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d ================================================================== BUG: KASAN: slab-use-after-free in rb_left_deepest_node lib/rbtree.c:595 [inline] BUG: KASAN: slab-use-after-free in rb_first_postorder+0x69/0x90 lib/rbtree.c:628 Read of size 8 at addr ffff888056652010 by task syz-executor/11584 CPU: 1 UID: 0 PID: 11584 Comm: syz-executor Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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 rb_left_deepest_node lib/rbtree.c:595 [inline] rb_first_postorder+0x69/0x90 lib/rbtree.c:628 btrfs_cleanup_defrag_inodes+0x2f/0x80 fs/btrfs/defrag.c:212 close_ctree+0x2af/0xd20 fs/btrfs/disk-io.c:4256 generic_shutdown_super+0x139/0x2d0 fs/super.c:642 kill_anon_super+0x3b/0x70 fs/super.c:1237 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2121 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x27f0 kernel/exit.c:882 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f6e26d7def9 Code: Unable to access opcode bytes at 0x7f6e26d7decf. RSP: 002b:00007ffc1e161938 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f6e26df0a86 RCX: 00007f6e26d7def9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000010 R08: 00007ffc1e15f6d6 R09: 00007ffc1e162bf0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1e162bf0 R13: 00007f6e26df0a14 R14: 000055555899a4a8 R15: 00007ffc1e163cb0 Allocated by task 11: 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:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3989 [inline] slab_alloc_node mm/slub.c:4038 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4045 btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136 inode_should_defrag fs/btrfs/inode.c:888 [inline] cow_file_range+0x380/0x11f0 fs/btrfs/inode.c:1382 btrfs_run_delalloc_range+0x33d/0xf70 fs/btrfs/inode.c:2334 writepage_delalloc+0x482/0x7d0 fs/btrfs/extent_io.c:1192 extent_writepage fs/btrfs/extent_io.c:1454 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2130 [inline] btrfs_writepages+0x1157/0x2370 fs/btrfs/extent_io.c:2261 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658 writeback_sb_inodes+0x812/0x1370 fs/fs-writeback.c:1954 wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134 wb_do_writeback fs/fs-writeback.c:2281 [inline] wb_workfn+0x410/0x1090 fs/fs-writeback.c:2321 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x870/0xd30 kernel/workqueue.c:3393 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 Freed by task 11917: 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:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2250 [inline] slab_free mm/slub.c:4474 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4549 btrfs_cleanup_defrag_inodes+0x51/0x80 fs/btrfs/defrag.c:214 btrfs_remount_cleanup fs/btrfs/super.c:1263 [inline] btrfs_reconfigure+0x269c/0x2d40 fs/btrfs/super.c:1555 reconfigure_super+0x445/0x880 fs/super.c:1083 do_remount fs/namespace.c:3047 [inline] path_mount+0xc22/0xfa0 fs/namespace.c:3826 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 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 The buggy address belongs to the object at ffff888056652000 which belongs to the cache btrfs_inode_defrag of size 56 The buggy address is located 16 bytes inside of freed 56-byte region [ffff888056652000, ffff888056652038) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56652 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff888030f77780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000802e002e 00000001fdffffff 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 0x152c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 62, tgid 62 (kworker/u8:4), ts 261251744217, free_ts 261164089851 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1500 prep_new_page mm/page_alloc.c:1508 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3446 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4702 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2319 allocate_slab+0x5a/0x2f0 mm/slub.c:2482 new_slab mm/slub.c:2535 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3721 __slab_alloc+0x58/0xa0 mm/slub.c:3811 __slab_alloc_node mm/slub.c:3864 [inline] slab_alloc_node mm/slub.c:4026 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4045 btrfs_add_inode_defrag+0x15c/0x790 fs/btrfs/defrag.c:136 inode_should_defrag fs/btrfs/inode.c:888 [inline] compress_file_range+0x2ef/0x1300 fs/btrfs/inode.c:945 btrfs_work_helper+0x390/0xc50 fs/btrfs/async-thread.c:314 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x870/0xd30 kernel/workqueue.c:3393 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 page last free pid 7513 tgid 7512 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1101 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2619 stack_depot_save_flags+0x6f6/0x830 lib/stackdepot.c:666 kasan_save_stack mm/kasan/common.c:48 [inline] kasan_save_track+0x51/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:4159 [inline] __kmalloc_noprof+0x1fc/0x400 mm/slub.c:4171 kmalloc_noprof include/linux/slab.h:694 [inline] hfsplus_find_init+0x85/0x1c0 fs/hfsplus/bfind.c:21 hfsplus_lookup+0x1ae/0xc70 fs/hfsplus/dir.c:44 lookup_one_qstr_excl+0x11f/0x260 fs/namei.c:1633 filename_create+0x297/0x540 fs/namei.c:4027 do_mkdirat+0xbd/0x3a0 fs/namei.c:4272 __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 Memory state around the buggy address: ffff888056651f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056651f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888056652000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff888056652080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056652100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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