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AJvYcCXFmdmgBfCsmBLD/M4cbaORzaMv+Hd6AYfCL+M3chKauggIu6XM2nIf08nR4Bnb4IwrkVzKR73InONQrAo=@vger.kernel.org X-Gm-Message-State: AOJu0YwMCKvj2IM+vApTio7gPTNEwkTyWvKTYP6usN4fyXxJSUxy9Kx0 CCTXnjZ/23AWTky2rhzmPtaTKwJ8V7tXL0flcbAb3kRT1rLeO/B1XjkjKhG6LsIyzLArvxwp96q GCbx9ed6yXtIhtjYsICfl0RkeEEO6/nf91HKFcWg+kgnPZlcxRJhZ80k= X-Google-Smtp-Source: AGHT+IFsT8GSHNZ2SmY9QxODQu+6/2hoO42R9sWdiFVVVfT6VS3rxnoZUzSXUivPo3MTK2Baqoyu8aD93TllRD+4Rbisvesqdrry Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1a04:b0:3a0:a1d7:791d with SMTP id e9e14a558f8ab-3a0a1d77ab5mr29200585ab.25.1726502428839; Mon, 16 Sep 2024 09:00:28 -0700 (PDT) Date: Mon, 16 Sep 2024 09:00:28 -0700 In-Reply-To: <0000000000003bc82506223d9c64@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000f9aad406223eabff@google.com> Subject: Re: [syzbot] [btrfs?] KASAN: slab-use-after-free Read in btrfs_cleanup_defrag_inodes From: syzbot To: clm@fb.com, dsterba@suse.com, fdmanana@kernel.org, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@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: adfc3ded5c33 Merge tag 'for-6.12/io_uring-discard-20240913.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=152fa29f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=71033c66cc4b01c4 dashboard link: https://syzkaller.appspot.com/bug?extid=ad7966ca1f5dd8b001b3 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=12d79c07980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=160ca8a9980000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-adfc3ded.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/14d8d89edd95/vmlinux-adfc3ded.xz kernel image: https://storage.googleapis.com/syzbot-assets/77b35977c15b/bzImage-adfc3ded.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/16dc3a6129eb/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ad7966ca1f5dd8b001b3@syzkaller.appspotmail.com BTRFS info (device loop0 state EA): last unmount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf ================================================================== 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 ffff888047515010 by task syz-executor245/5095 CPU: 0 UID: 0 PID: 5095 Comm: syz-executor245 Not tainted 6.11.0-syzkaller-02520-gadfc3ded5c33 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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: 0033:0x7f37d0596809 Code: Unable to access opcode bytes at 0x7f37d05967df. RSP: 002b:00007ffd0eed81f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f37d0596809 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001 RBP: 00007f37d0618390 R08: ffffffffffffffb8 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000246 R12: 00007f37d0618390 R13: 0000000000000000 R14: 00007f37d0619100 R15: 00007f37d05647a0 Allocated by task 5098: 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 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:430 [inline] filemap_fdatawrite_range+0x120/0x180 mm/filemap.c:448 btrfs_fdatawrite_range+0x53/0xe0 fs/btrfs/file.c:3799 btrfs_direct_write+0x565/0xa70 fs/btrfs/direct-io.c:961 btrfs_do_write_iter+0x2a0/0x760 fs/btrfs/file.c:1505 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xa6d/0xc90 fs/read_write.c:683 ksys_pwrite64 fs/read_write.c:798 [inline] __do_sys_pwrite64 fs/read_write.c:808 [inline] __se_sys_pwrite64 fs/read_write.c:805 [inline] __x64_sys_pwrite64+0x1aa/0x230 fs/read_write.c:805 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 5098: 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 vfs_cmd_reconfigure fs/fsopen.c:263 [inline] vfs_fsconfig_locked fs/fsopen.c:292 [inline] __do_sys_fsconfig fs/fsopen.c:473 [inline] __se_sys_fsconfig+0xb68/0xf70 fs/fsopen.c:345 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 ffff888047515000 which belongs to the cache btrfs_inode_defrag of size 56 The buggy address is located 16 bytes inside of freed 56-byte region [ffff888047515000, ffff888047515038) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47515 flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 04fff00000000000 ffff88803d4678c0 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 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5098, tgid 5098 (syz-executor245), ts 85167218149, free_ts 0 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] 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 filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397 __filemap_fdatawrite_range mm/filemap.c:430 [inline] filemap_fdatawrite_range+0x120/0x180 mm/filemap.c:448 page_owner free stack trace missing Memory state around the buggy address: ffff888047514f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888047514f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888047515000: fa fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc ^ ffff888047515080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888047515100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== --- 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.