================================================================== BUG: KASAN: use-after-free in xfs_btree_lookup_get_block+0x15c/0x6d0 fs/xfs/libxfs/xfs_btree.c:1813 Read of size 8 at addr ffff888032e88888 by task syz-executor.1/22293 CPU: 1 PID: 22293 Comm: syz-executor.1 Not tainted 6.1.0-syzkaller-14594-g72a85e2b0a1e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x1f0 mm/kasan/report.c:417 kasan_report+0xcd/0x100 mm/kasan/report.c:517 xfs_btree_lookup_get_block+0x15c/0x6d0 fs/xfs/libxfs/xfs_btree.c:1813 xfs_btree_lookup+0x346/0x12c0 fs/xfs/libxfs/xfs_btree.c:1913 xfs_btree_simple_query_range+0xde/0x6a0 fs/xfs/libxfs/xfs_btree.c:4713 xfs_btree_query_range+0x2db/0x380 fs/xfs/libxfs/xfs_btree.c:4953 xfs_refcount_recover_cow_leftovers+0x2d1/0xa60 fs/xfs/libxfs/xfs_refcount.c:1946 xfs_reflink_recover_cow+0xab/0x1b0 fs/xfs/xfs_reflink.c:930 xlog_recover_finish+0x824/0x920 fs/xfs/xfs_log_recover.c:3493 xfs_log_mount_finish+0x1ec/0x3d0 fs/xfs/xfs_log.c:829 xfs_mountfs+0x146a/0x1ef0 fs/xfs/xfs_mount.c:933 xfs_fs_fill_super+0xf95/0x11f0 fs/xfs/xfs_super.c:1666 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4044e8d5da Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f4045bdcf88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000009712 RCX: 00007f4044e8d5da RDX: 0000000020000100 RSI: 0000000020009640 RDI: 00007f4045bdcfe0 RBP: 00007f4045bdd020 R08: 00007f4045bdd020 R09: 0000000000200800 R10: 0000000000200800 R11: 0000000000000202 R12: 0000000020000100 R13: 0000000020009640 R14: 00007f4045bdcfe0 R15: 0000000020000240 Allocated by task 21834: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x3d/0x60 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x1b3/0x350 mm/slub.c:3476 kmem_cache_zalloc include/linux/slab.h:710 [inline] xfs_btree_alloc_cursor fs/xfs/libxfs/xfs_btree.h:592 [inline] xfs_refcountbt_init_common fs/xfs/libxfs/xfs_refcount_btree.c:336 [inline] xfs_refcountbt_init_cursor+0x84/0x330 fs/xfs/libxfs/xfs_refcount_btree.c:363 xfs_refcount_recover_cow_leftovers+0x213/0xa60 fs/xfs/libxfs/xfs_refcount.c:1939 xfs_reflink_recover_cow+0xab/0x1b0 fs/xfs/xfs_reflink.c:930 xlog_recover_finish+0x824/0x920 fs/xfs/xfs_log_recover.c:3493 xfs_log_mount_finish+0x1ec/0x3d0 fs/xfs/xfs_log.c:829 xfs_mountfs+0x146a/0x1ef0 fs/xfs/xfs_mount.c:933 xfs_fs_fill_super+0xf95/0x11f0 fs/xfs/xfs_super.c:1666 get_tree_bdev+0x400/0x620 fs/super.c:1282 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888032e88840 which belongs to the cache xfs_refcbt_cur of size 200 The buggy address is located 72 bytes inside of 200-byte region [ffff888032e88840, ffff888032e88908) The buggy address belongs to the physical page: page:ffffea0000cba200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888032e88840 pfn:0x32e88 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffff88801bc20140 ffffea000100c480 dead000000000002 raw: ffff888032e88840 00000000800f0005 00000001ffffffff 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 0x112c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 7690, tgid 7639 (syz-executor.1), ts 272996479748, free_ts 272995257515 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x782/0xe20 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] slab_alloc mm/slub.c:3460 [inline] __kmem_cache_alloc_lru mm/slub.c:3467 [inline] kmem_cache_alloc+0x268/0x350 mm/slub.c:3476 kmem_cache_zalloc include/linux/slab.h:710 [inline] xfs_btree_alloc_cursor fs/xfs/libxfs/xfs_btree.h:592 [inline] xfs_refcountbt_init_common fs/xfs/libxfs/xfs_refcount_btree.c:336 [inline] xfs_refcountbt_init_cursor+0x84/0x330 fs/xfs/libxfs/xfs_refcount_btree.c:363 xfs_reflink_find_shared fs/xfs/xfs_reflink.c:146 [inline] xfs_reflink_trim_around_shared+0x45e/0x730 fs/xfs/xfs_reflink.c:193 xfs_bmap_trim_cow fs/xfs/xfs_reflink.c:241 [inline] xfs_find_trim_cow_extent+0x39c/0x490 fs/xfs/xfs_reflink.c:331 xfs_reflink_allocate_cow+0xfd/0x1090 fs/xfs/xfs_reflink.c:538 xfs_direct_write_iomap_begin+0x7a0/0x14e0 fs/xfs/xfs_iomap.c:821 iomap_iter+0x653/0x950 fs/iomap/iter.c:91 __iomap_dio_rw+0xd81/0x20c0 fs/iomap/direct-io.c:600 iomap_dio_rw+0x42/0xa0 fs/iomap/direct-io.c:689 xfs_file_dio_write_aligned+0x21a/0x340 fs/xfs/xfs_file.c:543 xfs_file_dio_write fs/xfs/xfs_file.c:655 [inline] xfs_file_write_iter+0x4fd/0x610 fs/xfs/xfs_file.c:797 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 __vunmap+0x877/0x9e0 mm/vmalloc.c:2727 free_work+0x66/0x90 mm/vmalloc.c:100 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888032e88780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032e88800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff888032e88880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888032e88900: fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb ffff888032e88980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================