================================================================== BUG: KASAN: double-free or invalid-free in kfree+0x19e/0x220 mm/slub.c:4574 CPU: 0 PID: 292 Comm: syz-executor140 Not tainted 5.15.106-syzkaller-00249-g19c0ed55a470 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 kasan_report_invalid_free+0x6b/0xa0 mm/kasan/report.c:370 __kasan_kfree_large+0x82/0x90 mm/kasan/common.c:398 kasan_kfree_large include/linux/kasan.h:201 [inline] kfree_hook mm/slub.c:1687 [inline] free_nonslab_page+0x3c/0xc0 mm/slub.c:3551 kfree+0x19e/0x220 mm/slub.c:4574 kvfree+0x35/0x40 mm/util.c:658 ext4_xattr_move_to_block fs/ext4/xattr.c:2628 [inline] ext4_xattr_make_inode_space fs/ext4/xattr.c:2691 [inline] ext4_expand_extra_isize_ea+0x1063/0x1bc0 fs/ext4/xattr.c:2783 __ext4_expand_extra_isize+0x303/0x3f0 fs/ext4/inode.c:5859 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5902 [inline] __ext4_mark_inode_dirty+0x4af/0x7a0 fs/ext4/inode.c:5980 __ext4_unlink+0x8cd/0xae0 fs/ext4/namei.c:3255 ext4_unlink+0x142/0x3f0 fs/ext4/namei.c:3298 vfs_unlink+0x38c/0x630 fs/namei.c:4209 do_unlinkat+0x47d/0x910 fs/namei.c:4277 __do_sys_unlinkat fs/namei.c:4320 [inline] __se_sys_unlinkat fs/namei.c:4313 [inline] __x64_sys_unlinkat+0xcd/0xf0 fs/namei.c:4313 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+0x61/0xcb RIP: 0033:0x7fe6fa55fc19 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffe4dc7598 EFLAGS: 00000246 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007fe6fa55fc19 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007fe6fa51f250 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe6fa51f2e0 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0004742bc0 refcount:2 mapcount:0 mapping:ffff888109197258 index:0x1 pfn:0x11d0af memcg:ffff8881001f8000 aops:def_blk_aops ino:700000 flags: 0x400000000002203e(referenced|uptodate|dirty|lru|active|private|mappedtodisk|zone=1) raw: 400000000002203e ffffea0004654108 ffffea00046f8dc8 ffff888109197258 raw: 0000000000000001 ffff88811c542498 00000002ffffffff ffff8881001f8000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 292, ts 21576650678, free_ts 21561150688 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2502 prep_new_page mm/page_alloc.c:2508 [inline] get_page_from_freelist+0x2c14/0x2cf0 mm/page_alloc.c:4291 __alloc_pages+0x386/0x7b0 mm/page_alloc.c:5569 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xb18/0xeb0 mm/filemap.c:1940 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x21e/0x7c0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] __ext4_get_inode_loc+0x4ce/0xcd0 fs/ext4/inode.c:4352 __ext4_get_inode_loc_noinmem fs/ext4/inode.c:4460 [inline] __ext4_iget+0x467/0x3e40 fs/ext4/inode.c:4665 ext4_fill_super+0x7570/0x9680 fs/ext4/super.c:4829 mount_bdev+0x281/0x3b0 fs/super.c:1378 ext4_mount+0x34/0x40 fs/ext4/super.c:6567 legacy_get_tree+0xf1/0x190 fs/fs_context.c:610 vfs_get_tree+0x88/0x290 fs/super.c:1508 do_new_mount+0x28b/0xac0 fs/namespace.c:2994 path_mount+0x671/0x1070 fs/namespace.c:3324 do_mount fs/namespace.c:3337 [inline] __do_sys_mount fs/namespace.c:3545 [inline] __se_sys_mount+0x2c4/0x3b0 fs/namespace.c:3522 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3522 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1370 [inline] free_pcp_prepare mm/page_alloc.c:1442 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3441 free_unref_page_list+0x15d/0x980 mm/page_alloc.c:3562 release_pages+0x1310/0x1370 mm/swap.c:1009 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:338 unmap_region+0x304/0x350 mm/mmap.c:2688 __do_munmap+0x1421/0x1a90 mm/mmap.c:2920 __vm_munmap+0x166/0x2a0 mm/mmap.c:2943 __do_sys_munmap mm/mmap.c:2969 [inline] __se_sys_munmap mm/mmap.c:2965 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:2965 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+0x61/0xcb Memory state around the buggy address: ffff88811d0af480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88811d0af500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88811d0af580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88811d0af600: 00 00 00