EXT4-fs (loop0): unmounting filesystem. ================================================================== BUG: KASAN: use-after-free in ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2903 Read of size 4 at addr ffff888127e7d000 by task syz-executor/467 CPU: 1 PID: 467 Comm: syz-executor Not tainted 6.1.112-syzkaller-1151978-g226e9f92a06c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350 ext4_xattr_delete_inode+0xcd0/0xce0 fs/ext4/xattr.c:2903 ext4_evict_inode+0xef9/0x1550 fs/ext4/inode.c:296 evict+0x529/0x930 fs/inode.c:701 iput_final fs/inode.c:1826 [inline] iput+0x616/0x690 fs/inode.c:1852 d_delete_notify include/linux/fsnotify.h:292 [inline] vfs_rmdir+0x3c2/0x500 fs/namei.c:4205 do_rmdir+0x3ab/0x630 fs/namei.c:4253 __do_sys_unlinkat fs/namei.c:4433 [inline] __se_sys_unlinkat fs/namei.c:4427 [inline] __x64_sys_unlinkat+0xdf/0xf0 fs/namei.c:4427 x64_sys_call+0x6e9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe959579457 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 07 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd78f3698 EFLAGS: 00000207 ORIG_RAX: 0000000000000107 RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007fe959579457 RDX: 0000000000000200 RSI: 00007fffd78f4840 RDI: 00000000ffffff9c RBP: 00007fe9595e77b4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000100 R11: 0000000000000207 R12: 00007fffd78f4840 R13: 00007fe9595e77b4 R14: 000000000000cc5a R15: 00007fffd78f69f0 The buggy address belongs to the physical page: page:ffffea00049f9f40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x127e7d flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00049aaf08 ffffea00049faf48 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 486, tgid 485 (syz.0.18), ts 52310693115, free_ts 52326698519 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x2980/0x2a10 mm/page_alloc.c:4439 __alloc_pages+0x234/0x610 mm/page_alloc.c:5728 __folio_alloc+0x15/0x40 mm/page_alloc.c:5760 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] filemap_alloc_folio include/linux/pagemap.h:513 [inline] __filemap_get_folio+0x827/0xae0 mm/filemap.c:1989 pagecache_get_page+0x2f/0x110 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:654 [inline] grow_dev_page fs/buffer.c:989 [inline] grow_buffers fs/buffer.c:1054 [inline] __getblk_slow fs/buffer.c:1081 [inline] __getblk_gfp+0x205/0x7d0 fs/buffer.c:1376 sb_getblk include/linux/buffer_head.h:356 [inline] ext4_getblk+0x2a7/0x7b0 fs/ext4/inode.c:899 ext4_bread_batch+0x67/0x4c0 fs/ext4/inode.c:966 __ext4_find_entry+0xfb9/0x1af0 fs/ext4/namei.c:1671 ext4_lookup_entry fs/ext4/namei.c:1772 [inline] ext4_lookup+0x176/0x740 fs/ext4/namei.c:1840 __lookup_slow+0x2b9/0x3e0 fs/namei.c:1689 lookup_slow+0x5a/0x80 fs/namei.c:1706 walk_component+0x2e7/0x410 fs/namei.c:1997 lookup_last fs/namei.c:2454 [inline] path_lookupat+0x16d/0x450 fs/namei.c:2478 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3511 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3659 release_pages+0xf7f/0xfe0 mm/swap.c:1063 __pagevec_release+0x84/0x100 mm/swap.c:1083 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] invalidate_mapping_pagevec+0x44a/0x520 mm/truncate.c:551 invalidate_mapping_pages+0x27/0x30 mm/truncate.c:575 invalidate_bdev+0xa6/0x140 block/bdev.c:88 ext4_put_super+0x737/0xd60 fs/ext4/super.c:1282 generic_shutdown_super+0x14f/0x370 fs/super.c:503 kill_block_super+0x7e/0xe0 fs/super.c:1472 deactivate_locked_super+0xad/0x110 fs/super.c:334 deactivate_super+0xbe/0xf0 fs/super.c:365 cleanup_mnt+0x485/0x510 fs/namespace.c:1186 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193 task_work_run+0x24d/0x2e0 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x94/0xa0 kernel/entry/common.c:177 Memory state around the buggy address: ffff888127e7cf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888127e7cf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888127e7d000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888127e7d080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127e7d100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem. EXT4-fs (loop0): unmounting filesystem.