loop9: detected capacity change from 0 to 512 ================================================================== BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline] BUG: KASAN: use-after-free in __ext4_iget+0x2b5/0x3cb0 fs/ext4/inode.c:4704 Read of size 8 at addr ffff888132097ef8 by task syz.9.1594/6100 CPU: 1 PID: 6100 Comm: syz.9.1594 Tainted: G W 5.15.185-syzkaller-00339-ge678c93d43cc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 check_igot_inode fs/ext4/inode.c:-1 [inline] __ext4_iget+0x2b5/0x3cb0 fs/ext4/inode.c:4704 ext4_quota_enable fs/ext4/super.c:6403 [inline] ext4_enable_quotas+0x33b/0x6d0 fs/ext4/super.c:6439 ext4_fill_super+0x8761/0x9030 fs/ext4/super.c:4951 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6618 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 do_new_mount+0x25a/0xa20 fs/namespace.c:3010 path_mount+0x675/0x1020 fs/namespace.c:3340 do_mount fs/namespace.c:3353 [inline] __do_sys_mount fs/namespace.c:3561 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3538 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3538 x64_sys_call+0x6bf/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f05705d20ca Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 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:00007f056ec38e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f056ec38ef0 RCX: 00007f05705d20ca RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f056ec38eb0 RBP: 0000200000000180 R08: 00007f056ec38ef0 R09: 000000000021081e R10: 000000000021081e R11: 0000000000000246 R12: 0000200000000000 R13: 00007f056ec38eb0 R14: 0000000000000503 R15: 00002000000001c0 Allocated by task 5002: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] __kasan_slab_alloc+0xbd/0xf0 mm/kasan/common.c:466 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3255 __d_alloc+0x2d/0x6a0 fs/dcache.c:1749 d_alloc fs/dcache.c:1828 [inline] d_alloc_parallel+0xd6/0x1320 fs/dcache.c:2582 lookup_open fs/namei.c:3387 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x958/0x2f10 fs/namei.c:3739 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769 do_sys_openat2+0x14c/0x7b0 fs/open.c:1234 do_sys_open fs/open.c:1250 [inline] __do_sys_openat fs/open.c:1266 [inline] __se_sys_openat fs/open.c:1261 [inline] __x64_sys_openat+0x136/0x160 fs/open.c:1261 x64_sys_call+0x219/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:258 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0xf6/0xf60 kernel/rcu/tree.c:3125 dentry_free+0xbd/0x150 fs/dcache.c:-1 __dentry_kill+0x50a/0x650 fs/dcache.c:600 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x47/0x90 fs/dcache.c:893 do_renameat2+0x8ba/0xf60 fs/namei.c:4987 __do_sys_rename fs/namei.c:5031 [inline] __se_sys_rename fs/namei.c:5029 [inline] __x64_sys_rename+0x86/0x90 fs/namei.c:5029 x64_sys_call+0x680/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd2/0x100 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0xf6/0xf60 kernel/rcu/tree.c:3125 dentry_free+0xbd/0x150 fs/dcache.c:-1 __dentry_kill+0x50a/0x650 fs/dcache.c:600 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x47/0x90 fs/dcache.c:893 do_renameat2+0x8ba/0xf60 fs/namei.c:4987 __do_sys_rename fs/namei.c:5031 [inline] __se_sys_rename fs/namei.c:5029 [inline] __x64_sys_rename+0x86/0x90 fs/namei.c:5029 x64_sys_call+0x680/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:83 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888132097ee0 which belongs to the cache dentry of size 208 The buggy address is located 24 bytes inside of 208-byte region [ffff888132097ee0, ffff888132097fb0) The buggy address belongs to the page: page:ffffea0004c825c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888132097ee0 pfn:0x132097 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 ffffea00044c7a88 ffffea0004c8c748 ffff8881001c5800 raw: ffff888132097ee0 00000000000f0009 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x112cd0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY|__GFP_RECLAIMABLE), pid 5002, ts 399564173528, free_ts 349754148609 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5789 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0xa1/0x4d0 mm/slub.c:1995 ___slab_alloc+0x381/0x810 mm/slub.c:3028 __slab_alloc+0x49/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0x138/0x260 mm/slub.c:3255 __d_alloc+0x2d/0x6a0 fs/dcache.c:1749 d_alloc fs/dcache.c:1828 [inline] d_alloc_parallel+0xd6/0x1320 fs/dcache.c:2582 __lookup_slow+0x13e/0x3e0 fs/namei.c:1648 lookup_slow+0x57/0x70 fs/namei.c:1680 walk_component+0x325/0x460 fs/namei.c:1976 lookup_last fs/namei.c:2431 [inline] path_lookupat+0x180/0x490 fs/namei.c:2455 filename_lookup+0x1e2/0x4f0 fs/namei.c:2484 user_path_at_empty+0x47/0x1c0 fs/namei.c:2883 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5865 __free_slab+0xe8/0x1e0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab mm/slub.c:2041 [inline] __unfreeze_partials+0x160/0x190 mm/slub.c:2527 put_cpu_partial+0xc6/0x120 mm/slub.c:2607 __slab_free+0x1d4/0x290 mm/slub.c:3390 do_slab_free mm/slub.c:3509 [inline] ___cache_free+0x104/0x120 mm/slub.c:3530 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xf0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3240 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3255 getname_flags+0xb9/0x500 fs/namei.c:138 user_path_at_empty+0x30/0x1c0 fs/namei.c:2882 Memory state around the buggy address: ffff888132097d80: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff888132097e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888132097e80: fb fb fb fb fc fc fc fc fc fc fc fc fb fb fb fb ^ ffff888132097f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888132097f80: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs warning (device loop9): ext4_enable_quotas:6447: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop9): mount failed