loop0: 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 ffff88811f2d59e8 by task syz.0.6085/23090 CPU: 1 PID: 23090 Comm: syz.0.6085 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: 0033:0x7f7fa68320ca 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:00007f7fa4e98e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7fa4e98ef0 RCX: 00007f7fa68320ca RDX: 0000200000000080 RSI: 0000200000000000 RDI: 00007f7fa4e98eb0 RBP: 0000200000000080 R08: 00007f7fa4e98ef0 R09: 0000000002008002 R10: 0000000002008002 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f7fa4e98eb0 R14: 0000000000000558 R15: 00002000000000c0 Allocated by task 8856: 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 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2802 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1419 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:1001 new_inode+0x28/0x1e0 fs/inode.c:1030 f2fs_new_inode+0xd2/0x12b0 fs/f2fs/namei.c:36 f2fs_mkdir+0x12b/0x540 fs/f2fs/namei.c:697 vfs_mkdir+0x387/0x580 fs/namei.c:4065 do_mkdirat+0x171/0x4c0 fs/namei.c:4090 __do_sys_mkdir fs/namei.c:4110 [inline] __se_sys_mkdir fs/namei.c:4108 [inline] __x64_sys_mkdir+0x6e/0x80 fs/namei.c:4108 x64_sys_call+0x124/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:84 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 destroy_inode fs/inode.c:316 [inline] evict+0x7da/0x870 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x635/0x7c0 fs/inode.c:1795 d_delete_notify include/linux/fsnotify.h:278 [inline] vfs_rmdir+0x33f/0x460 fs/namei.c:4162 do_rmdir+0x259/0x6a0 fs/namei.c:4210 __do_sys_unlinkat fs/namei.c:4390 [inline] __se_sys_unlinkat fs/namei.c:4384 [inline] __x64_sys_unlinkat+0xc7/0xf0 fs/namei.c:4384 x64_sys_call+0x4c0/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:264 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 destroy_inode fs/inode.c:316 [inline] evict+0x7da/0x870 fs/inode.c:662 iput_final fs/inode.c:1769 [inline] iput+0x635/0x7c0 fs/inode.c:1795 dentry_unlink_inode+0x32f/0x3e0 fs/dcache.c:380 __dentry_kill+0x44f/0x650 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x47/0x90 fs/dcache.c:893 ovl_make_workdir fs/overlayfs/super.c:1427 [inline] ovl_get_workdir+0x57d/0x10b0 fs/overlayfs/super.c:1548 ovl_fill_super+0x1957/0x2a80 fs/overlayfs/super.c:2104 mount_nodev+0x5c/0xf0 fs/super.c:1446 ovl_mount+0x2c/0x40 fs/overlayfs/super.c:2194 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 The buggy address belongs to the object at ffff88811f2d54e0 which belongs to the cache f2fs_inode_cache of size 1424 The buggy address is located 1288 bytes inside of 1424-byte region [ffff88811f2d54e0, ffff88811f2d5a70) The buggy address belongs to the page: page:ffffea00047cb400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811f2d1230 pfn:0x11f2d0 head:ffffea00047cb400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff8881081f7200 raw: ffff88811f2d1230 0000000080150003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 1432, ts 136076777985, free_ts 33903125085 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 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2802 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1419 alloc_inode fs/inode.c:261 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:1001 new_inode+0x28/0x1e0 fs/inode.c:1030 f2fs_new_inode+0xd2/0x12b0 fs/f2fs/namei.c:36 f2fs_create+0x178/0x15f0 fs/f2fs/namei.c:358 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x11ae/0x2f10 fs/namei.c:3739 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769 do_sys_openat2+0x14c/0x7b0 fs/open.c:1234 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_list+0x134/0x9d0 mm/page_alloc.c:3671 release_pages+0x1076/0x10d0 mm/swap.c:1009 free_pages_and_swap_cache+0x86/0xa0 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+0x175/0x300 mm/mmu_gather.c:338 unmap_region+0x315/0x360 mm/mmap.c:2680 __do_munmap+0xa0e/0xfe0 mm/mmap.c:2913 __vm_munmap+0x15b/0x2a0 mm/mmap.c:2966 __do_sys_munmap mm/mmap.c:2992 [inline] __se_sys_munmap mm/mmap.c:2988 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:2988 x64_sys_call+0xc9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 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 Memory state around the buggy address: ffff88811f2d5880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f2d5900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811f2d5980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811f2d5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff88811f2d5a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc 00 00 ================================================================== EXT4-fs error (device loop0): ext4_quota_enable:6403: inode #3: comm syz.0.6085: unexpected EA_INODE flag EXT4-fs error (device loop0): ext4_quota_enable:6406: comm syz.0.6085: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop0): ext4_enable_quotas:6447: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop0): mount failed loop0: detected capacity change from 0 to 128