loop8: detected capacity change from 0 to 1024 ================================================================== BUG: KASAN: use-after-free in check_igot_inode fs/ext4/inode.c:-1 [inline] BUG: KASAN: use-after-free in __ext4_iget+0x2b8/0x3d80 fs/ext4/inode.c:4704 Read of size 8 at addr ffff88813072dff8 by task syz.8.8075/26079 CPU: 0 PID: 26079 Comm: syz.8.8075 Not tainted 5.15.189-syzkaller-00091-gf32b52534f1d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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+0x2b8/0x3d80 fs/ext4/inode.c:4704 ext4_quota_enable fs/ext4/super.c:6406 [inline] ext4_enable_quotas+0x33b/0x6d0 fs/ext4/super.c:6442 ext4_fill_super+0x8761/0x9030 fs/ext4/super.c:4949 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6621 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:3014 path_mount+0x675/0x1020 fs/namespace.c:3344 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3542 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3542 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: 0033:0x7fb6ff02238a 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:00007fb6fda46e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb6fda46ef0 RCX: 00007fb6ff02238a RDX: 0000200000000140 RSI: 0000200000000480 RDI: 00007fb6fda46eb0 RBP: 0000200000000140 R08: 00007fb6fda46ef0 R09: 0000000000000004 R10: 0000000000000004 R11: 0000000000000246 R12: 0000200000000480 R13: 00007fb6fda46eb0 R14: 00000000000005fd R15: 00002000000002c0 Allocated by task 8384: 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:2814 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1419 alloc_inode fs/inode.c:264 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:1011 new_inode+0x28/0x1e0 fs/inode.c:1040 f2fs_new_inode+0xd2/0x12b0 fs/f2fs/namei.c:36 __f2fs_tmpfile+0xae/0x380 fs/f2fs/namei.c:802 f2fs_tmpfile+0x136/0x220 fs/f2fs/namei.c:870 vfs_tmpfile+0x201/0x2d0 fs/namei.c:3657 ovl_do_tmpfile fs/overlayfs/overlayfs.h:277 [inline] ovl_make_workdir fs/overlayfs/super.c:1424 [inline] ovl_get_workdir+0x533/0x10b0 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:3014 path_mount+0x675/0x1020 fs/namespace.c:3344 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3542 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3542 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 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:3011 [inline] call_rcu+0x105/0xfe0 kernel/rcu/tree.c:3129 destroy_inode fs/inode.c:319 [inline] evict+0x7da/0x870 fs/inode.c:665 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 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:3014 path_mount+0x675/0x1020 fs/namespace.c:3344 do_mount fs/namespace.c:3357 [inline] __do_sys_mount fs/namespace.c:3565 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3542 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3542 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 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:3011 [inline] call_rcu+0x105/0xfe0 kernel/rcu/tree.c:3129 destroy_inode fs/inode.c:319 [inline] evict+0x7da/0x870 fs/inode.c:665 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 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 The buggy address belongs to the object at ffff88813072daf0 which belongs to the cache f2fs_inode_cache of size 1424 The buggy address is located 1288 bytes inside of 1424-byte region [ffff88813072daf0, ffff88813072e080) The buggy address belongs to the page: page:ffffea0004c1ca00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88813072b690 pfn:0x130728 head:ffffea0004c1ca00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 0000000100000001 ffff8881003e9200 raw: ffff88813072b690 0000000080150001 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 2458, ts 166474710516, free_ts 155948977642 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:5795 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:2814 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1419 alloc_inode fs/inode.c:264 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:1011 new_inode+0x28/0x1e0 fs/inode.c:1040 f2fs_new_inode+0xd2/0x12b0 fs/f2fs/namei.c:36 f2fs_mkdir+0x12b/0x540 fs/f2fs/namei.c:706 vfs_mkdir+0x387/0x580 fs/namei.c:4065 do_mkdirat+0x171/0x4c0 fs/namei.c:4090 __do_sys_mkdirat fs/namei.c:4105 [inline] __se_sys_mkdirat fs/namei.c:4103 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4103 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:5871 __free_slab+0xe8/0x1e0 mm/slub.c:2020 free_slab mm/slub.c:2035 [inline] discard_slab+0x29/0x40 mm/slub.c:2041 __slab_free+0x211/0x290 mm/slub.c:3426 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 kmem_cache_alloc_node include/linux/slab.h:489 [inline] __alloc_skb+0xe0/0x740 net/core/skbuff.c:416 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_ifinfo_build_skb+0x7c/0x180 net/core/rtnetlink.c:3884 unregister_netdevice_many+0x105c/0x1990 net/core/dev.c:11154 Memory state around the buggy address: ffff88813072de80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88813072df00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88813072df80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88813072e000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88813072e080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== EXT4-fs error (device loop8): ext4_quota_enable:6406: inode #3: comm syz.8.8075: unexpected EA_INODE flag EXT4-fs error (device loop8): ext4_quota_enable:6409: comm syz.8.8075: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop8): ext4_enable_quotas:6450: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop8): mount failed