================================================================== 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 ffff888132ae7ef8 by task syz.6.5453/21180 CPU: 1 PID: 21180 Comm: syz.6.5453 Not tainted 5.15.189-syzkaller-00079-ga71626bd56a5 #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+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: 0033:0x7f7b800a314a 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:00007f7b7e709e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7b7e709ef0 RCX: 00007f7b800a314a RDX: 0000200000000180 RSI: 0000200000000240 RDI: 00007f7b7e709eb0 RBP: 0000200000000180 R08: 00007f7b7e709ef0 R09: 000000000021085e R10: 000000000021085e R11: 0000000000000246 R12: 0000200000000240 R13: 00007f7b7e709eb0 R14: 0000000000000516 R15: 0000200000000340 The buggy address belongs to the page: page:ffffea0004cab9c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x200 pfn:0x132ae7 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000200 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 7776, ts 754306986555, free_ts 1475768767837 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 proc_alloc_inode+0x1d/0xb0 fs/proc/inode.c:69 alloc_inode fs/inode.c:264 [inline] new_inode_pseudo+0x62/0x210 fs/inode.c:1011 new_inode+0x28/0x1e0 fs/inode.c:1040 proc_pid_make_inode+0x27/0x1d0 fs/proc/base.c:1959 proc_pident_instantiate+0x69/0x2b0 fs/proc/base.c:2700 proc_pident_lookup+0x1c0/0x270 fs/proc/base.c:2736 proc_tgid_base_lookup+0x2b/0x30 fs/proc/base.c:3403 lookup_open fs/namei.c:3440 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0xfcf/0x2f10 fs/namei.c:3739 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 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] __kmalloc+0x120/0x2c0 mm/slub.c:4427 __kmalloc_node include/linux/slab.h:484 [inline] kmalloc_node include/linux/slab.h:639 [inline] kvmalloc_node+0x242/0x330 mm/util.c:628 kvmalloc include/linux/mm.h:851 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x1fc/0xd30 fs/seq_file.c:210 Memory state around the buggy address: ffff888132ae7d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888132ae7e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888132ae7e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888132ae7f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888132ae7f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs warning (device loop6): ext4_enable_quotas:6450: Failed to enable quota tracking (type=0, err=-13, ino=3). Please run e2fsck to fix. EXT4-fs (loop6): mount failed