================================================================== 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 ffff888111d82968 by task syz.9.1001/3784 CPU: 0 PID: 3784 Comm: syz.9.1001 Tainted: G W 5.15.185-syzkaller-00032-g0d918fa8e88d #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: 0033:0x7f2006c900ca 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:00007f20052f6e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f20052f6ef0 RCX: 00007f2006c900ca RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f20052f6eb0 RBP: 0000200000000180 R08: 00007f20052f6ef0 R09: 000000000021081e R10: 000000000021081e R11: 0000000000000246 R12: 0000200000000000 R13: 00007f20052f6eb0 R14: 00000000000004fa R15: 00002000000001c0 Allocated by task 2876: 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:2808 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1419 alloc_inode fs/inode.c:264 [inline] iget_locked+0x16c/0x7e0 fs/inode.c:1318 f2fs_iget+0x55/0x5130 fs/f2fs/inode.c:510 f2fs_fill_super+0x3a20/0x6d10 fs/f2fs/super.c:4275 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4635 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 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:319 [inline] evict+0x7da/0x870 fs/inode.c:665 iput_final fs/inode.c:1779 [inline] iput+0x635/0x7c0 fs/inode.c:1805 f2fs_put_super+0x684/0xc00 fs/f2fs/super.c:1653 generic_shutdown_super+0x151/0x330 fs/super.c:475 kill_block_super+0x7f/0xf0 fs/super.c:1427 kill_f2fs_super+0x2e7/0x390 fs/f2fs/super.c:4667 deactivate_locked_super+0xa0/0x100 fs/super.c:335 deactivate_super+0xaf/0xe0 fs/super.c:366 cleanup_mnt+0x446/0x500 fs/namespace.c:1139 __cleanup_mnt+0x19/0x20 fs/namespace.c:1146 task_work_run+0x127/0x190 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa76/0x27a0 kernel/exit.c:880 do_group_exit+0x141/0x310 kernel/exit.c:1002 __do_sys_exit_group kernel/exit.c:1013 [inline] __se_sys_exit_group kernel/exit.c:1011 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1011 x64_sys_call+0x832/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:232 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: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 f2fs_fill_super+0x639a/0x6d10 fs/f2fs/super.c:4566 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4635 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 ffff888111d82460 which belongs to the cache f2fs_inode_cache of size 1424 The buggy address is located 1288 bytes inside of 1424-byte region [ffff888111d82460, ffff888111d829f0) The buggy address belongs to the page: page:ffffea0004476000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888111d86710 pfn:0x111d80 head:ffffea0004476000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff8881081f6d80 raw: ffff888111d86710 000000008015000c 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 425, ts 33885594240, free_ts 0 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:2808 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1419 alloc_inode fs/inode.c:264 [inline] iget_locked+0x16c/0x7e0 fs/inode.c:1318 f2fs_iget+0x55/0x5130 fs/f2fs/inode.c:510 f2fs_fill_super+0x3a20/0x6d10 fs/f2fs/super.c:4275 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4635 legacy_get_tree+0xed/0x190 fs/fs_context.c:611 vfs_get_tree+0x89/0x260 fs/super.c:1530 page_owner free stack trace missing Memory state around the buggy address: ffff888111d82800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888111d82880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888111d82900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888111d82980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ffff888111d82a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc 00 00 ================================================================== 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