loop2: 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+0x2b8/0x3d80 fs/ext4/inode.c:4704 Read of size 8 at addr ffff88811f78ec18 by task syz.2.6054/22274 CPU: 0 PID: 22274 Comm: syz.2.6054 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 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:6408 [inline] ext4_enable_quotas+0x33b/0x6d0 fs/ext4/super.c:6444 ext4_fill_super+0x87c3/0x9090 fs/ext4/super.c:4951 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 ext4_mount+0x34/0x40 fs/ext4/super.c:6623 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:3025 path_mount+0x675/0x1020 fs/namespace.c:3355 do_mount fs/namespace.c:3368 [inline] __do_sys_mount fs/namespace.c:3576 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3553 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3553 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: 0033:0x7f0dd960966a 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:00007f0dd802de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f0dd802def0 RCX: 00007f0dd960966a RDX: 0000200000000180 RSI: 0000200000000000 RDI: 00007f0dd802deb0 RBP: 0000200000000180 R08: 00007f0dd802def0 R09: 000000000021081e R10: 000000000021081e R11: 0000000000000246 R12: 0000200000000000 R13: 00007f0dd802deb0 R14: 00000000000004fa R15: 00002000000001c0 Allocated by task 10475: 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:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0xf7/0x260 mm/slub.c:3260 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2819 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1459 alloc_inode fs/inode.c:264 [inline] iget_locked+0x16c/0x7e0 fs/inode.c:1318 f2fs_iget+0x55/0x5230 fs/f2fs/inode.c:517 f2fs_fill_super+0x46a7/0x6d10 fs/f2fs/super.c:4464 mount_bdev+0x2ae/0x3e0 fs/super.c:1400 f2fs_mount+0x34/0x40 fs/f2fs/super.c:4705 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:3025 path_mount+0x675/0x1020 fs/namespace.c:3355 do_mount fs/namespace.c:3368 [inline] __do_sys_mount fs/namespace.c:3576 [inline] __se_sys_mount+0x318/0x380 fs/namespace.c:3553 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3553 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 dispose_list fs/inode.c:683 [inline] evict_inodes+0x5de/0x650 fs/inode.c:737 generic_shutdown_super+0x96/0x330 fs/super.c:454 kill_block_super+0x7f/0xf0 fs/super.c:1427 kill_f2fs_super+0x2e7/0x390 fs/f2fs/super.c:4737 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 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 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 dispose_list fs/inode.c:683 [inline] evict_inodes+0x5de/0x650 fs/inode.c:737 generic_shutdown_super+0x96/0x330 fs/super.c:454 kill_block_super+0x7f/0xf0 fs/super.c:1427 kill_f2fs_super+0x2e7/0x390 fs/f2fs/super.c:4737 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 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88811f78e710 which belongs to the cache f2fs_inode_cache of size 1424 The buggy address is located 1288 bytes inside of 1424-byte region [ffff88811f78e710, ffff88811f78eca0) The buggy address belongs to the page: page:ffffea00047de200 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88811f78daf0 pfn:0x11f788 head:ffffea00047de200 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 ffffea0004a54e08 ffffea0004a55208 ffff8881081f6a80 raw: ffff88811f78daf0 0000000000150001 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 642, ts 63186988020, free_ts 37492394561 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:5808 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa1/0x4d0 mm/slub.c:2000 ___slab_alloc+0x381/0x810 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc+0x138/0x260 mm/slub.c:3260 f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2819 [inline] f2fs_alloc_inode+0x26/0x330 fs/f2fs/super.c:1459 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_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+0xfda/0x1030 mm/swap.c:1014 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+0xd6/0x180 mm/mmu_gather.c:247 zap_pte_range mm/memory.c:1526 [inline] zap_pmd_range mm/memory.c:1575 [inline] zap_pud_range mm/memory.c:1604 [inline] zap_p4d_range mm/memory.c:1625 [inline] unmap_page_range+0x1bcb/0x1d90 mm/memory.c:1646 unmap_single_vma mm/memory.c:1691 [inline] unmap_vmas+0x258/0x360 mm/memory.c:1723 exit_mmap+0x3e6/0x860 mm/mmap.c:3245 __mmput+0x93/0x320 kernel/fork.c:1180 mmput+0x50/0x150 kernel/fork.c:1203 exit_mm kernel/exit.c:554 [inline] do_exit+0x9d2/0x27a0 kernel/exit.c:876 do_group_exit+0x141/0x310 kernel/exit.c:1003 get_signal+0x66a/0x1480 kernel/signal.c:2907 arch_do_signal_or_restart+0xc1/0x10f0 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214 Memory state around the buggy address: ffff88811f78eb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88811f78eb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88811f78ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88811f78ec80: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88811f78ed00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop2): ext4_quota_enable:6408: inode #3: comm syz.2.6054: unexpected EA_INODE flag EXT4-fs error (device loop2): ext4_quota_enable:6411: comm syz.2.6054: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop2): ext4_enable_quotas:6452: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop2): mount failed