================================================================== BUG: KASAN: slab-use-after-free in d_inode include/linux/dcache.h:534 [inline] BUG: KASAN: slab-use-after-free in fsnotify_parent include/linux/fsnotify.h:79 [inline] BUG: KASAN: slab-use-after-free in fsnotify_path include/linux/fsnotify.h:113 [inline] BUG: KASAN: slab-use-after-free in fsnotify_file include/linux/fsnotify.h:127 [inline] BUG: KASAN: slab-use-after-free in fsnotify_close include/linux/fsnotify.h:457 [inline] BUG: KASAN: slab-use-after-free in __fput+0x19c/0xa70 fs/file_table.c:454 Read of size 8 at addr ffff888077d7e068 by task syz.2.853/8891 CPU: 0 UID: 0 PID: 8891 Comm: syz.2.853 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 d_inode include/linux/dcache.h:534 [inline] fsnotify_parent include/linux/fsnotify.h:79 [inline] fsnotify_path include/linux/fsnotify.h:113 [inline] fsnotify_file include/linux/fsnotify.h:127 [inline] fsnotify_close include/linux/fsnotify.h:457 [inline] __fput+0x19c/0xa70 fs/file_table.c:454 task_work_run+0x1d4/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6c5/0x2310 kernel/exit.c:971 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1121 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f602c18f749 Code: Unable to access opcode bytes at 0x7f602c18f71f. RSP: 002b:00007fff3b883f78 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f602c18f749 RDX: 00007f602c146c47 RSI: 0000000000000000 RDI: 000000000000000b RBP: 0000000000000003 R08: 00007fff3b884417 R09: 000000000000000b R10: 00007f602c3e5fa0 R11: 0000000000000246 R12: 00007f602c3e627c R13: 00007f602c3e6270 R14: 000000000000127a R15: 0000000000000004 Allocated by task 8892: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4948 [inline] slab_alloc_node mm/slub.c:5258 [inline] kmem_cache_alloc_lru_noprof+0x36c/0x6e0 mm/slub.c:5277 __d_alloc+0x37/0x6f0 fs/dcache.c:1730 d_alloc+0x4b/0x190 fs/dcache.c:1809 lookup_one_qstr_excl+0xdc/0x360 fs/namei.c:1743 __start_dirop fs/namei.c:2866 [inline] start_dirop fs/namei.c:2875 [inline] start_creating_noperm+0x80/0xb0 fs/namei.c:3441 mqueue_file_open ipc/mqueue.c:898 [inline] do_mq_open+0x25a/0x7c0 ipc/mqueue.c:928 __do_sys_mq_open ipc/mqueue.c:941 [inline] __se_sys_mq_open ipc/mqueue.c:934 [inline] __x64_sys_mq_open+0x16a/0x1c0 ipc/mqueue.c:934 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 23: kasan_save_stack mm/kasan/common.c:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:252 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284 kasan_slab_free include/linux/kasan.h:234 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6663 [inline] kmem_cache_free+0x197/0x620 mm/slub.c:6774 rcu_do_batch kernel/rcu/tree.c:2605 [inline] rcu_core+0xd70/0x1870 kernel/rcu/tree.c:2857 handle_softirqs+0x27d/0x850 kernel/softirq.c:626 run_ksoftirqd+0x9b/0x100 kernel/softirq.c:1067 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Last potentially related work creation: kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 __dentry_kill+0x4d2/0x660 fs/dcache.c:689 finish_dput+0xc9/0x480 fs/dcache.c:879 __fput+0x68e/0xa70 fs/file_table.c:476 task_work_run+0x1d4/0x260 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6c5/0x2310 kernel/exit.c:971 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112 __do_sys_exit_group kernel/exit.c:1123 [inline] __se_sys_exit_group kernel/exit.c:1121 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1121 __pfx_syscall_get_nr+0x0/0x10 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888077d7e000 which belongs to the cache dentry of size 312 The buggy address is located 104 bytes inside of freed 312-byte region [ffff888077d7e000, ffff888077d7e138) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77d7e head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888028eaf001 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801c282780 ffffea0001fa1780 dead000000000002 raw: 0000000000000000 0000000000150015 00000000f5000000 ffff888028eaf001 head: 00fff00000000040 ffff88801c282780 ffffea0001fa1780 dead000000000002 head: 0000000000000000 0000000000150015 00000000f5000000 ffff888028eaf001 head: 00fff00000000001 ffffea0001df5f81 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_RECLAIMABLE|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5207, tgid 5207 (udevd), ts 30470197009, free_ts 21529965305 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4651 __slab_alloc+0x65/0x100 mm/slub.c:4774 __slab_alloc_node mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:5246 [inline] kmem_cache_alloc_lru_noprof+0x3fe/0x6e0 mm/slub.c:5277 __d_alloc+0x37/0x6f0 fs/dcache.c:1730 d_alloc+0x4b/0x190 fs/dcache.c:1809 lookup_one_qstr_excl+0xdc/0x360 fs/namei.c:1743 __start_renaming+0x1db/0x410 fs/namei.c:3818 do_renameat2+0x399/0x8e0 fs/namei.c:6022 __do_sys_rename fs/namei.c:6090 [inline] __se_sys_rename fs/namei.c:6088 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:6088 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943 __free_pages mm/page_alloc.c:5329 [inline] free_contig_range+0x1bd/0x490 mm/page_alloc.c:7197 destroy_args+0x69/0x660 mm/debug_vm_pgtable.c:983 debug_vm_pgtable+0x38f/0x3a0 mm/debug_vm_pgtable.c:1372 do_one_initcall+0x1fb/0x820 init/main.c:1378 do_initcall_level+0x104/0x190 init/main.c:1440 do_initcalls+0x59/0xa0 init/main.c:1456 kernel_init_freeable+0x334/0x4b0 init/main.c:1688 kernel_init+0x1d/0x1d0 init/main.c:1578 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Memory state around the buggy address: ffff888077d7df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888077d7df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888077d7e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077d7e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077d7e100: fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 ==================================================================