================================================================== BUG: KASAN: slab-use-after-free in __raw_spin_lock include/linux/spinlock_api_smp.h:190 [inline] BUG: KASAN: slab-use-after-free in _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173 Read of size 1 at addr ffff8880523249a0 by task kworker/u8:0/12 CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026 Workqueue: events_unbound cfg80211_wiphy_work Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 __kasan_check_byte+0x2a/0x40 mm/kasan/common.c:585 kasan_check_byte include/linux/kasan.h:402 [inline] lock_acquire+0x7d/0x350 kernel/locking/lockdep.c:5916 __raw_spin_lock include/linux/spinlock_api_smp.h:190 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173 spin_lock include/linux/spinlock.h:347 [inline] lockref_get+0x15/0x60 lib/lockref.c:50 dget include/linux/dcache.h:364 [inline] __simple_recursive_removal+0x33/0x520 fs/libfs.c:601 debugfs_remove+0x5b/0x70 fs/debugfs/inode.c:784 ieee80211_sta_debugfs_remove+0x40/0x70 net/mac80211/debugfs_sta.c:1277 __sta_info_destroy_part2+0x32b/0x410 net/mac80211/sta_info.c:1613 __sta_info_destroy+0x44/0x50 net/mac80211/sta_info.c:1629 ieee80211_ibss_sta_expire net/mac80211/ibss.c:1221 [inline] ieee80211_sta_merge_ibss net/mac80211/ibss.c:1239 [inline] ieee80211_ibss_work+0x81d/0x1060 net/mac80211/ibss.c:1640 cfg80211_wiphy_work+0x29e/0x420 net/wireless/core.c:564 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 16715: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:351 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:377 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_lru_noprof+0x2a3/0x5f0 mm/slub.c:5029 __d_alloc+0x37/0x6f0 fs/dcache.c:1909 d_alloc_pseudo+0x21/0xc0 fs/dcache.c:2044 alloc_path_pseudo+0x107/0x220 fs/file_table.c:407 alloc_file_pseudo+0xa8/0x1e0 fs/file_table.c:423 __anon_inode_getfile fs/anon_inodes.c:164 [inline] __anon_inode_getfd fs/anon_inodes.c:281 [inline] anon_inode_getfd+0xc8/0x1f0 fs/anon_inodes.c:305 __btf_new_fd kernel/bpf/btf.c:8406 [inline] btf_new_fd+0x758/0x8f0 kernel/bpf/btf.c:8430 __sys_bpf+0xd2e/0xd90 kernel/bpf/syscall.c:6437 __do_sys_bpf kernel/bpf/syscall.c:6506 [inline] __se_sys_bpf kernel/bpf/syscall.c:6503 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6503 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 16714: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6509 [inline] kmem_cache_free+0x182/0x650 mm/slub.c:6636 dentry_kill+0x4d3/0x880 fs/dcache.c:845 finish_dput+0x1a/0x260 fs/dcache.c:1001 __fput+0x660/0xa50 fs/file_table.c:520 task_work_run+0x1d9/0x270 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880523248d0 which belongs to the cache dentry of size 312 The buggy address is located 208 bytes inside of freed 312-byte region [ffff8880523248d0, ffff888052324a08) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888052325a70 pfn:0x52324 head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888052325ed9 flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000240 ffff88801d6c4280 ffffea0001f7f190 ffffea0001dcd910 raw: ffff888052325a70 0000000200150014 00000000f5000000 ffff888052325ed9 head: 00fff00000000240 ffff88801d6c4280 ffffea0001f7f190 ffffea0001dcd910 head: ffff888052325a70 0000000200150014 00000000f5000000 ffff888052325ed9 head: 00fff00000000001 ffffffffffffff81 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 15438, tgid 15438 (syz-executor), ts 1067459687979 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab+0x7d/0x620 mm/slub.c:3462 new_slab mm/slub.c:3513 [inline] refill_objects+0x2d5/0x350 mm/slub.c:7418 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] kmem_cache_alloc_lru_noprof+0x383/0x5f0 mm/slub.c:5029 __d_alloc+0x37/0x6f0 fs/dcache.c:1909 d_alloc+0x4b/0x190 fs/dcache.c:1992 lookup_one_qstr_excl+0xd8/0x360 fs/namei.c:1806 __start_dirop fs/namei.c:2920 [inline] start_dirop+0x5c/0x90 fs/namei.c:2942 simple_start_creating+0xcc/0x110 fs/libfs.c:2308 debugfs_start_creating+0xca/0x1b0 fs/debugfs/inode.c:397 __debugfs_create_file+0x6f/0x400 fs/debugfs/inode.c:431 debugfs_create_file_full+0x3f/0x60 fs/debugfs/inode.c:463 ref_tracker_dir_debugfs+0x197/0x360 lib/ref_tracker.c:440 page last free pid 13074 tgid 13074 ts 768402472061 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962 __slab_free+0x274/0x2c0 mm/slub.c:5823 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4683 [inline] slab_alloc_node mm/slub.c:4996 [inline] kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010 alloc_filename fs/namei.c:147 [inline] do_getname+0x2e/0x250 fs/namei.c:187 getname include/linux/fs.h:2560 [inline] getname_maybe_null include/linux/fs.h:2567 [inline] class_filename_maybe_null_constructor include/linux/fs.h:2591 [inline] vfs_fstatat+0x45/0x170 fs/stat.c:368 __do_sys_newfstatat fs/stat.c:538 [inline] __se_sys_newfstatat fs/stat.c:532 [inline] __x64_sys_newfstatat+0x151/0x200 fs/stat.c:532 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888052324880: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff888052324900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888052324980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888052324a00: fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb ffff888052324a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================