================================================================== BUG: KASAN: use-after-free in __mutex_waiter_is_first kernel/locking/mutex.c:199 [inline] BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:694 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x1861/0x1b90 kernel/locking/mutex.c:776 Read of size 8 at addr ffff88802b6480a8 by task khidpd_04f55508/11751 CPU: 0 UID: 0 PID: 11751 Comm: khidpd_04f55508 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x156/0x4c9 mm/kasan/report.c:482 kasan_report+0xdf/0x1e0 mm/kasan/report.c:595 __mutex_waiter_is_first kernel/locking/mutex.c:199 [inline] __mutex_lock_common kernel/locking/mutex.c:694 [inline] __mutex_lock+0x1861/0x1b90 kernel/locking/mutex.c:776 l2cap_unregister_user+0x71/0x240 net/bluetooth/l2cap_core.c:1721 hidp_session_thread+0x459/0x680 net/bluetooth/hidp/core.c:1304 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2b648 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888140aaf640 dead000000000122 0000000000000000 raw: 0000000000000000 0000000800130013 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff888140aaf640 dead000000000122 0000000000000000 head: 0000000000000000 0000000800130013 00000000f5000000 0000000000000000 head: 00fff00000000002 ffffea0000ad9201 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3523, tgid 3523 (kworker/u8:11), ts 486252901907, free_ts 485990894683 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889 prep_new_page mm/page_alloc.c:1897 [inline] get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3962 __alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5250 alloc_slab_page mm/slub.c:3292 [inline] allocate_slab mm/slub.c:3481 [inline] new_slab+0xa6/0x6b0 mm/slub.c:3539 refill_objects+0x26b/0x400 mm/slub.c:7175 refill_sheaf mm/slub.c:2812 [inline] __pcs_replace_empty_main+0x1ab/0x660 mm/slub.c:4615 alloc_from_pcs mm/slub.c:4717 [inline] slab_alloc_node mm/slub.c:4851 [inline] kmem_cache_alloc_node_noprof+0x569/0x6f0 mm/slub.c:4918 kmalloc_reserve+0x148/0x350 net/core/skbuff.c:613 __alloc_skb+0x185/0x710 net/core/skbuff.c:713 skb_copy+0x1ca/0x3a0 net/core/skbuff.c:2195 mac80211_hwsim_tx_frame_no_nl.isra.0+0xbf6/0x1370 drivers/net/wireless/virtual/mac80211_hwsim.c:1891 mac80211_hwsim_tx_frame+0x1f6/0x2a0 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 __mac80211_hwsim_beacon_tx drivers/net/wireless/virtual/mac80211_hwsim.c:2281 [inline] mac80211_hwsim_beacon_tx+0x57e/0xa00 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __iterate_interfaces+0x2e6/0x650 net/mac80211/util.c:760 ieee80211_iterate_active_interfaces_atomic+0x71/0x1b0 net/mac80211/util.c:796 mac80211_hwsim_beacon+0x105/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 page last free pid 9631 tgid 9631 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0x7e1/0x10d0 mm/page_alloc.c:2978 hci_release_dev+0x4ef/0x630 net/bluetooth/hci_core.c:2777 bt_host_release+0x6a/0xb0 net/bluetooth/hci_sysfs.c:87 device_release+0xa4/0x240 drivers/base/core.c:2565 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3797 vhci_release+0x185/0x230 drivers/bluetooth/hci_vhci.c:691 __fput+0x3ff/0xb40 fs/file_table.c:469 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x8b8/0x2b60 kernel/exit.c:976 do_group_exit+0xd5/0x2a0 kernel/exit.c:1118 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034 arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x4a0 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x67c/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff88802b647f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802b648000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802b648080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802b648100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802b648180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================