================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x77/0x1f80 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff8880776d00b0 by task kworker/u5:7/3582 CPU: 1 PID: 3582 Comm: kworker/u5:7 Not tainted 6.1.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: hci3 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 __lock_acquire+0x77/0x1f80 kernel/locking/lockdep.c:4919 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x66/0x100 net/core/sock.c:3488 lock_sock include/net/sock.h:1748 [inline] l2cap_sock_recv_cb+0x51/0x4e0 net/bluetooth/l2cap_sock.c:1522 l2cap_conless_channel net/bluetooth/l2cap_core.c:7817 [inline] l2cap_recv_frame+0x12ba/0x8bd0 net/bluetooth/l2cap_core.c:7870 hci_acldata_packet net/bluetooth/hci_core.c:3897 [inline] hci_rx_work+0x363/0xce0 net/bluetooth/hci_core.c:4134 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 8427: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xb2/0x230 mm/slab_common.c:968 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xe0/0x200 net/core/sock.c:2047 sk_alloc+0x36/0x350 net/core/sock.c:2100 bt_sock_alloc+0x37/0x130 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1903 [inline] l2cap_sock_create+0x11e/0x2b0 net/bluetooth/l2cap_sock.c:1943 bt_sock_create+0x159/0x220 net/bluetooth/af_bluetooth.c:132 __sock_create+0x488/0x910 net/socket.c:1550 sock_create net/socket.c:1601 [inline] __sys_socket_create net/socket.c:1638 [inline] __sys_socket+0x136/0x3a0 net/socket.c:1666 __do_sys_socket net/socket.c:1679 [inline] __se_sys_socket net/socket.c:1677 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1677 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 8426: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 sk_prot_free net/core/sock.c:2083 [inline] __sk_destruct+0x473/0x5f0 net/core/sock.c:2169 l2cap_sock_release+0x157/0x1d0 net/bluetooth/l2cap_sock.c:1451 __sock_release net/socket.c:654 [inline] sock_close+0xcd/0x230 net/socket.c:1400 __fput+0x3b7/0x890 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 queue_work_on+0x14b/0x250 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] afs_queue_server_manager fs/afs/server.c:613 [inline] afs_purge_servers+0x145/0x370 fs/afs/server.c:627 afs_net_exit+0x50/0xa0 fs/afs/main.c:157 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x6ce/0xb60 net/core/net_namespace.c:604 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3d0 kernel/workqueue.c:1361 __queue_work+0xb4b/0xf90 kernel/workqueue.c:1520 queue_work_on+0x14b/0x250 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] afs_queue_cell_manager fs/afs/cell.c:522 [inline] afs_cell_purge+0x185/0x3a0 fs/afs/cell.c:948 afs_net_exit+0x48/0xa0 fs/afs/main.c:156 ops_exit_list net/core/net_namespace.c:172 [inline] cleanup_net+0x6ce/0xb60 net/core/net_namespace.c:604 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff8880776d0000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 176 bytes inside of 2048-byte region [ffff8880776d0000, ffff8880776d0800) The buggy address belongs to the physical page: page:ffffea0001ddb400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x776d0 head:ffffea0001ddb400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00015e6e00 dead000000000002 ffff888012442000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3612, tgid 3612 (kworker/0:4), ts 61852282827, free_ts 61793102703 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0xa0/0x220 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:446 [inline] __alloc_skb+0x135/0x670 net/core/skbuff.c:515 skb_copy+0x127/0x820 net/core/skbuff.c:1732 mac80211_hwsim_tx_frame_no_nl+0x10f4/0x1a70 drivers/net/wireless/mac80211_hwsim.c:1724 mac80211_hwsim_tx+0x18d7/0x2600 drivers/net/wireless/mac80211_hwsim.c:1935 drv_tx net/mac80211/driver-ops.h:35 [inline] ieee80211_tx_frags+0x3d8/0x890 net/mac80211/tx.c:1766 __ieee80211_tx+0x21b/0x4a0 net/mac80211/tx.c:1820 ieee80211_tx+0x32d/0x460 net/mac80211/tx.c:2000 __ieee80211_subif_start_xmit+0x10d5/0x33f0 net/mac80211/tx.c:4265 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586 put_cpu_partial+0x17b/0x250 mm/slub.c:2662 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443 __alloc_skb+0xde/0x670 net/core/skbuff.c:505 alloc_skb include/linux/skbuff.h:1271 [inline] alloc_skb_with_frags+0xa4/0x740 net/core/skbuff.c:6168 sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2747 sock_alloc_send_skb include/net/sock.h:1918 [inline] mld_newpack+0x1c0/0xa90 net/ipv6/mcast.c:1748 add_grhead net/ipv6/mcast.c:1851 [inline] add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1989 mld_send_cr net/ipv6/mcast.c:2115 [inline] mld_ifc_work+0x68f/0xc90 net/ipv6/mcast.c:2653 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 Memory state around the buggy address: ffff8880776cff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880776d0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880776d0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880776d0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880776d0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================