BUG: sleeping function called from invalid context at net/core/sock.c:3495 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 4396, name: kworker/u5:2 preempt_count: 1, expected: 0 RCU nest depth: 0, expected: 0 6 locks held by kworker/u5:2/4396: #0: ffff0000d14bf938 ((wq_completion)hci1#2){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff800020d37c20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff0000cabcc078 (&hdev->lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x98/0x90c net/bluetooth/hci_event.c:5018 #3: ffff800017885ba8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_connect_cfm include/net/bluetooth/hci_core.h:1805 [inline] #3: ffff800017885ba8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_sync_conn_complete_evt+0x3f8/0x90c net/bluetooth/hci_event.c:5104 #4: ffff0000c9b6c020 (&conn->lock#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #4: ffff0000c9b6c020 (&conn->lock#2){+.+.}-{2:2}, at: sco_conn_ready net/bluetooth/sco.c:1297 [inline] #4: ffff0000c9b6c020 (&conn->lock#2){+.+.}-{2:2}, at: sco_connect_cfm+0x25c/0x8fc net/bluetooth/sco.c:1382 #5: ffff0000efde1130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1792 [inline] #5: ffff0000efde1130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_conn_ready net/bluetooth/sco.c:1310 [inline] #5: ffff0000efde1130 (sk_lock-AF_BLUETOOTH-BTPROTO_SCO){+.+.}-{0:0}, at: sco_connect_cfm+0x3cc/0x8fc net/bluetooth/sco.c:1382 Preemption disabled at: [] spin_lock include/linux/spinlock.h:351 [inline] [] sco_conn_ready net/bluetooth/sco.c:1297 [inline] [] sco_connect_cfm+0x25c/0x8fc net/bluetooth/sco.c:1382 CPU: 0 PID: 4396 Comm: kworker/u5:2 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: hci1 hci_rx_work Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 __might_resched+0x350/0x4cc kernel/sched/core.c:9966 __might_sleep+0x94/0x110 kernel/sched/core.c:9895 lock_sock_nested+0x80/0x130 net/core/sock.c:3495 lock_sock include/net/sock.h:1792 [inline] sco_conn_ready net/bluetooth/sco.c:1310 [inline] sco_connect_cfm+0x3cc/0x8fc net/bluetooth/sco.c:1382 hci_connect_cfm include/net/bluetooth/hci_core.h:1808 [inline] hci_sync_conn_complete_evt+0x460/0x90c net/bluetooth/hci_event.c:5104 hci_event_func net/bluetooth/hci_event.c:7381 [inline] hci_event_packet+0x6f4/0xf08 net/bluetooth/hci_event.c:7433 hci_rx_work+0x324/0xaa0 net/bluetooth/hci_core.c:4083 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0xf0/0x6544 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff0000efde10b0 by task kworker/u5:2/4396 CPU: 0 PID: 4396 Comm: kworker/u5:2 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: hci1 hci_rx_work Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0x100 mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __lock_acquire+0xf0/0x6544 kernel/locking/lockdep.c:4919 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x88/0x130 net/core/sock.c:3496 lock_sock include/net/sock.h:1792 [inline] sco_conn_ready net/bluetooth/sco.c:1310 [inline] sco_connect_cfm+0x3cc/0x8fc net/bluetooth/sco.c:1382 hci_connect_cfm include/net/bluetooth/hci_core.h:1808 [inline] hci_sync_conn_complete_evt+0x460/0x90c net/bluetooth/hci_event.c:5104 hci_event_func net/bluetooth/hci_event.c:7381 [inline] hci_event_packet+0x6f4/0xf08 net/bluetooth/hci_event.c:7433 hci_rx_work+0x324/0xaa0 net/bluetooth/hci_core.c:4083 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Allocated by task 4548: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x28/0x34 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xec/0x178 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2052 sk_alloc+0x44/0x390 net/core/sock.c:2108 bt_sock_alloc+0x4c/0x140 net/bluetooth/af_bluetooth.c:148 sco_sock_alloc net/bluetooth/sco.c:520 [inline] sco_sock_create+0xbc/0x338 net/bluetooth/sco.c:551 bt_sock_create+0x14c/0x24c net/bluetooth/af_bluetooth.c:132 __sock_create+0x4b0/0x8b4 net/socket.c:1550 sock_create net/socket.c:1606 [inline] __sys_socket_create net/socket.c:1643 [inline] __sys_socket+0xc0/0x1ac net/socket.c:1671 __do_sys_socket net/socket.c:1684 [inline] __se_sys_socket net/socket.c:1682 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1682 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 4548: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x3c/0x60 mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1ec mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xc0/0x224 mm/slub.c:3700 kfree+0xd0/0x1ac mm/slab_common.c:988 sk_prot_free net/core/sock.c:2091 [inline] __sk_destruct+0x4dc/0x780 net/core/sock.c:2177 sk_destruct net/core/sock.c:2192 [inline] __sk_free+0x320/0x430 net/core/sock.c:2203 sk_free+0x60/0xc8 net/core/sock.c:2214 sock_put include/net/sock.h:2072 [inline] sco_sock_kill+0xfc/0x1b4 net/bluetooth/sco.c:440 sco_sock_release+0x1f8/0x2c4 net/bluetooth/sco.c:1279 __sock_release net/socket.c:654 [inline] sock_close+0xb4/0x1f8 net/socket.c:1400 __fput+0x1bc/0x7c0 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2038/0x2b28 arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000efde1000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 176 bytes inside of 2048-byte region [ffff0000efde1000, ffff0000efde1800) The buggy address belongs to the physical page: page:00000000282507d7 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12fde0 head:00000000282507d7 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002900 raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000efde0f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000efde1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000efde1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000efde1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000efde1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000000 KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000000] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 4396 Comm: kworker/u5:2 Tainted: G B W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: hci1 hci_rx_work pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : apparmor_sk_clone_security+0xec/0x398 security/apparmor/lsm.c:845 lr : apparmor_sk_clone_security+0xcc/0x398 security/apparmor/lsm.c:843 sp : ffff800020d37780 x29: ffff800020d37780 x28: 1fffe0001936d809 x27: 1ffff000041a6f04 x26: dfff800000000000 x25: 0000000000000005 x24: 1fffe0001b5d28a0 x23: dfff800000000000 x22: dfff800000000000 x21: 0000000000000000 x20: 0000000000000000 x19: ffff0000dae94500 x18: 0000000059717912 x17: ffff800008205f1c x16: ffff8000082e8848 x15: ffff800010b54188 x14: ffff800010b712e0 x13: ffff80000802a690 x12: 0000000000ff0100 x11: ff0080000a5126e0 x10: 0000000000000000 x9 : ffff80000a5126e0 x8 : 0000000000000000 x7 : ffffffffffffffff x6 : ffff800010b4171c x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80000a51265c x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: apparmor_sk_clone_security+0xec/0x398 security/apparmor/lsm.c:845 security_sk_clone+0x58/0x9c security/security.c:2341 sco_sock_init net/bluetooth/sco.c:503 [inline] sco_conn_ready net/bluetooth/sco.c:1320 [inline] sco_connect_cfm+0x564/0x8fc net/bluetooth/sco.c:1382 hci_connect_cfm include/net/bluetooth/hci_core.h:1808 [inline] hci_sync_conn_complete_evt+0x460/0x90c net/bluetooth/hci_event.c:5104 hci_event_func net/bluetooth/hci_event.c:7381 [inline] hci_event_packet+0x6f4/0xf08 net/bluetooth/hci_event.c:7433 hci_rx_work+0x324/0xaa0 net/bluetooth/hci_core.c:4083 process_one_work+0x7f4/0x13a8 kernel/workqueue.c:2292 worker_thread+0x8c8/0xfbc kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Code: 710006df 5400104b 977e3d62 d343fe88 (38776908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 710006df cmp w22, #0x1 4: 5400104b b.lt 0x20c // b.tstop 8: 977e3d62 bl 0xfffffffffdf8f590 c: d343fe88 lsr x8, x20, #3 * 10: 38776908 ldrb w8, [x8, x23] <-- trapping instruction