kobject_add_internal failed for hci1:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci1: failed to register connection device ================================================================== BUG: KASAN: wild-memory-access in instrument_atomic_read include/linux/instrumented.h:72 [inline] BUG: KASAN: wild-memory-access in atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] BUG: KASAN: wild-memory-access in l2cap_chan_lock include/net/bluetooth/l2cap.h:865 [inline] BUG: KASAN: wild-memory-access in l2cap_conn_ready net/bluetooth/l2cap_core.c:1785 [inline] BUG: KASAN: wild-memory-access in l2cap_connect_cfm+0x4f4/0xd98 net/bluetooth/l2cap_core.c:8424 Read of size 4 at addr deacfffffffffc84 by task kworker/u5:0/47 CPU: 0 PID: 47 Comm: kworker/u5:0 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Workqueue: hci1 hci_rx_work Call trace: dump_backtrace+0x1c0/0x1ec 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+0xf4/0x15c lib/dump_stack.c:106 print_report+0x40/0x68 mm/kasan/report.c:423 kasan_report+0xa8/0xfc mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 __kasan_check_read+0x2c/0x3c mm/kasan/shadow.c:31 instrument_atomic_read include/linux/instrumented.h:72 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] l2cap_chan_lock include/net/bluetooth/l2cap.h:865 [inline] l2cap_conn_ready net/bluetooth/l2cap_core.c:1785 [inline] l2cap_connect_cfm+0x4f4/0xd98 net/bluetooth/l2cap_core.c:8424 hci_connect_cfm+0x98/0x130 include/net/bluetooth/hci_core.h:1817 le_conn_complete_evt+0xd30/0x1244 net/bluetooth/hci_event.c:5882 hci_le_conn_complete_evt+0x114/0x3f4 net/bluetooth/hci_event.c:5908 hci_le_meta_evt+0x2c0/0x4a0 net/bluetooth/hci_event.c:7101 hci_event_func net/bluetooth/hci_event.c:7412 [inline] hci_event_packet+0x6b8/0xf18 net/bluetooth/hci_event.c:7467 hci_rx_work+0x328/0xa84 net/bluetooth/hci_core.c:4109 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 ================================================================== Unable to handle kernel paging request at virtual address fbd51fffffffff90 KASAN: maybe wild-memory-access in range [0xdeacfffffffffc80-0xdeacfffffffffc87] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [fbd51fffffffff90] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 47 Comm: kworker/u5:0 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Workqueue: hci1 hci_rx_work pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline] pc : l2cap_chan_lock include/net/bluetooth/l2cap.h:865 [inline] pc : l2cap_conn_ready net/bluetooth/l2cap_core.c:1785 [inline] pc : l2cap_connect_cfm+0x500/0xd98 net/bluetooth/l2cap_core.c:8424 lr : instrument_atomic_read include/linux/instrumented.h:72 [inline] lr : atomic_read include/linux/atomic/atomic-instrumented.h:27 [inline] lr : l2cap_chan_lock include/net/bluetooth/l2cap.h:865 [inline] lr : l2cap_conn_ready net/bluetooth/l2cap_core.c:1785 [inline] lr : l2cap_connect_cfm+0x4f4/0xd98 net/bluetooth/l2cap_core.c:8424 sp : ffff80001cf67600 x29: ffff80001cf67680 x28: dfff800000000000 x27: 1fffe0001e910007 x26: 0000000000000001 x25: 0000000000000080 x24: deacfffffffffc84 x23: ffff0000dacad81a x22: dead000000000100 x21: ffff0000dacada60 x20: ffff0000f4880039 x19: ffff0000dacad800 x18: ffff800011b9bf60 x17: 1fffe00033eaa57e x16: ffff80000804309c x15: ffff80001521d000 x14: 0000000000000001 x13: 1ffff00002fc1b6c x12: 0000000000100000 x11: 000000000002da1d x10: ffff8000326fc000 x9 : 0000000000000007 x8 : 1bd59fffffffff90 x7 : 0000000000000004 x6 : ffff800008257984 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800008193d18 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: atomic_read include/linux/atomic/atomic-instrumented.h:28 [inline] l2cap_chan_lock include/net/bluetooth/l2cap.h:865 [inline] l2cap_conn_ready net/bluetooth/l2cap_core.c:1785 [inline] l2cap_connect_cfm+0x500/0xd98 net/bluetooth/l2cap_core.c:8424 hci_connect_cfm+0x98/0x130 include/net/bluetooth/hci_core.h:1817 le_conn_complete_evt+0xd30/0x1244 net/bluetooth/hci_event.c:5882 hci_le_conn_complete_evt+0x114/0x3f4 net/bluetooth/hci_event.c:5908 hci_le_meta_evt+0x2c0/0x4a0 net/bluetooth/hci_event.c:7101 hci_event_func net/bluetooth/hci_event.c:7412 [inline] hci_event_packet+0x6b8/0xf18 net/bluetooth/hci_event.c:7467 hci_rx_work+0x328/0xa84 net/bluetooth/hci_core.c:4109 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Code: 97ccce15 d343ff08 12000b09 11000d29 (38fc6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97ccce15 bl 0xffffffffff333854 4: d343ff08 lsr x8, x24, #3 8: 12000b09 and w9, w24, #0x7 c: 11000d29 add w9, w9, #0x3 * 10: 38fc6908 ldrsb w8, [x8, x28] <-- trapping instruction