kobject: kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory. Bluetooth: hci0: failed to register connection device ================================================================== BUG: KASAN: slab-use-after-free in l2cap_sock_new_connection_cb+0x1d4/0x284 net/bluetooth/l2cap_sock.c:1483 Read of size 8 at addr ffff0000c6934580 by task kworker/u9:6/6434 CPU: 0 UID: 0 PID: 6434 Comm: kworker/u9:6 Not tainted 6.12.0-rc7-syzkaller-g887407160d72 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: hci0 hci_rx_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 l2cap_sock_new_connection_cb+0x1d4/0x284 net/bluetooth/l2cap_sock.c:1483 l2cap_connect_cfm+0x2fc/0xe24 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm+0xa0/0x13c include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xa1c/0xf0c net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7495 hci_rx_work+0x324/0xaf0 net/bluetooth/hci_core.c:4031 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Allocated by task 6434: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:257 [inline] __do_kmalloc_node mm/slub.c:4264 [inline] __kmalloc_noprof+0x2a4/0x49c mm/slub.c:4276 kmalloc_noprof include/linux/slab.h:882 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2164 sk_alloc+0x44/0x3f0 net/core/sock.c:2217 bt_sock_alloc+0x4c/0x304 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1877 [inline] l2cap_sock_new_connection_cb+0xe4/0x284 net/bluetooth/l2cap_sock.c:1468 l2cap_connect_cfm+0x2fc/0xe24 net/bluetooth/l2cap_core.c:7261 hci_connect_cfm+0xa0/0x13c include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xa1c/0xf0c net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7495 hci_rx_work+0x324/0xaf0 net/bluetooth/hci_core.c:4031 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Freed by task 8675: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x64/0x8c mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kfree+0x184/0x47c mm/slub.c:4727 sk_prot_free net/core/sock.c:2200 [inline] __sk_destruct+0x4b8/0x74c net/core/sock.c:2292 sk_destruct net/core/sock.c:2307 [inline] __sk_free+0x388/0x4f4 net/core/sock.c:2318 sk_free+0x60/0xc8 net/core/sock.c:2329 sock_put include/net/sock.h:1888 [inline] l2cap_sock_kill+0x12c/0x234 net/bluetooth/l2cap_sock.c:1250 l2cap_sock_cleanup_listen+0xf8/0x290 net/bluetooth/l2cap_sock.c:1448 l2cap_sock_release+0x5c/0x1b4 net/bluetooth/l2cap_sock.c:1411 __sock_release net/socket.c:658 [inline] sock_close+0xa4/0x1e8 net/socket.c:1426 __fput+0x1bc/0x75c fs/file_table.c:431 ____fput+0x20/0x30 fs/file_table.c:459 task_work_run+0x230/0x2e0 kernel/task_work.c:239 get_signal+0x1350/0x152c kernel/signal.c:2691 do_signal+0x23c/0x391c arch/arm64/kernel/signal.c:1645 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 The buggy address belongs to the object at ffff0000c6934000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1408 bytes inside of freed 2048-byte region [ffff0000c6934000, ffff0000c6934800) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x106930 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 0000000000000000 dead000000000001 head: 0000000000000000 0000000000080008 00000001f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc31a4c01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c6934480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c6934500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c6934580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c6934600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c6934680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ------------[ cut here ]------------ ODEBUG: assert_init not available (active state 0) object: 00000000763689ec object type: timer_list hint: l2cap_chan_timeout+0x0/0x288 WARNING: CPU: 0 PID: 6434 at lib/debugobjects.c:517 debug_print_object+0x168/0x1e0 lib/debugobjects.c:514 Modules linked in: CPU: 0 UID: 0 PID: 6434 Comm: kworker/u9:6 Tainted: G B 6.12.0-rc7-syzkaller-g887407160d72 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: hci0 hci_rx_work pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_print_object+0x168/0x1e0 lib/debugobjects.c:514 lr : debug_print_object+0x168/0x1e0 lib/debugobjects.c:514 sp : ffff8000a33b7010 x29: ffff8000a33b7010 x28: dfff800000000000 x27: ffff700014676e10 x26: dfff800000000000 x25: dfff800000000000 x24: ffff0000cc507150 x23: ffff80008bb77ca0 x22: ffff80008a660d70 x21: ffff80008b646000 x20: 0000000000000000 x19: ffff80008bb77760 x18: 0000000000000008 x17: 0000000000000000 x16: ffff8000830ce3b0 x15: 0000000000000001 x14: 1fffe000366c6ce2 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000100000 x10: 0000000000070b12 x9 : 05250f6cef7b4500 x8 : 05250f6cef7b4500 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a33b6738 x4 : ffff80008f8fd220 x3 : ffff800080626cb0 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: debug_print_object+0x168/0x1e0 lib/debugobjects.c:514 (P) debug_print_object+0x168/0x1e0 lib/debugobjects.c:514 (L) debug_object_assert_init+0x318/0x3c8 lib/debugobjects.c:910 debug_timer_assert_init kernel/time/timer.c:846 [inline] debug_assert_init kernel/time/timer.c:891 [inline] __timer_delete+0xac/0x2f8 kernel/time/timer.c:1413 timer_delete+0x24/0x34 kernel/time/timer.c:1453 del_timer include/linux/timer.h:202 [inline] try_to_grab_pending kernel/workqueue.c:2064 [inline] work_grab_pending+0xb4/0x834 kernel/workqueue.c:2157 __cancel_work+0xac/0x29c kernel/workqueue.c:4308 cancel_delayed_work+0x24/0x38 kernel/workqueue.c:4396 l2cap_clear_timer include/net/bluetooth/l2cap.h:856 [inline] l2cap_chan_ready net/bluetooth/l2cap_core.c:1244 [inline] l2cap_le_start+0x8d4/0x1384 net/bluetooth/l2cap_core.c:1368 l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline] l2cap_connect_cfm+0x57c/0xe24 net/bluetooth/l2cap_core.c:7278 hci_connect_cfm+0xa0/0x13c include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xa1c/0xf0c net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7495 hci_rx_work+0x324/0xaf0 net/bluetooth/hci_core.c:4031 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 irq event stamp: 8607 hardirqs last enabled at (8607): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1517 [inline] hardirqs last enabled at (8607): [] finish_lock_switch+0xbc/0x1e4 kernel/sched/core.c:5082 hardirqs last disabled at (8606): [] __schedule+0x2bc/0x27d0 kernel/sched/core.c:6569 softirqs last enabled at (8186): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (8186): [] release_sock+0x154/0x1b8 net/core/sock.c:3635 softirqs last disabled at (8182): [] spin_lock_bh include/linux/spinlock.h:356 [inline] softirqs last disabled at (8182): [] release_sock+0x3c/0x1b8 net/core/sock.c:3624 ---[ end trace 0000000000000000 ]--- Unable to handle kernel paging request at virtual address dfff800000000038 KASAN: null-ptr-deref in range [0x00000000000001c0-0x00000000000001c7] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000038] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 6434 Comm: kworker/u9:6 Tainted: G B W 6.12.0-rc7-syzkaller-g887407160d72 #0 Tainted: [B]=BAD_PAGE, [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: hci0 hci_rx_work pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] pc : do_raw_spin_lock+0x80/0x334 kernel/locking/spinlock_debug.c:115 lr : __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] lr : _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 sp : ffff8000a33b7260 x29: ffff8000a33b72f0 x28: ffff8000a33b7440 x27: 1fffe000198a0e04 x26: 1fffe000198a0e00 x25: ffff700014676e88 x24: dfff800000000000 x23: ffff8000a33b7280 x22: dfff800000000000 x21: 0000000000000000 x20: 00000000000001c0 x19: 00000000000001c4 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008036ec34 x15: ffff6000198a0e21 x14: 1fffe000198a0e21 x13: ffff8000a33b8000 x12: ffff8000a33b7240 x11: ffff80008036ec34 x10: 1ffff00014676e50 x9 : 0000000000000038 x8 : f3f3f304f1f1f1f1 x7 : 0000000000000000 x6 : ffff8000895ab2a8 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : ffff80008bb77140 x0 : 00000000000001c0 Call trace: do_raw_spin_lock+0x80/0x334 kernel/locking/spinlock_debug.c:115 (P) __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] (L) _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 (L) __raw_spin_lock_bh include/linux/spinlock_api_smp.h:127 [inline] _raw_spin_lock_bh+0x50/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x74/0x11c net/core/sock.c:3614 lock_sock include/net/sock.h:1611 [inline] l2cap_sock_ready_cb+0x4c/0x130 net/bluetooth/l2cap_sock.c:1660 l2cap_chan_ready net/bluetooth/l2cap_core.c:1256 [inline] l2cap_le_start+0xa6c/0x1384 net/bluetooth/l2cap_core.c:1368 l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline] l2cap_connect_cfm+0x57c/0xe24 net/bluetooth/l2cap_core.c:7278 hci_connect_cfm+0xa0/0x13c include/net/bluetooth/hci_core.h:1960 le_conn_complete_evt+0xa1c/0xf0c net/bluetooth/hci_event.c:5758 hci_le_conn_complete_evt+0x114/0x404 net/bluetooth/hci_event.c:5784 hci_le_meta_evt+0x2a4/0x478 net/bluetooth/hci_event.c:7132 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x890/0x106c net/bluetooth/hci_event.c:7495 hci_rx_work+0x324/0xaf0 net/bluetooth/hci_core.c:4031 process_one_work+0x7bc/0x1600 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Code: d343fe69 f9001beb f8386948 aa0003f4 (38f86928) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: d343fe69 lsr x9, x19, #3 4: f9001beb str x11, [sp, #48] 8: f8386948 str x8, [x10, x24] c: aa0003f4 mov x20, x0 * 10: 38f86928 ldrsb w8, [x9, x24] <-- trapping instruction