Hello, syzbot found the following issue on: HEAD commit: df54f4a16f82 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=1201531f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=dde5a5ba8d41ee9e dashboard link: https://syzkaller.appspot.com/bug?extid=ea704362ec2bbf4ddcca compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/aa2eb06e0aea/disk-df54f4a1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/14728733d385/vmlinux-df54f4a1.xz kernel image: https://storage.googleapis.com/syzbot-assets/99816271407d/Image-df54f4a1.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ea704362ec2bbf4ddcca@xxxxxxxxxxxxxxxxxxxxxxxxx Bluetooth: Wrong link type (-22) Bluetooth: Unknown BR/EDR signaling command 0x0f Bluetooth: Wrong link type (-22) ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:96 [inline] BUG: KASAN: slab-use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] BUG: KASAN: slab-use-after-free in mgmt_device_connected+0x48/0x524 net/bluetooth/mgmt.c:9650 Write of size 8 at addr ffff0000fa89c838 by task kworker/u9:2/6409 CPU: 0 UID: 0 PID: 6409 Comm: kworker/u9:2 Not tainted 6.11.0-rc5-syzkaller-gdf54f4a16f82 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci3 hci_rx_work Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:119 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 kasan_check_range+0x268/0x2a8 mm/kasan/generic.c:189 __kasan_check_write+0x20/0x30 mm/kasan/shadow.c:37 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:71 [inline] mgmt_device_connected+0x48/0x524 net/bluetooth/mgmt.c:9650 l2cap_connect_req net/bluetooth/l2cap_core.c:4077 [inline] l2cap_bredr_sig_cmd net/bluetooth/l2cap_core.c:4772 [inline] l2cap_sig_channel net/bluetooth/l2cap_core.c:5543 [inline] l2cap_recv_frame+0x1324/0xc914 net/bluetooth/l2cap_core.c:6825 l2cap_recv_acldata+0x4ac/0x15f0 net/bluetooth/l2cap_core.c:7514 hci_acldata_packet net/bluetooth/hci_core.c:3785 [inline] hci_rx_work+0x2b8/0xa80 net/bluetooth/hci_core.c:4022 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 6409: 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:370 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __kmalloc_cache_noprof+0x244/0x374 mm/slub.c:4189 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] __hci_conn_add+0x25c/0x13cc net/bluetooth/hci_conn.c:934 hci_conn_add_unset+0x78/0xf8 net/bluetooth/hci_conn.c:1043 hci_conn_request_evt+0x4fc/0xb08 net/bluetooth/hci_event.c:3288 hci_event_func net/bluetooth/hci_event.c:7446 [inline] hci_event_packet+0x8dc/0x106c net/bluetooth/hci_event.c:7498 hci_rx_work+0x318/0xa80 net/bluetooth/hci_core.c:4017 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Freed by task 6412: 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+0x128/0x180 mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x154/0x3e0 mm/slub.c:4594 bt_link_release+0x20/0x30 net/bluetooth/hci_sysfs.c:16 device_release+0x8c/0x1ac kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:737 put_device drivers/base/core.c:3790 [inline] device_unregister+0x3c/0xcc drivers/base/core.c:3913 hci_conn_del_sysfs+0xf0/0x170 net/bluetooth/hci_sysfs.c:86 hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline] hci_conn_del+0x72c/0xaa0 net/bluetooth/hci_conn.c:1162 hci_conn_failed+0x244/0x350 net/bluetooth/hci_conn.c:1266 hci_abort_conn_sync+0x500/0xbb0 net/bluetooth/hci_sync.c:5545 abort_conn_sync+0x224/0x25c net/bluetooth/hci_conn.c:2917 hci_cmd_sync_work+0x1cc/0x34c net/bluetooth/hci_sync.c:328 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:541 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:551 insert_work+0x54/0x2d4 kernel/workqueue.c:2185 __queue_work+0xe20/0x1308 kernel/workqueue.c:2341 delayed_work_timer_fn+0x74/0x90 kernel/workqueue.c:2487 call_timer_fn+0x1b4/0x8e8 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1838 [inline] __run_timers kernel/time/timer.c:2417 [inline] __run_timer_base+0x59c/0x7b4 kernel/time/timer.c:2428 run_timer_base kernel/time/timer.c:2437 [inline] run_timer_softirq+0xcc/0x194 kernel/time/timer.c:2447 handle_softirqs+0x2e4/0xbfc kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 The buggy address belongs to the object at ffff0000fa89c000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 2104 bytes inside of freed 8192-byte region [ffff0000fa89c000, ffff0000fa89e000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13a898 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 05ffc00000000040 ffff0000c0002280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000020002 00000001fdffffff 0000000000000000 head: 05ffc00000000040 ffff0000c0002280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000020002 00000001fdffffff 0000000000000000 head: 05ffc00000000003 fffffdffc3ea2601 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000fa89c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000fa89c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000fa89c800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000fa89c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000fa89c900: 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 dfff800000000064 KASAN: null-ptr-deref in range [0x0000000000000320-0x0000000000000327] 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 [dfff800000000064] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 6409 Comm: kworker/u9:2 Tainted: G B 6.11.0-rc5-syzkaller-gdf54f4a16f82 #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: hci3 hci_rx_work pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : l2cap_send_cmd+0x484/0x770 net/bluetooth/l2cap_core.c:964 lr : l2cap_send_cmd+0x478/0x770 net/bluetooth/l2cap_core.c:964 sp : ffff8000ab0c71a0 x29: ffff8000ab0c71c0 x28: dfff800000000000 x27: ffff0000ccc2c90e x26: ffff0000ccc2c90c x25: 0000000000000010 x24: 0000000000000000 x23: ffff0000ce726010 x22: ffff0000c8eec000 x21: 0000000000000322 x20: ffff0000c5fd7640 x19: ffff0000ce726000 x18: 1fffe00036799fe6 x17: ffff80008a4ba0fc x16: ffff800080a863f4 x15: 0000000000000001 x14: 1fffe00019985922 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000100000 x10: 0000000000032ad3 x9 : ffff800093f02100 x8 : 0000000000000064 x7 : 0000000200090000 x6 : 0000000200090000 x5 : ffff0000ccc2c918 x4 : ffff8000ab0c7888 x3 : ffff80008a4ab374 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: l2cap_send_cmd+0x484/0x770 net/bluetooth/l2cap_core.c:964 l2cap_connect net/bluetooth/l2cap_core.c:4034 [inline] l2cap_connect_req net/bluetooth/l2cap_core.c:4080 [inline] l2cap_bredr_sig_cmd net/bluetooth/l2cap_core.c:4772 [inline] l2cap_sig_channel net/bluetooth/l2cap_core.c:5543 [inline] l2cap_recv_frame+0x25c8/0xc914 net/bluetooth/l2cap_core.c:6825 l2cap_recv_acldata+0x4ac/0x15f0 net/bluetooth/l2cap_core.c:7514 hci_acldata_packet net/bluetooth/hci_core.c:3785 [inline] hci_rx_work+0x2b8/0xa80 net/bluetooth/hci_core.c:4022 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x978/0xec4 kernel/workqueue.c:3389 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Code: 9769fc8a f94002a8 910c8915 d343fea8 (38fc6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 9769fc8a bl 0xfffffffffda7f228 4: f94002a8 ldr x8, [x21] 8: 910c8915 add x21, x8, #0x322 c: d343fea8 lsr x8, x21, #3 * 10: 38fc6908 ldrsb w8, [x8, x28] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
