Bluetooth: hci2: Opcode 0x0c1a failed: -4 Bluetooth: hci3: Opcode 0x0c1a failed: -4 Bluetooth: hci3: Opcode 0x0406 failed: -4 ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: lib/refcount.c:28 at refcount_warn_saturate+0xc9/0x120 lib/refcount.c:28, CPU#0: syz.5.536/8067 Modules linked in: CPU: 0 UID: 0 PID: 8067 Comm: syz.5.536 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:refcount_warn_saturate+0xc9/0x120 lib/refcount.c:28 Code: 5d e9 5b 1f 12 fd e8 56 1f 12 fd 48 8d 3d cf 64 e5 0b 67 48 0f b9 3a 5b 5d e9 43 1f 12 fd e8 3e 1f 12 fd 48 8d 3d c7 64 e5 0b <67> 48 0f b9 3a 5b 5d e9 2b 1f 12 fd e8 26 1f 12 fd 48 8d 3d bf 64 RSP: 0018:ffffc900048f72d8 EFLAGS: 00010283 RAX: 0000000000009694 RBX: 0000000000000003 RCX: ffffc90029d3e000 RDX: 0000000000080000 RSI: ffffffff84acc752 RDI: ffffffff90922c20 RBP: ffff88803e394478 R08: 0000000000000005 R09: 0000000000000004 R10: 0000000000000003 R11: 0000000000000001 R12: ffff8880254c2400 R13: ffff88803e394478 R14: ffffffff85e68720 R15: ffffffff906bf9a0 FS: 00007fa234c746c0(0000) GS:ffff8880d68f5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f109304cf98 CR3: 000000002c4df000 CR4: 0000000000352ef0 Call Trace: __refcount_sub_and_test include/linux/refcount.h:400 [inline] __refcount_dec_and_test include/linux/refcount.h:432 [inline] refcount_dec_and_test include/linux/refcount.h:450 [inline] kref_put include/linux/kref.h:64 [inline] klist_dec_and_del lib/klist.c:206 [inline] klist_put+0x11b/0x1b0 lib/klist.c:217 klist_del lib/klist.c:230 [inline] klist_remove+0x13f/0x2e0 lib/klist.c:249 device_move+0x12d/0x1160 drivers/base/core.c:4615 hci_conn_del_sysfs+0xaa/0x1a0 net/bluetooth/hci_sysfs.c:75 hci_conn_cleanup net/bluetooth/hci_conn.c:173 [inline] hci_conn_del+0x680/0x11d0 net/bluetooth/hci_conn.c:1234 hci_abort_conn_sync+0x76a/0xb20 net/bluetooth/hci_sync.c:5721 hci_disconnect_all_sync.constprop.0+0x104/0x3c0 net/bluetooth/hci_sync.c:5744 hci_suspend_sync+0x821/0xb40 net/bluetooth/hci_sync.c:6220 hci_suspend_dev+0x331/0x560 net/bluetooth/hci_core.c:2849 hci_suspend_notifier+0x2e0/0x340 net/bluetooth/hci_core.c:2420 notifier_call_chain+0xbc/0x3e0 kernel/notifier.c:85 notifier_call_chain_robust kernel/notifier.c:120 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:345 [inline] blocking_notifier_call_chain_robust+0xc8/0x160 kernel/notifier.c:333 pm_notifier_call_chain_robust+0x27/0x60 kernel/power/main.c:172 snapshot_open+0x189/0x2b0 kernel/power/user.c:77 misc_open+0x26d/0x450 drivers/char/misc.c:163 chrdev_open+0x234/0x6a0 fs/char_dev.c:414 do_dentry_open+0x748/0x1590 fs/open.c:962 vfs_open+0x82/0x3f0 fs/open.c:1094 do_open fs/namei.c:4628 [inline] path_openat+0x2078/0x3140 fs/namei.c:4787 do_filp_open+0x20b/0x470 fs/namei.c:4814 do_sys_openat2+0x121/0x290 fs/open.c:1430 do_sys_open fs/open.c:1436 [inline] __do_sys_openat fs/open.c:1452 [inline] __se_sys_openat fs/open.c:1447 [inline] __x64_sys_openat+0x174/0x210 fs/open.c:1447 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa233d8f7c9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa234c74038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa233fe6180 RCX: 00007fa233d8f7c9 RDX: 0000000000000e00 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007fa233e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa233fe6218 R14: 00007fa233fe6180 R15: 00007ffdac98a6b8 ---------------- Code disassembly (best guess): 0: 5d pop %rbp 1: e9 5b 1f 12 fd jmp 0xfd121f61 6: e8 56 1f 12 fd call 0xfd121f61 b: 48 8d 3d cf 64 e5 0b lea 0xbe564cf(%rip),%rdi # 0xbe564e1 12: 67 48 0f b9 3a ud1 (%edx),%rdi 17: 5b pop %rbx 18: 5d pop %rbp 19: e9 43 1f 12 fd jmp 0xfd121f61 1e: e8 3e 1f 12 fd call 0xfd121f61 23: 48 8d 3d c7 64 e5 0b lea 0xbe564c7(%rip),%rdi # 0xbe564f1 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 5b pop %rbx 30: 5d pop %rbp 31: e9 2b 1f 12 fd jmp 0xfd121f61 36: e8 26 1f 12 fd call 0xfd121f61 3b: 48 rex.W 3c: 8d .byte 0x8d 3d: 3d .byte 0x3d 3e: bf .byte 0xbf 3f: 64 fs