Bluetooth: hci5: Opcode 0x0406 failed: -4 Bluetooth: hci2: Opcode 0x0c1a failed: -4 Bluetooth: hci2: 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#3: syz.2.1785/12184 Modules linked in: CPU: 3 UID: 0 PID: 12184 Comm: syz.2.1785 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP 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 2b ef 11 fd e8 26 ef 11 fd 48 8d 3d ef 36 e5 0b 67 48 0f b9 3a 5b 5d e9 13 ef 11 fd e8 0e ef 11 fd 48 8d 3d e7 36 e5 0b <67> 48 0f b9 3a 5b 5d e9 fb ee 11 fd e8 f6 ee 11 fd 48 8d 3d df 36 RSP: 0018:ffffc9000dda72d8 EFLAGS: 00010283 RAX: 0000000000011120 RBX: 0000000000000003 RCX: ffffc9000c402000 RDX: 0000000000080000 RSI: ffffffff84ad0d42 RDI: ffffffff90924430 RBP: ffff88803279c078 R08: 0000000000000005 R09: 0000000000000004 R10: 0000000000000003 R11: 0000000000000001 R12: ffff888063bbb800 R13: ffff88803279c078 R14: ffffffff85e6ff30 R15: ffffffff906c0f20 FS: 00007fe2637666c0(0000) GS:ffff8880d6bf1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556e39d808 CR3: 0000000055d83000 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:5722 hci_disconnect_all_sync.constprop.0+0x104/0x3c0 net/bluetooth/hci_sync.c:5745 hci_suspend_sync+0x821/0xb40 net/bluetooth/hci_sync.c:6221 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:4637 [inline] path_openat+0x2078/0x3140 fs/namei.c:4796 do_filp_open+0x20b/0x470 fs/namei.c:4823 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: 0033:0x7fe26298f7c9 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:00007fe263766038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fe262be6090 RCX: 00007fe26298f7c9 RDX: 0000000000002000 RSI: 0000200000000680 RDI: ffffffffffffff9c RBP: 00007fe262a13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000019 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe262be6128 R14: 00007fe262be6090 R15: 00007ffc6566d758 ---------------- Code disassembly (best guess): 0: 5d pop %rbp 1: e9 2b ef 11 fd jmp 0xfd11ef31 6: e8 26 ef 11 fd call 0xfd11ef31 b: 48 8d 3d ef 36 e5 0b lea 0xbe536ef(%rip),%rdi # 0xbe53701 12: 67 48 0f b9 3a ud1 (%edx),%rdi 17: 5b pop %rbx 18: 5d pop %rbp 19: e9 13 ef 11 fd jmp 0xfd11ef31 1e: e8 0e ef 11 fd call 0xfd11ef31 23: 48 8d 3d e7 36 e5 0b lea 0xbe536e7(%rip),%rdi # 0xbe53711 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 5b pop %rbx 30: 5d pop %rbp 31: e9 fb ee 11 fd jmp 0xfd11ef31 36: e8 f6 ee 11 fd call 0xfd11ef31 3b: 48 rex.W 3c: 8d .byte 0x8d 3d: 3d .byte 0x3d 3e: df 36 fbstp (%rsi)