Bluetooth: hci2: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci2: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci3: unexpected cc 0x0c23 length: 249 > 4 ============================= WARNING: suspicious RCU usage 6.16.0-rc4-next-20250704 #1 Not tainted ----------------------------- fs/proc/proc_sysctl.c:934 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz-executor.1/282: #0: ffff88800f834400 (sb_writers#4){.+.+}-{0:0}, at: path_openat+0x1cd3/0x2880 #1: ffff88800ba66618 (&sb->s_type->i_mutex_key#8){++++}-{4:4}, at: path_openat+0x1308/0x2880 #2: ffff8880187d2828 (&lockref->lock){+.+.}-{3:3}, at: d_alloc_parallel+0xf97/0x1330 stack backtrace: CPU: 0 UID: 0 PID: 282 Comm: syz-executor.1 Not tainted 6.16.0-rc4-next-20250704 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 lockdep_rcu_suspicious+0x152/0x1c0 proc_sys_compare+0x28a/0x340 d_same_name+0x229/0x2e0 d_alloc_parallel+0x7c1/0x1330 lookup_open.isra.0+0x64f/0x1530 path_openat+0xc26/0x2880 do_filp_open+0x1e8/0x450 do_sys_openat2+0x104/0x1b0 __x64_sys_openat+0x142/0x200 do_syscall_64+0xbf/0x360 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f532df5ba04 Code: 84 00 00 00 00 00 44 89 54 24 0c e8 96 f9 ff ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 c8 f9 ff ff 8b 44 RSP: 002b:00007ffd14a1bbf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007f532df5ba04 RDX: 0000000000080001 RSI: 00007f532e001f61 RDI: 00000000ffffff9c RBP: 00007f532e001f61 R08: 0000000000000000 R09: 00007ffd14a1bbe0 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080001 R13: 00007ffd14a1bc90 R14: 0000000000000000 R15: 00000000000000f8 Bluetooth: hci4: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci3: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci4: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci4: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci5: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci5: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci5: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci4: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci6: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci7: unexpected cc 0x0c03 length: 249 > 1 Bluetooth: hci7: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci4: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci6: unexpected cc 0x1003 length: 249 > 9 Bluetooth: hci6: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci5: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci7: unexpected cc 0x1001 length: 249 > 9 Bluetooth: hci6: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci5: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci7: unexpected cc 0x0c23 length: 249 > 4 Bluetooth: hci6: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci7: unexpected cc 0x0c38 length: 249 > 2 Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci5: command tx timeout Bluetooth: hci7: command tx timeout Bluetooth: hci6: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci6: command tx timeout Bluetooth: hci5: command tx timeout Bluetooth: hci7: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci6: command tx timeout Bluetooth: hci7: command tx timeout Bluetooth: hci5: command tx timeout Bluetooth: hci0: command tx timeout Bluetooth: hci1: command tx timeout Bluetooth: hci2: command tx timeout Bluetooth: hci3: command tx timeout Bluetooth: hci4: command tx timeout Bluetooth: hci6: command tx timeout Bluetooth: hci5: command tx timeout Bluetooth: hci7: command tx timeout