Hello, syzbot found the following issue on: HEAD commit: 7a934f4bd7d6 Merge tag 'riscv-for-linus-6.3-rc7' of git://.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17444c3fc80000 kernel config: https://syzkaller.appspot.com/x/.config?x=759d5e665e47a55 dashboard link: https://syzkaller.appspot.com/bug?extid=5067576ebe3f37f2cca4 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/df89fd1d6599/disk-7a934f4b.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e76edf369cbd/vmlinux-7a934f4b.xz kernel image: https://storage.googleapis.com/syzbot-assets/23ad78b092d3/bzImage-7a934f4b.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5067576ebe3f37f2cca4@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================== WARNING: bad unlock balance detected! 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #0 Not tainted ------------------------------------- kworker/u5:0/19118 is trying to release lock (&conn->chan_lock) at: [<ffffffff89aea4c5>] l2cap_bredr_sig_cmd+0x875/0x9cb0 net/bluetooth/l2cap_core.c:5748 but there are no more locks to release! other info that might help us debug this: 2 locks held by kworker/u5:0/19118: #0: ffff88804175e938 ((wq_completion)hci2#2){+.+.}-{0:0}, at: process_one_work+0x77e/0x10e0 kernel/workqueue.c:2363 #1: ffffc90005077d20 ((work_completion)(&hdev->rx_work)){+.+.}-{0:0}, at: process_one_work+0x7c8/0x10e0 kernel/workqueue.c:2365 stack backtrace: CPU: 0 PID: 19118 Comm: kworker/u5:0 Not tainted 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: hci2 hci_rx_work Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_unlock_imbalance_bug+0x252/0x2c0 kernel/locking/lockdep.c:5109 __lock_release kernel/locking/lockdep.c:5346 [inline] lock_release+0x59d/0x9d0 kernel/locking/lockdep.c:5689 __mutex_unlock_slowpath+0xe2/0x750 kernel/locking/mutex.c:907 l2cap_bredr_sig_cmd+0x875/0x9cb0 net/bluetooth/l2cap_core.c:5748 l2cap_sig_channel net/bluetooth/l2cap_core.c:6507 [inline] l2cap_recv_frame+0xa5a/0x8990 net/bluetooth/l2cap_core.c:7786 hci_acldata_packet net/bluetooth/hci_core.c:3828 [inline] hci_rx_work+0x58e/0xa90 net/bluetooth/hci_core.c:4063 process_one_work+0x8a0/0x10e0 kernel/workqueue.c:2390 worker_thread+0xa63/0x1210 kernel/workqueue.c:2537 kthread+0x270/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Bluetooth: hci2: ACL packet for unknown connection handle 173 Bluetooth: hci2: ACL packet for unknown connection handle 173 Bluetooth: Unexpected start frame (len 16) Bluetooth: Unexpected start frame (len 16) Bluetooth: Unexpected start frame (len 16) Bluetooth: hci4: Received unexpected HCI Event 0x00 Bluetooth: hci4: Received unexpected HCI Event 0x00 Bluetooth: hci4: Received unexpected HCI Event 0x00 Bluetooth: Unexpected start frame (len 20) Bluetooth: Unexpected start frame (len 20) Bluetooth: Unexpected start frame (len 28) Bluetooth: hci1: Malformed Event: 0x02 Bluetooth: Unexpected start frame (len 28) Bluetooth: Unexpected start frame (len 28) Bluetooth: Unexpected start frame (len 28) Bluetooth: Unexpected start frame (len 28) Bluetooth: hci2: command 0x0419 tx timeout Bluetooth: hci4: ACL packet for unknown connection handle 3017 Bluetooth: hci4: ACL packet for unknown connection handle 3017 Bluetooth: hci4: ACL packet for unknown connection handle 3017 Bluetooth: hci4: ACL packet for unknown connection handle 2303 Bluetooth: hci5: ACL packet for unknown connection handle 0 Bluetooth: Frame is too long (len 78, expected len 4) Bluetooth: Frame is too long (len 78, expected len 4) Bluetooth: Frame is too long (len 78, expected len 4) Bluetooth: Frame is too long (len 78, expected len 4) Bluetooth: hci5: ACL packet for unknown connection handle 233 Bluetooth: hci5: ACL packet for unknown connection handle 233 Bluetooth: hci5: ACL packet for unknown connection handle 233 Bluetooth: Unexpected continuation frame (len 28) Bluetooth: Unexpected continuation frame (len 28) Bluetooth: Unexpected start frame (len 16) Bluetooth: Unexpected start frame (len 16) Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci1: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci2: ACL packet for unknown connection handle 2048 Bluetooth: hci0: command 0x0406 tx timeout --- This report is generated by a bot. 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