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[ Upstream commit6a5ad251b7] This attempts to fix the following trace: kworker/u3:1/184 is trying to acquire lock: ffff888001888130 (sk_lock-AF_BLUETOOTH-BTPROTO_ISO){+.+.}-{0:0}, at: iso_connect_cfm+0x2de/0x690 but task is already holding lock: ffff8880028d1c20 (&conn->lock){+.+.}-{2:2}, at: iso_connect_cfm+0x265/0x690 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&conn->lock){+.+.}-{2:2}: lock_acquire+0x176/0x3d0 _raw_spin_lock+0x2a/0x40 __iso_sock_close+0x1dd/0x4f0 iso_sock_release+0xa0/0x1b0 sock_close+0x5e/0x120 __fput+0x102/0x410 task_work_run+0xf1/0x160 exit_to_user_mode_prepare+0x170/0x180 syscall_exit_to_user_mode+0x19/0x50 do_syscall_64+0x4e/0x90 entry_SYSCALL_64_after_hwframe+0x62/0xcc -> #0 (sk_lock-AF_BLUETOOTH-BTPROTO_ISO){+.+.}-{0:0}: check_prev_add+0xfc/0x1190 __lock_acquire+0x1e27/0x2750 lock_acquire+0x176/0x3d0 lock_sock_nested+0x32/0x80 iso_connect_cfm+0x2de/0x690 hci_cc_le_setup_iso_path+0x195/0x340 hci_cmd_complete_evt+0x1ae/0x500 hci_event_packet+0x38e/0x7c0 hci_rx_work+0x34c/0x980 process_one_work+0x5a5/0x9a0 worker_thread+0x89/0x6f0 kthread+0x14e/0x180 ret_from_fork+0x22/0x30 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&conn->lock); lock(sk_lock-AF_BLUETOOTH-BTPROTO_ISO); lock(&conn->lock); lock(sk_lock-AF_BLUETOOTH-BTPROTO_ISO); *** DEADLOCK *** Fixes:ccf74f2390("Bluetooth: Add BTPROTO_ISO socket type") Fixes:f764a6c2c1("Bluetooth: ISO: Add broadcast support") Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.