4e8c36c3b0
Unregister from suspend notifications and cancel suspend preparations
before running hci_dev_do_close. Otherwise, the suspend notifier may
race with unregister and cause cmd_timeout even after hdev has been
freed.
Below is the trace from when this panic was seen:
[ 832.578518] Bluetooth: hci_core.c:hci_cmd_timeout() hci0: command 0x0c05 tx timeout
[ 832.586200] BUG: kernel NULL pointer dereference, address: 0000000000000000
[ 832.586203] #PF: supervisor read access in kernel mode
[ 832.586205] #PF: error_code(0x0000) - not-present page
[ 832.586206] PGD 0 P4D 0
[ 832.586210] PM: suspend exit
[ 832.608870] Oops: 0000 [#1] PREEMPT SMP NOPTI
[ 832.613232] CPU: 3 PID: 10755 Comm: kworker/3:7 Not tainted 5.4.44-04894-g1e9dbb96a161 #1
[ 832.630036] Workqueue: events hci_cmd_timeout [bluetooth]
[ 832.630046] RIP: 0010:__queue_work+0xf0/0x374
[ 832.630051] RSP: 0018:ffff9b5285f1fdf8 EFLAGS: 00010046
[ 832.674033] RAX: ffff8a97681bac00 RBX: 0000000000000000 RCX: ffff8a976a000600
[ 832.681162] RDX: 0000000000000000 RSI: 0000000000000009 RDI: ffff8a976a000748
[ 832.688289] RBP: ffff9b5285f1fe38 R08: 0000000000000000 R09: ffff8a97681bac00
[ 832.695418] R10: 0000000000000002 R11: ffff8a976a0006d8 R12: ffff8a9745107600
[ 832.698045] usb 1-6: new full-speed USB device number 119 using xhci_hcd
[ 832.702547] R13: ffff8a9673658850 R14: 0000000000000040 R15: 000000000000001e
[ 832.702549] FS: 0000000000000000(0000) GS:ffff8a976af80000(0000) knlGS:0000000000000000
[ 832.702550] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 832.702550] CR2: 0000000000000000 CR3: 000000010415a000 CR4: 00000000003406e0
[ 832.702551] Call Trace:
[ 832.702558] queue_work_on+0x3f/0x68
[ 832.702562] process_one_work+0x1db/0x396
[ 832.747397] worker_thread+0x216/0x375
[ 832.751147] kthread+0x138/0x140
[ 832.754377] ? pr_cont_work+0x58/0x58
[ 832.758037] ? kthread_blkcg+0x2e/0x2e
[ 832.761787] ret_from_fork+0x22/0x40
[ 832.846191] ---[ end trace fa93f466da517212 ]---
Fixes:
|
||
|---|---|---|
| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
README
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.