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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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5ff20cbe67
kmemleak report:
unreferenced object 0xffff9b1127f00500 (size 208):
comm "kworker/u17:2", pid 500, jiffies 4294937470 (age 580.136s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 60 ed 05 11 9b ff ff 00 00 00 00 00 00 00 00 .`..............
backtrace:
[<000000006ab3fd59>] kmem_cache_alloc_node+0x17a/0x480
[<0000000051a5f6f9>] __alloc_skb+0x5b/0x1d0
[<0000000037e2d252>] hci_prepare_cmd+0x32/0xc0 [bluetooth]
[<0000000010b586d5>] hci_req_add_ev+0x84/0xe0 [bluetooth]
[<00000000d2deb520>] hci_req_clear_event_filter+0x42/0x70 [bluetooth]
[<00000000f864bd8c>] hci_req_prepare_suspend+0x84/0x470 [bluetooth]
[<000000001deb2cc4>] hci_prepare_suspend+0x31/0x40 [bluetooth]
[<000000002677dd79>] process_one_work+0x209/0x3b0
[<00000000aaa62b07>] worker_thread+0x34/0x400
[<00000000826d176c>] kthread+0x126/0x140
[<000000002305e558>] ret_from_fork+0x22/0x30
unreferenced object 0xffff9b1125c6ee00 (size 512):
comm "kworker/u17:2", pid 500, jiffies 4294937470 (age 580.136s)
hex dump (first 32 bytes):
04 00 00 00 0d 00 00 00 05 0c 01 00 11 9b ff ff ................
00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 ................
backtrace:
[<000000009f07c0cc>] slab_post_alloc_hook+0x59/0x270
[<0000000049431dc2>] __kmalloc_node_track_caller+0x15f/0x330
[<00000000027a42f6>] __kmalloc_reserve.isra.70+0x31/0x90
[<00000000e8e3e76a>] __alloc_skb+0x87/0x1d0
[<0000000037e2d252>] hci_prepare_cmd+0x32/0xc0 [bluetooth]
[<0000000010b586d5>] hci_req_add_ev+0x84/0xe0 [bluetooth]
[<00000000d2deb520>] hci_req_clear_event_filter+0x42/0x70 [bluetooth]
[<00000000f864bd8c>] hci_req_prepare_suspend+0x84/0x470 [bluetooth]
[<000000001deb2cc4>] hci_prepare_suspend+0x31/0x40 [bluetooth]
[<000000002677dd79>] process_one_work+0x209/0x3b0
[<00000000aaa62b07>] worker_thread+0x34/0x400
[<00000000826d176c>] kthread+0x126/0x140
[<000000002305e558>] ret_from_fork+0x22/0x30
unreferenced object 0xffff9b112b395788 (size 8):
comm "kworker/u17:2", pid 500, jiffies 4294937470 (age 580.136s)
hex dump (first 8 bytes):
20 00 00 00 00 00 04 00 .......
backtrace:
[<0000000052dc28d2>] kmem_cache_alloc_trace+0x15e/0x460
[<0000000046147591>] alloc_ctrl_urb+0x52/0xe0 [btusb]
[<00000000a2ed3e9e>] btusb_send_frame+0x91/0x100 [btusb]
[<000000001e66030e>] hci_send_frame+0x7e/0xf0 [bluetooth]
[<00000000bf6b7269>] hci_cmd_work+0xc5/0x130 [bluetooth]
[<000000002677dd79>] process_one_work+0x209/0x3b0
[<00000000aaa62b07>] worker_thread+0x34/0x400
[<00000000826d176c>] kthread+0x126/0x140
[<000000002305e558>] ret_from_fork+0x22/0x30
In pm sleep-resume context, while the btusb device rebinds, it enters
hci_unregister_dev(), whilst there is a possibility of hdev receiving
PM_POST_SUSPEND suspend_notifier event, leading to generation of msg
frames. When hci_unregister_dev() completes, i.e. hdev context is
destroyed/freed, those intermittently sent msg frames cause memory
leak.
BUG details:
Below is stack trace of thread that enters hci_unregister_dev(), marks
the hdev flag HCI_UNREGISTER to 1, and then goes onto to wait on notifier
lock - refer unregister_pm_notifier().
hci_unregister_dev+0xa5/0x320 [bluetoot]
btusb_disconnect+0x68/0x150 [btusb]
usb_unbind_interface+0x77/0x250
? kernfs_remove_by_name_ns+0x75/0xa0
device_release_driver_internal+0xfe/0x1
device_release_driver+0x12/0x20
bus_remove_device+0xe1/0x150
device_del+0x192/0x3e0
? usb_remove_ep_devs+0x1f/0x30
usb_disable_device+0x92/0x1b0
usb_disconnect+0xc2/0x270
hub_event+0x9f6/0x15d0
? rpm_idle+0x23/0x360
? rpm_idle+0x26b/0x360
process_one_work+0x209/0x3b0
worker_thread+0x34/0x400
? process_one_work+0x3b0/0x3b0
kthread+0x126/0x140
? kthread_park+0x90/0x90
ret_from_fork+0x22/0x30
Below is stack trace of thread executing hci_suspend_notifier() which
processes the PM_POST_SUSPEND event, while the unbinding thread is
waiting on lock.
hci_suspend_notifier.cold.39+0x5/0x2b [bluetooth]
blocking_notifier_call_chain+0x69/0x90
pm_notifier_call_chain+0x1a/0x20
pm_suspend.cold.9+0x334/0x352
state_store+0x84/0xf0
kobj_attr_store+0x12/0x20
sysfs_kf_write+0x3b/0x40
kernfs_fop_write+0xda/0x1c0
vfs_write+0xbb/0x250
ksys_write+0x61/0xe0
__x64_sys_write+0x1a/0x20
do_syscall_64+0x37/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Fix hci_suspend_notifer(), not to act on events when flag HCI_UNREGISTER
is set.
Signed-off-by: Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.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.