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From:   Rondreis <linhaoguo86@gmail.com>
Date:   Thu, 11 Aug 2022 10:06:37 +0800
Message-ID: <CAB7eexKUpvX-JNiLzhXBDWgfg2T9e9_0Tw4HQ6keN==voRbP0g@mail.gmail.com>
Subject: possible recursive locking detected in kernel v5.18
To:     stern@rowland.harvard.edu, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

Hello,

When fuzzing the Linux kernel driver v5.18.0, the following crash was triggered.

HEAD commit: 4b0986a3613c92f4ec1bdc7f60ec66fea135991f (HEAD, tag: v5.18)
git tree: upstream

kernel config: https://pastebin.com/KecL2gaG
C reproducer: https://pastebin.com/ZX3ZtZZ4
console output: https://pastebin.com/UYyiRL3E

Basically, in the c reproducer, we use the gadget module to emulate
the process of attaching a usb device (vendor id: 0x13d3, product id:
0x3340, with function: ms_null and midi_null).
To reproduce this crash, we utilize a third-party library to emulate
the attaching process: https://github.com/linux-usb-gadgets/libusbgx.
Just clone this repository, make install it, and compile the c
reproducer with ``` gcc crash.c -lusbgx -o crash ``` will do the
trick.

It seems that there is a deadlock happened in function usb_stor_post_reset

The crash report is as follow:

```
usb 7-1: r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
============================================
WARNING: possible recursive locking detected
5.18.0 #3 Not tainted
--------------------------------------------
kworker/1:3/1205 is trying to acquire lock:
ffff888018638db8 (&us_interface_key[i]){+.+.}-{3:3}, at:
usb_stor_pre_reset+0x35/0x40 drivers/usb/storage/usb.c:230

but task is already holding lock:
ffff888018638db8 (&us_interface_key[i]){+.+.}-{3:3}, at:
usb_stor_pre_reset+0x35/0x40 drivers/usb/storage/usb.c:230

other info that might help us debug this:
Possible unsafe locking scenario:

CPU0
----
lock(&us_interface_key[i]);
lock(&us_interface_key[i]);

*** DEADLOCK ***

May be due to missing lock nesting notation

7 locks held by kworker/1:3/1205:
#0: ffff888105a82d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: ffff888105a82d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at:
arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
#0: ffff888105a82d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at:
atomic_long_set include/linux/atomic/atomic-instrumented.h:1280
[inline]
#0: ffff888105a82d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at:
set_work_data kernel/workqueue.c:636 [inline]
#0: ffff888105a82d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:663 [inline]
#0: ffff888105a82d38 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at:
process_one_work+0x8b0/0x1650 kernel/workqueue.c:2260
#1: ffffc900004f7db0 ((work_completion)(&hub->events)){+.+.}-{0:0},
at: process_one_work+0x8e4/0x1650 kernel/workqueue.c:2264
#2: ffff88810be5a220 (&dev->mutex){....}-{3:3}, at: device_lock
include/linux/device.h:835 [inline]
#2: ffff88810be5a220 (&dev->mutex){....}-{3:3}, at:
hub_event+0x1c1/0x4170 drivers/usb/core/hub.c:5691
#3: ffff888110850220 (&dev->mutex){....}-{3:3}, at:
__device_attach+0x7b/0x3f0 drivers/base/dd.c:965
#4: ffff888018a871a8 (&dev->mutex){....}-{3:3}, at:
__device_attach+0x7b/0x3f0 drivers/base/dd.c:965
#5: ffff888018638db8 (&us_interface_key[i]){+.+.}-{3:3}, at:
usb_stor_pre_reset+0x35/0x40 drivers/usb/storage/usb.c:230
#6: ffff8881085711a8 (&dev->mutex){....}-{3:3}, at:
device_release_driver_internal+0x23/0x2f0 drivers/base/dd.c:1245

stack backtrace:
CPU: 1 PID: 1205 Comm: kworker/1:3 Not tainted 5.18.0 #3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_deadlock_bug kernel/locking/lockdep.c:2988 [inline]
check_deadlock kernel/locking/lockdep.c:3031 [inline]
validate_chain kernel/locking/lockdep.c:3816 [inline]
__lock_acquire.cold+0x152/0x3ca kernel/locking/lockdep.c:5053
lock_acquire kernel/locking/lockdep.c:5665 [inline]
lock_acquire+0x1ab/0x520 kernel/locking/lockdep.c:5630
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x14f/0x1610 kernel/locking/mutex.c:747
usb_stor_pre_reset+0x35/0x40 drivers/usb/storage/usb.c:230
usb_reset_device+0x37d/0x9a0 drivers/usb/core/hub.c:6109
r871xu_dev_remove+0x21a/0x270 drivers/staging/rtl8712/usb_intf.c:622
usb_unbind_interface+0x1bd/0x890 drivers/usb/core/driver.c:458
device_remove drivers/base/dd.c:545 [inline]
device_remove+0x11f/0x170 drivers/base/dd.c:537
__device_release_driver drivers/base/dd.c:1222 [inline]
device_release_driver_internal+0x1a7/0x2f0 drivers/base/dd.c:1248
usb_driver_release_interface+0x102/0x180 drivers/usb/core/driver.c:627
usb_forced_unbind_intf+0x4d/0xa0 drivers/usb/core/driver.c:1118
usb_reset_device+0x39b/0x9a0 drivers/usb/core/hub.c:6114
rt2x00usb_probe+0x53/0x7f0
usb_probe_interface+0x310/0x800 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:555 [inline]
really_probe drivers/base/dd.c:634 [inline]
really_probe+0x23e/0xa00 drivers/base/dd.c:579
__driver_probe_device+0x338/0x4d0 drivers/base/dd.c:764
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:794
__device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:917
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
__device_attach+0x26d/0x3f0 drivers/base/dd.c:989
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
device_add+0xc45/0x1d40 drivers/base/core.c:3412
usb_set_configuration+0x1019/0x1900 drivers/usb/core/message.c:2170
usb_generic_driver_probe+0x9d/0xe0 drivers/usb/core/generic.c:238
usb_probe_device+0xd9/0x2a0 drivers/usb/core/driver.c:293
call_driver_probe drivers/base/dd.c:555 [inline]
really_probe drivers/base/dd.c:634 [inline]
really_probe+0x23e/0xa00 drivers/base/dd.c:579
__driver_probe_device+0x338/0x4d0 drivers/base/dd.c:764
driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:794
__device_attach_driver+0x20b/0x2f0 drivers/base/dd.c:917
bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427
__device_attach+0x26d/0x3f0 drivers/base/dd.c:989
bus_probe_device+0x1e4/0x290 drivers/base/bus.c:487
device_add+0xc45/0x1d40 drivers/base/core.c:3412
usb_new_device.cold+0x4b8/0x10ca drivers/usb/core/hub.c:2566
hub_port_connect drivers/usb/core/hub.c:5359 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5507 [inline]
port_event drivers/usb/core/hub.c:5663 [inline]
hub_event+0x231e/0x4170 drivers/usb/core/hub.c:5745
process_one_work+0x9cc/0x1650 kernel/workqueue.c:2289
worker_thread+0x623/0x1070 kernel/workqueue.c:2436
kthread+0x2ef/0x3a0 kernel/kthread.c:346
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
</TASK>


```