[syzbot] WARNING: locking bug in hfa384x_usbctlx_completion_task

[syzbot] WARNING: locking bug in hfa384x_usbctlx_completion_task

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    105f3fd2f789 Merge branch 'staging-octeon' of gitolite.ker..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
console output: https://syzkaller.appspot.com/x/log.txt?x=129a824bf00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a352a56bc8822d0c
dashboard link: https://syzkaller.appspot.com/bug?extid=ce3408364c4a234dd90c
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10a97af8080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1031ec4bf00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ce3408364c4a234dd90c@syzkaller.appspotmail.com

------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:231 [inline]
WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:220 [inline]
WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline]
WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 __lock_acquire+0x1356/0x5660 kernel/locking/lockdep.c:5003
Modules linked in:
CPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 5.19.0-rc3-syzkaller-00071-g105f3fd2f789 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events hfa384x_usbctlx_completion_task
RIP: 0010:hlock_class kernel/locking/lockdep.c:231 [inline]
RIP: 0010:hlock_class kernel/locking/lockdep.c:220 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4727 [inline]
RIP: 0010:__lock_acquire+0x1356/0x5660 kernel/locking/lockdep.c:5003
Code: 08 84 d2 0f 85 0e 30 00 00 8b 35 7d ec b3 07 85 f6 0f 85 f4 fd ff ff 48 c7 c6 e0 97 47 86 48 c7 c7 20 92 47 86 e8 9a 5b 96 04 <0f> 0b 31 ed e9 aa f0 ff ff e8 fc f1 e8 00 85 c0 0f 84 12 fe ff ff
RSP: 0018:ffffc9000016fa28 EFLAGS: 00010082
RAX: 0000000000000000 RBX: ffff888109450be0 RCX: 0000000000000000
RDX: ffff888100371c80 RSI: ffffffff812c1d98 RDI: fffff5200002df37
RBP: 0000000000000edc R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000001 R11: 0000000000000001 R12: ffff8881003726c8
R13: ffff888100371c80 R14: 0000000000040000 R15: 00000000000c0edc
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fb59fac7c0 CR3: 0000000109e53000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5665 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
 hfa384x_usbctlx_completion_task+0x35/0x510 drivers/staging/wlan-ng/hfa384x_usb.c:2641
 process_one_work+0x996/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2ef/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>


---
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syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

Re: [syzbot] WARNING: locking bug in hfa384x_usbctlx_completion_task

[Davidlohr Bueso]

It's nice to see this sort of stuff actually tested :)

On Sun, 26 Jun 2022, syzbot wrote:

>------------[ cut here ]------------
>DEBUG_LOCKS_WARN_ON(1)
>WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:231 [inline]
>WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:220 [inline]
>WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline]
>WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 __lock_acquire+0x1356/0x5660 kernel/locking/lockdep.c:5003
>Modules linked in:
>CPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 5.19.0-rc3-syzkaller-00071-g105f3fd2f789 #0
>Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
>Workqueue: events hfa384x_usbctlx_completion_task

Sorry about that, the below should fix it. Thanks.

---8<-------------------------------
From: Davidlohr Bueso <dave@stgolabs.net>
Subject: [PATCH] staging/wlan-ng: get the correct struct hfa384x in work callback

hfa384x_usbctlx_completion_task() is bogusly using the reaper BH when
in fact this is the completion_bh. This was reflected when trying
to acquire the hw->ctlxq.lock and getting a failed lockdep class
initialized to it.

Reported-by: syzbot+ce3408364c4a234dd90c@syzkaller.appspotmail.com
Fixes: 9442e81d7e7 (staging/wlan-ng, prism2usb: replace completion_bh tasklet with work)
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
---
  drivers/staging/wlan-ng/hfa384x_usb.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/wlan-ng/hfa384x_usb.c b/drivers/staging/wlan-ng/hfa384x_usb.c
index 33844526c797..02fdef7a16c8 100644
--- a/drivers/staging/wlan-ng/hfa384x_usb.c
+++ b/drivers/staging/wlan-ng/hfa384x_usb.c
@@ -2632,7 +2632,7 @@ static void hfa384x_usbctlx_reaper_task(struct work_struct *work)
   */
  static void hfa384x_usbctlx_completion_task(struct work_struct *work)
  {
-	struct hfa384x *hw = container_of(work, struct hfa384x, reaper_bh);
+	struct hfa384x *hw = container_of(work, struct hfa384x, completion_bh);
	struct hfa384x_usbctlx *ctlx, *temp;
	unsigned long flags;

--
2.36.1

Re: [syzbot] WARNING: locking bug in hfa384x_usbctlx_completion_task

[Greg KH]

On Mon, Jun 27, 2022 at 10:08:38AM -0700, Davidlohr Bueso wrote:
> It's nice to see this sort of stuff actually tested :)
> 
> On Sun, 26 Jun 2022, syzbot wrote:
> 
> > ------------[ cut here ]------------
> > DEBUG_LOCKS_WARN_ON(1)
> > WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:231 [inline]
> > WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 hlock_class kernel/locking/lockdep.c:220 [inline]
> > WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline]
> > WARNING: CPU: 1 PID: 21 at kernel/locking/lockdep.c:231 __lock_acquire+0x1356/0x5660 kernel/locking/lockdep.c:5003
> > Modules linked in:
> > CPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 5.19.0-rc3-syzkaller-00071-g105f3fd2f789 #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> > Workqueue: events hfa384x_usbctlx_completion_task
> 
> Sorry about that, the below should fix it. Thanks.
> 
> ---8<-------------------------------
> From: Davidlohr Bueso <dave@stgolabs.net>
> Subject: [PATCH] staging/wlan-ng: get the correct struct hfa384x in work callback
> 
> hfa384x_usbctlx_completion_task() is bogusly using the reaper BH when
> in fact this is the completion_bh. This was reflected when trying
> to acquire the hw->ctlxq.lock and getting a failed lockdep class
> initialized to it.
> 
> Reported-by: syzbot+ce3408364c4a234dd90c@syzkaller.appspotmail.com
> Fixes: 9442e81d7e7 (staging/wlan-ng, prism2usb: replace completion_bh tasklet with work)
> Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
> ---
>  drivers/staging/wlan-ng/hfa384x_usb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Can you submit this properly so that I can accept it?

thanks,

greg k-h

[PATCH] staging/wlan-ng: get the correct struct hfa384x in work callback

[Davidlohr Bueso]

hfa384x_usbctlx_completion_task() is bogusly using the reaper BH when
in fact this is the completion_bh. This was reflected when trying
to acquire the hw->ctlxq.lock and getting a failed lockdep class
initialized to it.

Reported-by: syzbot+ce3408364c4a234dd90c@syzkaller.appspotmail.com
Fixes: 9442e81d7e7 (staging/wlan-ng, prism2usb: replace completion_bh tasklet with work)
Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
---
 drivers/staging/wlan-ng/hfa384x_usb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/wlan-ng/hfa384x_usb.c b/drivers/staging/wlan-ng/hfa384x_usb.c
index 33844526c797..02fdef7a16c8 100644
--- a/drivers/staging/wlan-ng/hfa384x_usb.c
+++ b/drivers/staging/wlan-ng/hfa384x_usb.c
@@ -2632,7 +2632,7 @@ static void hfa384x_usbctlx_reaper_task(struct work_struct *work)
  */
 static void hfa384x_usbctlx_completion_task(struct work_struct *work)
 {
-	struct hfa384x *hw = container_of(work, struct hfa384x, reaper_bh);
+	struct hfa384x *hw = container_of(work, struct hfa384x, completion_bh);
 	struct hfa384x_usbctlx *ctlx, *temp;
 	unsigned long flags;
 
-- 
2.36.1