linux-kernel - Re: [PATCH] Revert "usb: core: remove local_irq

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Message-ID: <fb64b378-57a1-19f4-0fd2-1689fc3d8540@web.de>
Date:   Wed, 12 Jun 2019 12:38:29 +0200
From:   Soeren Moch <smoch@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] Revert "usb: core: remove local_irq_save() around
 ->complete() handler"



On 01.06.19 13:02, Sebastian Andrzej Siewior wrote:
> On 2019-06-01 12:50:08 [+0200], To Soeren Moch wrote:
>> I will look into this.
>
> nothing obvious. If there is really blocken lock, could you please
> enable lockdep
> |CONFIG_LOCK_DEBUGGING_SUPPORT=y
> |CONFIG_PROVE_LOCKING=y
> |# CONFIG_LOCK_STAT is not set
> |CONFIG_DEBUG_RT_MUTEXES=y
> |CONFIG_DEBUG_SPINLOCK=y
> |CONFIG_DEBUG_MUTEXES=y
> |CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y
> |CONFIG_DEBUG_RWSEMS=y
> |CONFIG_DEBUG_LOCK_ALLOC=y
> |CONFIG_LOCKDEP=y
> |# CONFIG_DEBUG_LOCKDEP is not set
> |CONFIG_DEBUG_ATOMIC_SLEEP=y
>
> and send me the splat that lockdep will report?
>

Nothing interesting:

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 5.1.0 (root@...rix) (gcc version 7.4.0
(Debian 7.4.0-6)) #6 SMP PREEMPT Wed Jun 12 11:28:41 CEST 2019
[    0.000000] CPU: ARMv7 Processor [412fc09a] revision 10 (ARMv7),
cr=10c5387d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
instruction cache
[    0.000000] OF: fdt: Machine model: TBS2910 Matrix ARM mini PC
...
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000] rcu:     RCU lockdep checking is enabled.
...
[    0.003546] Lock dependency validator: Copyright (c) 2006 Red Hat,
Inc., Ingo Molnar
[    0.003657] ... MAX_LOCKDEP_SUBCLASSES:  8
[    0.003713] ... MAX_LOCK_DEPTH:          48
[    0.003767] ... MAX_LOCKDEP_KEYS:        8191
[    0.003821] ... CLASSHASH_SIZE:          4096
[    0.003876] ... MAX_LOCKDEP_ENTRIES:     32768
[    0.003931] ... MAX_LOCKDEP_CHAINS:      65536
[    0.003986] ... CHAINHASH_SIZE:          32768
[    0.004042]  memory used by lock dependency info: 5243 kB

Nothing else.

When stopping hostapd after it hangs:
[  903.504475] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue
14 failed to flush

Soeren