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SubjectRe: [PATCH] Revert "usb: core: remove local_irq_save() around ->complete() handler"
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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@matrix) (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

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