Re: sound: deadlock between snd_rawmidi_kernel_open/snd_seq_port_connect

2016-02-03 Thread Takashi Iwai
On Wed, 03 Feb 2016 14:22:18 +0100, Dmitry Vyukov wrote: > > On Wed, Feb 3, 2016 at 8:47 AM, Takashi Iwai wrote: > >> > This looks like a false-positive report to me. Of course, we should > >> > annotate the mutex there for nested locks, though. > >> > >> > >> Takashi, can you please annotate it

Re: sound: deadlock between snd_rawmidi_kernel_open/snd_seq_port_connect

2016-02-03 Thread Dmitry Vyukov
On Wed, Feb 3, 2016 at 8:47 AM, Takashi Iwai wrote: >> > This looks like a false-positive report to me. Of course, we should >> > annotate the mutex there for nested locks, though. >> >> >> Takashi, can you please annotate it for lockdep? I hit it on every run. > > The lock had an annotation but

Re: sound: deadlock between snd_rawmidi_kernel_open/snd_seq_port_connect

2016-02-02 Thread Takashi Iwai
On Tue, 02 Feb 2016 22:23:55 +0100, Dmitry Vyukov wrote: > > On Mon, Jan 25, 2016 at 11:47 AM, Takashi Iwai wrote: > > On Sun, 24 Jan 2016 10:44:34 +0100, > > Dmitry Vyukov wrote: > >> > >> Hello, > >> > >> While running syzkaller fuzzer I've got the following lockdep report: > >> > >> ==

Re: sound: deadlock between snd_rawmidi_kernel_open/snd_seq_port_connect

2016-02-02 Thread Dmitry Vyukov
On Mon, Jan 25, 2016 at 11:47 AM, Takashi Iwai wrote: > On Sun, 24 Jan 2016 10:44:34 +0100, > Dmitry Vyukov wrote: >> >> Hello, >> >> While running syzkaller fuzzer I've got the following lockdep report: >> >> == >> [ INFO: possible circular lock

Re: sound: deadlock between snd_rawmidi_kernel_open/snd_seq_port_connect

2016-01-25 Thread Takashi Iwai
On Sun, 24 Jan 2016 10:44:34 +0100, Dmitry Vyukov wrote: > > Hello, > > While running syzkaller fuzzer I've got the following lockdep report: > > == > [ INFO: possible circular locking dependency detected ] > 4.4.0+ #276 Not tainted > -

sound: deadlock between snd_rawmidi_kernel_open/snd_seq_port_connect

2016-01-24 Thread Dmitry Vyukov
Hello, While running syzkaller fuzzer I've got the following lockdep report: == [ INFO: possible circular locking dependency detected ] 4.4.0+ #276 Not tainted --- syz-executor/21025 is trying