From: Vivek Goyal <vgoyal@redhat.com>
To: Qian Cai <cai@redhat.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
linux-kernel@vger.kernel.org, virtio-fs@redhat.com,
Alexander Viro <viro@zeniv.linux.org.uk>,
linux-fsdevel@vger.kernel.org
Subject: Re: [Virtio-fs] Unbreakable loop in fuse_fill_write_pages()
Date: Tue, 13 Oct 2020 15:57:19 -0400 [thread overview]
Message-ID: <20201013195719.GD142988@redhat.com> (raw)
In-Reply-To: <d14f6a08b4ada85289e70cbb34726fd084ccac05.camel@redhat.com>
On Tue, Oct 13, 2020 at 03:53:19PM -0400, Qian Cai wrote:
> On Tue, 2020-10-13 at 14:58 -0400, Vivek Goyal wrote:
>
> > I am wondering if virtiofsd still alive and responding to requests? I
> > see another task which is blocked on getdents() for more than 120s.
> >
> > [10580.142571][ T348] INFO: task trinity-c36:254165 blocked for more than 123
> > +seconds.
> > [10580.143924][ T348] Tainted: G O 5.9.0-next-20201013+ #2
> > [10580.145158][ T348] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > +disables this message.
> > [10580.146636][ T348] task:trinity-c36 state:D stack:26704 pid:254165
> > ppid:
> > +87180 flags:0x00000004
> > [10580.148260][ T348] Call Trace:
> > [10580.148789][ T348] __schedule+0x71d/0x1b50
> > [10580.149532][ T348] ? __sched_text_start+0x8/0x8
> > [10580.150343][ T348] schedule+0xbf/0x270
> > [10580.151044][ T348] schedule_preempt_disabled+0xc/0x20
> > [10580.152006][ T348] __mutex_lock+0x9f1/0x1360
> > [10580.152777][ T348] ? __fdget_pos+0x9c/0xb0
> > [10580.153484][ T348] ? mutex_lock_io_nested+0x1240/0x1240
> > [10580.154432][ T348] ? find_held_lock+0x33/0x1c0
> > [10580.155220][ T348] ? __fdget_pos+0x9c/0xb0
> > [10580.155934][ T348] __fdget_pos+0x9c/0xb0
> > [10580.156660][ T348] __x64_sys_getdents+0xff/0x230
> >
> > May be virtiofsd crashed and hence no requests are completing leading
> > to a hard lockup?
> Virtiofsd is still working. Once this happened, I manually create a file on the
> guest (in virtiofs) and then I can see the content of it from the host.
Hmm..., So how do I reproduce it. Just run trinity as root and it will
reproduce after some time?
Vivek
WARNING: multiple messages have this Message-ID (diff)
From: Vivek Goyal <vgoyal@redhat.com>
To: Qian Cai <cai@redhat.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Stefan Hajnoczi <stefanha@redhat.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
virtio-fs@redhat.com
Subject: Re: Unbreakable loop in fuse_fill_write_pages()
Date: Tue, 13 Oct 2020 15:57:19 -0400 [thread overview]
Message-ID: <20201013195719.GD142988@redhat.com> (raw)
In-Reply-To: <d14f6a08b4ada85289e70cbb34726fd084ccac05.camel@redhat.com>
On Tue, Oct 13, 2020 at 03:53:19PM -0400, Qian Cai wrote:
> On Tue, 2020-10-13 at 14:58 -0400, Vivek Goyal wrote:
>
> > I am wondering if virtiofsd still alive and responding to requests? I
> > see another task which is blocked on getdents() for more than 120s.
> >
> > [10580.142571][ T348] INFO: task trinity-c36:254165 blocked for more than 123
> > +seconds.
> > [10580.143924][ T348] Tainted: G O 5.9.0-next-20201013+ #2
> > [10580.145158][ T348] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> > +disables this message.
> > [10580.146636][ T348] task:trinity-c36 state:D stack:26704 pid:254165
> > ppid:
> > +87180 flags:0x00000004
> > [10580.148260][ T348] Call Trace:
> > [10580.148789][ T348] __schedule+0x71d/0x1b50
> > [10580.149532][ T348] ? __sched_text_start+0x8/0x8
> > [10580.150343][ T348] schedule+0xbf/0x270
> > [10580.151044][ T348] schedule_preempt_disabled+0xc/0x20
> > [10580.152006][ T348] __mutex_lock+0x9f1/0x1360
> > [10580.152777][ T348] ? __fdget_pos+0x9c/0xb0
> > [10580.153484][ T348] ? mutex_lock_io_nested+0x1240/0x1240
> > [10580.154432][ T348] ? find_held_lock+0x33/0x1c0
> > [10580.155220][ T348] ? __fdget_pos+0x9c/0xb0
> > [10580.155934][ T348] __fdget_pos+0x9c/0xb0
> > [10580.156660][ T348] __x64_sys_getdents+0xff/0x230
> >
> > May be virtiofsd crashed and hence no requests are completing leading
> > to a hard lockup?
> Virtiofsd is still working. Once this happened, I manually create a file on the
> guest (in virtiofs) and then I can see the content of it from the host.
Hmm..., So how do I reproduce it. Just run trinity as root and it will
reproduce after some time?
Vivek
next prev parent reply other threads:[~2020-10-13 19:57 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-13 17:11 [Virtio-fs] Unbreakable loop in fuse_fill_write_pages() Qian Cai
2020-10-13 17:11 ` Qian Cai
2020-10-13 18:40 ` [Virtio-fs] " Vivek Goyal
2020-10-13 18:40 ` Vivek Goyal
2020-10-13 18:58 ` [Virtio-fs] " Vivek Goyal
2020-10-13 18:58 ` Vivek Goyal
2020-10-13 19:12 ` [Virtio-fs] " Qian Cai
2020-10-13 19:12 ` Qian Cai
2020-10-13 19:20 ` [Virtio-fs] " Harry G. Coin
2020-10-13 19:53 ` Qian Cai
2020-10-13 19:53 ` Qian Cai
2020-10-13 19:57 ` Vivek Goyal [this message]
2020-10-13 19:57 ` Vivek Goyal
2020-10-13 20:10 ` [Virtio-fs] " Qian Cai
2020-10-13 20:10 ` Qian Cai
2020-10-14 8:26 ` [Virtio-fs] " Dr. David Alan Gilbert
2020-10-14 8:26 ` Dr. David Alan Gilbert
2020-10-15 13:18 ` Qian Cai
2020-10-15 13:18 ` Qian Cai
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