All process has been hanged after a kernel WARNING in kernel 4.4.x

Dear experts I install kernel 4.4.70-rt83 in my environment, and run QEMU-KVM & OVS-DPDK on my server. After a kernel warning, I found that all of the process, such as sshd, has no response. The monitor cannot displayed. All process looks like has been hanged. But the server coul

RE: BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

Thanks Julia, I will try it Thanks Feng >-Original Message- >From: Julia Cartwright [mailto:ju...@ni.com] >Sent: Tuesday, June 27, 2017 10:28 PM >To: Feng Feng24 Liu >Cc: Sebastian Andrzej Siewior; Steven Rostedt; Mike Galbraith; >linux-kernel@vger.kerne

RE: BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

atch email) Thanks Feng >-Original Message- >From: Julia Cartwright [mailto:ju...@ni.com] >Sent: Monday, June 26, 2017 11:56 PM >To: Sebastian Andrzej Siewior >Cc: Steven Rostedt; Feng Feng24 Liu; Mike Galbraith; >linux-kernel@vger.kernel.org; >linux-rt-us...@vger.kerne

RE: BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

Hi, Sebastian I just add the RT patches, nothing else. Thanks Feng >-Original Message- >From: Sebastian Andrzej Siewior [mailto:sebastian.siew...@linutronix.de] >Sent: Monday, June 26, 2017 10:55 PM >To: Steven Rostedt >Cc: Feng Feng24 Liu; Mike Galbrait

RE: BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

nday, the kernel have already been hang-up. Thanks Feng >-Original Message- >From: Steven Rostedt [mailto:rost...@goodmis.org] >Sent: Monday, June 26, 2017 10:24 PM >To: Feng Feng24 Liu >Cc: Sebastian Andrzej Siewior; Mike Galbraith; linux-kernel@vger.kernel.org; >linux-

[__try_to_take_rt_mutex] BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

node-1 kernel: [45782.933528] [] ? _raw_spin_lock_irqsave+0x4b/0x50 <4>Jun 24 10:16:58 node-1 kernel: [45782.933529] [] ? rt_spin_lock_slowlock+0x5f/0x390 <4>Jun 24 10:16:58 node-1 kernel: [45782.933531] [] ? rt_spin_lock+0x1f/0x30 <4>Jun 24 10:16:58 node-1 kernel: [45782.933535] [] ? dput+0xce/0x270 <4>Jun 24 10:16

BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 !//RE: kernel BUG at kernel/locking/rtmutex.c:1027

-1 kernel: [45782.933528] [] ? _raw_spin_lock_irqsave+0x4b/0x50 <4>Jun 24 10:16:58 node-1 kernel: [45782.933529] [] ? rt_spin_lock_slowlock+0x5f/0x390 <4>Jun 24 10:16:58 node-1 kernel: [45782.933531] [] ? rt_spin_lock+0x1f/0x30 <4>Jun 24 10:16:58 node-1 kernel: [45782.933535] [] ? dput+0xce/0x270 <4>Jun 24 10:16:58 node-1 kernel: [45782.933536] [] ? __fput+0x16a/0x1e0 <4>Jun 24 10:16

RE: kernel BUG at kernel/locking/rtmutex.c:1027

t; not apply to the upsteam or rt-patches? Thanks a lot Thanks Feng >-----Original Message- >From: Feng Feng24 Liu >Sent: Tuesday, June 06, 2017 11:18 PM >To: 'linux-kernel@vger.kernel.org'; 'linux-rt-us...@vger.kernel.org'; >'rost...@goodmi

kernel BUG at kernel/locking/rtmutex.c:1027

Dear RT experts, I upgrate our kernel from kernel-3.10 to kernel4.4.6-rt14 in our environment. But the RT kernel alway report deadlock. I added the following debugging statement: diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 6c40660..e979aa9 100644 --- a/kernel/locking