Re: v4.3-rc2, fault in sock_release via nfs_put_client

2015-09-27 Thread J. R. Okajima 

Trond Myklebust:
> On Sun, Sep 27, 2015 at 8:47 AM, J. R. Okajima  wrote:
> > I don't know whether this is a known issue or not (since I was off from
> > development for a few months), but I've got a "general protection fault:
> > " message from linux-4.3-rc2.
:::
> There is a fix for this issue in v4.3-rc3. Please see
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79234c3db6842a3de03817211d891e0c2878f756

Thank you.
Confirmed the problem is gone.


J. R. Okajima
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Re: v4.3-rc2, fault in sock_release via nfs_put_client

2015-09-27 Thread Trond Myklebust 
On Sun, Sep 27, 2015 at 8:47 AM, J. R. Okajima  wrote:
>
>
> Hello NFS folks,
>
> I don't know whether this is a known issue or not (since I was off from
> development for a few months), but I've got a "general protection fault:
> " message from linux-4.3-rc2.
> Here are the reproducible script and the log.
> Would you check them please?
>
> Notes:
> - The script cannot reproduce the problem perfectly. Not always. But if
>   you try several times, you will able to see. On my test system, I had
>   to try a few times.
> - As far as I know, if bind-mount did not happen, then the problem did
>   not happen either. But I am not sure whether bind-mount is really the
>   trigger of this issue.
>
>
> J. R. Okajima
>
> --
> #!/bin/sh
>
> set -eu
>
> Stat() # path
> {
> stat -f --printf="%n %T\n" $1
> }
>
> uname -a
> s=/dev/shm
> Stat $s
> c=/tmp/c
> mkdir -p $c
> showmount -e > /tmp/e
> sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
> localhost:$s
> showmount -e | diff /tmp/e - || :
> sudo mount -t nfs localhost:$s $c
> Stat $c
> b=/tmp/b
> mkdir -p $b
> sudo mount -o bind $c $b
> Stat $b
> > $b/f
> cat /proc/mounts > /tmp/m
> sudo umount -l $b
> diff /tmp/m /proc/mounts || :
> sync
> sleep 1
> cat /proc/mounts > /tmp/m
> sudo umount -l $c
> diff /tmp/m /proc/mounts
> sudo exportfs -u localhost:$s
> showmount -e | diff /tmp/e -
> --
>
> $ sh -x ./nfs-4.3-rc2.sh
> + set -eu
> + s=/dev/shm
> + Stat /dev/shm
> + stat -f --printf=%n %T\n /dev/shm
> /dev/shm tmpfs
> + c=/tmp/c
> + mkdir -p /tmp/c
> + showmount -e
> + sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
> localhost:/dev/shm
> + showmount -e
> + diff /tmp/e -
> 3a4
> > /dev/shm localhost
> + :
> + sudo mount -t nfs localhost:/dev/shm /tmp/c
> + Stat /tmp/c
> + stat -f --printf=%n %T\n /tmp/c
> /tmp/c nfs
> + b=/tmp/b
> + mkdir -p /tmp/b
> + sudo mount -o bind /tmp/c /tmp/b
> + Stat /tmp/b
> + stat -f --printf=%n %T\n /tmp/b
> /tmp/b nfs
> +
> + cat /proc/mounts
> + sudo umount -l /tmp/b
> + diff /tmp/m /proc/mounts
> 26d25
> < localhost:/dev/shm /tmp/b nfs4 
> rw,relatime,vers=4.0,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,clientaddr=127.0.0.1,local_lock=none,addr=127.0.0.1
>  0 0
> + :
> + sync
> + sleep 1
> + cat /proc/mounts
> + sudo umount -l /tmp/c
> general protection fault:  [#7] PREEMPT SMP
> Modules linked in: oprofile configs autofs4 nfsd [last unloaded: brd]
> CPU: 0 PID: 4325 Comm: umount.nfs Tainted: G  D 4.3.0-rc2aufsD+ 
> #67
> Hardware name: Pegatron Pegatron/IPM41, BIOS 0001 02/05/2009
> task: 88002d69ea00 ti: 88002ca0 task.ti: 88002ca0
> RIP: 0010:[]  [] sock_release+0x21/0x90
> RSP: 0018:88002ca03bd8  EFLAGS: 00010202
> RAX: 6b6b6b6b6b6b6b6b RBX: 88002812f7c0 RCX: 
> RDX:  RSI:  RDI: 88002812f7c0
> RBP: 88002ca03be8 R08:  R09: 
> R10:  R11: 0001 R12: 
> R13: 88002812f7c0 R14: 88002b8eeea0 R15: 0001
> FS:  7f763d4f57e0() GS:88002fc0() knlGS:
> CS:  0010 DS:  ES:  CR0: 8005003b
> CR2: 01176db8 CR3: 2d76c000 CR4: 000406f0
> Stack:
>  88002b87  88002ca03c18 81715afc
>  88002b87  88002b87 88002ca03d08
>  88002ca03c38 81715bd6  88002b87
> Call Trace:
>  [] xs_reset_transport+0x18c/0x250
>  [] xs_close+0x16/0x30
>  [] xs_destroy+0x16/0x30
>  [] xprt_destroy+0x6f/0x80
>  [] xprt_put+0x14/0x20
>  [] rpc_free_client+0x84/0xc0
>  [] rpc_release_client+0x5a/0x90
>  [] rpc_shutdown_client+0xf1/0x100
>  [] nfs_free_client+0x97/0xa0
>  [] nfs4_free_client+0xa4/0xc0
>  [] nfs_put_client+0x295/0x430
>  [] ? nfs4_alloc_client+0x380/0x380
>  [] nfs_free_server+0x7c/0xd0
>  [] nfs_kill_super+0x2c/0x40
>  [] deactivate_locked_super+0x51/0x90
>  [] deactivate_super+0x84/0x90
>  [] cleanup_mnt+0x97/0xe0
>  [] __cleanup_mnt+0x12/0x20
>  [] task_work_run+0x72/0xa0
>  [] prepare_exit_to_usermode+0x10b/0x150
>  [] ? mntput_no_expire+0x5/0x2c0
>  [] syscall_return_slowpath+0x96/0x2f0
>  [] int_ret_from_sys_call+0x25/0x9f
> Code: 5b 5d c3 0f 1f 80 00 00 00 00 66 66 66 66 90 55 48 89 e5 48 83 ec 10 48 
> 89 5d f0 48 89 fb 4c 89 65 f8 48 8b 47 28 48 85 c0 74 17 <4c> 8b 60 08 ff 50 
> 10 48 c7 43 28 00 00 00 00 4c 89 e7 e8 b8 7d
> RIP  [] sock_release+0x21/0x90
>  RSP 
> ---[ end trace 1bcdd4036690d082 ]---
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted


There is a fix for this

v4.3-rc2, fault in sock_release via nfs_put_client

2015-09-27 Thread J. R. Okajima 

Hello NFS folks,

I don't know whether this is a known issue or not (since I was off from
development for a few months), but I've got a "general protection fault:
" message from linux-4.3-rc2.
Here are the reproducible script and the log.
Would you check them please?

Notes:
- The script cannot reproduce the problem perfectly. Not always. But if
  you try several times, you will able to see. On my test system, I had
  to try a few times.
- As far as I know, if bind-mount did not happen, then the problem did
  not happen either. But I am not sure whether bind-mount is really the
  trigger of this issue.


J. R. Okajima

--
#!/bin/sh

set -eu

Stat() # path
{
stat -f --printf="%n %T\n" $1
}

uname -a
s=/dev/shm
Stat $s
c=/tmp/c
mkdir -p $c
showmount -e > /tmp/e
sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
localhost:$s
showmount -e | diff /tmp/e - || :
sudo mount -t nfs localhost:$s $c
Stat $c
b=/tmp/b
mkdir -p $b
sudo mount -o bind $c $b
Stat $b
> $b/f
cat /proc/mounts > /tmp/m
sudo umount -l $b
diff /tmp/m /proc/mounts || :
sync
sleep 1
cat /proc/mounts > /tmp/m
sudo umount -l $c
diff /tmp/m /proc/mounts
sudo exportfs -u localhost:$s
showmount -e | diff /tmp/e -
--

$ sh -x ./nfs-4.3-rc2.sh
+ set -eu
+ s=/dev/shm
+ Stat /dev/shm
+ stat -f --printf=%n %T\n /dev/shm
/dev/shm tmpfs
+ c=/tmp/c
+ mkdir -p /tmp/c
+ showmount -e
+ sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
localhost:/dev/shm
+ showmount -e
+ diff /tmp/e -
3a4
> /dev/shm localhost
+ :
+ sudo mount -t nfs localhost:/dev/shm /tmp/c
+ Stat /tmp/c
+ stat -f --printf=%n %T\n /tmp/c
/tmp/c nfs
+ b=/tmp/b
+ mkdir -p /tmp/b
+ sudo mount -o bind /tmp/c /tmp/b
+ Stat /tmp/b
+ stat -f --printf=%n %T\n /tmp/b
/tmp/b nfs
+
+ cat /proc/mounts
+ sudo umount -l /tmp/b
+ diff /tmp/m /proc/mounts
26d25
< localhost:/dev/shm /tmp/b nfs4 
rw,relatime,vers=4.0,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,clientaddr=127.0.0.1,local_lock=none,addr=127.0.0.1
 0 0
+ :
+ sync
+ sleep 1
+ cat /proc/mounts
+ sudo umount -l /tmp/c
general protection fault:  [#7] PREEMPT SMP
Modules linked in: oprofile configs autofs4 nfsd [last unloaded: brd]
CPU: 0 PID: 4325 Comm: umount.nfs Tainted: G  D 4.3.0-rc2aufsD+ #67
Hardware name: Pegatron Pegatron/IPM41, BIOS 0001 02/05/2009
task: 88002d69ea00 ti: 88002ca0 task.ti: 88002ca0
RIP: 0010:[]  [] sock_release+0x21/0x90
RSP: 0018:88002ca03bd8  EFLAGS: 00010202
RAX: 6b6b6b6b6b6b6b6b RBX: 88002812f7c0 RCX: 
RDX:  RSI:  RDI: 88002812f7c0
RBP: 88002ca03be8 R08:  R09: 
R10:  R11: 0001 R12: 
R13: 88002812f7c0 R14: 88002b8eeea0 R15: 0001
FS:  7f763d4f57e0() GS:88002fc0() knlGS:
CS:  0010 DS:  ES:  CR0: 8005003b
CR2: 01176db8 CR3: 2d76c000 CR4: 000406f0
Stack:
 88002b87  88002ca03c18 81715afc
 88002b87  88002b87 88002ca03d08
 88002ca03c38 81715bd6  88002b87
Call Trace:
 [] xs_reset_transport+0x18c/0x250
 [] xs_close+0x16/0x30
 [] xs_destroy+0x16/0x30
 [] xprt_destroy+0x6f/0x80
 [] xprt_put+0x14/0x20
 [] rpc_free_client+0x84/0xc0
 [] rpc_release_client+0x5a/0x90
 [] rpc_shutdown_client+0xf1/0x100
 [] nfs_free_client+0x97/0xa0
 [] nfs4_free_client+0xa4/0xc0
 [] nfs_put_client+0x295/0x430
 [] ? nfs4_alloc_client+0x380/0x380
 [] nfs_free_server+0x7c/0xd0
 [] nfs_kill_super+0x2c/0x40
 [] deactivate_locked_super+0x51/0x90
 [] deactivate_super+0x84/0x90
 [] cleanup_mnt+0x97/0xe0
 [] __cleanup_mnt+0x12/0x20
 [] task_work_run+0x72/0xa0
 [] prepare_exit_to_usermode+0x10b/0x150
 [] ? mntput_no_expire+0x5/0x2c0
 [] syscall_return_slowpath+0x96/0x2f0
 [] int_ret_from_sys_call+0x25/0x9f
Code: 5b 5d c3 0f 1f 80 00 00 00 00 66 66 66 66 90 55 48 89 e5 48 83 ec 10 48 
89 5d f0 48 89 fb 4c 89 65 f8 48 8b 47 28 48 85 c0 74 17 <4c> 8b 60 08 ff 50 10 
48 c7 43 28 00 00 00 00 4c 89 e7 e8 b8 7d 
RIP  [] sock_release+0x21/0x90
 RSP 
---[ end trace 1bcdd4036690d082 ]---
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
$
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Re: v4.3-rc2, fault in sock_release via nfs_put_client

2015-09-27 Thread Trond Myklebust 
On Sun, Sep 27, 2015 at 8:47 AM, J. R. Okajima  wrote:
>
>
> Hello NFS folks,
>
> I don't know whether this is a known issue or not (since I was off from
> development for a few months), but I've got a "general protection fault:
> " message from linux-4.3-rc2.
> Here are the reproducible script and the log.
> Would you check them please?
>
> Notes:
> - The script cannot reproduce the problem perfectly. Not always. But if
>   you try several times, you will able to see. On my test system, I had
>   to try a few times.
> - As far as I know, if bind-mount did not happen, then the problem did
>   not happen either. But I am not sure whether bind-mount is really the
>   trigger of this issue.
>
>
> J. R. Okajima
>
> --
> #!/bin/sh
>
> set -eu
>
> Stat() # path
> {
> stat -f --printf="%n %T\n" $1
> }
>
> uname -a
> s=/dev/shm
> Stat $s
> c=/tmp/c
> mkdir -p $c
> showmount -e > /tmp/e
> sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
> localhost:$s
> showmount -e | diff /tmp/e - || :
> sudo mount -t nfs localhost:$s $c
> Stat $c
> b=/tmp/b
> mkdir -p $b
> sudo mount -o bind $c $b
> Stat $b
> > $b/f
> cat /proc/mounts > /tmp/m
> sudo umount -l $b
> diff /tmp/m /proc/mounts || :
> sync
> sleep 1
> cat /proc/mounts > /tmp/m
> sudo umount -l $c
> diff /tmp/m /proc/mounts
> sudo exportfs -u localhost:$s
> showmount -e | diff /tmp/e -
> --
>
> $ sh -x ./nfs-4.3-rc2.sh
> + set -eu
> + s=/dev/shm
> + Stat /dev/shm
> + stat -f --printf=%n %T\n /dev/shm
> /dev/shm tmpfs
> + c=/tmp/c
> + mkdir -p /tmp/c
> + showmount -e
> + sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
> localhost:/dev/shm
> + showmount -e
> + diff /tmp/e -
> 3a4
> > /dev/shm localhost
> + :
> + sudo mount -t nfs localhost:/dev/shm /tmp/c
> + Stat /tmp/c
> + stat -f --printf=%n %T\n /tmp/c
> /tmp/c nfs
> + b=/tmp/b
> + mkdir -p /tmp/b
> + sudo mount -o bind /tmp/c /tmp/b
> + Stat /tmp/b
> + stat -f --printf=%n %T\n /tmp/b
> /tmp/b nfs
> +
> + cat /proc/mounts
> + sudo umount -l /tmp/b
> + diff /tmp/m /proc/mounts
> 26d25
> < localhost:/dev/shm /tmp/b nfs4 
> rw,relatime,vers=4.0,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,clientaddr=127.0.0.1,local_lock=none,addr=127.0.0.1
>  0 0
> + :
> + sync
> + sleep 1
> + cat /proc/mounts
> + sudo umount -l /tmp/c
> general protection fault:  [#7] PREEMPT SMP
> Modules linked in: oprofile configs autofs4 nfsd [last unloaded: brd]
> CPU: 0 PID: 4325 Comm: umount.nfs Tainted: G  D 4.3.0-rc2aufsD+ 
> #67
> Hardware name: Pegatron Pegatron/IPM41, BIOS 0001 02/05/2009
> task: 88002d69ea00 ti: 88002ca0 task.ti: 88002ca0
> RIP: 0010:[]  [] sock_release+0x21/0x90
> RSP: 0018:88002ca03bd8  EFLAGS: 00010202
> RAX: 6b6b6b6b6b6b6b6b RBX: 88002812f7c0 RCX: 
> RDX:  RSI:  RDI: 88002812f7c0
> RBP: 88002ca03be8 R08:  R09: 
> R10:  R11: 0001 R12: 
> R13: 88002812f7c0 R14: 88002b8eeea0 R15: 0001
> FS:  7f763d4f57e0() GS:88002fc0() knlGS:
> CS:  0010 DS:  ES:  CR0: 8005003b
> CR2: 01176db8 CR3: 2d76c000 CR4: 000406f0
> Stack:
>  88002b87  88002ca03c18 81715afc
>  88002b87  88002b87 88002ca03d08
>  88002ca03c38 81715bd6  88002b87
> Call Trace:
>  [] xs_reset_transport+0x18c/0x250
>  [] xs_close+0x16/0x30
>  [] xs_destroy+0x16/0x30
>  [] xprt_destroy+0x6f/0x80
>  [] xprt_put+0x14/0x20
>  [] rpc_free_client+0x84/0xc0
>  [] rpc_release_client+0x5a/0x90
>  [] rpc_shutdown_client+0xf1/0x100
>  [] nfs_free_client+0x97/0xa0
>  [] nfs4_free_client+0xa4/0xc0
>  [] nfs_put_client+0x295/0x430
>  [] ? nfs4_alloc_client+0x380/0x380
>  [] nfs_free_server+0x7c/0xd0
>  [] nfs_kill_super+0x2c/0x40
>  [] deactivate_locked_super+0x51/0x90
>  [] deactivate_super+0x84/0x90
>  [] cleanup_mnt+0x97/0xe0
>  [] __cleanup_mnt+0x12/0x20
>  [] task_work_run+0x72/0xa0
>  [] prepare_exit_to_usermode+0x10b/0x150
>  [] ? mntput_no_expire+0x5/0x2c0
>  [] syscall_return_slowpath+0x96/0x2f0
>  [] int_ret_from_sys_call+0x25/0x9f
> Code: 5b 5d c3 0f 1f 80 00 00 00 00 66 66 66 66 90 55 48 89 e5 48 83 ec 10 48 
> 89 5d f0 48 89 fb 4c 89 65 f8 48 8b 47 28 48 85 c0 74 17 <4c> 8b 60 08 ff 50 
> 10 48 c7 43 28 00 00 00 00 4c 89 e7 e8 b8 7d
> RIP  [] sock_release+0x21/0x90
>  RSP 
> ---[ end trace 1bcdd4036690d082 ]---
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted
> umount.nfs: /tmp/c: not mounted


There

Re: v4.3-rc2, fault in sock_release via nfs_put_client

2015-09-27 Thread J. R. Okajima 

Trond Myklebust:
> On Sun, Sep 27, 2015 at 8:47 AM, J. R. Okajima  wrote:
> > I don't know whether this is a known issue or not (since I was off from
> > development for a few months), but I've got a "general protection fault:
> > " message from linux-4.3-rc2.
:::
> There is a fix for this issue in v4.3-rc3. Please see
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79234c3db6842a3de03817211d891e0c2878f756

Thank you.
Confirmed the problem is gone.


J. R. Okajima
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

v4.3-rc2, fault in sock_release via nfs_put_client

2015-09-27 Thread J. R. Okajima 

Hello NFS folks,

I don't know whether this is a known issue or not (since I was off from
development for a few months), but I've got a "general protection fault:
" message from linux-4.3-rc2.
Here are the reproducible script and the log.
Would you check them please?

Notes:
- The script cannot reproduce the problem perfectly. Not always. But if
  you try several times, you will able to see. On my test system, I had
  to try a few times.
- As far as I know, if bind-mount did not happen, then the problem did
  not happen either. But I am not sure whether bind-mount is really the
  trigger of this issue.


J. R. Okajima

--
#!/bin/sh

set -eu

Stat() # path
{
stat -f --printf="%n %T\n" $1
}

uname -a
s=/dev/shm
Stat $s
c=/tmp/c
mkdir -p $c
showmount -e > /tmp/e
sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
localhost:$s
showmount -e | diff /tmp/e - || :
sudo mount -t nfs localhost:$s $c
Stat $c
b=/tmp/b
mkdir -p $b
sudo mount -o bind $c $b
Stat $b
> $b/f
cat /proc/mounts > /tmp/m
sudo umount -l $b
diff /tmp/m /proc/mounts || :
sync
sleep 1
cat /proc/mounts > /tmp/m
sudo umount -l $c
diff /tmp/m /proc/mounts
sudo exportfs -u localhost:$s
showmount -e | diff /tmp/e -
--

$ sh -x ./nfs-4.3-rc2.sh
+ set -eu
+ s=/dev/shm
+ Stat /dev/shm
+ stat -f --printf=%n %T\n /dev/shm
/dev/shm tmpfs
+ c=/tmp/c
+ mkdir -p /tmp/c
+ showmount -e
+ sudo exportfs -i -o rw,async,no_subtree_check,no_root_squash,fsid=99 
localhost:/dev/shm
+ showmount -e
+ diff /tmp/e -
3a4
> /dev/shm localhost
+ :
+ sudo mount -t nfs localhost:/dev/shm /tmp/c
+ Stat /tmp/c
+ stat -f --printf=%n %T\n /tmp/c
/tmp/c nfs
+ b=/tmp/b
+ mkdir -p /tmp/b
+ sudo mount -o bind /tmp/c /tmp/b
+ Stat /tmp/b
+ stat -f --printf=%n %T\n /tmp/b
/tmp/b nfs
+
+ cat /proc/mounts
+ sudo umount -l /tmp/b
+ diff /tmp/m /proc/mounts
26d25
< localhost:/dev/shm /tmp/b nfs4 
rw,relatime,vers=4.0,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,clientaddr=127.0.0.1,local_lock=none,addr=127.0.0.1
 0 0
+ :
+ sync
+ sleep 1
+ cat /proc/mounts
+ sudo umount -l /tmp/c
general protection fault:  [#7] PREEMPT SMP
Modules linked in: oprofile configs autofs4 nfsd [last unloaded: brd]
CPU: 0 PID: 4325 Comm: umount.nfs Tainted: G  D 4.3.0-rc2aufsD+ #67
Hardware name: Pegatron Pegatron/IPM41, BIOS 0001 02/05/2009
task: 88002d69ea00 ti: 88002ca0 task.ti: 88002ca0
RIP: 0010:[]  [] sock_release+0x21/0x90
RSP: 0018:88002ca03bd8  EFLAGS: 00010202
RAX: 6b6b6b6b6b6b6b6b RBX: 88002812f7c0 RCX: 
RDX:  RSI:  RDI: 88002812f7c0
RBP: 88002ca03be8 R08:  R09: 
R10:  R11: 0001 R12: 
R13: 88002812f7c0 R14: 88002b8eeea0 R15: 0001
FS:  7f763d4f57e0() GS:88002fc0() knlGS:
CS:  0010 DS:  ES:  CR0: 8005003b
CR2: 01176db8 CR3: 2d76c000 CR4: 000406f0
Stack:
 88002b87  88002ca03c18 81715afc
 88002b87  88002b87 88002ca03d08
 88002ca03c38 81715bd6  88002b87
Call Trace:
 [] xs_reset_transport+0x18c/0x250
 [] xs_close+0x16/0x30
 [] xs_destroy+0x16/0x30
 [] xprt_destroy+0x6f/0x80
 [] xprt_put+0x14/0x20
 [] rpc_free_client+0x84/0xc0
 [] rpc_release_client+0x5a/0x90
 [] rpc_shutdown_client+0xf1/0x100
 [] nfs_free_client+0x97/0xa0
 [] nfs4_free_client+0xa4/0xc0
 [] nfs_put_client+0x295/0x430
 [] ? nfs4_alloc_client+0x380/0x380
 [] nfs_free_server+0x7c/0xd0
 [] nfs_kill_super+0x2c/0x40
 [] deactivate_locked_super+0x51/0x90
 [] deactivate_super+0x84/0x90
 [] cleanup_mnt+0x97/0xe0
 [] __cleanup_mnt+0x12/0x20
 [] task_work_run+0x72/0xa0
 [] prepare_exit_to_usermode+0x10b/0x150
 [] ? mntput_no_expire+0x5/0x2c0
 [] syscall_return_slowpath+0x96/0x2f0
 [] int_ret_from_sys_call+0x25/0x9f
Code: 5b 5d c3 0f 1f 80 00 00 00 00 66 66 66 66 90 55 48 89 e5 48 83 ec 10 48 
89 5d f0 48 89 fb 4c 89 65 f8 48 8b 47 28 48 85 c0 74 17 <4c> 8b 60 08 ff 50 10 
48 c7 43 28 00 00 00 00 4c 89 e7 e8 b8 7d 
RIP  [] sock_release+0x21/0x90
 RSP 
---[ end trace 1bcdd4036690d082 ]---
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
umount.nfs: /tmp/c: not mounted
$
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