Hi -

The wireguard dkms build failed with a recent Ubuntu 16.04 kernel upgrade
4.4.0-161-generic.  The build was successful with the previous kernel
4.4.0-159-generic.

---

* dkms: running auto installation service for kernel 4.4.0-161-generic

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area....
make KERNELRELEASE=4.4.0-161-generic -C
/lib/modules/4.4.0-161-generic/build
M=/var/lib/dkms/wireguard/0.0.20190702/build......(bad exit status: 2)
ERROR: Cannot create report: [Errno 17] File exists:
'/var/crash/wireguard-dkms.0.crash'
Error! Bad return status for module build on kernel: 4.4.0-161-generic
(x86_64)
Consult /var/lib/dkms/wireguard/0.0.20190702/build/make.log for more
information.
   ...done.

---

$ cat /var/crash/wireguard-dkms.0.crash
ProblemType: Package
DKMSBuildLog:
 DKMS make.log for wireguard-0.0.20190702 for kernel 4.4.0-161-generic
(x86_64)
 Mon Sep  2 18:20:16 EDT 2019
 make: Entering directory '/usr/src/linux-headers-4.4.0-161-generic'
   LD      /var/lib/dkms/wireguard/0.0.20190702/build/built-in.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/main.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/noise.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/device.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/peer.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/timers.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/queueing.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/send.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/receive.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/socket.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/peerlookup.o
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.o
 /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c: In function
‘root_remove_peer_lists’:
 /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c:72:1: warning: the
frame size of 1048 bytes is larger than 1024 bytes [-Wframe-larger-than=]
  }
  ^
 /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c: In function
‘root_free_rcu’:
 /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c:59:1: warning: the
frame size of 1048 bytes is larger than 1024 bytes [-Wframe-larger-than=]
  }
  ^
 /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c: In function
‘walk_remove_by_peer.isra.3’:
 /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c:126:1: warning:
the frame size of 1032 bytes is larger than 1024 bytes
[-Wframe-larger-than=]
  }
  ^
   CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:25:8: error:
unknown type name ‘hsiphash_key_t’
  static hsiphash_key_t key;
         ^
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c: In function
‘wg_ratelimiter_allow’:
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:109:22: error:
implicit declaration of function ‘hsiphash_2u32’
[-Werror=implicit-function-declaration]
    bucket = &table_v4[hsiphash_2u32(net_word, ip, &key) &
                       ^
 /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:116:22: error:
implicit declaration of function ‘hsiphash_3u32’
[-Werror=implicit-function-declaration]
    bucket = &table_v6[hsiphash_3u32(net_word, ip >> 32, ip, &key) &
                       ^
 cc1: some warnings being treated as errors
 scripts/Makefile.build:285: recipe for target
'/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o' failed
 make[1]: *** [/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o]
Error 1
 Makefile:1454: recipe for target
'_module_/var/lib/dkms/wireguard/0.0.20190702/build' failed
 make: *** [_module_/var/lib/dkms/wireguard/0.0.20190702/build] Error 2
 make: Leaving directory '/usr/src/linux-headers-4.4.0-161-generic'
DKMSKernelVersion: 4.4.0-161-generic
Date: Mon Sep  2 18:20:27 2019
DuplicateSignature:
dkms:wireguard-dkms:0.0.20190702-wg1~xenial:/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:25:8:
error: unknown type name ‘hsiphash_key_t’
Package: wireguard-dkms 0.0.20190702-wg1~xenial
PackageVersion: 0.0.20190702-wg1~xenial
SourcePackage: wireguard
Title: wireguard-dkms 0.0.20190702-wg1~xenial: wireguard kernel module
failed to build

---

$ cat  /var/lib/dkms/wireguard/0.0.20190702/build/make.log
DKMS make.log for wireguard-0.0.20190702 for kernel 4.4.0-161-generic
(x86_64)
Tue Sep  3 15:36:39 EDT 2019
make: Entering directory '/usr/src/linux-headers-4.4.0-161-generic'
  LD      /var/lib/dkms/wireguard/0.0.20190702/build/built-in.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/main.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/noise.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/device.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/peer.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/timers.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/queueing.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/send.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/receive.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/socket.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/peerlookup.o
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/allowedips.o
/var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c: In function
‘root_remove_peer_lists’:
/var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c:72:1: warning: the
frame size of 1048 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
/var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c: In function
‘root_free_rcu’:
/var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c:59:1: warning: the
frame size of 1048 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
/var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c: In function
‘walk_remove_by_peer.isra.3’:
/var/lib/dkms/wireguard/0.0.20190702/build/allowedips.c:126:1: warning: the
frame size of 1032 bytes is larger than 1024 bytes [-Wframe-larger-than=]
 }
 ^
  CC [M]  /var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o
/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:25:8: error:
unknown type name ‘hsiphash_key_t’
 static hsiphash_key_t key;
        ^
/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c: In function
‘wg_ratelimiter_allow’:
/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:109:22: error:
implicit declaration of function ‘hsiphash_2u32’
[-Werror=implicit-function-declaration]
   bucket = &table_v4[hsiphash_2u32(net_word, ip, &key) &
                      ^
/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.c:116:22: error:
implicit declaration of function ‘hsiphash_3u32’
[-Werror=implicit-function-declaration]
   bucket = &table_v6[hsiphash_3u32(net_word, ip >> 32, ip, &key) &
                      ^
cc1: some warnings being treated as errors
scripts/Makefile.build:285: recipe for target
'/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o' failed
make[1]: *** [/var/lib/dkms/wireguard/0.0.20190702/build/ratelimiter.o]
Error 1
Makefile:1454: recipe for target
'_module_/var/lib/dkms/wireguard/0.0.20190702/build' failed
make: *** [_module_/var/lib/dkms/wireguard/0.0.20190702/build] Error 2
make: Leaving directory '/usr/src/linux-headers-4.4.0-161-generic'

--
# lsb_release --all
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.6 LTS
Release:        16.04
Codename:       xenial
---

# apt list |grep wireguard|grep installed
wireguard-dkms/xenial,xenial,now 0.0.20190702-wg1~xenial all
[installed,automatic]
wireguard-tools/xenial,now 0.0.20190702-wg1~xenial amd64 [installed]