[     8.238452] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:480:6, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.250860] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:480:6, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.250860] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:481:21, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.284735] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:483:21, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.312840] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:480:6, member access within misaligned address 0xffffe9b9e6ec6026 for type 'struct in6_addr' which requires 4 byte alignment
[     8.337173] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:480:6, member access within misaligned address 0xffffe9b9e6ec6026 for type 'struct in6_addr' which requires 4 byte alignment
[     8.363198] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:404:6, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.388271] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:179:19, member access within misaligned address 0xffffe9b9e6ec6016 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.418032] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:180:24, member access within misaligned address 0xffffe9b9e6ec6016 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.443088] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:376:6, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.471444] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:376:6, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.499795] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:377:21, member access within misaligned address 0xffffe9b9e6ec6016 for type 'struct in6_addr' which requires 4 byte alignment
[     8.526180] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:192:19, member access within misaligned address 0xffffe9b9e6ec6026 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.552952] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:193:24, member access within misaligned address 0xffffe9b9e6ec6026 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.579594] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:376:6, member access within misaligned address 0xffffe9b9e6ec6026 for type 'struct in6_addr' which requires 4 byte alignment
[     8.608133] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/scope6.c:376:6, member access within misaligned address 0xffffe9b9e6ec6026 for type 'struct in6_addr' which requires 4 byte alignment
[     8.635574] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/in6_cksum.c:104:7, member access within misaligned address 0xffffe9b9e6ec6016 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.663998] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/in6_cksum.c:104:7, member access within misaligned address 0xffffe9b9e6ec6016 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.691018] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/in6_cksum.c:114:7, member access within misaligned address 0xffffe9b9e6ec6026 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.719601] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/in6_cksum.c:114:7, member access within misaligned address 0xffffe9b9e6ec6026 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.742881] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/in6_cksum.c:114:7, member access within misaligned address 0xffffe9b9e6ec6026 for type 'const struct in6_addr' which requires 4 byte alignment
[     8.751841] UBSan: Undefined Behavior in /media/k4iz3n/event1/kWork/src/sys/netinet6/in6.h:628:18, load of misaligned address 0xffffe9b9e6ec6016 for type 'const struct in6_addr' which requires 4 byte alignment


Index: sys/netinet6/in6.h
===================================================================
RCS file: /cvsroot/src/sys/netinet6/in6.h,v
retrieving revision 1.94
diff -u -r1.94 in6.h
--- sys/netinet6/in6.h	10 Dec 2018 16:28:52 -0000	1.94
+++ sys/netinet6/in6.h	27 May 2019 16:59:47 -0000
@@ -126,7 +126,7 @@
 		__uint16_t  __u6_addr16[8];
 		uint32_t  __u6_addr32[4];
 	} __u6_addr;			/* 128-bit IP6 address */
-};
+} __packed;
 
 #define s6_addr   __u6_addr.__u6_addr8
 #ifdef _KERNEL	/* XXX nonstandard */