diff --git a/NEWS b/NEWS
index fd5ba5e86..f28be7e8f 100644
--- a/NEWS
+++ b/NEWS
@@ -21,6 +21,10 @@ ver 0.21 (not yet released)
 ver 0.20.14 (not yet released)
 * database
   - simple: fix file corruption in the presence of mount points
+* archive
+  - bz2: fix deadlock
+  - reduce lock contention, fixing lots of xrun problems
+* fix Solaris build failure
 
 ver 0.20.13 (2017/12/18)
 * output
diff --git a/src/archive/plugins/Bzip2ArchivePlugin.cxx b/src/archive/plugins/Bzip2ArchivePlugin.cxx
index 3dc0b51c3..04597e2a2 100644
--- a/src/archive/plugins/Bzip2ArchivePlugin.cxx
+++ b/src/archive/plugins/Bzip2ArchivePlugin.cxx
@@ -162,7 +162,7 @@ Bzip2InputStream::FillBuffer()
 	if (bzstream.avail_in > 0)
 		return true;
 
-	size_t count = archive->istream->Read(buffer, sizeof(buffer));
+	size_t count = archive->istream->LockRead(buffer, sizeof(buffer));
 	if (count == 0)
 		return false;
 
@@ -174,6 +174,8 @@ Bzip2InputStream::FillBuffer()
 size_t
 Bzip2InputStream::Read(void *ptr, size_t length)
 {
+	const ScopeUnlock unlock(mutex);
+
 	int bz_result;
 	size_t nbytes = 0;
 
@@ -224,4 +226,3 @@ const ArchivePlugin bz2_archive_plugin = {
 	bz2_open,
 	bz2_extensions,
 };
-
diff --git a/src/archive/plugins/Iso9660ArchivePlugin.cxx b/src/archive/plugins/Iso9660ArchivePlugin.cxx
index 9e4c4f16a..536745d85 100644
--- a/src/archive/plugins/Iso9660ArchivePlugin.cxx
+++ b/src/archive/plugins/Iso9660ArchivePlugin.cxx
@@ -182,6 +182,8 @@ Iso9660ArchiveFile::OpenStream(const char *pathname,
 size_t
 Iso9660InputStream::Read(void *ptr, size_t read_size)
 {
+	const ScopeUnlock unlock(mutex);
+
 	int readed = 0;
 	int no_blocks, cur_block;
 	size_t left_bytes = statbuf->size - offset;
diff --git a/src/archive/plugins/ZzipArchivePlugin.cxx b/src/archive/plugins/ZzipArchivePlugin.cxx
index 5ba087f48..fc1e50b16 100644
--- a/src/archive/plugins/ZzipArchivePlugin.cxx
+++ b/src/archive/plugins/ZzipArchivePlugin.cxx
@@ -138,6 +138,8 @@ ZzipArchiveFile::OpenStream(const char *pathname,
 size_t
 ZzipInputStream::Read(void *ptr, size_t read_size)
 {
+	const ScopeUnlock unlock(mutex);
+
 	int ret = zzip_file_read(file, ptr, read_size);
 	if (ret < 0)
 		throw std::runtime_error("zzip_file_read() has failed");
@@ -155,6 +157,8 @@ ZzipInputStream::IsEOF() noexcept
 void
 ZzipInputStream::Seek(offset_type new_offset)
 {
+	const ScopeUnlock unlock(mutex);
+
 	zzip_off_t ofs = zzip_seek(file, new_offset, SEEK_SET);
 	if (ofs < 0)
 		throw std::runtime_error("zzip_seek() has failed");
diff --git a/src/util/WStringAPI.hxx b/src/util/WStringAPI.hxx
index e27f76bb8..6e3aa204d 100644
--- a/src/util/WStringAPI.hxx
+++ b/src/util/WStringAPI.hxx
@@ -103,11 +103,13 @@ UnsafeCopyStringP(wchar_t *dest, const wchar_t *src) noexcept
 {
 #if defined(_WIN32) || defined(__BIONIC__) || defined(__OpenBSD__) || \
 	defined(__NetBSD__)
-  /* emulate wcpcpy() */
-  UnsafeCopyString(dest, src);
-  return dest + StringLength(dest);
+	/* emulate wcpcpy() */
+	UnsafeCopyString(dest, src);
+	return dest + StringLength(dest);
+#elif defined(__sun) && defined (__SVR4)
+	return std::wcpcpy(dest, src);
 #else
-  return wcpcpy(dest, src);
+	return wcpcpy(dest, src);
 #endif
 }
 
@@ -159,7 +161,11 @@ gcc_malloc gcc_returns_nonnull gcc_nonnull_all
 static inline wchar_t *
 DuplicateString(const wchar_t *p)
 {
+#if defined(__sun) && defined (__SVR4)
+	return std::wcsdup(p);
+#else
 	return wcsdup(p);
+#endif
 }
 
 #endif