diff --git a/0001-server-crypto.c-Fix-fallback-functions-used-when-gnu.patch b/0001-server-crypto.c-Fix-fallback-functions-used-when-gnu.patch
deleted file mode 100644
index 1ff262b..0000000
--- a/0001-server-crypto.c-Fix-fallback-functions-used-when-gnu.patch
+++ /dev/null
@@ -1,51 +0,0 @@
-From 7563596fdb7587dfb8708b5eeeb4b97d738ba79d Mon Sep 17 00:00:00 2001
-From: "Richard W.M. Jones" <rjones@redhat.com>
-Date: Wed, 24 Jul 2024 11:22:28 +0100
-Subject: [PATCH] server/crypto.c: Fix fallback functions used when gnutls is
- unavailable
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-The return value was wrong resulting in these errors:
-
-crypto.c: In function ‘nbdkit_peer_tls_dn’:
-crypto.c:945:3: error: return makes pointer from integer without a cast [-Werror]
-   return -1;
-   ^
-crypto.c: In function ‘nbdkit_peer_tls_issuer_dn’:
-crypto.c:953:3: error: return makes pointer from integer without a cast [-Werror]
-   return -1;
-   ^
-
-Fixes: commit a3759199c93300cf9de24a129c4141609dacb047
-Fixes: commit bf77f76112e3ffbc9149a54fbeb0a505310f28a2
----
- server/crypto.c | 4 ++--
- 1 file changed, 2 insertions(+), 2 deletions(-)
-
-diff --git a/server/crypto.c b/server/crypto.c
-index abdc4801..fa408c75 100644
---- a/server/crypto.c
-+++ b/server/crypto.c
-@@ -942,7 +942,7 @@ nbdkit_peer_tls_dn (void)
- {
-   nbdkit_error ("%s is not supported on this platform",
-                 "nbdkit_peer_tls_dn");
--  return -1;
-+  return NULL;
- }
- 
- NBDKIT_DLL_PUBLIC char *
-@@ -950,7 +950,7 @@ nbdkit_peer_tls_issuer_dn (void)
- {
-   nbdkit_error ("%s is not supported on this platform",
-                 "nbdkit_peer_tls_issuer_dn");
--  return -1;
-+  return NULL;
- }
- 
- #endif /* !HAVE_GNUTLS */
--- 
-2.43.0
-
diff --git a/0002-server-log-Move-preserve-errno-to-log_verror-functio.patch b/0002-server-log-Move-preserve-errno-to-log_verror-functio.patch
deleted file mode 100644
index 0986656..0000000
--- a/0002-server-log-Move-preserve-errno-to-log_verror-functio.patch
+++ /dev/null
@@ -1,149 +0,0 @@
-From f2c644d4495d5e75883ff729936102c90489e8d8 Mon Sep 17 00:00:00 2001
-From: "Richard W.M. Jones" <rjones@redhat.com>
-Date: Tue, 23 Jul 2024 14:46:41 +0100
-Subject: [PATCH] server: log: Move preserve errno to log_verror function
-
-This neutral code refactoring just moves the place where we preserve
-errno out one layer, but should have no other effect.
----
- server/internal.h   |  8 ++++----
- server/log-stderr.c |  9 ++-------
- server/log-syslog.c | 13 ++++---------
- server/log.c        | 12 ++++++++----
- 4 files changed, 18 insertions(+), 24 deletions(-)
-
-diff --git a/server/internal.h b/server/internal.h
-index 0b0507e4..1a783e3f 100644
---- a/server/internal.h
-+++ b/server/internal.h
-@@ -340,10 +340,10 @@ extern void free_debug_flags (void);
- extern void log_verror (const char *fs, va_list args);
- 
- /* log-*.c */
--extern void log_stderr_verror (const char *fs, va_list args)
--  ATTRIBUTE_FORMAT_PRINTF (1, 0);
--extern void log_syslog_verror (const char *fs, va_list args)
--  ATTRIBUTE_FORMAT_PRINTF (1, 0);
-+extern void log_stderr_verror (int orig_errno, const char *fs, va_list args)
-+  ATTRIBUTE_FORMAT_PRINTF (2, 0);
-+extern void log_syslog_verror (int orig_errno, const char *fs, va_list args)
-+  ATTRIBUTE_FORMAT_PRINTF (2, 0);
- 
- /* vfprintf.c */
- #if !HAVE_VFPRINTF_PERCENT_M
-diff --git a/server/log-stderr.c b/server/log-stderr.c
-index 8a55f5df..4d8b09da 100644
---- a/server/log-stderr.c
-+++ b/server/log-stderr.c
-@@ -43,12 +43,9 @@
- 
- #include "internal.h"
- 
--/* Note: preserves the previous value of errno. */
- void
--log_stderr_verror (const char *fs, va_list args)
-+log_stderr_verror (int orig_errno, const char *fs, va_list args)
- {
--  int err = errno;              /* must be first line of function */
--
-   const char *name = threadlocal_get_name ();
-   size_t instance_num = threadlocal_get_instance_num ();
-   int tty;
-@@ -69,7 +66,7 @@ log_stderr_verror (const char *fs, va_list args)
-   }
- 
-   fprintf (stderr, "error: ");
--  errno = err;                  /* must restore in case fs contains %m */
-+  errno = orig_errno;        /* must restore in case fs contains %m */
-   vfprintf (stderr, fs, args);
-   fprintf (stderr, "\n");
- 
-@@ -78,6 +75,4 @@ log_stderr_verror (const char *fs, va_list args)
- #ifdef HAVE_FUNLOCKFILE
-   funlockfile (stderr);
- #endif
--
--  errno = err;                  /* must be last line of function */
- }
-diff --git a/server/log-syslog.c b/server/log-syslog.c
-index 76c5035b..29a7a825 100644
---- a/server/log-syslog.c
-+++ b/server/log-syslog.c
-@@ -45,11 +45,9 @@
- /* Tempted to use LOG_FTP instead of LOG_DAEMON! */
- static const int PRIORITY = LOG_DAEMON|LOG_ERR;
- 
--/* Note: preserves the previous value of errno. */
- void
--log_syslog_verror (const char *fs, va_list args)
-+log_syslog_verror (int orig_errno, const char *fs, va_list args)
- {
--  int err = errno;
-   const char *name = threadlocal_get_name ();
-   size_t instance_num = threadlocal_get_instance_num ();
-   CLEANUP_FREE char *msg = NULL;
-@@ -59,9 +57,9 @@ log_syslog_verror (const char *fs, va_list args)
-   fp = open_memstream (&msg, &len);
-   if (fp == NULL) {
-     /* Fallback to logging using fs, args directly. */
--    errno = err; /* Must restore in case fs contains %m */
-+    errno = orig_errno;      /* must restore in case fs contains %m */
-     vsyslog (PRIORITY, fs, args);
--    goto out;
-+    return;
-   }
- 
-   if (name) {
-@@ -71,12 +69,9 @@ log_syslog_verror (const char *fs, va_list args)
-     fprintf (fp, ": ");
-   }
- 
--  errno = err; /* Must restore in case fs contains %m */
-+  errno = orig_errno;        /* must restore in case fs contains %m */
-   vfprintf (fp, fs, args);
-   close_memstream (fp);
- 
-   syslog (PRIORITY, "%s", msg);
--
-- out:
--  errno = err;
- }
-diff --git a/server/log.c b/server/log.c
-index 464e4f9a..9c1f667a 100644
---- a/server/log.c
-+++ b/server/log.c
-@@ -46,23 +46,27 @@
- void
- log_verror (const char *fs, va_list args)
- {
-+  int orig_errno = errno;
-+
-   switch (log_to) {
-   case LOG_TO_DEFAULT:
-     if (forked_into_background)
--      log_syslog_verror (fs, args);
-+      log_syslog_verror (orig_errno, fs, args);
-     else
--      log_stderr_verror (fs, args);
-+      log_stderr_verror (orig_errno, fs, args);
-     break;
-   case LOG_TO_SYSLOG:
--    log_syslog_verror (fs, args);
-+    log_syslog_verror (orig_errno, fs, args);
-     break;
-   case LOG_TO_STDERR:
--    log_stderr_verror (fs, args);
-+    log_stderr_verror (orig_errno, fs, args);
-     break;
-   case LOG_TO_NULL:
-     /* nothing */
-     break;
-   }
-+
-+  errno = orig_errno; /* Restore errno before leaving the function. */
- }
- 
- /* Note: preserves the previous value of errno. */
--- 
-2.43.0
-
diff --git a/0003-server-Rename-threadlocal_-set-get-_error-to-._errno.patch b/0003-server-Rename-threadlocal_-set-get-_error-to-._errno.patch
deleted file mode 100644
index 3e8468f..0000000
--- a/0003-server-Rename-threadlocal_-set-get-_error-to-._errno.patch
+++ /dev/null
@@ -1,175 +0,0 @@
-From 1d7f655726ad3483d0e8086741182aada7ae8595 Mon Sep 17 00:00:00 2001
-From: "Richard W.M. Jones" <rjones@redhat.com>
-Date: Wed, 24 Jul 2024 10:29:13 +0100
-Subject: [PATCH] server: Rename threadlocal_{set,get}_error to .._errno
-
-A simple mechanical change, to avoid confusion with
-threadlocal_{set,get}_last_error introduced in the following commit.
----
- server/internal.h    |  4 ++--
- server/plugins.c     | 27 +++++++++++++--------------
- server/protocol.c    |  5 +++--
- server/threadlocal.c |  4 ++--
- 4 files changed, 20 insertions(+), 20 deletions(-)
-
-diff --git a/server/internal.h b/server/internal.h
-index 1a783e3f..8102ccde 100644
---- a/server/internal.h
-+++ b/server/internal.h
-@@ -569,8 +569,8 @@ extern void threadlocal_set_name (const char *name)
- extern const char *threadlocal_get_name (void);
- extern void threadlocal_set_instance_num (size_t instance_num);
- extern size_t threadlocal_get_instance_num (void);
--extern void threadlocal_set_error (int err);
--extern int threadlocal_get_error (void);
-+extern void threadlocal_set_errno (int err);
-+extern int threadlocal_get_errno (void);
- extern void *threadlocal_buffer (size_t size);
- extern void threadlocal_set_conn (struct connection *conn);
- extern struct connection *threadlocal_get_conn (void);
-diff --git a/server/plugins.c b/server/plugins.c
-index ca89ac7a..3c7df0d2 100644
---- a/server/plugins.c
-+++ b/server/plugins.c
-@@ -633,15 +633,14 @@ plugin_can_cache (struct context *c)
- NBDKIT_DLL_PUBLIC void
- nbdkit_set_error (int err)
- {
--  threadlocal_set_error (err);
-+  threadlocal_set_errno (err);
- }
- 
--/* Grab the appropriate error value.
-- */
-+/* Grab the appropriate error value. */
- static int
--get_error (struct backend_plugin *p)
-+get_errno (struct backend_plugin *p)
- {
--  int ret = threadlocal_get_error ();
-+  int ret = threadlocal_get_errno ();
- 
-   if (!ret && p->plugin.errno_is_preserved != 0)
-     ret = errno;
-@@ -664,7 +663,7 @@ plugin_pread (struct context *c,
-   else
-     r = p->plugin._pread_v1 (c->handle, buf, count, offset);
-   if (r == -1)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-@@ -685,7 +684,7 @@ plugin_flush (struct context *c,
-     return -1;
-   }
-   if (r == -1)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-@@ -715,7 +714,7 @@ plugin_pwrite (struct context *c,
-   if (r != -1 && need_flush)
-     r = plugin_flush (c, 0, err);
-   if (r == -1 && !*err)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-@@ -744,7 +743,7 @@ plugin_trim (struct context *c,
-   if (r != -1 && need_flush)
-     r = plugin_flush (c, 0, err);
-   if (r == -1 && !*err)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-@@ -782,7 +781,7 @@ plugin_zero (struct context *c,
-     else
-       emulate = true;
-     if (r == -1)
--      *err = emulate ? EOPNOTSUPP : get_error (p);
-+      *err = emulate ? EOPNOTSUPP : get_errno (p);
-     if (r == 0 || (*err != EOPNOTSUPP && *err != ENOTSUP))
-       goto done;
-   }
-@@ -794,7 +793,7 @@ plugin_zero (struct context *c,
-   }
- 
-   flags &= ~NBDKIT_FLAG_MAY_TRIM;
--  threadlocal_set_error (0);
-+  threadlocal_set_errno (0);
-   *err = 0;
- 
-   while (count) {
-@@ -814,7 +813,7 @@ plugin_zero (struct context *c,
-   if (r != -1 && need_flush)
-     r = plugin_flush (c, 0, err);
-   if (r == -1 && !*err)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-@@ -839,7 +838,7 @@ plugin_extents (struct context *c,
-     r = -1;
-   }
-   if (r == -1)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-@@ -859,7 +858,7 @@ plugin_cache (struct context *c,
- 
-   r = p->plugin.cache (c->handle, count, offset, flags);
-   if (r == -1)
--    *err = get_error (p);
-+    *err = get_errno (p);
-   return r;
- }
- 
-diff --git a/server/protocol.c b/server/protocol.c
-index 9b63f789..677da05c 100644
---- a/server/protocol.c
-+++ b/server/protocol.c
-@@ -235,8 +235,9 @@ handle_request (uint16_t cmd, uint16_t flags, uint64_t offset, uint32_t count,
-   int err = 0;
- 
-   /* Clear the error, so that we know if the plugin calls
--   * nbdkit_set_error() or relied on errno.  */
--  threadlocal_set_error (0);
-+   * nbdkit_set_error() or relied on errno.
-+   */
-+  threadlocal_set_errno (0);
- 
-   switch (cmd) {
-   case NBD_CMD_READ:
-diff --git a/server/threadlocal.c b/server/threadlocal.c
-index 088fe55a..9bb656bc 100644
---- a/server/threadlocal.c
-+++ b/server/threadlocal.c
-@@ -154,7 +154,7 @@ threadlocal_get_instance_num (void)
- }
- 
- void
--threadlocal_set_error (int err)
-+threadlocal_set_errno (int err)
- {
-   struct threadlocal *threadlocal = pthread_getspecific (threadlocal_key);
- 
-@@ -167,7 +167,7 @@ threadlocal_set_error (int err)
- /* This preserves errno, for convenience.
-  */
- int
--threadlocal_get_error (void)
-+threadlocal_get_errno (void)
- {
-   int err = errno;
-   struct threadlocal *threadlocal = pthread_getspecific (threadlocal_key);
--- 
-2.43.0
-
diff --git a/0004-server-Introduce-threadlocal_-set-get-_last_error.patch b/0004-server-Introduce-threadlocal_-set-get-_last_error.patch
deleted file mode 100644
index 2443cc7..0000000
--- a/0004-server-Introduce-threadlocal_-set-get-_last_error.patch
+++ /dev/null
@@ -1,93 +0,0 @@
-From fa5055ae2b9f96af941d697de39198c96ee2580a Mon Sep 17 00:00:00 2001
-From: "Richard W.M. Jones" <rjones@redhat.com>
-Date: Wed, 24 Jul 2024 10:37:58 +0100
-Subject: [PATCH] server: Introduce threadlocal_{set,get}_last_error
-
-Plus a function to clear the last_error field.
----
- server/internal.h    |  3 +++
- server/threadlocal.c | 40 ++++++++++++++++++++++++++++++++++++++++
- 2 files changed, 43 insertions(+)
-
-diff --git a/server/internal.h b/server/internal.h
-index 8102ccde..c45384a6 100644
---- a/server/internal.h
-+++ b/server/internal.h
-@@ -571,6 +571,9 @@ extern void threadlocal_set_instance_num (size_t instance_num);
- extern size_t threadlocal_get_instance_num (void);
- extern void threadlocal_set_errno (int err);
- extern int threadlocal_get_errno (void);
-+extern void threadlocal_set_last_error (char *msg);
-+extern void threadlocal_clear_last_error (void);
-+extern const char *threadlocal_get_last_error (void);
- extern void *threadlocal_buffer (size_t size);
- extern void threadlocal_set_conn (struct connection *conn);
- extern struct connection *threadlocal_get_conn (void);
-diff --git a/server/threadlocal.c b/server/threadlocal.c
-index 9bb656bc..74a3c4e5 100644
---- a/server/threadlocal.c
-+++ b/server/threadlocal.c
-@@ -56,6 +56,7 @@ struct threadlocal {
-   char *name;                   /* Can be NULL. */
-   size_t instance_num;          /* Can be 0. */
-   int err;
-+  char *last_error;             /* Can be NULL. */
-   void *buffer;                 /* Can be NULL. */
-   size_t buffer_size;
-   struct connection *conn;      /* Can be NULL. */
-@@ -70,6 +71,7 @@ free_threadlocal (void *threadlocalv)
-   struct threadlocal *threadlocal = threadlocalv;
- 
-   free (threadlocal->name);
-+  free (threadlocal->last_error);
-   free (threadlocal->buffer);
-   free (threadlocal);
- }
-@@ -176,6 +178,44 @@ threadlocal_get_errno (void)
-   return threadlocal ? threadlocal->err : 0;
- }
- 
-+/* Set the last_error field.  The ownership of the 'msg' string is
-+ * passed to the threadlocal and will be freed here.
-+ */
-+void
-+threadlocal_set_last_error (char *msg)
-+{
-+  struct threadlocal *threadlocal = pthread_getspecific (threadlocal_key);
-+
-+  if (threadlocal) {
-+    free (threadlocal->last_error);
-+    threadlocal->last_error = msg;
-+  }
-+  else {
-+    /* ... otherwise throw it away, it's informational. */
-+    free (msg);
-+  }
-+}
-+
-+void
-+threadlocal_clear_last_error (void)
-+{
-+  threadlocal_set_last_error (NULL);
-+}
-+
-+/* Get the last_error field.  If successful, this returns a non-NULL
-+ * string.  This is valid until something calls nbdkit_error() in the
-+ * same thread, so it should be used quickly.  Returning NULL is not
-+ * necessarily an error.  The last_error is informational and may not
-+ * be available.
-+ */
-+const char *
-+threadlocal_get_last_error (void)
-+{
-+  struct threadlocal *threadlocal = pthread_getspecific (threadlocal_key);
-+
-+  return threadlocal ? threadlocal->last_error : NULL;
-+}
-+
- /* Return the single pread/pwrite buffer for this thread.  The buffer
-  * size is increased to ‘size’ bytes if required.
-  *
--- 
-2.43.0
-
diff --git a/0005-server-Take-a-thread-local-copy-of-the-last-call-to-.patch b/0005-server-Take-a-thread-local-copy-of-the-last-call-to-.patch
deleted file mode 100644
index 485a520..0000000
--- a/0005-server-Take-a-thread-local-copy-of-the-last-call-to-.patch
+++ /dev/null
@@ -1,93 +0,0 @@
-From bfa6d4064cb74f429149d14ab4025b258fc95ec4 Mon Sep 17 00:00:00 2001
-From: "Richard W.M. Jones" <rjones@redhat.com>
-Date: Tue, 23 Jul 2024 15:28:06 +0100
-Subject: [PATCH] server: Take a thread-local copy of the last call to
- nbdkit_error
-
-nbdkit_error has traditionally been a "fancy wrapper around fprintf"
-(kind of, don't take that literally).  It is encouraged that plugins
-and filters do something like:
-
-  if (error) {
-    nbdkit_error ("oops, a bad thing happened");
-    return -1;
-  }
-
-but we don't enforce this.  Plugins might call nbdkit_error more than
-once or not at all.
-
-The point where we get to sending an error back over the wire to the
-NBD client is long after the plugin returned above, and after
-nbdkit_error was called.
-
-Therefore in order to send errors back to the NBD client, we must keep
-the last error message around.
-
-This change simply modifies nbdkit_error to make a best-effort attempt
-to save the last error message in thread-local storage.
-
-We also clear the last error when a new request starts, to ensure that
-we don't leak errors across different callbacks or connections.
----
- server/log.c      | 21 +++++++++++++++++++++
- server/protocol.c |  5 +++++
- 2 files changed, 26 insertions(+)
-
-diff --git a/server/log.c b/server/log.c
-index 9c1f667a..acf14d57 100644
---- a/server/log.c
-+++ b/server/log.c
-@@ -40,6 +40,25 @@
- 
- #include "internal.h"
- 
-+/* Copy the error message to threadlocal.  This is sent to callers
-+ * which are using structured replies, but is for extra information
-+ * only so don't fail if we are unable to copy it.
-+ */
-+static void
-+copy_error_to_threadlocal (int orig_errno, const char *fs, va_list args)
-+{
-+  va_list args_copy;
-+  char *msg;
-+  int r;
-+
-+  va_copy (args_copy, args);
-+  errno = orig_errno;        /* must restore in case fs contains %m */
-+  r = vasprintf (&msg, fs, args_copy);
-+  va_end (args_copy);
-+  if (r != -1 && msg)
-+    threadlocal_set_last_error (msg); /* ownership passed to threadlocal */
-+}
-+
- /* Call the right log_*_verror function depending on log_sink.
-  * Note: preserves the previous value of errno.
-  */
-@@ -48,6 +67,8 @@ log_verror (const char *fs, va_list args)
- {
-   int orig_errno = errno;
- 
-+  copy_error_to_threadlocal (orig_errno, fs, args);
-+
-   switch (log_to) {
-   case LOG_TO_DEFAULT:
-     if (forked_into_background)
-diff --git a/server/protocol.c b/server/protocol.c
-index 677da05c..d428bfc8 100644
---- a/server/protocol.c
-+++ b/server/protocol.c
-@@ -239,6 +239,11 @@ handle_request (uint16_t cmd, uint16_t flags, uint64_t offset, uint32_t count,
-    */
-   threadlocal_set_errno (0);
- 
-+  /* Also clear the last error in this thread so we will only save
-+   * nbdkit_error() from this request.
-+   */
-+  threadlocal_clear_last_error ();
-+
-   switch (cmd) {
-   case NBD_CMD_READ:
-     if (backend_pread (c, buf, count, offset, 0, &err) == -1)
--- 
-2.43.0
-
diff --git a/0006-server-Send-the-last-error-to-the-NBD-client.patch b/0006-server-Send-the-last-error-to-the-NBD-client.patch
deleted file mode 100644
index 18b221d..0000000
--- a/0006-server-Send-the-last-error-to-the-NBD-client.patch
+++ /dev/null
@@ -1,175 +0,0 @@
-From 46484ca8e6a35c45fe96b6c972ceba8984d401e8 Mon Sep 17 00:00:00 2001
-From: "Richard W.M. Jones" <rjones@redhat.com>
-Date: Tue, 23 Jul 2024 15:45:04 +0100
-Subject: [PATCH] server: Send the last error to the NBD client
-
-This sends the last error saved in the connection handle back to the
-NBD client.  This is informational and best effort.
-
-qemu reports the error already, for example:
-
-  $ nbdkit --log=null \
-           eval open=' echo EPERM Go Away >&2; exit 1 ' get_size=' echo 100 ' \
-           --run 'qemu-img info "$uri"'
-  qemu-img: Could not open 'nbd+unix://?socket=/tmp/nbdkitIDl6iy/socket': Requested export not available
-  server reported: /tmp/nbdkitRDAfXH/open: Go Away
-
-This goes back to at least qemu 2.12.0 (RHEL 7) and possibly earlier,
-so we can just assume that qemu does this for the test.
-
-libnbd requires a patch to display this information.
----
- server/protocol-handshake-newstyle.c | 43 ++++++++++++++++------
- tests/Makefile.am                    |  2 +
- tests/test-last-error.sh             | 55 ++++++++++++++++++++++++++++
- 3 files changed, 88 insertions(+), 12 deletions(-)
- create mode 100755 tests/test-last-error.sh
-
-diff --git a/server/protocol-handshake-newstyle.c b/server/protocol-handshake-newstyle.c
-index 6b3bc76f..c18d32e5 100644
---- a/server/protocol-handshake-newstyle.c
-+++ b/server/protocol-handshake-newstyle.c
-@@ -57,28 +57,47 @@ send_newstyle_option_reply (uint32_t option, uint32_t reply)
- {
-   GET_CONN;
-   struct nbd_fixed_new_option_reply fixed_new_option_reply;
-+  const char *last_error = NULL;
-+  uint32_t replylen = 0;
-+
-+  if (NBD_REP_IS_ERR (reply)) {
-+    last_error = threadlocal_get_last_error ();
-+    /* Note that calling nbdkit_error will invalidate last_error, so
-+     * be careful below.
-+     */
-+    if (last_error) {
-+      size_t len = strlen (last_error);
-+      if (len <= NBD_MAX_STRING)
-+        replylen = len;
-+    }
-+  }
- 
-   fixed_new_option_reply.magic = htobe64 (NBD_REP_MAGIC);
-   fixed_new_option_reply.option = htobe32 (option);
-   fixed_new_option_reply.reply = htobe32 (reply);
--  fixed_new_option_reply.replylen = htobe32 (0);
-+  fixed_new_option_reply.replylen = htobe32 (replylen);
- 
-   debug ("replying to %s with %s", name_of_nbd_opt (option),
-          name_of_nbd_rep (reply));
-   if (conn->send (&fixed_new_option_reply,
--                  sizeof fixed_new_option_reply, 0) == -1) {
--    /* The protocol document says that the client is allowed to simply
--     * drop the connection after sending NBD_OPT_ABORT, or may read
--     * the reply.
--     */
--    if (option == NBD_OPT_ABORT)
--      debug ("write: %s: %m", name_of_nbd_opt (option));
--    else
--      nbdkit_error ("write: %s: %m", name_of_nbd_opt (option));
--    return -1;
--  }
-+                  sizeof fixed_new_option_reply,
-+                  replylen > 0 ? SEND_MORE : 0) == -1)
-+    goto err;
-+  if (replylen > 0 && conn->send (last_error, replylen, 0) == -1)
-+    goto err;
- 
-   return 0;
-+
-+err:
-+  /* The protocol document says that the client is allowed to simply
-+   * drop the connection after sending NBD_OPT_ABORT, or may read
-+   * the reply.
-+   */
-+  if (option == NBD_OPT_ABORT)
-+    debug ("write: %s: %m", name_of_nbd_opt (option));
-+  else
-+    nbdkit_error ("write: %s: %m", name_of_nbd_opt (option));
-+  return -1;
- }
- 
- /* Reply to NBD_OPT_LIST with the plugin's list of export names.
-diff --git a/tests/Makefile.am b/tests/Makefile.am
-index 8c7d6b8c..89c5fa9d 100644
---- a/tests/Makefile.am
-+++ b/tests/Makefile.am
-@@ -292,6 +292,7 @@ TESTS += \
- 	test-read-password-interactive.sh \
- 	test-nbd-client.sh \
- 	test-nbd-client-tls.sh \
-+	test-last-error.sh \
- 	$(NULL)
- if !IS_WINDOWS
- TESTS += \
-@@ -324,6 +325,7 @@ EXTRA_DIST += \
- 	test-help-plugin.sh \
- 	test-ipv4-lo.sh \
- 	test-ipv6-lo.sh \
-+	test-last-error.sh \
- 	test-long-name.sh \
- 	test-nbd-client-tls.sh \
- 	test-nbd-client.sh \
-diff --git a/tests/test-last-error.sh b/tests/test-last-error.sh
-new file mode 100755
-index 00000000..fc720606
---- /dev/null
-+++ b/tests/test-last-error.sh
-@@ -0,0 +1,55 @@
-+#!/usr/bin/env bash
-+# nbdkit
-+# Copyright Red Hat
-+#
-+# Redistribution and use in source and binary forms, with or without
-+# modification, are permitted provided that the following conditions are
-+# met:
-+#
-+# * Redistributions of source code must retain the above copyright
-+# notice, this list of conditions and the following disclaimer.
-+#
-+# * Redistributions in binary form must reproduce the above copyright
-+# notice, this list of conditions and the following disclaimer in the
-+# documentation and/or other materials provided with the distribution.
-+#
-+# * Neither the name of Red Hat nor the names of its contributors may be
-+# used to endorse or promote products derived from this software without
-+# specific prior written permission.
-+#
-+# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
-+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
-+# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
-+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
-+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
-+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-+# SUCH DAMAGE.
-+
-+source ./functions.sh
-+set -e
-+set -x
-+
-+# Test informational error messages sent to the NBD client.
-+# qemu-img supports this since at least 2.12.0.
-+
-+requires_run
-+requires_plugin eval
-+requires qemu-img --version
-+
-+out=last-error.out
-+rm -f $out
-+cleanup_fn rm -f $out
-+
-+export out
-+
-+nbdkit eval \
-+       open=' echo EPERM Go Away >&2; exit 1 ' get_size=' echo 0 ' \
-+       --run ' qemu-img info "$uri" > $out 2>&1 ||: '
-+cat $out
-+
-+grep "Go Away" $out
--- 
-2.43.0
-
diff --git a/nbdkit.spec b/nbdkit.spec
index 78ed7f3..de15f62 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -54,8 +54,8 @@
 %global source_directory 1.40-stable
 
 Name:           nbdkit
-Version:        1.40.0
-Release:        2%{?dist}
+Version:        1.40.4
+Release:        1%{?dist}
 Summary:        NBD server
 
 License:        BSD-3-Clause
@@ -80,12 +80,7 @@ Source3:        copy-patches.sh
 # https://gitlab.com/nbdkit/nbdkit/-/commits/rhel-10.0/
 
 # Patches.
-Patch0001:     0001-server-crypto.c-Fix-fallback-functions-used-when-gnu.patch
-Patch0002:     0002-server-log-Move-preserve-errno-to-log_verror-functio.patch
-Patch0003:     0003-server-Rename-threadlocal_-set-get-_error-to-._errno.patch
-Patch0004:     0004-server-Introduce-threadlocal_-set-get-_last_error.patch
-Patch0005:     0005-server-Take-a-thread-local-copy-of-the-last-call-to-.patch
-Patch0006:     0006-server-Send-the-last-error-to-the-NBD-client.patch
+#(nothing)
 
 # For automatic RPM Provides generation.
 # See: https://rpm-software-management.github.io/rpm/manual/dependency_generators.html
@@ -1503,6 +1498,9 @@ fi
 
 
 %changelog
+* Sat Sep 28 2024 Richard W.M. Jones <rjones@redhat.com> - 1.40.4-1
+- Rebase to nbdkit 1.40.4
+
 * Fri Jul 26 2024 Richard W.M. Jones <rjones@redhat.com> - 1.40.0-2
 - Rebase to nbdkit 1.40.0
   related: RHEL-49594
diff --git a/sources b/sources
index 623be89..4612e95 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (nbdkit-1.40.0.tar.gz) = 2ebf416359e61d4a7945ada095363fabfd300a3a9721a07ea39b0682c9d9e4dc0b8a9b1145e7992eca8605727d9c7a20c396295e3412e5e1bd246b903616a68d
-SHA512 (nbdkit-1.40.0.tar.gz.sig) = a3833dc96b241f77ea90bd2a13ec20aaa1e0d72c777fdf7d5dc73271b2df8e8649254b5cface74eddd5952feb9ef6c2191777153edb17674de68a7dabfad54eb
+SHA512 (nbdkit-1.40.4.tar.gz) = 043de0b6b686425d28b1410ac6ea75667eb189173648e78047174a45a76ce11137ca336d05af128314f5234b47e334d32dd6d196bdeb2b91da4688ee2c6bc273
+SHA512 (nbdkit-1.40.4.tar.gz.sig) = 9ae8e4cbdd9c6495ccbef6d71869e76951e2e72803fbbff4e9c2b66cd630874dd8fe5577be44c296c7b98936ddbe77c83fba3c92e8037e82d98a0503d378c49e