diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 0c286635cf..5284bb68b6 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2356,7 +2356,7 @@ static bool vtd_process_iotlb_desc(IntelIOMMUState *s, VTDInvDesc *inv_desc)
     if ((inv_desc->lo & VTD_INV_DESC_IOTLB_RSVD_LO) ||
         (inv_desc->hi & VTD_INV_DESC_IOTLB_RSVD_HI)) {
         error_report_once("%s: invalid iotlb inv desc: hi=0x%"PRIx64
-                          ", lo=0x%"PRIx64" (reserved bits unzero)\n",
+                          ", lo=0x%"PRIx64" (reserved bits unzero)",
                           __func__, inv_desc->hi, inv_desc->lo);
         return false;
     }
@@ -2377,7 +2377,7 @@ static bool vtd_process_iotlb_desc(IntelIOMMUState *s, VTDInvDesc *inv_desc)
         am = VTD_INV_DESC_IOTLB_AM(inv_desc->hi);
         if (am > VTD_MAMV) {
             error_report_once("%s: invalid iotlb inv desc: hi=0x%"PRIx64
-                              ", lo=0x%"PRIx64" (am=%u > VTD_MAMV=%u)\n",
+                              ", lo=0x%"PRIx64" (am=%u > VTD_MAMV=%u)",
                               __func__, inv_desc->hi, inv_desc->lo,
                               am, (unsigned)VTD_MAMV);
             return false;
@@ -2387,7 +2387,7 @@ static bool vtd_process_iotlb_desc(IntelIOMMUState *s, VTDInvDesc *inv_desc)
 
     default:
         error_report_once("%s: invalid iotlb inv desc: hi=0x%"PRIx64
-                          ", lo=0x%"PRIx64" (type mismatch: 0x%llx)\n",
+                          ", lo=0x%"PRIx64" (type mismatch: 0x%llx)",
                           __func__, inv_desc->hi, inv_desc->lo,
                           inv_desc->lo & VTD_INV_DESC_IOTLB_G);
         return false;
diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index afdb8aa0c0..11f61294fc 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -281,7 +281,7 @@ static void milkymist_memcard_realize(DeviceState *dev, Error **errp)
     carddev = qdev_new(TYPE_SD_CARD);
     qdev_prop_set_drive(carddev, "drive", blk);
     if (!qdev_realize_and_unref(carddev, BUS(&s->sdbus), &err)) {
-        error_propagate_prepend(errp, err, "failed to init SD card: %s");
+        error_propagate_prepend(errp, err, "failed to init SD card");
         return;
     }
     s->enabled = blk && blk_is_inserted(blk);
diff --git a/include/qapi/error.h b/include/qapi/error.h
index 7932594dce..eaa05c4837 100644
--- a/include/qapi/error.h
+++ b/include/qapi/error.h
@@ -382,13 +382,15 @@ void error_propagate(Error **dst_errp, Error *local_err);
  * Please use ERRP_GUARD() and error_prepend() instead when possible.
  */
 void error_propagate_prepend(Error **dst_errp, Error *local_err,
-                             const char *fmt, ...);
+                             const char *fmt, ...)
+    GCC_FMT_ATTR(3, 4);
 
 /*
  * Prepend some text to @errp's human-readable error message.
  * The text is made by formatting @fmt, @ap like vprintf().
  */
-void error_vprepend(Error *const *errp, const char *fmt, va_list ap);
+void error_vprepend(Error *const *errp, const char *fmt, va_list ap)
+    GCC_FMT_ATTR(2, 0);
 
 /*
  * Prepend some text to @errp's human-readable error message.
diff --git a/scripts/coccinelle/err-bad-newline.cocci b/scripts/coccinelle/err-bad-newline.cocci
index 1316cc86a6..5394421873 100644
--- a/scripts/coccinelle/err-bad-newline.cocci
+++ b/scripts/coccinelle/err-bad-newline.cocci
@@ -1,22 +1,42 @@
 // Error messages should not contain newlines.  This script finds
 // messages that do.  Fixing them is manual.
 @r@
-expression errp, eno, cls, fmt;
+expression errp, err, eno, cls, fmt, ap;
 position p;
 @@
 (
+error_vreport(fmt, ap)@p
+|
+warn_vreport(fmt, ap)@p
+|
+info_vreport(fmt, ap)@p
+|
 error_report(fmt, ...)@p
 |
+warn_report(fmt, ...)@p
+|
+info_report(fmt, ...)@p
+|
+error_report_once(fmt, ...)@p
+|
+warn_report_once(fmt, ...)@p
+|
 error_setg(errp, fmt, ...)@p
 |
 error_setg_errno(errp, eno, fmt, ...)@p
 |
 error_setg_win32(errp, eno, cls, fmt, ...)@p
 |
+error_propagate_prepend(errp, err, fmt, ...)@p
+|
+error_vprepend(errp, fmt, ap)@p
+|
 error_prepend(errp, fmt, ...)@p
 |
 error_setg_file_open(errp, eno, cls, fmt, ...)@p
 |
+warn_reportf_err(errp, fmt, ...)@p
+|
 error_reportf_err(errp, fmt, ...)@p
 |
 error_set(errp, cls, fmt, ...)@p
@@ -26,4 +46,4 @@ fmt << r.fmt;
 p << r.p;
 @@
 if "\\n" in str(fmt):
-    print "%s:%s:%s:%s" % (p[0].file, p[0].line, p[0].column, fmt)
+    print("%s:%s:%s:%s" % (p[0].file, p[0].line, p[0].column, fmt))
diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
index e5baabf0e1..c31d21e6a9 100644
--- a/target/ppc/mmu-hash64.c
+++ b/target/ppc/mmu-hash64.c
@@ -859,7 +859,7 @@ static int build_vrma_slbe(PowerPCCPU *cpu, ppc_slb_t *slb)
     }
 
     error_report("Bad page size encoding in LPCR[VRMASD]; LPCR=0x"
-                 TARGET_FMT_lx"\n", lpcr);
+                 TARGET_FMT_lx, lpcr);
 
     return -1;
 }