diff --git a/block-migration.c b/block-migration.c
index 8d06a23..0936c7d 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -671,7 +671,7 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
                 bs_prev = bs;
                 total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
                 if (total_sectors <= 0) {
-                    error_report("Error getting length of block device %s\n",
+                    error_report("Error getting length of block device %s",
                                  device_name);
                     return -EINVAL;
                 }
diff --git a/block/qcow2.c b/block/qcow2.c
index 2c51e7c..48e1b95 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -936,7 +936,7 @@ static int qcow2_create2(const char *filename, int64_t total_size,
         (1 << cluster_bits) != cluster_size)
     {
         error_report(
-            "Cluster size must be a power of two between %d and %dk\n",
+            "Cluster size must be a power of two between %d and %dk",
             1 << MIN_CLUSTER_BITS, 1 << (MAX_CLUSTER_BITS - 10));
         return -EINVAL;
     }
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 2180299..80d106c 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -444,7 +444,7 @@ static SheepdogAIOCB *sd_aio_setup(BlockDriverState *bs, QEMUIOVector *qiov,
 static int sd_schedule_bh(QEMUBHFunc *cb, SheepdogAIOCB *acb)
 {
     if (acb->bh) {
-        error_report("bug: %d %d\n", acb->aiocb_type, acb->aiocb_type);
+        error_report("bug: %d %d", acb->aiocb_type, acb->aiocb_type);
         return -EIO;
     }
 
@@ -592,7 +592,7 @@ static int connect_to_sdog(const char *addr, const char *port)
 
     ret = getaddrinfo(addr, port, &hints, &res0);
     if (ret) {
-        error_report("unable to get address info %s, %s\n",
+        error_report("unable to get address info %s, %s",
                      addr, strerror(errno));
         return -1;
     }
@@ -622,7 +622,7 @@ static int connect_to_sdog(const char *addr, const char *port)
         goto success;
     }
     fd = -1;
-    error_report("failed connect to %s:%s\n", addr, port);
+    error_report("failed connect to %s:%s", addr, port);
 success:
     freeaddrinfo(res0);
     return fd;
@@ -638,7 +638,7 @@ again:
         if (errno == EINTR || errno == EAGAIN) {
             goto again;
         }
-        error_report("failed to recv a rsp, %s\n", strerror(errno));
+        error_report("failed to recv a rsp, %s", strerror(errno));
         return 1;
     }
 
@@ -697,7 +697,7 @@ static int send_req(int sockfd, SheepdogReq *hdr, void *data,
 
     ret = do_writev(sockfd, iov, sizeof(*hdr) + *wlen, 0);
     if (ret) {
-        error_report("failed to send a req, %s\n", strerror(errno));
+        error_report("failed to send a req, %s", strerror(errno));
         ret = -1;
     }
 
@@ -717,7 +717,7 @@ static int do_req(int sockfd, SheepdogReq *hdr, void *data,
 
     ret = do_read(sockfd, hdr, sizeof(*hdr));
     if (ret) {
-        error_report("failed to get a rsp, %s\n", strerror(errno));
+        error_report("failed to get a rsp, %s", strerror(errno));
         ret = -1;
         goto out;
     }
@@ -729,7 +729,7 @@ static int do_req(int sockfd, SheepdogReq *hdr, void *data,
     if (*rlen) {
         ret = do_read(sockfd, data, *rlen);
         if (ret) {
-            error_report("failed to get the data, %s\n", strerror(errno));
+            error_report("failed to get the data, %s", strerror(errno));
             ret = -1;
             goto out;
         }
@@ -766,7 +766,7 @@ static void send_pending_req(BDRVSheepdogState *s, uint64_t oid, uint32_t id)
         ret = add_aio_request(s, aio_req, acb->qiov->iov,
                               acb->qiov->niov, 0, acb->aiocb_type);
         if (ret < 0) {
-            error_report("add_aio_request is failed\n");
+            error_report("add_aio_request is failed");
             free_aio_req(s, aio_req);
             if (QLIST_EMPTY(&acb->aioreq_head)) {
                 sd_finish_aiocb(acb);
@@ -799,7 +799,7 @@ static void aio_read_response(void *opaque)
     /* read a header */
     ret = do_read(fd, &rsp, sizeof(rsp));
     if (ret) {
-        error_report("failed to get the header, %s\n", strerror(errno));
+        error_report("failed to get the header, %s", strerror(errno));
         return;
     }
 
@@ -810,7 +810,7 @@ static void aio_read_response(void *opaque)
         }
     }
     if (!aio_req) {
-        error_report("cannot find aio_req %x\n", rsp.id);
+        error_report("cannot find aio_req %x", rsp.id);
         return;
     }
 
@@ -846,7 +846,7 @@ static void aio_read_response(void *opaque)
         ret = do_readv(fd, acb->qiov->iov, rsp.data_length,
                        aio_req->iov_offset);
         if (ret) {
-            error_report("failed to get the data, %s\n", strerror(errno));
+            error_report("failed to get the data, %s", strerror(errno));
             return;
         }
         break;
@@ -854,7 +854,7 @@ static void aio_read_response(void *opaque)
 
     if (rsp.result != SD_RES_SUCCESS) {
         acb->ret = -EIO;
-        error_report("%s\n", sd_strerror(rsp.result));
+        error_report("%s", sd_strerror(rsp.result));
     }
 
     rest = free_aio_req(s, aio_req);
@@ -911,7 +911,7 @@ static int get_sheep_fd(BDRVSheepdogState *s)
 
     fd = connect_to_sdog(s->addr, s->port);
     if (fd < 0) {
-        error_report("%s\n", strerror(errno));
+        error_report("%s", strerror(errno));
         return -1;
     }
 
@@ -919,7 +919,7 @@ static int get_sheep_fd(BDRVSheepdogState *s)
 
     ret = set_nodelay(fd);
     if (ret) {
-        error_report("%s\n", strerror(errno));
+        error_report("%s", strerror(errno));
         closesocket(fd);
         return -1;
     }
@@ -1035,7 +1035,7 @@ static int find_vdi_name(BDRVSheepdogState *s, char *filename, uint32_t snapid,
     }
 
     if (rsp->result != SD_RES_SUCCESS) {
-        error_report("cannot get vdi info, %s, %s %d %s\n",
+        error_report("cannot get vdi info, %s, %s %d %s",
                      sd_strerror(rsp->result), filename, snapid, tag);
         ret = -1;
         goto out;
@@ -1063,7 +1063,7 @@ static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
     uint64_t old_oid = aio_req->base_oid;
 
     if (!nr_copies) {
-        error_report("bug\n");
+        error_report("bug");
     }
 
     memset(&hdr, 0, sizeof(hdr));
@@ -1096,14 +1096,14 @@ static int add_aio_request(BDRVSheepdogState *s, AIOReq *aio_req,
     /* send a header */
     ret = do_write(s->fd, &hdr, sizeof(hdr));
     if (ret) {
-        error_report("failed to send a req, %s\n", strerror(errno));
+        error_report("failed to send a req, %s", strerror(errno));
         return -EIO;
     }
 
     if (wlen) {
         ret = do_writev(s->fd, iov, wlen, aio_req->iov_offset);
         if (ret) {
-            error_report("failed to send a data, %s\n", strerror(errno));
+            error_report("failed to send a data, %s", strerror(errno));
             return -EIO;
         }
     }
@@ -1145,7 +1145,7 @@ static int read_write_object(int fd, char *buf, uint64_t oid, int copies,
 
     ret = do_req(fd, (SheepdogReq *)&hdr, buf, &wlen, &rlen);
     if (ret) {
-        error_report("failed to send a request to the sheep\n");
+        error_report("failed to send a request to the sheep");
         return -1;
     }
 
@@ -1153,7 +1153,7 @@ static int read_write_object(int fd, char *buf, uint64_t oid, int copies,
     case SD_RES_SUCCESS:
         return 0;
     default:
-        error_report("%s\n", sd_strerror(rsp->result));
+        error_report("%s", sd_strerror(rsp->result));
         return -1;
     }
 }
@@ -1206,7 +1206,7 @@ static int sd_open(BlockDriverState *bs, const char *filename, int flags)
 
     fd = connect_to_sdog(s->addr, s->port);
     if (fd < 0) {
-        error_report("failed to connect\n");
+        error_report("failed to connect");
         goto out;
     }
 
@@ -1275,7 +1275,7 @@ static int do_sd_create(char *filename, int64_t vdi_size,
     }
 
     if (rsp->result != SD_RES_SUCCESS) {
-        error_report("%s, %s\n", sd_strerror(rsp->result), filename);
+        error_report("%s, %s", sd_strerror(rsp->result), filename);
         return -EIO;
     }
 
@@ -1302,7 +1302,7 @@ static int sd_create(const char *filename, QEMUOptionParameter *options)
     memset(vdi, 0, sizeof(vdi));
     memset(tag, 0, sizeof(tag));
     if (parse_vdiname(&s, filename, vdi, &snapid, tag) < 0) {
-        error_report("invalid filename\n");
+        error_report("invalid filename");
         return -EINVAL;
     }
 
@@ -1316,7 +1316,7 @@ static int sd_create(const char *filename, QEMUOptionParameter *options)
     }
 
     if (vdi_size > SD_MAX_VDI_SIZE) {
-        error_report("too big image size\n");
+        error_report("too big image size");
         return -EINVAL;
     }
 
@@ -1328,7 +1328,7 @@ static int sd_create(const char *filename, QEMUOptionParameter *options)
         /* Currently, only Sheepdog backing image is supported. */
         drv = bdrv_find_protocol(backing_file);
         if (!drv || strcmp(drv->protocol_name, "sheepdog") != 0) {
-            error_report("backing_file must be a sheepdog image\n");
+            error_report("backing_file must be a sheepdog image");
             return -EINVAL;
         }
 
@@ -1339,7 +1339,7 @@ static int sd_create(const char *filename, QEMUOptionParameter *options)
         s = bs->opaque;
 
         if (!is_snapshot(&s->inode)) {
-            error_report("cannot clone from a non snapshot vdi\n");
+            error_report("cannot clone from a non snapshot vdi");
             bdrv_delete(bs);
             return -EINVAL;
         }
@@ -1379,7 +1379,7 @@ static void sd_close(BlockDriverState *bs)
 
     if (!ret && rsp->result != SD_RES_SUCCESS &&
         rsp->result != SD_RES_VDI_NOT_LOCKED) {
-        error_report("%s, %s\n", sd_strerror(rsp->result), s->name);
+        error_report("%s, %s", sd_strerror(rsp->result), s->name);
     }
 
     qemu_aio_set_fd_handler(s->fd, NULL, NULL, NULL, NULL, NULL);
@@ -1401,10 +1401,10 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset)
     unsigned int datalen;
 
     if (offset < s->inode.vdi_size) {
-        error_report("shrinking is not supported\n");
+        error_report("shrinking is not supported");
         return -EINVAL;
     } else if (offset > SD_MAX_VDI_SIZE) {
-        error_report("too big image size\n");
+        error_report("too big image size");
         return -EINVAL;
     }
 
@@ -1421,7 +1421,7 @@ static int sd_truncate(BlockDriverState *bs, int64_t offset)
     close(fd);
 
     if (ret < 0) {
-        error_report("failed to update an inode.\n");
+        error_report("failed to update an inode.");
         return -EIO;
     }
 
@@ -1494,7 +1494,7 @@ static int sd_create_branch(BDRVSheepdogState *s)
 
     fd = connect_to_sdog(s->addr, s->port);
     if (fd < 0) {
-        error_report("failed to connect\n");
+        error_report("failed to connect");
         goto out;
     }
 
@@ -1612,7 +1612,7 @@ static void sd_readv_writev_bh_cb(void *p)
         ret = add_aio_request(s, aio_req, acb->qiov->iov, acb->qiov->niov,
                               create, acb->aiocb_type);
         if (ret < 0) {
-            error_report("add_aio_request is failed\n");
+            error_report("add_aio_request is failed");
             free_aio_req(s, aio_req);
             acb->ret = -EIO;
             goto out;
@@ -1689,7 +1689,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
 
     if (s->is_snapshot) {
         error_report("You can't create a snapshot of a snapshot VDI, "
-                     "%s (%" PRIu32 ").\n", s->name, s->inode.vdi_id);
+                     "%s (%" PRIu32 ").", s->name, s->inode.vdi_id);
 
         return -EINVAL;
     }
@@ -1712,7 +1712,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
     ret = write_object(fd, (char *)&s->inode, vid_to_vdi_oid(s->inode.vdi_id),
                        s->inode.nr_copies, datalen, 0, 0);
     if (ret < 0) {
-        error_report("failed to write snapshot's inode.\n");
+        error_report("failed to write snapshot's inode.");
         ret = -EIO;
         goto cleanup;
     }
@@ -1720,7 +1720,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
     ret = do_sd_create(s->name, s->inode.vdi_size, s->inode.vdi_id, &new_vid, 1,
                        s->addr, s->port);
     if (ret < 0) {
-        error_report("failed to create inode for snapshot. %s\n",
+        error_report("failed to create inode for snapshot. %s",
                      strerror(errno));
         ret = -EIO;
         goto cleanup;
@@ -1732,7 +1732,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
                       s->inode.nr_copies, datalen, 0);
 
     if (ret < 0) {
-        error_report("failed to read new inode info. %s\n", strerror(errno));
+        error_report("failed to read new inode info. %s", strerror(errno));
         ret = -EIO;
         goto cleanup;
     }
@@ -1771,14 +1771,14 @@ static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
 
     ret = find_vdi_name(s, vdi, snapid, tag, &vid, 1);
     if (ret) {
-        error_report("Failed to find_vdi_name\n");
+        error_report("Failed to find_vdi_name");
         ret = -ENOENT;
         goto out;
     }
 
     fd = connect_to_sdog(s->addr, s->port);
     if (fd < 0) {
-        error_report("failed to connect\n");
+        error_report("failed to connect");
         goto out;
     }
 
@@ -1796,7 +1796,7 @@ static int sd_snapshot_goto(BlockDriverState *bs, const char *snapshot_id)
     memcpy(&s->inode, buf, sizeof(s->inode));
 
     if (!s->inode.vm_state_size) {
-        error_report("Invalid snapshot\n");
+        error_report("Invalid snapshot");
         ret = -ENOENT;
         goto out;
     }
@@ -1813,7 +1813,7 @@ out:
     qemu_free(buf);
     qemu_free(old_s);
 
-    error_report("failed to open. recover old bdrv_sd_state.\n");
+    error_report("failed to open. recover old bdrv_sd_state.");
 
     return ret;
 }
@@ -1868,7 +1868,7 @@ static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
 
     fd = connect_to_sdog(s->addr, s->port);
     if (fd < 0) {
-        error_report("failed to connect\n");
+        error_report("failed to connect");
         goto out;
     }
 
@@ -1942,7 +1942,7 @@ static int do_load_save_vmstate(BDRVSheepdogState *s, uint8_t *data,
         }
 
         if (ret < 0) {
-            error_report("failed to save vmstate %s\n", strerror(errno));
+            error_report("failed to save vmstate %s", strerror(errno));
             ret = -EIO;
             goto cleanup;
         }
diff --git a/hw/milkymist-minimac2.c b/hw/milkymist-minimac2.c
index c4e2818..cd36026 100644
--- a/hw/milkymist-minimac2.c
+++ b/hw/milkymist-minimac2.c
@@ -234,20 +234,20 @@ static void minimac2_tx(MilkymistMinimac2State *s)
     uint8_t *buf = s->tx_buf;
 
     if (txcount < 64) {
-        error_report("milkymist_minimac2: ethernet frame too small (%u < %u)\n",
+        error_report("milkymist_minimac2: ethernet frame too small (%u < %u)",
                 txcount, 64);
         goto err;
     }
 
     if (txcount > MINIMAC2_MTU) {
-        error_report("milkymist_minimac2: MTU exceeded (%u > %u)\n",
+        error_report("milkymist_minimac2: MTU exceeded (%u > %u)",
                 txcount, MINIMAC2_MTU);
         goto err;
     }
 
     if (memcmp(buf, preamble_sfd, 8) != 0) {
         error_report("milkymist_minimac2: frame doesn't contain the preamble "
-                "and/or the SFD (%02x %02x %02x %02x %02x %02x %02x %02x)\n",
+                "and/or the SFD (%02x %02x %02x %02x %02x %02x %02x %02x)",
                 buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7]);
         goto err;
     }
diff --git a/hw/milkymist-pfpu.c b/hw/milkymist-pfpu.c
index 94e6315..306d1ce 100644
--- a/hw/milkymist-pfpu.c
+++ b/hw/milkymist-pfpu.c
@@ -301,7 +301,7 @@ static int pfpu_decode_insn(MilkymistPFPUState *s)
     } break;
 
     default:
-        error_report("milkymist_pfpu: unknown opcode %d\n", op);
+        error_report("milkymist_pfpu: unknown opcode %d", op);
         break;
     }
 
@@ -358,7 +358,7 @@ static void pfpu_start(MilkymistPFPUState *s)
                 /* decode at most MICROCODE_WORDS instructions */
                 if (i++ >= MICROCODE_WORDS) {
                     error_report("milkymist_pfpu: too many instructions "
-                            "executed in microcode. No VECTOUT?\n");
+                            "executed in microcode. No VECTOUT?");
                     break;
                 }
             }
diff --git a/hw/milkymist-softusb.c b/hw/milkymist-softusb.c
index 028f3b7..5ab35c3 100644
--- a/hw/milkymist-softusb.c
+++ b/hw/milkymist-softusb.c
@@ -131,7 +131,7 @@ static inline void softusb_read_dmem(MilkymistSoftUsbState *s,
 {
     if (offset + len >= s->dmem_size) {
         error_report("milkymist_softusb: read dmem out of bounds "
-                "at offset 0x%x, len %d\n", offset, len);
+                "at offset 0x%x, len %d", offset, len);
         return;
     }
 
@@ -143,7 +143,7 @@ static inline void softusb_write_dmem(MilkymistSoftUsbState *s,
 {
     if (offset + len >= s->dmem_size) {
         error_report("milkymist_softusb: write dmem out of bounds "
-                "at offset 0x%x, len %d\n", offset, len);
+                "at offset 0x%x, len %d", offset, len);
         return;
     }
 
@@ -155,7 +155,7 @@ static inline void softusb_read_pmem(MilkymistSoftUsbState *s,
 {
     if (offset + len >= s->pmem_size) {
         error_report("milkymist_softusb: read pmem out of bounds "
-                "at offset 0x%x, len %d\n", offset, len);
+                "at offset 0x%x, len %d", offset, len);
         return;
     }
 
@@ -167,7 +167,7 @@ static inline void softusb_write_pmem(MilkymistSoftUsbState *s,
 {
     if (offset + len >= s->pmem_size) {
         error_report("milkymist_softusb: write pmem out of bounds "
-                "at offset 0x%x, len %d\n", offset, len);
+                "at offset 0x%x, len %d", offset, len);
         return;
     }
 
diff --git a/hw/milkymist-tmu2.c b/hw/milkymist-tmu2.c
index 9cebe31..790cdcb 100644
--- a/hw/milkymist-tmu2.c
+++ b/hw/milkymist-tmu2.c
@@ -352,21 +352,21 @@ static uint32_t tmu2_read(void *opaque, target_phys_addr_t addr)
 static void tmu2_check_registers(MilkymistTMU2State *s)
 {
     if (s->regs[R_BRIGHTNESS] > MAX_BRIGHTNESS) {
-        error_report("milkymist_tmu2: max brightness is %d\n", MAX_BRIGHTNESS);
+        error_report("milkymist_tmu2: max brightness is %d", MAX_BRIGHTNESS);
     }
 
     if (s->regs[R_ALPHA] > MAX_ALPHA) {
-        error_report("milkymist_tmu2: max alpha is %d\n", MAX_ALPHA);
+        error_report("milkymist_tmu2: max alpha is %d", MAX_ALPHA);
     }
 
     if (s->regs[R_VERTICESADDR] & 0x07) {
         error_report("milkymist_tmu2: vertex mesh address has to be 64-bit "
-                "aligned\n");
+                "aligned");
     }
 
     if (s->regs[R_TEXFBUF] & 0x01) {
         error_report("milkymist_tmu2: texture buffer address has to be "
-                "16-bit aligned\n");
+                "16-bit aligned");
     }
 }
 
diff --git a/hw/qdev.c b/hw/qdev.c
index 2987901..292b52f 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -371,7 +371,7 @@ void qdev_init_nofail(DeviceState *dev)
     DeviceInfo *info = dev->info;
 
     if (qdev_init(dev) < 0) {
-        error_report("Initialization of device %s failed\n", info->name);
+        error_report("Initialization of device %s failed", info->name);
         exit(1);
     }
 }
diff --git a/hw/strongarm.c b/hw/strongarm.c
index de08bdf..0e03d61 100644
--- a/hw/strongarm.c
+++ b/hw/strongarm.c
@@ -1536,14 +1536,14 @@ StrongARMState *sa1110_init(unsigned int sdram_size, const char *rev)
     }
 
     if (strncmp(rev, "sa1110", 6)) {
-        error_report("Machine requires a SA1110 processor.\n");
+        error_report("Machine requires a SA1110 processor.");
         exit(1);
     }
 
     s->env = cpu_init(rev);
 
     if (!s->env) {
-        error_report("Unable to find CPU definition\n");
+        error_report("Unable to find CPU definition");
         exit(1);
     }
 
diff --git a/hw/usb-ccid.c b/hw/usb-ccid.c
index 59c6431..524b841 100644
--- a/hw/usb-ccid.c
+++ b/hw/usb-ccid.c
@@ -1240,7 +1240,7 @@ static int ccid_card_init(DeviceState *qdev, DeviceInfo *base)
         return -1;
     }
     if (s->card != NULL) {
-        error_report("Warning: usb-ccid card already full, not adding\n");
+        error_report("Warning: usb-ccid card already full, not adding");
         return -1;
     }
     ret = info->initfn ? info->initfn(card) : ret;
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 9a12104..bff4004 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -337,7 +337,7 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
     switch(cpkt.event) {
     case VIRTIO_CONSOLE_DEVICE_READY:
         if (!cpkt.value) {
-            error_report("virtio-serial-bus: Guest failure in adding device %s\n",
+            error_report("virtio-serial-bus: Guest failure in adding device %s",
                          vser->bus.qbus.name);
             break;
         }
@@ -352,7 +352,7 @@ static void handle_control_message(VirtIOSerial *vser, void *buf, size_t len)
 
     case VIRTIO_CONSOLE_PORT_READY:
         if (!cpkt.value) {
-            error_report("virtio-serial-bus: Guest failure in adding port %u for device %s\n",
+            error_report("virtio-serial-bus: Guest failure in adding port %u for device %s",
                          port->id, vser->bus.qbus.name);
             break;
         }
@@ -741,7 +741,7 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
     plugging_port0 = info->is_console && !find_port_by_id(port->vser, 0);
 
     if (find_port_by_id(port->vser, port->id)) {
-        error_report("virtio-serial-bus: A port already exists at id %u\n",
+        error_report("virtio-serial-bus: A port already exists at id %u",
                      port->id);
         return -1;
     }
@@ -752,7 +752,7 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
         } else {
             port->id = find_free_port_id(port->vser);
             if (port->id == VIRTIO_CONSOLE_BAD_ID) {
-                error_report("virtio-serial-bus: Maximum port limit for this device reached\n");
+                error_report("virtio-serial-bus: Maximum port limit for this device reached");
                 return -1;
             }
         }
@@ -760,7 +760,7 @@ static int virtser_port_qdev_init(DeviceState *qdev, DeviceInfo *base)
 
     max_nr_ports = tswap32(port->vser->config.max_nr_ports);
     if (port->id >= max_nr_ports) {
-        error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u\n",
+        error_report("virtio-serial-bus: Out-of-range port id specified, max. allowed: %u",
                      max_nr_ports - 1);
         return -1;
     }
diff --git a/hw/virtio.c b/hw/virtio.c
index e6043de..cc47a06 100644
--- a/hw/virtio.c
+++ b/hw/virtio.c
@@ -797,7 +797,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
             /* Check it isn't doing very strange things with descriptor numbers. */
             if (nheads > vdev->vq[i].vring.num) {
                 error_report("VQ %d size 0x%x Guest index 0x%x "
-                             "inconsistent with Host index 0x%x: delta 0x%x\n",
+                             "inconsistent with Host index 0x%x: delta 0x%x",
                              i, vdev->vq[i].vring.num,
                              vring_avail_idx(&vdev->vq[i]),
                              vdev->vq[i].last_avail_idx, nheads);
@@ -805,7 +805,7 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
             }
         } else if (vdev->vq[i].last_avail_idx) {
             error_report("VQ %d address 0x0 "
-                         "inconsistent with Host index 0x%x\n",
+                         "inconsistent with Host index 0x%x",
                          i, vdev->vq[i].last_avail_idx);
                 return -1;
 	}
diff --git a/net.c b/net.c
index a104976..66123ad 100644
--- a/net.c
+++ b/net.c
@@ -710,7 +710,7 @@ int qemu_find_nic_model(NICInfo *nd, const char * const *models,
             return i;
     }
 
-    error_report("qemu: Unsupported NIC model: %s", nd->model);
+    error_report("Unsupported NIC model: %s", nd->model);
     return -1;
 }
 
diff --git a/net/socket.c b/net/socket.c
index 7337f4f..bc1bf58 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -530,7 +530,7 @@ int net_init_socket(QemuOpts *opts,
             qemu_opt_get(opts, "connect") ||
             qemu_opt_get(opts, "mcast") ||
             qemu_opt_get(opts, "localaddr")) {
-            error_report("listen=, connect=, mcast= and localaddr= is invalid with fd=\n");
+            error_report("listen=, connect=, mcast= and localaddr= is invalid with fd=");
             return -1;
         }
 
@@ -550,7 +550,7 @@ int net_init_socket(QemuOpts *opts,
             qemu_opt_get(opts, "connect") ||
             qemu_opt_get(opts, "mcast") ||
             qemu_opt_get(opts, "localaddr")) {
-            error_report("fd=, connect=, mcast= and localaddr= is invalid with listen=\n");
+            error_report("fd=, connect=, mcast= and localaddr= is invalid with listen=");
             return -1;
         }
 
@@ -566,7 +566,7 @@ int net_init_socket(QemuOpts *opts,
             qemu_opt_get(opts, "listen") ||
             qemu_opt_get(opts, "mcast") ||
             qemu_opt_get(opts, "localaddr")) {
-            error_report("fd=, listen=, mcast= and localaddr= is invalid with connect=\n");
+            error_report("fd=, listen=, mcast= and localaddr= is invalid with connect=");
             return -1;
         }
 
diff --git a/qemu-error.c b/qemu-error.c
index 41c191d..4b20d28 100644
--- a/qemu-error.c
+++ b/qemu-error.c
@@ -193,6 +193,8 @@ void error_print_loc(void)
 
 /*
  * Print an error message to current monitor if we have one, else to stderr.
+ * Format arguments like sprintf().  The result should not contain
+ * newlines.
  * Prepend the current location and append a newline.
  * It's wrong to call this in a QMP monitor.  Use qerror_report() there.
  */
diff --git a/qemu-img.c b/qemu-img.c
index 4f162d1..1a37828 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -690,12 +690,12 @@ static int img_convert(int argc, char **argv)
 
     if (snapshot_name != NULL) {
         if (bs_n > 1) {
-            error_report("No support for concatenating multiple snapshot\n");
+            error_report("No support for concatenating multiple snapshot");
             ret = -1;
             goto out;
         }
         if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) {
-            error_report("Failed to load snapshot\n");
+            error_report("Failed to load snapshot");
             ret = -1;
             goto out;
         }
