From 7f85b9ddb54cb3d83311daa7a72be27731be2806 Mon Sep 17 00:00:00 2001
From: Ilya Dryomov <idryomov@gmail.com>
Date: Sun, 8 Feb 2026 09:27:26 +0100
Subject: [PATCH] qa: krbd_rxbounce.sh: do more reads to generate more errors

On faster hardware having each thread do 1024 reads isn't always
sufficient for the "two orders of magnitude" threshold that is used in
the test.

Fixes: https://tracker.ceph.com/issues/74712
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
 qa/workunits/rbd/krbd_rxbounce.sh | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/qa/workunits/rbd/krbd_rxbounce.sh b/qa/workunits/rbd/krbd_rxbounce.sh
index ad00e3f96be..9dc2dc8e310 100755
--- a/qa/workunits/rbd/krbd_rxbounce.sh
+++ b/qa/workunits/rbd/krbd_rxbounce.sh
@@ -34,12 +34,16 @@ g++ -xc++ -o racereads - -lpthread <<EOF
 const int object_size = $OBJECT_SIZE;
 const int num_objects = $NUM_OBJECTS;
 const int read_len = $OP_SIZE;
-const int num_reads = 1024;
 
-int main() {
-  int fd = open("$DEV", O_DIRECT | O_RDONLY);
+int main(int argc, char** argv) {
+  assert(argc == 3);
+
+  int fd = open(argv[1], O_DIRECT | O_RDONLY);
   assert(fd >= 0);
 
+  int num_reads = atoi(argv[2]);
+  assert(num_reads > 0);
+
   void *buf;
   int r = posix_memalign(&buf, 512, read_len);
   assert(r == 0);
@@ -47,7 +51,7 @@ int main() {
   std::vector<std::thread> threads;
   for (int i = 0; i < num_objects; i++) {
     threads.emplace_back(
-        [fd, buf, read_off = static_cast<off_t>(i) * object_size]() {
+        [fd, num_reads, buf, read_off = static_cast<off_t>(i) * object_size]() {
           for (int i = 0; i < num_reads; i++) {
             auto len = pread(fd, buf, read_len, read_off);
             assert(len == read_len);
@@ -63,38 +67,38 @@ EOF
 
 DEV=$(sudo rbd map -o ms_mode=legacy img)
 sudo dmesg -C
-./racereads
+./racereads $DEV 100000
 [[ $(dmesg | grep -c 'libceph: osd.* bad crc/signature') -gt 100 ]]
 sudo rbd unmap $DEV
 
 DEV=$(sudo rbd map -o ms_mode=legacy,rxbounce img)
 sudo dmesg -C
-./racereads
+./racereads $DEV 100000
 [[ $(dmesg | grep -c 'libceph: osd.* bad crc/signature') -eq 0 ]]
 sudo rbd unmap $DEV
 
 DEV=$(sudo rbd map -o ms_mode=crc img)
 sudo dmesg -C
-./racereads
+./racereads $DEV 10000
 [[ $(dmesg | grep -c 'libceph: osd.* integrity error') -gt 100 ]]
 sudo rbd unmap $DEV
 
 DEV=$(sudo rbd map -o ms_mode=crc,rxbounce img)
 sudo dmesg -C
-./racereads
+./racereads $DEV 10000
 [[ $(dmesg | grep -c 'libceph: osd.* integrity error') -eq 0 ]]
 sudo rbd unmap $DEV
 
 # rxbounce is a no-op for secure mode
 DEV=$(sudo rbd map -o ms_mode=secure img)
 sudo dmesg -C
-./racereads
+./racereads $DEV 10000
 [[ $(dmesg | grep -c 'libceph: osd.* integrity error') -eq 0 ]]
 sudo rbd unmap $DEV
 
 DEV=$(sudo rbd map -o ms_mode=secure,rxbounce img)
 sudo dmesg -C
-./racereads
+./racereads $DEV 10000
 [[ $(dmesg | grep -c 'libceph: osd.* integrity error') -eq 0 ]]
 sudo rbd unmap $DEV
 
-- 
2.47.3