Running dpdk-test-compress-perf with compress_zlib2 virtual device and a
specific set of compression parameters causes a segmentation fault in
main_loop() at comp_perf_test_cyclecount.c:384.


Steps to Reproduce:
Environment:
OS: Ubuntu 24.04 (VERSION_ID="24.04")
Kernel: 6.8.0-60-generic
GCC: 14.2.0
DPDK: 24.11.2

run the below command line

sudo   build/app/dpdk-test-compress-perf --file-prefix=compress -l 3,4-7 
--vdev=compress_zlib2 --no-pci -v   --socket-mem 0 -- --ptest pmd-cyclecount 
--driver-name compress_zlib --input-file /home/amd/dpdk/test.img
--extended-input-sz 1048576 --seg-sz 59460 --burst-sz 32 --pool-sz 8192
--max-num-sgl-segs 1 --num-iter 2 --operation comp_and_decomp --algo deflate
--huffman-enc fixed --lz4-flags 01 --compress-level 1:1:9 --window-sz 15
--cc-delay-us 500

amd@automation-vm6:~/dpdk/dpdk-stable-24.11.2$ sudo  gdb --args 
build/app/dpdk-test-compress-perf --file-prefix=compress -l 3,4
--vdev=compress_zlib2 --no-pci -v   --socket-mem 0 -- --ptest pmd-cyclecount 
--driver-name compress_zlib --input-file /home/amd/dpdk/test.img
--extended-input-sz 1048576 --seg-sz 59460 --burst-sz 32 --pool-sz 8192
--max-num-sgl-segs 1 --num-iter 2 --operation comp_and_decomp --algo deflate
--huffman-enc fixed --lz4-flags 01 --compress-level 1:1:9 --window-sz 15
--cc-delay-us 500
[sudo] password for amd:
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Reading symbols from build/app/dpdk-test-compress-perf...
(gdb) r
Starting program:
/home/amd/dpdk/dpdk-stable-24.11.2/build/app/dpdk-test-compress-perf
--file-prefix=compress -l 3,4 --vdev=compress_zlib2 --no-pci -v --socket-mem 0
-- --ptest pmd-cyclecount --driver-name compress_zlib --input-file
/home/amd/dpdk/test.img --extended-input-sz 1048576 --seg-sz 59460 --burst-sz
32 --pool-sz 8192 --max-num-sgl-segs 1 --num-iter 2 --operation comp_and_decomp
--algo deflate --huffman-enc fixed --lz4-flags 01 --compress-level 1:1:9
--window-sz 15 --cc-delay-us 500
warning: could not find '.gnu_debugaltlink' file for
/lib/x86_64-linux-gnu/libmlx5.so.1
warning: could not find '.gnu_debugaltlink' file for
/lib/x86_64-linux-gnu/libmana.so.1
warning: could not find '.gnu_debugaltlink' file for
/lib/x86_64-linux-gnu/libmlx4.so.1
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
warning: could not find '.gnu_debugaltlink' file for
/lib/x86_64-linux-gnu/libcap.so.2
EAL: Detected CPU lcores: 8
EAL: Detected NUMA nodes: 1
EAL: RTE Version: 'DPDK 24.11.2'
EAL: Detected static linkage of DPDK
[New Thread 0x7ffff71d8400 (LWP 1042586)]
EAL: Multi-process socket /var/run/dpdk/compress/mp_socket
[New Thread 0x7ffff69d7400 (LWP 1042587)]
EAL: Selected IOVA mode 'PA'
[New Thread 0x7ffff51d5400 (LWP 1042588)]
[New Thread 0x7ffff49d4400 (LWP 1042589)]
USER1: 1048576 bytes read from file /home/amd/dpdk/test.img
App uses socket: 0
Burst size = 32
Input data size = 1048576
Cycle-count delay = 500 [us]

For the current input parameters (segment size = 59460, maximum segments per
SGL = 1):
        * Total number of buffers: 18
        * 17 buffer(s) 59460 bytes long, last buffer 65406 byte(s) long
        * Number of ops: 18
        * Total memory allocation: 1076226
        * 17 ops: 1 segment(s) in each, segment size 59460
        * 1 op (the last one): 1 segment 65406 byte(s) long


    lcore: 4, driver name: compress_zlib, device name: compress_zlib2, device
id: 0, socket id: 0, queue pair id: 0

Thread 4 "dpdk-worker4" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff51d5400 (LWP 1042588)]
0x000000000053f182 in main_loop (ctx=0x1002f92c0, type=RTE_COMP_COMPRESS) at
../app/test-compress-perf/comp_perf_test_cyclecount.c:384
384                                                     m->data_len =
data_to_append;
(gdb) p data_to_append
$1 = 53534
(gdb) p m->data_len
Cannot access memory at address 0x28
(gdb)


Analysis:
The crash occurs while accessing m->data_len, indicating that the m pointer (a
rte_mbuf*) is NULL or invalid.

Root cause appears to be a failure in allocation or initialization of the
rte_mbuf object before dereferencing.

The issue is reproducible consistently with the parameters provided.

As a temporary workaround, adding a NULL check on the m pointer bypasses the
crash, but it does not solve the underlying buffer allocation/management issue.