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Re: make -j check failing on master, interesting valgrind errors on qos-
From: |
Claudio Fontana |
Subject: |
Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic |
Date: |
Thu, 26 May 2022 20:18:19 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 |
On 5/26/22 8:06 PM, Claudio Fontana wrote:
> Hi all,
>
> I am seeing intermittent failures of make -j check on master.
>
> I am using gcc 7.5.0, make 4.2.1, meson 0.61.4, ninja-1.10.0
>
> I tried these two configurations:
>
> $ ../configure
>
> $ ../configure --disable-tcg --enable-kvm
>
> and the errors seem to appear in both cases, saltuarily, triggering in
> different test paths:
>
> $ make -j
> $ make -j check
>
> 545/581 ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child
> process
> (/i386/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/flags-mismatch/subprocess
> [100495]) failed unexpectedly ERROR
> 545/581 qemu:qtest+qtest-i386 / qtest-i386/qos-test
> ERROR 20.74s killed by signal 6 SIGABRT
>>>> G_TEST_DBUS_DAEMON=/vm_images/gehc/git/qemu/tests/dbus-vmstate-daemon.sh
>>>> QTEST_QEMU_IMG=./qemu-img
>>>> QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon
>>>> MALLOC_PERTURB_=140 QTEST_QEMU_BINARY=./qemu-system-i386
>>>> /vm_images/gehc/git/qemu/build/tests/qtest/qos-test --tap -k
> ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― ✀
> ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
> stderr:
> **
> ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child process
> (/i386/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/flags-mismatch/subprocess
> [100495]) failed unexpectedly
> (test program exited with status code -6)
>
>
> or
>
>
> ▶ 208/218 ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child
> process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [3995]) failed unexpectedly ERROR
> 208/218 qemu:qtest+qtest-x86_64 / qtest-x86_64/qos-test
> ERROR 14.19s killed by signal 6 SIGABRT
>>>> G_TEST_DBUS_DAEMON=/vm_images/gehc/git/qemu/tests/dbus-vmstate-daemon.sh
>>>> QTEST_QEMU_IMG=./qemu-img QTEST_QEMU_BINARY=./qemu-system-x86_64
>>>> MALLOC_PERTURB_=248
>>>> QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon
>>>> /vm_images/gehc/git/qemu/build/tests/qtest/qos-test --tap -k
> ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― ✀
> ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
> stderr:
> **
> ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [3995]) failed unexpectedly
>
> (test program exited with status code -6)
> ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――
>
>
>
> I ran the tests manually a few times directly with:
>
> $ G_TEST_DBUS_DAEMON=/vm_images/gehc/git/qemu/tests/dbus-vmstate-daemon.sh
> QTEST_QEMU_IMG=./qemu-img QTEST_QEMU_BINARY=./qemu-system-x86_64
> MALLOC_PERTURB_=248
> QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon
> /vm_images/gehc/git/qemu/build/tests/qtest/qos-test --tap -k
>
> and I get (saltuarily again):
>
> # Start of vhost-user tests
> # GLib-DEBUG: posix_spawn avoided (workdir specified) (fd close requested)
> ok 62
> /x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/migrate
> # GLib-DEBUG: posix_spawn avoided (workdir specified) (fd close requested)
> # child process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [15058]) exit status: 1 (error)
> # child process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [15058]) stdout: ""
> # child process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [15058]) stderr: "qemu-system-x86_64: -chardev
> socket,id=chr-reconnect,path=/tmp/vhost-test-qvwhvM/reconnect.sock,server=on:
> info: QEMU waiting for connection on:
> disconnected:unix:/tmp/vhost-test-qvwhvM/reconnect.sock,server=on\nqemu-system-x86_64:
> Failed to set msg fds.\nqemu-system-x86_64: vhost VQ 0 ring restore failed:
> -22: Invalid argument (22)\nqemu-system-x86_64: Failed to set msg
> fds.\nqemu-system-x86_64: vhost VQ 1 ring restore failed: -22: Invalid
> argument
> (22)\n**\nERROR:../tests/qtest/vhost-user-test.c:810:wait_for_rings_started:
> assertion failed (ctpop64(s->rings) == count): (1 == 2)\n"
> **
> ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [15058]) failed unexpectedly
> Bail out! ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child
> process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [15058]) failed unexpectedly
> Aborted (core dumped)
>
>
> gdb -core, bt:
>
> #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
> #1 0x00007f193e9abadf in __GI_abort () at abort.c:100
> #2 0x00007f193faf2165 in g_assertion_message (domain=domain@entry=0x0,
> file=file@entry=0x560e358c3c16 "../tests/qtest/qos-test.c",
> line=line@entry=189, func=func@entry=0x560e358c3d50 <__func__.30035>
> "subprocess_run_one_test",
> message=message@entry=0x560e35f82400 "child process
> (/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
> [18063]) failed unexpectedly") at ../glib/gtestutils.c:2913
> #3 0x00007f193faf2b9a in g_test_trap_assertions (domain=0x0,
> file=0x560e358c3c16 "../tests/qtest/qos-test.c", line=189,
> func=0x560e358c3d50 <__func__.30035> "subprocess_run_one_test",
> assertion_flags=<optimized out>, pattern=<optimized out>)
> at ../glib/gtestutils.c:3673
> #4 0x00007f193faf1a66 in test_case_run (tc=0x560e35f6ead0) at
> ../glib/gtestutils.c:2632
> #5 g_test_run_suite_internal (suite=suite@entry=0x560e35faae00,
> path=path@entry=0x0) at ../glib/gtestutils.c:2720
> #6 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa9c00, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #7 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa9ec0, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #8 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa85a0, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #9 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa7100, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #10 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa7140, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #11 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa7160, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #12 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa7080, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #13 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35fa7180, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #14 0x00007f193faf197b in g_test_run_suite_internal
> (suite=suite@entry=0x560e35f26640, path=path@entry=0x0) at
> ../glib/gtestutils.c:2732
> #15 0x00007f193faf1f22 in g_test_run_suite (suite=0x560e35f26640) at
> ../glib/gtestutils.c:2807
> #16 0x00007f193faf1f41 in g_test_run () at ../glib/gtestutils.c:2042
> #17 0x0000560e358191e9 in main (argc=<optimized out>, argv=<optimized out>,
> envp=<optimized out>) at ../tests/qtest/qos-test.c:338
>
> I tried to valgrind a bit the qos-test itself and I got an interesting result
> for vhost-user-blk-test/basic.
> I guess some memory corruption in a preceding test could make tests that
> follow fail?
Forget about his aspect, I think it is a separate problem.
valgind of qos-test when run restricted to those specific paths (-p
/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect
for example)
shows all clear,
and still the test fails when run in a while loop after a few attempts:
while G_TEST_DBUS_DAEMON=/vm_images/gehc/git/qemu/tests/dbus-vmstate-daemon.sh
QTEST_QEMU_IMG=./qemu-img QTEST_QEMU_BINARY=./qemu-system-x86_64
MALLOC_PERTURB_=248
QTEST_QEMU_STORAGE_DAEMON_BINARY=./storage-daemon/qemu-storage-daemon
/vm_images/gehc/git/qemu/build/tests/qtest/qos-test --tap -k -p
/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect
; do echo "************************"; done
==23948== Memcheck, a memory error detector
==23948== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==23948== Using Valgrind-3.17.0 and LibVEX; rerun with -h for copyright info
==23948== Command: /vm_images/gehc/git/qemu/build/tests/qtest/qos-test-real
--tap -k -p
/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect
==23948==
# random seed: R02S1d5bde212d220a83538cd14e01480c4a
# starting QEMU: exec ./qemu-system-x86_64 -qtest unix:/tmp/qtest-23948.sock
-qtest-log /dev/null -chardev socket,path=/tmp/qtest-23948.qmp,id=char0 -mon
chardev=char0,mode=control -display none -machine none -accel qtest
# Start of x86_64 tests
# Start of pc tests
# Start of i440FX-pcihost tests
# Start of pci-bus-pc tests
# Start of pci-bus tests
# Start of virtio-net-pci tests
# Start of virtio-net tests
# Start of virtio-net-tests tests
# Start of vhost-user tests
# GLib-DEBUG: posix_spawn avoided (workdir specified) (fd close requested)
ok 1
/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect
# Start of reconnect tests
# End of reconnect tests
# End of vhost-user tests
# End of virtio-net-tests tests
# End of virtio-net tests
# End of virtio-net-pci tests
# End of pci-bus tests
# End of pci-bus-pc tests
# End of i440FX-pcihost tests
# End of pc tests
# End of x86_64 tests
1..1
==23948==
==23948== HEAP SUMMARY:
==23948== in use at exit: 140,152 bytes in 1,198 blocks
==23948== total heap usage: 151,072 allocs, 149,874 frees, 7,113,381 bytes
allocated
==23948==
==23948== For a detailed leak analysis, rerun with: --leak-check=full
==23948==
==23948== For lists of detected and suppressed errors, rerun with: -s
==23948== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
************************
....
# child process
(/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
[24153]) exit status: 1 (error)
# child process
(/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
[24153]) stdout: ""
# child process
(/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
[24153]) stderr: "qemu-system-x86_64: -chardev
socket,id=chr-reconnect,path=/tmp/vhost-test-aK70bN/reconnect.sock,server=on:
info: QEMU waiting for connection on:
disconnected:unix:/tmp/vhost-test-aK70bN/reconnect.sock,server=on\nqemu-system-x86_64:
Failed to set msg fds.\nqemu-system-x86_64: vhost VQ 0 ring restore failed:
-22: Invalid argument (22)\nqemu-system-x86_64: Failed to set msg
fds.\nqemu-system-x86_64: vhost VQ 1 ring restore failed: -22: Invalid argument
(22)\n**\nERROR:../tests/qtest/vhost-user-test.c:810:wait_for_rings_started:
assertion failed (ctpop64(s->rings) == count): (1 == 2)\n"
**
ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child process
(/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
[24153]) failed unexpectedly
Bail out! ERROR:../tests/qtest/qos-test.c:189:subprocess_run_one_test: child
process
(/x86_64/pc/i440FX-pcihost/pci-bus-pc/pci-bus/virtio-net-pci/virtio-net/virtio-net-tests/vhost-user/reconnect/subprocess
[24153]) failed unexpectedly
==24147==
==24147== Process terminating with default action of signal 6 (SIGABRT):
dumping core
>
> Here:
>
> # starting vhost-user backend: exec ./storage-daemon/qemu-storage-daemon
> --blockdev driver=file,node-name=disk0,filename=qtest.OkpNv2 --export
> type=vhost-user-blk,id=disk0,addr.type=fd,addr.str=3,node-name=disk0,writable=on,num-queues=1
>
> # starting QEMU: exec ./qemu-system-x86_64 -qtest unix:/tmp/qtest-23786.sock
> -qtest-log /dev/null -chardev socket,path=/tmp/qtest-23786.qmp,id=char0 -mon
> chardev=char0,mode=control -display none -M pc -device
> vhost-user-blk-pci,id=drv0,chardev=char1,addr=4.0 -object
> memory-backend-memfd,id=mem,size=256M,share=on -M memory-backend=mem -m 256M
> -chardev socket,id=char1,path=/tmp/qtest-23786-sock.RAqTFy -accel qtest
> ==23786== Use of uninitialised value of size 8
> ==23786== at 0x5EFEE01: _itoa_word (_itoa.c:180)
> ==23786== by 0x5F02740: vfprintf (vfprintf.c:1642)
> ==23786== by 0x5FBA8FE: __vsprintf_chk (vsprintf_chk.c:83)
> ==23786== by 0x5FBA829: __sprintf_chk (sprintf_chk.c:31)
> ==23786== by 0x140A25: sprintf (stdio2.h:33)
> ==23786== by 0x140A25: qtest_memwrite (libqtest.c:1067)
> ==23786== by 0x13642F: virtio_blk_request (vhost-user-blk-test.c:90)
> ==23786== by 0x13714D: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:123)
> ==23786== by 0x1380CB: test_basic (vhost-user-blk-test.c:357)
> ==23786== by 0x1380CB: basic (vhost-user-blk-test.c:452)
> ==23786== by 0x121837: run_one_test (qos-test.c:182)
> ==23786== by 0x4EBAA65: test_case_run (gtestutils.c:2632)
> ==23786== by 0x4EBAA65: g_test_run_suite_internal (gtestutils.c:2720)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== Uninitialised value was created by a stack allocation
> ==23786== at 0x1370B0: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:102)
> ==23786==
> ==23786== Conditional jump or move depends on uninitialised value(s)
> ==23786== at 0x5EFEE08: _itoa_word (_itoa.c:180)
> ==23786== by 0x5F02740: vfprintf (vfprintf.c:1642)
> ==23786== by 0x5FBA8FE: __vsprintf_chk (vsprintf_chk.c:83)
> ==23786== by 0x5FBA829: __sprintf_chk (sprintf_chk.c:31)
> ==23786== by 0x140A25: sprintf (stdio2.h:33)
> ==23786== by 0x140A25: qtest_memwrite (libqtest.c:1067)
> ==23786== by 0x13642F: virtio_blk_request (vhost-user-blk-test.c:90)
> ==23786== by 0x13714D: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:123)
> ==23786== by 0x1380CB: test_basic (vhost-user-blk-test.c:357)
> ==23786== by 0x1380CB: basic (vhost-user-blk-test.c:452)
> ==23786== by 0x121837: run_one_test (qos-test.c:182)
> ==23786== by 0x4EBAA65: test_case_run (gtestutils.c:2632)
> ==23786== by 0x4EBAA65: g_test_run_suite_internal (gtestutils.c:2720)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== Uninitialised value was created by a stack allocation
> ==23786== at 0x1370B0: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:102)
> ==23786==
> ==23786== Conditional jump or move depends on uninitialised value(s)
> ==23786== at 0x5F027F8: vfprintf (vfprintf.c:1642)
> ==23786== by 0x5FBA8FE: __vsprintf_chk (vsprintf_chk.c:83)
> ==23786== by 0x5FBA829: __sprintf_chk (sprintf_chk.c:31)
> ==23786== by 0x140A25: sprintf (stdio2.h:33)
> ==23786== by 0x140A25: qtest_memwrite (libqtest.c:1067)
> ==23786== by 0x13642F: virtio_blk_request (vhost-user-blk-test.c:90)
> ==23786== by 0x13714D: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:123)
> ==23786== by 0x1380CB: test_basic (vhost-user-blk-test.c:357)
> ==23786== by 0x1380CB: basic (vhost-user-blk-test.c:452)
> ==23786== by 0x121837: run_one_test (qos-test.c:182)
> ==23786== by 0x4EBAA65: test_case_run (gtestutils.c:2632)
> ==23786== by 0x4EBAA65: g_test_run_suite_internal (gtestutils.c:2720)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== Uninitialised value was created by a stack allocation
> ==23786== at 0x1370B0: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:102)
> ==23786==
> ==23786== Conditional jump or move depends on uninitialised value(s)
> ==23786== at 0x5F0324C: vfprintf (vfprintf.c:1642)
> ==23786== by 0x5FBA8FE: __vsprintf_chk (vsprintf_chk.c:83)
> ==23786== by 0x5FBA829: __sprintf_chk (sprintf_chk.c:31)
> ==23786== by 0x140A25: sprintf (stdio2.h:33)
> ==23786== by 0x140A25: qtest_memwrite (libqtest.c:1067)
> ==23786== by 0x13642F: virtio_blk_request (vhost-user-blk-test.c:90)
> ==23786== by 0x13714D: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:123)
> ==23786== by 0x1380CB: test_basic (vhost-user-blk-test.c:357)
> ==23786== by 0x1380CB: basic (vhost-user-blk-test.c:452)
> ==23786== by 0x121837: run_one_test (qos-test.c:182)
> ==23786== by 0x4EBAA65: test_case_run (gtestutils.c:2632)
> ==23786== by 0x4EBAA65: g_test_run_suite_internal (gtestutils.c:2720)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== by 0x4EBA97A: g_test_run_suite_internal (gtestutils.c:2732)
> ==23786== Uninitialised value was created by a stack allocation
> ==23786== at 0x1370B0: test_invalid_discard_write_zeroes
> (vhost-user-blk-test.c:102)
> ==23786==
>
>
> Ciao,
>
> Claudio
>
- make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic, Claudio Fontana, 2022/05/26
- Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic,
Claudio Fontana <=
- Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic, Dario Faggioli, 2022/05/27
- Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic, Claudio Fontana, 2022/05/27
- Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic, Claudio Fontana, 2022/05/27
- Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic, Dario Faggioli, 2022/05/27
- Re: make -j check failing on master, interesting valgrind errors on qos-test vhost-user-blk-test/basic, Alex Bennée, 2022/05/27