Hi,
I'm working on vhost-user block device backend [1]. When I tested my
patches on the latest version of QEMU (commit
d0ed6a69d399ae193959225cdeaa9382746c91cc) with --enable-sanitizer turned
on, the follow error will be thrown out,
==46631==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 312 byte(s) in 1 object(s) allocated from:
#0 0x55d0a7813921 in calloc (qemu/qemu-storage-daemon+0x646921)
#1 0x7f8bd6f7b591 in g_malloc0 (/usr/lib/libglib-2.0.so.0+0x4f591)
#2 0x55d0a815f3fb in qemu_coroutine_create
qemu/util/qemu-coroutine.c:75:14
#3 0x55d0a817321e in vu_client_start
qemu/util/vhost-user-server.c:225:23
#4 0x55d0a816fcf3 in vu_accept qemu/util/vhost-user-server.c:341:5
#5 0x55d0a7f1293f in qio_net_listener_channel_func
qemu/io/net-listener.c:54:9
#6 0x55d0a7efb0f3 in qio_channel_fd_source_dispatch
qemu/io/channel-watch.c:84:12
#7 0x7f8bd6f7e33f in g_main_context_dispatch
(/usr/lib/libglib-2.0.so.0+0x5233f)
I have to call qemu_coroutine_delete to eliminate this kind of errors.
I noticed
make docker-test-clang@ubuntu SHOW_ENV=1 J=12 TARGET_LIST=x86_64-softmmu
EXTRA_CONFIGURE_OPTS=--enable-sanitizers"
won't give the above error while
"make docker-test-debug@fedora TARGET_LIST=x86_64-softmmu J=12" would.
And for older commits like commit eea8f5df4ecc607d64f091b8d916fcc11a697541,
this kind of error won't be shown either.
Is this kind of error true a false positve because "ASan doesn't fully
support makecontext/swapcontext functions and may produce false positives in some
cases"?
I don't have sufficient knowledge on QEMU coroutine and ASan to reach a
conclusion. Could anyone enlighten me? Thank you!
[1] https://patchew.org/QEMU/20200614183907.514282-1-coiby...@gmail.com/
--
Best regards,
Coiby
