[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Found memory leak in libxenstore
On Mon, Sep 07, 2015 at 11:37:48AM +0100, Wei Liu wrote: > I only had a brief look at this. > > On Mon, Sep 07, 2015 at 09:52:08AM +0000, Sunguodong wrote: > > Hi, > > I found this memory leak on xen-4.5.0: > > linux-byXjTX:~ # virsh version > > Compiled against library: libvirt 1.2.17 > > Using library: libvirt 1.2.17 > > Using API: Xen 1.2.17 > > Running hypervisor: Xen 4.5.0 > > > > Steps to produce this leak: > > > > 1. Start a vm, win7_64_2U_vhd, for example. > > > > 2. Stop libvirtd and start it with valgrind, using the following > > command: > > > > valgrind --tool=memcheck --log-file=xs.log --leak-check=full > > --show-reachable=yes --track-origins=yes --trace-children=yes --verbose > > libvirtd -d -l > > > > 3. Wait until libvirtd started, then reboot the vm: > > > > virsh reboot win7_64_2U_vhd > > > > 4. After vm restarted, kill valgind with signal 3: > > > > kill -3 27483 (27483 is the pid of valgrind) > > > > 5. Open xs.log, search 'definitely', we will always find this leak: > > > > ==28989== 40 bytes in 1 blocks are definitely lost in loss record 327 of 585 > > > > ==28989== at 0x4C27B9B: malloc (vg_replace_malloc.c:263) > > > > ==28989== by 0x7EBD618: read_message (xs.c:1146) > > > > ==28989== by 0x7EBE8C6: read_thread (xs.c:1222) > > > > ==28989== by 0x74F8805: start_thread (in /lib64/libpthread-2.11.3.so) > > > > ==28989== by 0x77EC66C: clone (in /lib64/libc-2.11.3.so) > > > > When we reboot vm twice, this leak would happen twice either. Could anyone > > verify this and fix it? > > Those messages are freed after the connection is closed. Are you sure > they are still there after you close the connection? > Another theory is that libvirt never closes the connection. I do think this is a bit undesirable (that, messages are not freed until connection is closed), but unfortunately I don't have time for this until 4.6 is out. Wei. > Wei. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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