Hi Matt, On Sat, Aug 1, 2020 at 12:03 AM Matt Taggart <[email protected]> wrote: > > I am also seeing unattended upgrade consume 100% CPU. Attached is a > image of the cpu usage that started upon upgrade to buster. Each time uu > runs the system has 30-40mins of 100% cpu spinning. > > The system is running the current buster version, 1.11.2. > > I see: > #958883 (this bug) - fixed in 2.4, might be the same issue? > #899366 - fixed in 1.4 > #960966 - still open but strace seems different > > The last things I see in strace -f are: > > ==================== > recvmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base=NULL, > iov_len=0}], msg_iovlen=1, msg_controllen=0, > msg_flags=MSG_CTRUNC|MSG_TRUNC|MSG_CMSG_CLOEXEC}, > MSG_PEEK|MSG_TRUNC|MSG_CMSG_CLOEXEC) = 20 > recvmsg(5, {msg_name={sa_family=AF_NETLINK, nl_pid=0, > nl_groups=00000000}, msg_namelen=128->12, msg_iov=[{iov_base={{len=20, > type=NLMSG_DONE, flags=NLM_F_MULTI, seq=0, pid=31505}, 0}, iov_len=20}], > msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CTRUNC|MSG_CMSG_CLOEXEC}, > MSG_CMSG_CLOEXEC) = 20 > brk(0x79c5000) = 0x79c5000 > brk(0x7a1f000) = 0x7a1f000 > mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, > 0) = 0x7f257770d000 > mremap(0x7f257770d000, 1052672, 2101248, MREMAP_MAYMOVE) = 0x7f257750c000 > mremap(0x7f257750c000, 2101248, 4198400, MREMAP_MAYMOVE) = 0x7f257710b000 > ==================== > > I considered trying 2.5 from testing but it wants to pull in newer apt > and some other things. > Is a backport of 2.5 to buster possible for testing? > Let me know if you want me to try anything. > This seems important enough to fix in a stable update.
There were many performance-related fixes in unattended-upgrades. The most significant ones need newer python-apt, so a potential backport is blocked on a python-apt backport. Also while I'd be happy to provide a backport at the moment I can't commit to maintaining one so it needs a volunteer to do the unattended-upgrades backport. If you are ok with running a patched version yourself there is a fix in flight to disable the CPU intensive parts. Please read the change carefully because it will keep more packages back: https://github.com/mvo5/unattended-upgrades/pull/280 Cheers, Balint > > -- > Matt Taggart > [email protected] > -- Balint Reczey Ubuntu & Debian Developer
