On Mon, Jun 15, 2020 at 9:17 AM 'Eric Dumazet' via Clang Built Linux <clang-built-li...@googlegroups.com> wrote: > > On Sun, Jun 14, 2020 at 11:26 PM kernel test robot <l...@intel.com> wrote: > > > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > master > > head: 96144c58abe7ff767e754b5b80995f7b8846d49b > > commit: 39d010504e6b4485d7ceee167743620dd33f4417 net_sched: sch_fq: add > > horizon attribute > > date: 6 weeks ago > > :::::: branch date: 3 hours ago > > :::::: commit date: 6 weeks ago > > config: arm-randconfig-r006-20200614 (attached as .config) > > compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project > > c669a1ed6386d57a75a602b53266466dae1e1d84) > > reproduce (this is a W=1 build): > > wget > > https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O > > ~/bin/make.cross > > chmod +x ~/bin/make.cross > > # install arm cross compiling tool for clang build > > # apt-get install binutils-arm-linux-gnueabi > > git checkout 39d010504e6b4485d7ceee167743620dd33f4417 > > # save the attached .config to linux build tree > > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm > > > > If you fix the issue, kindly add following tag as appropriate > > Reported-by: kernel test robot <l...@intel.com> > > > > All warnings (new ones prefixed by >>, old ones prefixed by <<): > > > > >> net/sched/sch_fq.c:966:12: warning: stack frame size of 1400 bytes in > > >> function 'fq_dump' [-Wframe-larger-than=] > > static int fq_dump(struct Qdisc *sch, struct sk_buff *skb) > > ^ > > > This looks like a bug in CLANG on ARM, there is no way fq_dump() could > consume so much stack space.
You can use https://github.com/ClangBuiltLinux/frame-larger-than to help debug these. You might be surprised who's doing larger stack allocations than expected. > > > > > 1 warning generated. > > > > # > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39d010504e6b4485d7ceee167743620dd33f4417 > > git remote add linus > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > > git remote update linus > > git checkout 39d010504e6b4485d7ceee167743620dd33f4417 > > vim +/fq_dump +966 net/sched/sch_fq.c > > > > afe4fd062416b1 Eric Dumazet 2013-08-29 965 > > afe4fd062416b1 Eric Dumazet 2013-08-29 @966 static int fq_dump(struct > > Qdisc *sch, struct sk_buff *skb) > > afe4fd062416b1 Eric Dumazet 2013-08-29 967 { > > afe4fd062416b1 Eric Dumazet 2013-08-29 968 struct > > fq_sched_data *q = qdisc_priv(sch); > > 48872c11b77271 Eric Dumazet 2018-11-11 969 u64 ce_threshold = > > q->ce_threshold; > > 39d010504e6b44 Eric Dumazet 2020-05-01 970 u64 horizon = > > q->horizon; > > afe4fd062416b1 Eric Dumazet 2013-08-29 971 struct nlattr *opts; > > afe4fd062416b1 Eric Dumazet 2013-08-29 972 > > ae0be8de9a53cd Michal Kubecek 2019-04-26 973 opts = > > nla_nest_start_noflag(skb, TCA_OPTIONS); > > afe4fd062416b1 Eric Dumazet 2013-08-29 974 if (opts == NULL) > > afe4fd062416b1 Eric Dumazet 2013-08-29 975 goto > > nla_put_failure; > > afe4fd062416b1 Eric Dumazet 2013-08-29 976 > > 65c5189a2b57b9 Eric Dumazet 2013-11-15 977 /* > > TCA_FQ_FLOW_DEFAULT_RATE is not used anymore */ > > 65c5189a2b57b9 Eric Dumazet 2013-11-15 978 > > 48872c11b77271 Eric Dumazet 2018-11-11 979 > > do_div(ce_threshold, NSEC_PER_USEC); > > 39d010504e6b44 Eric Dumazet 2020-05-01 980 do_div(horizon, > > NSEC_PER_USEC); > > 48872c11b77271 Eric Dumazet 2018-11-11 981 > > afe4fd062416b1 Eric Dumazet 2013-08-29 982 if > > (nla_put_u32(skb, TCA_FQ_PLIMIT, sch->limit) || > > afe4fd062416b1 Eric Dumazet 2013-08-29 983 > > nla_put_u32(skb, TCA_FQ_FLOW_PLIMIT, q->flow_plimit) || > > afe4fd062416b1 Eric Dumazet 2013-08-29 984 > > nla_put_u32(skb, TCA_FQ_QUANTUM, q->quantum) || > > afe4fd062416b1 Eric Dumazet 2013-08-29 985 > > nla_put_u32(skb, TCA_FQ_INITIAL_QUANTUM, q->initial_quantum) || > > afe4fd062416b1 Eric Dumazet 2013-08-29 986 > > nla_put_u32(skb, TCA_FQ_RATE_ENABLE, q->rate_enable) || > > 76a9ebe811fb3d Eric Dumazet 2018-10-15 987 > > nla_put_u32(skb, TCA_FQ_FLOW_MAX_RATE, > > 76a9ebe811fb3d Eric Dumazet 2018-10-15 988 > > min_t(unsigned long, q->flow_max_rate, ~0U)) || > > f52ed89971adbe Eric Dumazet 2013-11-15 989 > > nla_put_u32(skb, TCA_FQ_FLOW_REFILL_DELAY, > > f52ed89971adbe Eric Dumazet 2013-11-15 990 > > jiffies_to_usecs(q->flow_refill_delay)) || > > 06eb395fa9856b Eric Dumazet 2015-02-04 991 > > nla_put_u32(skb, TCA_FQ_ORPHAN_MASK, q->orphan_mask) || > > 77879147a3481b Eric Dumazet 2016-09-19 992 > > nla_put_u32(skb, TCA_FQ_LOW_RATE_THRESHOLD, > > 77879147a3481b Eric Dumazet 2016-09-19 993 > > q->low_rate_threshold) || > > 48872c11b77271 Eric Dumazet 2018-11-11 994 > > nla_put_u32(skb, TCA_FQ_CE_THRESHOLD, (u32)ce_threshold) || > > 583396f4ca4d6e Eric Dumazet 2020-03-16 995 > > nla_put_u32(skb, TCA_FQ_BUCKETS_LOG, q->fq_trees_log) || > > 39d010504e6b44 Eric Dumazet 2020-05-01 996 > > nla_put_u32(skb, TCA_FQ_TIMER_SLACK, q->timer_slack) || > > 39d010504e6b44 Eric Dumazet 2020-05-01 997 > > nla_put_u32(skb, TCA_FQ_HORIZON, (u32)horizon) || > > 39d010504e6b44 Eric Dumazet 2020-05-01 998 nla_put_u8(skb, > > TCA_FQ_HORIZON_DROP, q->horizon_drop)) > > afe4fd062416b1 Eric Dumazet 2013-08-29 999 goto > > nla_put_failure; > > afe4fd062416b1 Eric Dumazet 2013-08-29 1000 > > d59b7d8059ddc4 Yang Yingliang 2014-03-12 1001 return > > nla_nest_end(skb, opts); > > afe4fd062416b1 Eric Dumazet 2013-08-29 1002 > > afe4fd062416b1 Eric Dumazet 2013-08-29 1003 nla_put_failure: > > afe4fd062416b1 Eric Dumazet 2013-08-29 1004 return -1; > > afe4fd062416b1 Eric Dumazet 2013-08-29 1005 } > > afe4fd062416b1 Eric Dumazet 2013-08-29 1006 > > > > :::::: The code at line 966 was first introduced by commit > > :::::: afe4fd062416b158a8a8538b23adc1930a9b88dc pkt_sched: fq: Fair Queue > > packet scheduler > > > > :::::: TO: Eric Dumazet <eduma...@google.com> > > :::::: CC: David S. Miller <da...@davemloft.net> > > > > --- > > 0-DAY CI Kernel Test Service, Intel Corporation > > https://lists.01.org/hyperkitty/list/kbuild-...@lists.01.org > > _______________________________________________ > > kbuild mailing list -- kbu...@lists.01.org > > To unsubscribe send an email to kbuild-le...@lists.01.org > > -- > You received this message because you are subscribed to the Google Groups > "Clang Built Linux" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clang-built-linux+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/clang-built-linux/CANn89i%2Bs%3DoFTq6KFhT0z1CReQPZCGoEPShEFHVvXAmC9sUDH7g%40mail.gmail.com. -- Thanks, ~Nick Desaulniers
