* using log directory ‘/home/hornik/tmp/CRAN_special_clang-san/fastQR.Rcheck’
* using R Under development (unstable) (2026-01-20 r89309)
* using platform: x86_64-pc-linux-gnu
* R was compiled by
    Debian clang version 21.1.8 (1)
    Debian flang version 21.1.8 (1)
* running under: Debian GNU/Linux forky/sid
* using session charset: UTF-8
* checking for file ‘fastQR/DESCRIPTION’ ... OK
* checking extension type ... Package
* this is package ‘fastQR’ version ‘1.1.0’
* package encoding: UTF-8
* checking package namespace information ... OK
* checking package dependencies ... OK
* checking if this is a source package ... OK
* checking if there is a namespace ... OK
* checking for executable files ... OK
* checking for hidden files and directories ... OK
* checking for portable file names ... OK
* checking for sufficient/correct file permissions ... OK
* checking serialization versions ... OK
* checking whether package ‘fastQR’ can be installed ... [232s/232s] OK
* used C++ compiler: ‘Debian clang version 21.1.8 (1+b1)’
* checking package directory ... OK
* checking for future file timestamps ... OK
* checking DESCRIPTION meta-information ... OK
* checking top-level files ... OK
* checking for left-over files ... OK
* checking index information ... OK
* checking package subdirectories ... OK
* checking code files for non-ASCII characters ... OK
* checking R files for syntax errors ... OK
* checking whether the package can be loaded ... [1s/1s] OK
* checking whether the package can be loaded with stated dependencies ... [1s/1s] OK
* checking whether the package can be unloaded cleanly ... [1s/1s] OK
* checking whether the namespace can be loaded with stated dependencies ... [1s/1s] OK
* checking whether the namespace can be unloaded cleanly ... [1s/1s] OK
* checking loading without being on the library search path ... [1s/1s] OK
* checking use of S3 registration ... OK
* checking dependencies in R code ... OK
* checking S3 generic/method consistency ... OK
* checking replacement functions ... OK
* checking foreign function calls ... OK
* checking R code for possible problems ... [9s/9s] OK
* checking Rd files ... [3s/3s] OK
* checking Rd metadata ... OK
* checking Rd line widths ... OK
* checking Rd cross-references ... OK
* checking for missing documentation entries ... OK
* checking for code/documentation mismatches ... OK
* checking Rd \usage sections ... OK
* checking Rd contents ... OK
* checking for unstated dependencies in examples ... OK
* checking line endings in C/C++/Fortran sources/headers ... OK
* checking line endings in Makefiles ... OK
* checking compilation flags in Makevars ... OK
* checking for GNU extensions in Makefiles ... OK
* checking for portable use of $(BLAS_LIBS) and $(LAPACK_LIBS) ... OK
* checking use of PKG_*FLAGS in Makefiles ... OK
* checking use of SHLIB_OPENMP_*FLAGS in Makefiles ... OK
* checking pragmas in C/C++ headers and code ... OK
* checking compilation flags used ... OK
* checking compiled code ... OK
* checking examples ... [2s/2s] ERROR
Running examples in ‘fastQR-Ex.R’ failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: qr_fitted
> ### Title: Compute fitted values from a QR decomposition
> ### Aliases: qr_fitted
> 
> ### ** Examples
> 
> set.seed(1)
> n <- 10; p <- 4
> X <- matrix(rnorm(n * p), n, p)
> y <- rnorm(n)
> 
> qr_res <- fastQR::qr_fast(X)
> yhat1  <- fastQR::qr_fitted(qr = qr_res$qr, tau = qr_res$qraux, y = y)
=================================================================
==1609418==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7be369932648 at pc 0x7be3535724e6 bp 0x7ffd0a3923b0 sp 0x7ffd0a3923a8
READ of size 8 at 0x7be369932648 thread T0
    #0 0x7be3535724e5 in Eigen::DenseStorage<double, -1, -1, -1, 0>::rows() const /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Core/DenseStorage.h:472:69
    #1 0x7be3535724e5 in Eigen::PlainObjectBase<Eigen::Matrix<double, -1, -1, 0, -1, -1>>::rows() const /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Core/PlainObjectBase.h:143:58
    #2 0x7be3535724e5 in Eigen::HouseholderSequence<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, 1, 0, -1, 1>, 1>::rows() const /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Householder/HouseholderSequence.h:205:76
    #3 0x7be3535724e5 in void Eigen::HouseholderSequence<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, 1, 0, -1, 1>, 1>::applyThisOnTheLeft<Eigen::Matrix<double, -1, 1, 0, -1, 1>, Eigen::Matrix<double, 1, 1, 1, 1, 1>>(Eigen::Matrix<double, -1, 1, 0, -1, 1>&, Eigen::Matrix<double, 1, 1, 1, 1, 1>&, bool) const /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Householder/HouseholderSequence.h:408:28
    #4 0x7be3536d40be in void Eigen::HouseholderSequence<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, 1, 0, -1, 1>, 1>::applyThisOnTheLeft<Eigen::Matrix<double, -1, 1, 0, -1, 1>>(Eigen::Matrix<double, -1, 1, 0, -1, 1>&, bool) const /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Householder/HouseholderSequence.h:364:7
    #5 0x7be3536d40be in Eigen::internal::matrix_type_times_scalar_type<double, Eigen::Matrix<double, -1, 1, 0, -1, 1>>::Type Eigen::HouseholderSequence<Eigen::Matrix<double, -1, -1, 0, -1, -1>, Eigen::Matrix<double, -1, 1, 0, -1, 1>, 1>::operator*<Eigen::Matrix<double, -1, 1, 0, -1, 1>>(Eigen::MatrixBase<Eigen::Matrix<double, -1, 1, 0, -1, 1>> const&) const /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Householder/HouseholderSequence.h:427:7
    #6 0x7be3536d40be in qr_fitted_rank(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<double, -1, 1, 0, -1, 1> const&, Eigen::Matrix<double, -1, 1, 0, -1, 1> const&, int) /home/hornik/tmp/CRAN_special_clang-san/fastQR.Rcheck/00_pkg_src/fastQR/src/fastQRutils.cpp:361:34
    #7 0x7be3534f2a0f in qr_fitted(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<double, -1, 1, 0, -1, 1> const&, Eigen::Matrix<double, -1, 1, 0, -1, 1> const&, Rcpp::Nullable<int>) /home/hornik/tmp/CRAN_special_clang-san/fastQR.Rcheck/00_pkg_src/fastQR/src/QR_utils_wrap.cpp:1435:21
    #8 0x7be3536aa0a7 in _fastQR_qr_fitted /home/hornik/tmp/CRAN_special_clang-san/fastQR.Rcheck/00_pkg_src/fastQR/src/RcppExports.cpp:195:34
    #9 0x7fe36eb445cc in R_doDotCall /home/hornik/src/R/src/main/dotcode.c:763:11
    #10 0x7fe36eced782 in bcEval_loop /home/hornik/src/R/src/main/eval.c:8682:21
    #11 0x7fe36ec9ba34 in bcEval /home/hornik/src/R/src/main/eval.c:7515:16
    #12 0x7fe36ec9a16f in Rf_eval /home/hornik/src/R/src/main/eval.c:1167:8
    #13 0x7fe36eca499b in R_execClosure /home/hornik/src/R/src/main/eval.c:2389:22
    #14 0x7fe36eca0293 in applyClosure_core /home/hornik/src/R/src/main/eval.c:2302:16
    #15 0x7fe36ec9aaef in Rf_applyClosure /home/hornik/src/R/src/main/eval.c:2324:16
    #16 0x7fe36ec9aaef in Rf_eval /home/hornik/src/R/src/main/eval.c:1280:12
    #17 0x7fe36ecb33f5 in do_set /home/hornik/src/R/src/main/eval.c:3581:8
    #18 0x7fe36ec9a53b in Rf_eval /home/hornik/src/R/src/main/eval.c:1232:12
    #19 0x7fe36eddf3f5 in Rf_ReplIteration /home/hornik/src/R/src/main/main.c:264:15
    #20 0x7fe36ede2550 in R_ReplConsole /home/hornik/src/R/src/main/main.c:317:11
    #21 0x7fe36ede2364 in run_Rmainloop /home/hornik/src/R/src/main/main.c:1235:5
    #22 0x7fe36ede264a in Rf_mainloop /home/hornik/src/R/src/main/main.c:1242:5
    #23 0x55e3a0d97004 in main /home/hornik/src/R/src/main/Rmain.c:29:5
    #24 0x7fe36de29f74 in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
    #25 0x7fe36de2a026 in __libc_start_main csu/../csu/libc-start.c:360:3
    #26 0x55e3a0cac380 in _start (/home/hornik/tmp/R-d-clang-xtra/bin/exec/R+0x2c380) (BuildId: bc88c46ef9240773c07d57c927010d00876dfe01)

Address 0x7be369932648 is located in stack of thread T0 at offset 584 in frame
    #0 0x7be3536d3b17 in qr_fitted_rank(Eigen::Matrix<double, -1, -1, 0, -1, -1> const&, Eigen::Matrix<double, -1, 1, 0, -1, 1> const&, Eigen::Matrix<double, -1, 1, 0, -1, 1> const&, int) /home/hornik/tmp/CRAN_special_clang-san/fastQR.Rcheck/00_pkg_src/fastQR/src/fastQRutils.cpp:341

  This frame has 19 object(s):
    [32, 40) 'workspace'
    [64, 88) 'srcEvaluator'
    [128, 152) 'dstEvaluator'
    [192, 224) 'kernel'
    [256, 257) 'ref.tmp'
    [272, 280) 'workspace'
    [304, 328) 'srcEvaluator'
    [368, 376) 'dstEvaluator'
    [400, 432) 'kernel'
    [464, 465) 'ref.tmp'
    [480, 481) 'ref.tmp'
    [496, 536) 'Q' (line 359)
    [576, 600) 'ref.tmp' (line 359) <== Memory access at offset 584 is inside this variable
    [640, 696) 'ref.tmp' (line 359)
    [736, 752) 'ref.tmp' (line 359)
    [768, 784) 'Qty' (line 361)
    [800, 840) 'ref.tmp' (line 361)
    [880, 896) 'tmp' (line 362)
    [912, 968) 'ref.tmp' (line 363)
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-use-after-scope /home/hornik/tmp/CRAN_special_clang-san/Library/RcppEigen/include/Eigen/src/Core/DenseStorage.h:472:69 in Eigen::DenseStorage<double, -1, -1, -1, 0>::rows() const
Shadow bytes around the buggy address:
  0x7be369932380: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
  0x7be369932400: f1 f1 f1 f1 f8 f2 f2 f2 f8 f8 f8 f2 f2 f2 f2 f2
  0x7be369932480: f8 f8 f8 f2 f2 f2 f2 f2 f8 f8 f8 f8 f2 f2 f2 f2
  0x7be369932500: f8 f2 00 f2 f2 f2 f8 f8 f8 f2 f2 f2 f2 f2 f8 f2
  0x7be369932580: f2 f2 f8 f8 f8 f8 f2 f2 f2 f2 f8 f2 f8 f2 00 00
=>0x7be369932600: 00 00 00 f2 f2 f2 f2 f2 f8[f8]f8 f2 f2 f2 f2 f2
  0x7be369932680: f8 f8 f8 f8 f8 f8 f8 f2 f2 f2 f2 f2 f8 f8 f2 f2
  0x7be369932700: 00 00 f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2 f8 f8
  0x7be369932780: f2 f2 f8 f8 f8 f8 f8 f8 f8 f3 f3 f3 f3 f3 f3 f3
  0x7be369932800: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
  0x7be369932880: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==1609418==ABORTING
* checking PDF version of manual ... [4s/4s] OK
* checking HTML version of manual ... [7s/7s] OK
* checking for non-standard things in the check directory ... OK
* checking for detritus in the temp directory ... OK
* DONE
Status: 1 ERROR