R Under development (unstable) (2026-02-09 r89390) -- "Unsuffered Consequences"
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Platform: x86_64-pc-linux-gnu

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> 
> spdl::setup("demoForTest", "warn")      # new logger
> spdl::set_pattern("[%n] [%l] %v"); 	# special pattern _without time or pid_ for Rout.save use
> 
> spdl::trace("This will not be seen.")
> spdl::debug("Neither will this.")
> spdl::info("Nor this.")
> spdl::warn("But we will see this message")
[demoForTest] [warning] But we will see this message
> spdl::warn("Format {} and {} and {}", 42L, 1.23, TRUE)
=================================================================
==3057013==ERROR: AddressSanitizer: stack-use-after-return on address 0x7b9d166db570 at pc 0x7b9d0825de0e bp 0x7ffdc9bad410 sp 0x7ffdc9bad408
READ of size 16 at 0x7b9d166db570 thread T0
    #0 0x7b9d0825de0d in std::basic_format_args<std::basic_format_context<std::__format::_Sink_iter<char>, char> >::get(unsigned long) const /usr/include/c++/15/format:4208
    #1 0x7b9d0825de0d in std::basic_format_context<std::__format::_Sink_iter<char>, char>::arg(unsigned long) const /usr/include/c++/15/format:4412
    #2 0x7b9d0825de0d in std::__format::_Formatting_scanner<std::__format::_Sink_iter<char>, char>::_M_format_arg(unsigned long) /usr/include/c++/15/format:4582
    #3 0x7b9d0825de0d in std::__format::_Scanner<char>::_M_on_replacement_field() /usr/include/c++/15/format:4545
    #4 0x7b9d0825de0d in std::__format::_Scanner<char>::_M_scan() [clone .constprop.0] /usr/include/c++/15/format:4493
    #5 0x7b9d0826a64d in std::__format::_Sink_iter<char> std::__format::__do_vformat_to<std::__format::_Sink_iter<char>, char, std::basic_format_context<std::__format::_Sink_iter<char>, char> >(std::__format::_Sink_iter<char>, std::basic_string_view<char, std::char_traits<char> >, std::basic_format_args<std::basic_format_context<std::__format::_Sink_iter<char>, char> > const&, std::locale const*) /usr/include/c++/15/format:4750
    #6 0x7b9d0826a64d in std::__format::_Sink_iter<char> std::vformat_to<std::__format::_Sink_iter<char> >(std::__format::_Sink_iter<char>, std::basic_string_view<char, std::char_traits<char> >, std::basic_format_args<std::basic_format_context<std::__format::_Sink_iter<char>, char> >) requires output_iterator<std::__format::_Sink_iter<char>, char const&> /usr/include/c++/15/format:4808
    #7 0x7b9d0826a64d in std::vformat[abi:cxx11](std::basic_string_view<char, std::char_traits<char> >, std::basic_format_args<std::basic_format_context<std::__format::_Sink_iter<char>, char> >) /usr/include/c++/15/format:4843
    #8 0x7b9d0837dc41 in formatter(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >) /tmp/Rtmpwj1ZMe/R.INSTALL2177d87de9812c/RcppSpdlog/src/formatter.cpp:61
    #9 0x7b9d08237d6e in _RcppSpdlog_formatter_try /tmp/Rtmpwj1ZMe/R.INSTALL2177d87de9812c/RcppSpdlog/src/RcppExports.cpp:43
    #10 0x7b9d082395ee in _RcppSpdlog_formatter /tmp/Rtmpwj1ZMe/R.INSTALL2177d87de9812c/RcppSpdlog/src/RcppExports.cpp:51
    #11 0x0000007506f6 in R_doDotCall /data/gannet/ripley/R/svn/R-devel/src/main/dotcode.c:757
    #12 0x0000008e661a in bcEval_loop /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:8682
    #13 0x0000008bce5b in bcEval /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:7515
    #14 0x00000085d782 in Rf_eval /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:1167
    #15 0x0000008734ca in R_execClosure /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:2389
    #16 0x0000008774ba in applyClosure_core /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:2302
    #17 0x00000085de23 in Rf_applyClosure /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:2324
    #18 0x00000085de23 in Rf_eval /data/gannet/ripley/R/svn/R-devel/src/main/eval.c:1280
    #19 0x000000a028c8 in Rf_ReplIteration /data/gannet/ripley/R/svn/R-devel/src/main/main.c:264
    #20 0x000000a028c8 in R_ReplConsole /data/gannet/ripley/R/svn/R-devel/src/main/main.c:317
    #21 0x000000a10c2a in run_Rmainloop /data/gannet/ripley/R/svn/R-devel/src/main/main.c:1235
    #22 0x000000a10cc2 in Rf_mainloop /data/gannet/ripley/R/svn/R-devel/src/main/main.c:1242
    #23 0x00000041317f in main /data/gannet/ripley/R/svn/R-devel/src/main/Rmain.c:29
    #24 0x7f9d1ae115f4 in __libc_start_call_main (/lib64/libc.so.6+0x35f4) (BuildId: a1dda014206b55b07f58fe8db80121b752dc3d03)
    #25 0x7f9d1ae116a7 in __libc_start_main@@GLIBC_2.34 (/lib64/libc.so.6+0x36a7) (BuildId: a1dda014206b55b07f58fe8db80121b752dc3d03)
    #26 0x000000413b64 in _start (/data/gannet/ripley/R/gcc-SAN3/bin/exec/R+0x413b64) (BuildId: d52b7a5ce0938f39f89bfcbb47d80c191861a308)

Address 0x7b9d166db570 is located in stack of thread T0 at offset 368 in frame
    #0 0x7b9d083712bf in std::basic_format_args<std::basic_format_context<std::__format::_Sink_iter<char>, char> > unpack_vector<0ul, 1ul, 2ul>(std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&, std::integer_sequence<unsigned long, 0ul, 1ul, 2ul>) /tmp/Rtmpwj1ZMe/R.INSTALL2177d87de9812c/RcppSpdlog/src/formatter.cpp:11

  This frame has 8 object(s):
    [48, 56) '__diffmax'
    [80, 88) '__allocmax'
    [112, 128) '<unknown>'
    [144, 160) '<unknown>'
    [176, 208) '__arg'
    [240, 272) '__arg'
    [304, 336) '__arg'
    [368, 416) '<unknown>' <== Memory access at offset 368 is inside this variable
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-return /tmp/Rtmpwj1ZMe/R.INSTALL2177d87de9812c/RcppSpdlog/src/formatter.cpp:61 in formatter(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >)
Shadow bytes around the buggy address:
  0x7b9d166db280: 00 00 f2 f2 00 00 f2 f2 00 00 00 00 f2 f2 f2 f2
  0x7b9d166db300: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 f2 f2 f2 f2
  0x7b9d166db380: 00 00 00 00 f2 f2 f2 f2 00 00 00 00 f3 f3 f3 f3
  0x7b9d166db400: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
  0x7b9d166db480: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
=>0x7b9d166db500: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5[f5]f5
  0x7b9d166db580: f5 f5 f5 f5 f5 f5 f5 f5 00 00 00 00 00 00 00 00
  0x7b9d166db600: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
  0x7b9d166db680: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
  0x7b9d166db700: f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5 f5
  0x7b9d166db780: f5 f5 f5 f5 f5 f5 f5 f5 00 00 00 00 00 00 00 00
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
==3057013==ABORTING