Pressing either Ctrl-\ of Ctrl-4 core dumps R
Control-backslash is the default way to generate SIGQUIT from the keyboard on Unix and SIGQUIT, by default, aborts the process and causes it to produce a core dump. Do you want R to catch SIGQUIT? % stty --all speed 38400 baud; rows 24; columns 64; line = 0; intr = ^C; quit = ^\; erase = ^H; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0; -parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal -crtscts -ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc -ixany -imaxbel -iutf8 opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0 isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke Bill Dunlap TIBCO Software wdunlap tibco.com On Fri, Feb 10, 2017 at 10:40 AM, Henrik Bengtsson
<henrik.bengtsson at gmail.com> wrote:
When running R from the terminal on Linux (Ubuntu 16.04), it core dumps whenever / wherever I press Ctrl-4 or Ctrl-\. You get thrown back to the terminal with "Quit (core dump)" being the only message. Grepping the R source code, it doesn't look like that message is generated by R itself. Over on Twitter, it has been confirmed to also happen on macOS. $ R -d valgrind --vanilla --quiet ==979== Memcheck, a memory error detector ==979== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. ==979== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info ==979== Command: /usr/lib/R/bin/exec/R --vanilla --quiet ==979==
1+2
[1] 3 # At next prompt I press Ctrl-\. The same happens also when done in the middle of an entry.
==979==
==979== Process terminating with default action of signal 3 (SIGQUIT) ==979== at 0x576C9C3: __select_nocancel (syscall-template.S:84) ==979== by 0x502EABE: R_SelectEx (in /usr/lib/R/lib/libR.so) ==979== by 0x502EDDF: R_checkActivityEx (in /usr/lib/R/lib/libR.so) ==979== by 0x502F32B: ??? (in /usr/lib/R/lib/libR.so) ==979== by 0x4F6988B: Rf_ReplIteration (in /usr/lib/R/lib/libR.so) ==979== by 0x4F69CF0: ??? (in /usr/lib/R/lib/libR.so) ==979== by 0x4F69DA7: run_Rmainloop (in /usr/lib/R/lib/libR.so) ==979== by 0x4007CA: main (in /usr/lib/R/bin/exec/R) ==979== ==979== HEAP SUMMARY: ==979== in use at exit: 28,981,596 bytes in 13,313 blocks ==979== total heap usage: 27,002 allocs, 13,689 frees, 49,025,684 bytes allocated ==979== ==979== LEAK SUMMARY: ==979== definitely lost: 0 bytes in 0 blocks ==979== indirectly lost: 0 bytes in 0 blocks ==979== possibly lost: 0 bytes in 0 blocks ==979== still reachable: 28,981,596 bytes in 13,313 blocks ==979== suppressed: 0 bytes in 0 blocks ==979== Rerun with --leak-check=full to see details of leaked memory ==979== ==979== For counts of detected and suppressed errors, rerun with: -v ==979== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0) Quit (core dumped) $ R --version R version 3.3.2 (2016-10-31) -- "Sincere Pumpkin Patch" Copyright (C) 2016 The R Foundation for Statistical Computing Platform: x86_64-pc-linux-gnu (64-bit) /Henrik
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