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[bug-gawk] gawk master: test/printf0.awk:3: fatal error: internal error:


From: Hermann Peifer
Subject: [bug-gawk] gawk master: test/printf0.awk:3: fatal error: internal error: segfault
Date: Mon, 29 Feb 2016 18:31:40 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

Hi,

I came across the below segfault by coincidence. I occurs when
pretty-printing with gawk/master, both under Linux and Mac OS X.

Hermann

# Using gawk 4.1.3 on MacOS X
$ /opt/local/bin/gawk -f test/printf0.awk
gawk: test/printf0.awk:3: fatal: printf: no arguments
$ /opt/local/bin/gawk -o -f test/printf0.awk
gawk: test/printf0.awk:3: fatal: printf: no arguments

# Using gawk/master on MacOS X
$ gawk -f test/printf0.awk
gawk: test/printf0.awk:3: fatal: printf: no arguments
$ gawk -o -f test/printf0.awk
gawk: test/printf0.awk:3: fatal error: internal error: segfault
Abort trap: 6

The crash report mentions:
Thread 0:: Dispatch queue: com.apple.main-thread
0   gawk           0x00000001047fbd43 pp_list + 675
1   gawk           0x00000001047f86dc pprint + 6988
2   gawk           0x00000001047f6e42 pprint + 690
3   gawk           0x00000001047f6b80 dump_prog + 240
4   gawk           0x00000001047ee1fe main + 6302
5   libdyld.dylib  0x00007fff91df65ad start + 1



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