GNU bug report logs - #34238
Assertion `num >= 0' failed at regexec.c:1363

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Package: grep; Reported by: Hongxu Chen <leftcopy.chx@HIDDEN>; merged with #22793, #32806; dated Tue, 29 Jan 2019 02:58:02 UTC; Maintainer for grep is bug-grep@HIDDEN.
Merged 22793 32806 34238. Request was from Paul Eggert <eggert@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 34238 <at> debbugs.gnu.org:


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Subject: Re: bug#34238: Assertion `num >= 0' failed at regexec.c:1363
To: Hongxu Chen <leftcopy.chx@HIDDEN>
References: <CAJPBKOHY9UkQcR_BWhmFTzLAVdAhML1BY4vD_2nYd0p_+6jLPQ@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
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Thanks for the test case. This appears to be the same as bug#22793 so
I'll merge them.

https://debbugs.gnu.org/22793




Information forwarded to bug-grep@HIDDEN:
bug#34238; Package grep. Full text available.

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Date: Tue, 29 Jan 2019 10:57:18 +0800
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Subject: Assertion `num >= 0' failed at regexec.c:1363
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Hi,

    GNU grep 3.3.7-8df7 (and other versions such as 3.1) may trigger an
assertion failure by executing the following command.

    echo | grep -f regex.grep

Reading symbols from ./grep...done.
gdb$ run
Starting program: /home/hongxu/FOT/grep-asan/install/bin/grep -q -f
assert_regexec.c:1363.grep assert_regexec.c:1363.input
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
grep: ./regexec.c:1363: Idx pop_fail_stack(struct re_fail_stack_t *, Idx *,
Idx, regmatch_t *, re_node_set *): Assertion `num >= 0' failed.

Program received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51
51      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
gdb$ bt
#0  __GI_raise (sig=sig@entry=0x6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007ffff6bd1801 in __GI_abort () at abort.c:79
#2  0x00007ffff6bc139a in __assert_fail_base (fmt=0x7ffff6d487d8
"%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x5f8d20
<.str.26> "num >= 0", file=file@entry=0x5f8a60 <.str.22> "./regexec.c",
line=line@entry=0x553, function=function@entry=0x5f8d60
<__PRETTY_FUNCTION__.pop_fail_stack> "Idx pop_fail_stack(struct
re_fail_stack_t *, Idx *, Idx, regmatch_t *, re_node_set *)") at assert.c:92
#3  0x00007ffff6bc1412 in __GI___assert_fail (assertion=0x5f8d20 <.str.26>
"num >= 0", file=0x5f8a60 <.str.22> "./regexec.c", line=0x553,
function=0x5f8d60 <__PRETTY_FUNCTION__.pop_fail_stack> "Idx
pop_fail_stack(struct re_fail_stack_t *, Idx *, Idx, regmatch_t *,
re_node_set *)") at assert.c:101
#4  0x00000000005d08f3 in pop_fail_stack (fs=0x7fffffffa3c0,
pidx=0x7fffffffa360, nregs=0x4, regs=0x606000000740,
eps_via_nodes=0x7fffffffa380) at ./regexec.c:1363
#5  0x00000000005b691b in set_regs (preg=0x60c000000380,
mctx=0x7fffffffa6a0, nmatch=0x4, pmatch=0x606000000740, fl_backtrack=0x1)
at ./regexec.c:1467
#6  0x0000000000588820 in re_search_internal (preg=0x60c000000380,
string=0x7fffffffb8d1 "\n", length=0x0, start=0x0, last_start=0x0,
stop=0x0, nmatch=0x4, pmatch=0x606000000740, eflags=0x0) at ./regexec.c:864
#7  0x0000000000589aa8 in re_search_stub (bufp=0x60c000000380,
string=0x7fffffffb8d1 "\n", length=0x0, start=0x0, range=0x0, stop=0x0,
regs=0x607000000430, ret_len=0x0) at ./regexec.c:425
#8  0x0000000000589e32 in rpl_re_search (bufp=0x60c000000380,
string=0x7fffffffb8d1 "\n", length=0x0, start=0x0, range=0x0,
regs=0x607000000430) at ./regexec.c:289
#9  0x00000000005160fe in EGexecute (vdc=0x607000000410, buf=0x7fffffffb8d1
"\n", size=0x1, match_size=0x7fffffffb8e0, start_ptr=0x0) at dfasearch.c:357
#10 0x000000000051abec in main (argc=0x5, argv=0x7fffffffbee8) at
grep.c:2894


    regex.grep is attached.

Best Regards,
Hongxu

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div>Hi,</div><div><br></div><div>=C2=A0=C2=A0=
=C2=A0 GNU grep 3.3.7-8df7 (and other versions such as 3.1) may trigger an =
assertion failure by executing the following command.</div><div><br></div><=
div>=C2=A0=C2=A0=C2=A0 echo | grep -f regex.grep</div><div><br></div><div>R=
eading symbols from ./grep...done.<br>gdb$ run<br>Starting program: /home/h=
ongxu/FOT/grep-asan/install/bin/grep -q -f assert_regexec.c:1363.grep asser=
t_regexec.c:1363.input<br>[Thread debugging using libthread_db enabled]<br>=
Using host libthread_db library &quot;/lib/x86_64-linux-gnu/libthread_db.so=
.1&quot;.<br>grep: ./regexec.c:1363: Idx pop_fail_stack(struct re_fail_stac=
k_t *, Idx *, Idx, regmatch_t *, re_node_set *): Assertion `num &gt;=3D 0&#=
39; failed.<br><br>Program received signal SIGABRT, Aborted.<br>__GI_raise =
(sig=3Dsig@entry=3D0x6) at ../sysdeps/unix/sysv/linux/raise.c:51<br>51=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 ../sysdeps/unix/sysv/linux/raise.c: No such fil=
e or directory.<br>gdb$ bt<br>#0=C2=A0 __GI_raise (sig=3Dsig@entry=3D0x6) a=
t ../sysdeps/unix/sysv/linux/raise.c:51<br>#1=C2=A0 0x00007ffff6bd1801 in _=
_GI_abort () at abort.c:79<br>#2=C2=A0 0x00007ffff6bc139a in __assert_fail_=
base (fmt=3D0x7ffff6d487d8 &quot;%s%s%s:%u: %s%sAssertion `%s&#39; failed.\=
n%n&quot;, assertion=3Dassertion@entry=3D0x5f8d20 &lt;.str.26&gt; &quot;num=
 &gt;=3D 0&quot;, file=3Dfile@entry=3D0x5f8a60 &lt;.str.22&gt; &quot;./rege=
xec.c&quot;, line=3Dline@entry=3D0x553, function=3Dfunction@entry=3D0x5f8d6=
0 &lt;__PRETTY_FUNCTION__.pop_fail_stack&gt; &quot;Idx pop_fail_stack(struc=
t re_fail_stack_t *, Idx *, Idx, regmatch_t *, re_node_set *)&quot;) at ass=
ert.c:92<br>#3=C2=A0 0x00007ffff6bc1412 in __GI___assert_fail (assertion=3D=
0x5f8d20 &lt;.str.26&gt; &quot;num &gt;=3D 0&quot;, file=3D0x5f8a60 &lt;.st=
r.22&gt; &quot;./regexec.c&quot;, line=3D0x553, function=3D0x5f8d60 &lt;__P=
RETTY_FUNCTION__.pop_fail_stack&gt; &quot;Idx pop_fail_stack(struct re_fail=
_stack_t *, Idx *, Idx, regmatch_t *, re_node_set *)&quot;) at assert.c:101=
<br>#4=C2=A0 0x00000000005d08f3 in pop_fail_stack (fs=3D0x7fffffffa3c0, pid=
x=3D0x7fffffffa360, nregs=3D0x4, regs=3D0x606000000740, eps_via_nodes=3D0x7=
fffffffa380) at ./regexec.c:1363<br>#5=C2=A0 0x00000000005b691b in set_regs=
 (preg=3D0x60c000000380, mctx=3D0x7fffffffa6a0, nmatch=3D0x4, pmatch=3D0x60=
6000000740, fl_backtrack=3D0x1) at ./regexec.c:1467<br>#6=C2=A0 0x000000000=
0588820 in re_search_internal (preg=3D0x60c000000380, string=3D0x7fffffffb8=
d1 &quot;\n&quot;, length=3D0x0, start=3D0x0, last_start=3D0x0, stop=3D0x0,=
 nmatch=3D0x4, pmatch=3D0x606000000740, eflags=3D0x0) at ./regexec.c:864<br=
>#7=C2=A0 0x0000000000589aa8 in re_search_stub (bufp=3D0x60c000000380, stri=
ng=3D0x7fffffffb8d1 &quot;\n&quot;, length=3D0x0, start=3D0x0, range=3D0x0,=
 stop=3D0x0, regs=3D0x607000000430, ret_len=3D0x0) at ./regexec.c:425<br>#8=
=C2=A0 0x0000000000589e32 in rpl_re_search (bufp=3D0x60c000000380, string=
=3D0x7fffffffb8d1 &quot;\n&quot;, length=3D0x0, start=3D0x0, range=3D0x0, r=
egs=3D0x607000000430) at ./regexec.c:289<br>#9=C2=A0 0x00000000005160fe in =
EGexecute (vdc=3D0x607000000410, buf=3D0x7fffffffb8d1 &quot;\n&quot;, size=
=3D0x1, match_size=3D0x7fffffffb8e0, start_ptr=3D0x0) at dfasearch.c:357<br=
>#10 0x000000000051abec in main (argc=3D0x5, argv=3D0x7fffffffbee8) at grep=
.c:2894<br><br></div><div><br></div><div>=C2=A0=C2=A0=C2=A0 regex.grep is a=
ttached.<br></div><div><br></div><div><div dir=3D"ltr" class=3D"gmail_signa=
ture"><div dir=3D"ltr"><div><div dir=3D"ltr"><font face=3D"Arial, sans-seri=
f" color=3D"#313131"><span style=3D"font-size:12px">Best Regards,</span></f=
ont><div><font face=3D"Arial, sans-serif" color=3D"#313131"><span style=3D"=
font-size:12px">Hongxu</span></font></div></div></div></div></div></div></d=
iv></div></div></div></div></div>

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Acknowledgement sent to Hongxu Chen <leftcopy.chx@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-grep@HIDDEN. Full text available.
Report forwarded to bug-grep@HIDDEN:
bug#34238; Package grep. Full text available.
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Last modified: Thu, 31 Jan 2019 03:30:03 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.