https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81829
Bug ID: 81829
Summary: [7 Regression] /usr/bin/gcc-{ar,nm,ranlib} segfault
without arguments
Product: gcc
Version: 7.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: doko at gcc dot gnu.org
Target Milestone: ---
[forwarded from http://bugs.debian.org/853537]
[7 Regression] /usr/bin/gcc-{ar,nm,ranlib} segfault without arguments when call
with an absolute name:
$ gdb --args /usr/bin/gcc-ar
Program received signal SIGSEGV, Segmentation fault.
__strcpy_sse2_unaligned () at
../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S:296
296 ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S: No such file or
directory.
(gdb) bt
#0 __strcpy_sse2_unaligned () at
../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S:296
#1 0x0000000000401a17 in find_a_file (pprefix=0x6061d0 <path>, name=0x4044e6
"ar", mode=1)
at ../../src/gcc/file-find.c:81
#2 0x00000000004016ee in main (ac=1, av=0x7fffffffe598) at
../../src/gcc/gcc-ar.c:205
(gdb) up
#1 0x0000000000401a17 in find_a_file (pprefix=0x6061d0 <path>, name=0x4044e6
"ar", mode=1)
at ../../src/gcc/file-find.c:81
81 strcpy (temp, pl->prefix);
(gdb)
pl->prefix is NULL, set by remove_prefix
remove_prefix at the start has:
Breakpoint 1, remove_prefix (prefix=0x6070d0 "/usr/bin/", pprefix=0x6061d0
<path>)
at ../../src/gcc/file-find.c:215
215 struct prefix_list *remove, **prev, **remove_prev = NULL;
(gdb) p *pprefix
$1 = {plist = 0x6070b0, max_len = 22, name = 0x0}
(gdb) p *pprefix->plist
$2 = {prefix = 0x607100 "/home/doko/bin/", next = 0x607120}
(gdb) p *pprefix->plist->next
$3 = {prefix = 0x607140 "/home/doko/.local/bin/", next = 0x607340}
(gdb) p *pprefix->plist->next->next
$4 = {prefix = 0x607360 "/usr/local/bin/", next = 0x607380}
(gdb) p *pprefix->plist->next->next->next
$5 = {prefix = 0x6073a0 "/usr/bin/", next = 0x6073c0}
(gdb) p *pprefix->plist->next->next->next->next
$6 = {prefix = 0x6073e0 "/bin/", next = 0x607400}
(gdb) p *pprefix->plist->next->next->next->next->next
$7 = {prefix = 0x607420 "/usr/local/games/", next = 0x607440}
(gdb) p *pprefix->plist->next->next->next->next->next->next
$8 = {prefix = 0x607460 "/usr/games/", next = 0x0}
and then at the end:
(gdb) p *remove_prev
$1 = (prefix_list *) 0x6073c0
(gdb) p **remove_prev
$2 = {prefix = 0x6073e0 "/bin/", next = 0x607400}
(gdb) p *pprefix->plist
$3 = {prefix = 0x607100 "/home/doko/bin/", next = 0x607120}
(gdb) p *pprefix->plist->next
$4 = {prefix = 0x607140 "/home/doko/.local/bin/", next = 0x607340}
(gdb) p *pprefix->plist->next->next
$5 = {prefix = 0x607360 "/usr/local/bin/", next = 0x607380}
(gdb) p *pprefix->plist->next->next->next
$6 = {prefix = 0x0, next = 0x6073c0}
(gdb) p *pprefix->plist->next->next->next->next
$7 = {prefix = 0x6073e0 "/bin/", next = 0x607400}
(gdb) p *pprefix->plist->next->next->next->next->next
$8 = {prefix = 0x607420 "/usr/local/games/", next = 0x607440}
(gdb) p *pprefix->plist->next->next->next->next->next->next
$9 = {prefix = 0x607460 "/usr/games/", next = 0x0}
looks like the next var of the previous entry is not correctly set.
