Reporting m4 bug

[Neha Jain33]

Hi,

 

I am trying to build m4 package but its hanging during testcase validation

 

Package details

m4 1.4.19

 

Machine details

operating system: AIX/PPC

oslevel: 7.1.0.0

 

what is the issue:

one of the testcase is hanging

 

hanged after this

PASS: test-sigsegv-catch-segv1

PASS: test-sigsegv-catch-segv2

PASS: test-sigsegv-catch-stackoverflow1

 

ps -ef output:

root 11010342  7078448   0 05:44:31  pts/0  0:00 /bin/sh ../build-aux/test-driver --test-name test-sigsegv-catch-stackoverflow2 --log-file test-sigsegv-catch-stackoverflow2.log --trs-file test-sigsegv-catch-stackoverflow2.trs --color-tests no --enable-hard-errors yes --expect-failure no -- ./test-sigsegv-catch-stackoverflow2

root 11927964 11010342  61 05:44:31  pts/0 12:57 ./test-sigsegv-catch-stackoverflow2

 

If I run this testcase manually its working but if we run it with all test cases then its hanging

# r-tests no --enable-hard-errors yes --expect-failure no -- ./test-sigsegv-catch-stackoverflow2                                                                                          <

+ /bin/sh ../build-aux/test-driver --test-name test-sigsegv-catch-stackoverflow2 --log-file test-sigsegv-catch-stackoverflow2.log --trs-file test-sigsegv-catch-stackoverflow2.trs --color-tests no --enable-hard-errors yes --expect-failure no -- ./test-sigsegv-catch-stackoverflow2

PASS: test-sigsegv-catch-stackoverflow2

 

# ./test-sigsegv-catch-stackoverflow2

+ ./test-sigsegv-catch-stackoverflow2

Starting recursion pass 1.

Stack overflow 1 caught.

Starting recursion pass 2.

Stack overflow 2 caught.

Segmentation violation correctly detected.

Segmentation violation correctly detected.

Test passed.

 

 

Info on stack

attached a process to dbx and found below details

 

Waiting to attach to process 7733970 ...

Successfully attached to test-sigsegv-catch-stackoverflow.

Type 'help' for help.

reading symbolic information ...

stopped in is_mapped at line 621 in file ""

is_mapped(addr = 9), line 621 in "stackvma.c"

is_unmapped(addr1 = 4, addr2 = 15), line 768 in "stackvma.c"

mincore_is_near_this(addr = 10, vma = 0x0000000111001fb8), line 793 in "stackvma.c"

unnamed block in sigsegv.sigsegv_handler(sig = 11, sip = 0x0000000111002310, ucp = 0x0000000111002060), line 973 in "sigsegv.c"

unnamed block in sigsegv.sigsegv_handler(sig = 11, sip = 0x0000000111002310, ucp = 0x0000000111002060), line 973 in "sigsegv.c"

sigsegv.sigsegv_handler(sig = 11, sip = 0x0000000111002310, ucp = 0x0000000111002060), line 973 in "sigsegv.c"

main(), line 183 in "test-sigsegv-catch-stackoverflow2.c"

 

code snippet

location:/home/buildusr/rpmbuild/BUILD/m4-1.4.19/64bit/lib/stackvma.c

seems like its stuck here in for loop

 

  754   for (;;)

    755     {

    756       uintptr_t addr_stepsize;

    757       uintptr_t i;

    758       uintptr_t addr;

    759

    760       stepsize = stepsize / 2;

    761       if (stepsize == 0)

    762         break;

    763       addr_stepsize = stepsize * pagesize;

    764       for (i = stepsize, addr = addr1 + addr_stepsize;

    765            i < count;

    766            i += 2 * stepsize, addr += 2 * addr_stepsize)

    767         /* Here addr = addr1 + i * pagesize.  */

    768         if (is_mapped (addr))

    769           return 0;

    770     }

 

configure details

./configure     --prefix=%{_prefix} \

                --mandir=%{_mandir} \

                --infodir=%{_infodir} \

                --enable-largefile

                                                           

 

Thanks,

Neha Jain