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[LDM #WOM-274153]: Reproducible bug in LDM 6.13.10



Gilbert,

> Ryan graciously gave me a 5 minute maintenance window to crash it.

Thanks, Ryan.

> And
> herrrrrrrrreeeee we go...
> 
> address@hidden ~]# gdb -p 2738
> GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
> >
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Attaching to process 2738
> Reading symbols from /home/ldm/ldm-6.13.10/bin/pqact...done.
> Reading symbols from /home/ldm/ldm-6.13.10/lib/libldm.so.0...done.
> Loaded symbols for /home/ldm/ldm-6.13.10/lib/libldm.so.0
> Reading symbols from /lib64/libgdbm.so.4...Reading symbols from
> /lib64/libgdbm.so.4...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/libgdbm.so.4
> Reading symbols from /lib64/libxml2.so.2...Reading symbols from
> /lib64/libxml2.so.2...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/libxml2.so.2
> Reading symbols from /lib64/libz.so.1...Reading symbols from
> /lib64/libz.so.1...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/libz.so.1
> Reading symbols from /lib64/librt.so.1...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/librt.so.1
> Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
> Loaded symbols for /lib64/libm.so.6
> Reading symbols from /lib64/libpthread.so.0...(no debugging symbols
> found)...done.
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Loaded symbols for /lib64/libpthread.so.0
> Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
> Loaded symbols for /lib64/libc.so.6
> Reading symbols from /lib64/libdl.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/libdl.so.2
> Reading symbols from /lib64/liblzma.so.5...Reading symbols from
> /lib64/liblzma.so.5...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/liblzma.so.5
> Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/ld-linux-x86-64.so.2
> 0x00007f21fc84d546 in sigsuspend () from /lib64/libc.so.6
> Missing separate debuginfos, use: debuginfo-install gdbm-1.10-8.el7.x86_64
> glibc-2.17-260.el7_6.3.x86_64 libxml2-2.9.1-6.el7_2.3.x86_64
> xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-18.el7.x86_64
> (gdb) where
> #0  0x00007f21fc84d546 in sigsuspend () from /lib64/libc.so.6
> #1  0x00007f21fdabf5d0 in pq_suspendAndUnblock (address@hidden,
> address@hidden, address@hidden) at pq.c:8716
> #2  0x00007f21fdabf7d9 in pq_suspend (address@hidden) at
> pq.c:8747
> #3  0x00000000004039c9 in main (ac=<optimized out>, av=<optimized out>)
> at pqact.c:675
> (gdb) q
> A debugging session is active.
> 
> Inferior 1 [process 2738] will be detached.
> 
> Quit anyway? (y or n) y
> Detaching from program: /home/ldm/ldm-6.13.10/bin/pqact, process 2738
> 
> 
> 
> And the other pqact:
> 
> address@hidden ~]# gdb -p 2739
> GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-114.el7
> Copyright (C) 2013 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html
> >
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-redhat-linux-gnu".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Attaching to process 2739
> Reading symbols from /home/ldm/ldm-6.13.10/bin/pqact...done.
> Reading symbols from /home/ldm/ldm-6.13.10/lib/libldm.so.0...done.
> Loaded symbols for /home/ldm/ldm-6.13.10/lib/libldm.so.0
> Reading symbols from /lib64/libgdbm.so.4...Reading symbols from
> /lib64/libgdbm.so.4...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/libgdbm.so.4
> Reading symbols from /lib64/libxml2.so.2...Reading symbols from
> /lib64/libxml2.so.2...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/libxml2.so.2
> Reading symbols from /lib64/libz.so.1...Reading symbols from
> /lib64/libz.so.1...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/libz.so.1
> Reading symbols from /lib64/librt.so.1...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/librt.so.1
> Reading symbols from /lib64/libm.so.6...(no debugging symbols found)...done.
> Loaded symbols for /lib64/libm.so.6
> Reading symbols from /lib64/libpthread.so.0...(no debugging symbols
> found)...done.
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Loaded symbols for /lib64/libpthread.so.0
> Reading symbols from /lib64/libc.so.6...(no debugging symbols found)...done.
> Loaded symbols for /lib64/libc.so.6
> Reading symbols from /lib64/libdl.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/libdl.so.2
> Reading symbols from /lib64/liblzma.so.5...Reading symbols from
> /lib64/liblzma.so.5...(no debugging symbols found)...done.
> (no debugging symbols found)...done.
> Loaded symbols for /lib64/liblzma.so.5
> Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols
> found)...done.
> Loaded symbols for /lib64/ld-linux-x86-64.so.2
> 0x00007f22a791f546 in sigsuspend () from /lib64/libc.so.6
> Missing separate debuginfos, use: debuginfo-install gdbm-1.10-8.el7.x86_64
> glibc-2.17-260.el7_6.3.x86_64 libxml2-2.9.1-6.el7_2.3.x86_64
> xz-libs-5.2.2-1.el7.x86_64 zlib-1.2.7-18.el7.x86_64
> (gdb) where
> #0  0x00007f22a791f546 in sigsuspend () from /lib64/libc.so.6
> #1  0x00007f22a8b915d0 in pq_suspendAndUnblock (address@hidden,
> address@hidden, address@hidden) at pq.c:8716
> #2  0x00007f22a8b917d9 in pq_suspend (address@hidden) at
> pq.c:8747
> #3  0x00000000004039c9 in main (ac=<optimized out>, av=<optimized out>)
> at pqact.c:675
> (gdb) q
> A debugging session is active.
> 
> Inferior 1 [process 2739] will be detached.
> 
> Quit anyway? (y or n) y
> Detaching from program: /home/ldm/ldm-6.13.10/bin/pqact, process 2739
> 
> Do you make any sense of this?

I'm surprised they were hung in pq_suspend().

What version of the LDM is this?

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: WOM-274153
Department: Support LDM
Priority: High
Status: Closed
===================
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