On 02/06/2014 07:39 AM, Miraj Mohamed wrote: > Hi All, > > > We see our application Hanging at shmctl (SHM_LOCK). > > > > Kernel : 2.6.32-358.el6.x86_64 > > OS : Red Hat Enterprise Linux Server release 6.4 (Santiago) > > > > > > 1. When it hangs, this is what strace gives: > > > > [RHEL6.4 at 10.201.0.221 bin]# strace -p 23793 Process 23793 attached - interrupt to quit [ Process PID=23793 runs in 32 bit mode. ] > > shmget(0x110c1be, 16777216, 0666) = 3801140 > > shmat(3801140, 0, 0) = 0x85c2c70e7755000 > > shmctl(3801140, IPC_64|SHM_LOCK, 0^C <unfinished ...> > > > > > > > > 2. When we kill the application and generate a core file, Here is what gdb shows: > > > > Core was generated by ` <our application> 12 12 10.33.0.230 eth1 -1 0 3 fd5d:d50a:8c17:3300::e6'. > > Program terminated with signal 6, Aborted. > > #0 0x007c2430 in __kernel_vsyscall () > > Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.107.el6.i686 libgcc-4.4.7-3.el6.i686 libstdc++-4.4.7-3.el6.i686 > > (gdb) bt > > #0 0x007c2430 in __kernel_vsyscall () > > #1 0x008a8d8e in shmctl@@GLIBC_2.2 () from /lib/libc.so.6 > > #2 0x0847c13e in MpcMpSwms_SwibIfShmSegOpen (ps=<value optimized out>, ctl=<value optimized out>) > > at src/MpcMpSwms_SwibIfShm.c:271 > > #3 0x0847c551 in MpcMpSwms_SwibIfShmOpen (pvs=0xb0e8984, pvctl=0xffc35354) at src/MpcMpSwms_SwibIfShm.c:379 > > #4 0x0847bb9f in MpcMpSwms_SwibIfOpen (ps=0xb0e7dc4, ctl=0xffc35354, swib_if=SWIB_IF_SHM) at src/MpcMpSwms_SwibIf.c:126 > > #5 0x080b792a in MpcMpSwms_SwibOpen (ps=0xa019da8, ctl=0xffc357d8) at src/MpcMpSwms_Swib.c:253 > > #6 0x080b63a0 in main (argc=9, argv=0xffc35924) at src/MpcMpSwms_Main.c:1364 > > (gdb) > > > > > > What could be the reason for hanging? > > Any solution? > > This is a CENTOS mailing list, not Red Hat's. Please go to Red Hat bugzilla and report your problem there. -- Ljubomir Ljubojevic (Love is in the Air) PL Computers Serbia, Europe StarOS, Mikrotik and CentOS/RHEL/Linux consultant