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Hi, I got this error when compiling "crrej":wfpc> crrej
Input images (u48z9501r_c0f.fits[0][*,*,1],u48z9502m_c0f.fits[0][*,*,1]):
Output image name (temp.fits):
Input/output masks (optional):
Rejections levels in each iteration (8,6,4):
*** glibc detected *** /home/stsdas/bin.redhat/x_wfpc.e: realloc(): invalid next size: 0x0a17fc60 ***
======= Backtrace: =========
/lib/libc.so.6[0x1dc380]
/lib/libc.so.6(realloc+0xfe)[0x1dd20e]
/home/stsdas/bin.redhat/x_wfpc.e[0x81fd10d]
/home/stsdas/bin.redhat/x_wfpc.e[0x81d9e00]
/home/stsdas/bin.redhat/x_wfpc.e[0x81da226]
/home/stsdas/bin.redhat/x_wfpc.e[0x8164805]
/home/stsdas/bin.redhat/x_wfpc.e[0x8163b37]
/home/stsdas/bin.redhat/x_wfpc.e[0x815f05e]
/home/stsdas/bin.redhat/x_wfpc.e[0x816022c]
/home/stsdas/bin.redhat/x_wfpc.e[0x815e0a4]
/home/stsdas/bin.redhat/x_wfpc.e[0x81f4972]
/home/stsdas/bin.redhat/x_wfpc.e[0x816fc23]
/home/stsdas/bin.redhat/x_wfpc.e[0x8152148]
/home/stsdas/bin.redhat/x_wfpc.e[0x8151d23]
/home/stsdas/bin.redhat/x_wfpc.e[0x80920da]
/home/stsdas/bin.redhat/x_wfpc.e[0x8090e01]
/home/stsdas/bin.redhat/x_wfpc.e[0x804d6b0]
/home/stsdas/bin.redhat/x_wfpc.e(strftime+0x27e8)[0x804c800]
/home/stsdas/bin.redhat/x_wfpc.e(strftime+0x22ff)[0x804c317]
/home/stsdas/bin.redhat/x_wfpc.e(realpath+0x3e6)[0x804a9be]
/home/stsdas/bin.redhat/x_wfpc.e[0x81d532a]
/home/stsdas/bin.redhat/x_wfpc.e[0x8145b14]
/lib/libc.so.6(__libc_start_main+0xdc)[0x188dec]
/home/stsdas/bin.redhat/x_wfpc.e(sinh+0x49)[0x804a6d1]
======= Memory map: ========
00156000-0016f000 r-xp 00000000 fd:00 5701671 /lib/ld-2.5.so
0016f000-00170000 r-xp 00019000 fd:00 5701671 /lib/ld-2.5.so
00170000-00171000 rwxp 0001a000 fd:00 5701671 /lib/ld-2.5.so
00173000-002ad000 r-xp 00000000 fd:00 5701673 /lib/libc-2.5.so
002ad000-002af000 r-xp 0013a000 fd:00 5701673 /lib/libc-2.5.so
002af000-002b0000 rwxp 0013c000 fd:00 5701673 /lib/libc-2.5.so
002b0000-002b3000 rwxp 002b0000 00:00 0
002b5000-002da000 r-xp 00000000 fd:00 5701721 /lib/libm-2.5.so
002da000-002db000 r-xp 00024000 fd:00 5701721 /lib/libm-2.5.so
002db000-002dc000 rwxp 00025000 fd:00 5701721 /lib/libm-2.5.so
0055c000-00567000 r-xp 00000000 fd:00 5701849 /lib/libgcc_s-4.1.2-20070626.so.1
00567000-00568000 rwxp 0000a000 fd:00 5701849 /lib/libgcc_s-4.1.2-20070626.so.1
00d95000-00da4000 r-xp 00000000 fd:00 5701850 /lib/libresolv-2.5.so
00da4000-00da5000 r-xp 0000e000 fd:00 5701850 /lib/libresolv-2.5.so
00da5000-00da6000 rwxp 0000f000 fd:00 5701850 /lib/libresolv-2.5.so
00da6000-00da8000 rwxp 00da6000 00:00 0
08048000-08213000 r-xp 00000000 fd:00 7997998 /home/stsdas/bin.redhat/x_wfpc.e
08213000-0823a000 rwxp 001cb000 fd:00 7997998 /home/stsdas/bin.redhat/x_wfpc.e
0823a000-08d6d000 rwxp 0823a000 00:00 0
0a113000-0a1ab000 rwxp 0a113000 00:00 0
40000000-40001000 r-xp 40000000 00:00 0 [vdso]
4001a000-4005e000 rwxp 4001a000 00:00 0
4005e000-40067000 r-xp 00000000 fd:00 5701672 /lib/libnss_files-2.5.so
40067000-40068000 r-xp 00008000 fd:00 5701672 /lib/libnss_files-2.5.so
40068000-40069000 rwxp 00009000 fd:00 5701672 /lib/libnss_files-2.5.so
40069000-4006d000 r-xp 00000000 fd:00 5701670 /lib/libnss_dns-2.5.so
4006d000-4006e000 r-xp 00003000 fd:00 5701670 /lib/libnss_dns-2.5.so
4006e000-4006f000 rwxp 00004000 fd:00 5701670 /lib/libnss_dns-2.5.so
40100000-40121000 rwxp 40100000 00:00 0
40121000-40200000 --xp 40121000 00:00 0
bf846000-bf85c000 rwxp bf846000 00:00 0 [stack]Then stuck forever until I close the terminal. I tried again and it stuck again. Please help...

The error is some general sort of memory corruption, but without the data or parameters to reproduce it I can't really say more. Since this is an STSDAS calibration task your best bet may be the ST helpdesk (help@stsci.edu). They would probably want to know which IRAF and STSDAS version you are using.Note I'm assuming you're using a version that has the Jan14 critical update installed and that your STSDAS was linked against that. This fixed something that could explain your problem, especially because of your use of image sections.Cheers,
-Mike

Thanks Mike, I will try to get some help there.