[10536] in Athena Bugs
AIX 3.2 adb file descriptor leak
daemon@ATHENA.MIT.EDU (John Carr)
Sun Jun 6 06:37:16 1993
To: bugs@Athena.MIT.EDU
Date: Sun, 06 Jun 1993 06:37:11 EDT
From: John Carr <jfc@Athena.MIT.EDU>
This program demonstrates a file descriptor leak in AIX 3.2 adb.
----------------
#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
main(int argc, char *argv[])
{
struct stat st;
int i;
for (i = 0; i < 64; i++)
{
if (fstat(i, &st) == -1)
if (errno == EBADF)
continue;
else
printf("%d: error %d\n", i, errno);
printf("%d: dev %d, %d inode %d mode %o\n", i, st.st_dev >> 16,
st.st_dev & 0xffff, st.st_ino, st.st_mode);
}
return 0;
}
----------------
If run from a shell it prints:
0: dev 10, 5 inode 526 mode 21622
1: dev 10, 5 inode 526 mode 21622
2: dev 10, 5 inode 526 mode 21622
which is to be expected: 3 file descriptors are open and the rest are
closed.
If run from adb it prints:
0: dev 10, 5 inode 526 mode 21622
1: dev 10, 5 inode 526 mode 21622
2: dev 10, 5 inode 526 mode 21622
3: dev 32768, 19 inode 4118 mode 100775
5: dev 32768, 19 inode 4118 mode 100775
File descriptors 3 and 5 are the program. If run again from adb even
more file descriptors are open:
0: dev 10, 5 inode 526 mode 21622
1: dev 10, 5 inode 526 mode 21622
2: dev 10, 5 inode 526 mode 21622
3: dev 32768, 19 inode 4118 mode 100775
4: dev 32768, 19 inode 4118 mode 100775
5: dev 32768, 19 inode 4118 mode 100775
6: dev 10, 6 inode 4207 mode 100555
7: dev 10, 6 inode 4207 mode 100555
8: dev 32768, 19 inode 4118 mode 100775
10: dev 32768, 19 inode 4118 mode 100775
14: dev 32768, 19 inode 4118 mode 100775
15: dev 32768, 19 inode 4118 mode 100775
Inode 4207 on device (10,6) is /usr/ccs/lib/libc.a. This leak doesn't
seem to stop; I had adb using over 64 file descriptors after running
the program about 10-15 times.
Please report this to IBM.
"what /usr/bin/adb" says:
22 1.12 R2/cmd/adb/opcode.c, bos, bos320 6/15/90 16:57:22
17 1.15 com/cmd/adb/sym.c, bos, bos320 6/19/91 18:37:35
%M 1.13 com/cmd/adb/output.c, bos, bos320 6/19/91 18:46:00
19 1.9 R2/cmd/adb/extern.c, bos, bos320 6/15/90 16:57:07
%M 1.13 com/cmd/adb/access.c, bos, bos320 6/19/91 18:36:27
16 1.26 com/cmd/adb/setup.c, bos, bos320 6/19/91 18:37:31
02 1.18 com/cmd/adb/expr.c, bos, bos320 6/19/91 18:36:35
%M 1.9 com/cmd/adb/format.c, bos, bos320 6/19/91 18:36:43
%M 1.17 com/cmd/adb/print.c, bos, bos320 6/19/91 18:37:23
15 1.25 com/cmd/adb/runpcs.c, bos, bos320 6/19/91 18:37:27
27 1.13 R2/cmd/adb/steps.c, bos, bos320 6/19/91 18:24:38
00 1.15 com/cmd/adb/command.c, bos, bos320 6/19/91 18:36:30
%M 1.14 com/cmd/adb/pcs.c, bos, bos320 6/19/91 18:37:19
78 1.7 com/lib/ld/ldopen.c, bos, bos320 4/16/91 05:17:04
62 1.4 com/lib/ld/allocldptr.c, bos, bos320 4/16/91 05:16:07
68 1.3 com/lib/ld/lddef.h, bos, bos320 6/16/90 02:02:20
20 1.21 R2/cmd/adb/machdep.c, bos, bos320 6/19/91 18:18:18
65 1.7 com/lib/ld/ldahread.c, bos, bos320 4/16/91 05:16:18
%M 1.15 com/cmd/adb/main.c, bos, bos320 6/19/91 18:37:03
