Yea - I get a $hit load of errors relating to libc: libc.so.6. For
example:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb6b40b90 (LWP 9454)]
0x0052fbaa in free () from /lib/libc.so.6
(gdb)
(gdb)
(gdb)
(gdb)
(gdb)
(gdb) info threads
7 Thread 0xb31dbb90 (LWP 9458) 0x006fd402 in __kernel_vsyscall ()
6 Thread 0xb3bdcb90 (LWP 9457) 0x006fd402 in __kernel_vsyscall ()
5 Thread 0xb45ddb90 (LWP 9456) 0x006fd402 in __kernel_vsyscall ()
4 Thread 0xb5fffb90 (LWP 9455) 0x006fd402 in __kernel_vsyscall ()
* 3 Thread 0xb6b40b90 (LWP 9454) 0x0052fbaa in free () from
/lib/libc.so.6
2 Thread 0xb7541b90 (LWP 9453) 0x006fd402 in __kernel_vsyscall ()
1 Thread 0xb7f3b6d0 (LWP 9448) 0x006fd402 in __kernel_vsyscall ()
(gdb) info stack
#0 0x0052fbaa in free () from /lib/libc.so.6
#1 0x009a944c in ntop_safefree (ptr=0x59e80c7d, file=0xa0bdc8
"sessions.c",
line=380) at leaks.c:178
#2 0x009c9e53 in freeSession (sessionToPurge=0xeb463f0,
actualDeviceId=1,
allocateMemoryIfNeeded=1 '\001', lockMutex=0 '\0') at sessions.c:380
#3 0x009ca3b5 in scanTimedoutTCPSessions (actualDeviceId=1) at
sessions.c:548
#4 0x009a0dcf in purgeIdleHosts (actDevice=1) at hash.c:697
#5 0x009abe50 in scanIdleLoop (notUsed=0x0) at ntop.c:691
#6 0x003f149b in start_thread () from /lib/libpthread.so.0
#7 0x0059442e in clone () from /lib/libc.so.6
(gdb) bt full
#0 0x0052fbaa in free () from /lib/libc.so.6
No symbol table info available.
#1 0x009a944c in ntop_safefree (ptr=0x59e80c7d, file=0xa0bdc8
"sessions.c",
line=380) at leaks.c:178
No locals.
#2 0x009c9e53 in freeSession (sessionToPurge=0xeb463f0,
actualDeviceId=1,
allocateMemoryIfNeeded=1 '\001', lockMutex=0 '\0') at sessions.c:380
__t = (void *) 0xa22be8
#3 0x009ca3b5 in scanTimedoutTCPSessions (actualDeviceId=1) at
sessions.c:548
nextSession = (IPSession *) 0xbbdfc58
prevSession = (IPSession *) 0x110f76a8
theSession = (IPSession *) 0xeb463f0
_idx = 5793
freeSessionCount = 637
purgeLimit = 11992
idx = 0
#4 0x009a0dcf in purgeIdleHosts (actDevice=1) at hash.c:697
idx = 32768
numFreedBuckets = 55
numHosts = 55
now = 1248137967
theFlaggedHosts = (HostTraffic **) 0xe80b3b8
maxHosts = 1686
---Type <return> to continue, or q <return> to quit---
scannedHosts = 1687
hiresDeltaTime = 0
hiresTimeStart = {tv_sec = 1248137967, tv_usec = 638357}
hiresTimeEnd = {tv_sec = 1248137967, tv_usec = 638292}
el = <value optimized out>
prev = (HostTraffic *) 0xa8fcf68
next = <value optimized out>
lastPurgeTime = {1248137967, 1248137967, 0 <repeats 30 times>}
firstRun = 0 '\0'
#5 0x009abe50 in scanIdleLoop (notUsed=0x0) at ntop.c:691
i = 1
#6 0x003f149b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#7 0x0059442e in clone () from /lib/libc.so.6
No symbol table info available.
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb6b0cb90 (LWP 7977)]
0x00cbdbaa in free () from /lib/libc.so.6
(gdb) list
394 #endif
395 int i, rc, userSpecified;
396 char ifStr[196] = {0};
397 time_t lastTime;
398 char *cmdLineBuffer, *readBuffer, *readBufferWork;
399 FILE *fd;
400 struct stat fileStat;
401 int effective_argc;
402 char **effective_argv;
403 time_t endTime;
(gdb) info threads
7 Thread 0xb32e7b90 (LWP 7994) 0x002fc402 in __kernel_vsyscall ()
6 Thread 0xb3ce8b90 (LWP 7980) 0x002fc402 in __kernel_vsyscall ()
5 Thread 0xb46e9b90 (LWP 7979) 0x002fc402 in __kernel_vsyscall ()
4 Thread 0xb610bb90 (LWP 7978) 0x002fc402 in __kernel_vsyscall ()
* 3 Thread 0xb6b0cb90 (LWP 7977) 0x00cbdbaa in free () from
/lib/libc.so.6
2 Thread 0xb750db90 (LWP 7976) 0x002fc402 in __kernel_vsyscall ()
1 Thread 0xb7f076d0 (LWP 7973) 0x002fc402 in __kernel_vsyscall ()
(gdb) info stack
#0 0x00cbdbaa in free () from /lib/libc.so.6
#1 0x0031f44c in ntop_safefree (ptr=0xa0012, file=0x381dc8
"sessions.c",
line=380) at leaks.c:178
#2 0x0033fe53 in freeSession (sessionToPurge=0xb03dae00,
actualDeviceId=1,
allocateMemoryIfNeeded=1 '\001', lockMutex=0 '\0') at sessions.c:380
#3 0x003403b5 in scanTimedoutTCPSessions (actualDeviceId=1) at
sessions.c:548
#4 0x00316dcf in purgeIdleHosts (actDevice=1) at hash.c:697
#5 0x00321e50 in scanIdleLoop (notUsed=0x0) at ntop.c:691
#6 0x00b0349b in start_thread () from /lib/libpthread.so.0
#7 0x00d2242e in clone () from /lib/libc.so.6
(gdb) bt full
#0 0x00cbdbaa in free () from /lib/libc.so.6
No symbol table info available.
#1 0x0031f44c in ntop_safefree (ptr=0xa0012, file=0x381dc8
"sessions.c",
line=380) at leaks.c:178
No locals.
#2 0x0033fe53 in freeSession (sessionToPurge=0xb03dae00,
actualDeviceId=1,
allocateMemoryIfNeeded=1 '\001', lockMutex=0 '\0') at sessions.c:380
__t = (void *) 0x398be8
#3 0x003403b5 in scanTimedoutTCPSessions (actualDeviceId=1) at
sessions.c:548
nextSession = (IPSession *) 0xb0634128
prevSession = (IPSession *) 0xb03edc08
theSession = (IPSession *) 0xb03dae00
_idx = 15181
freeSessionCount = 20368
purgeLimit = 20902
idx = 0
#4 0x00316dcf in purgeIdleHosts (actDevice=1) at hash.c:697
idx = 32768
numFreedBuckets = 84
numHosts = 84
now = 1248202238
theFlaggedHosts = (HostTraffic **) 0xae056e0
maxHosts = 2569
---Type <return> to continue, or q <return> to quit---
scannedHosts = 2570
hiresDeltaTime = 0
hiresTimeStart = {tv_sec = 1248202238, tv_usec = 878423}
hiresTimeEnd = {tv_sec = 1248202238, tv_usec = 878344}
el = <value optimized out>
prev = (HostTraffic *) 0xb2468db0
next = <value optimized out>
lastPurgeTime = {1248202238, 1248202238, 0 <repeats 30 times>}
firstRun = 0 '\0'
#5 0x00321e50 in scanIdleLoop (notUsed=0x0) at ntop.c:691
i = 1
#6 0x00b0349b in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#7 0x00d2242e in clone () from /lib/libc.so.6
No symbol table info available.
(gdb)
[r...@monpapp1 ntop]# *** glibc detected *** ./ntop: free(): invalid
pointer: 0x00f9db68 ***
======= Backtrace: =========
/lib/libc.so.6[0x1a90f1]
/lib/libc.so.6(cfree+0x90)[0x1acbc0]
/usr/local/lib/libntop-3.3.11-dev.so(ntop_safefree+0x2c)[0x9a2c7c]
/usr/local/lib/libntop-3.3.11-dev.so(freeSession+0x144)[0x9c2934]
/usr/local/lib/libntop-3.3.11-dev.so(scanTimedoutTCPSessions+0x2a5)[0x9c
2e75]
/usr/local/lib/libntop-3.3.11-dev.so(purgeIdleHosts+0x4af)[0x99a7df]
/usr/local/lib/libntop-3.3.11-dev.so(scanIdleLoop+0x21c)[0x9a578c]
/lib/libpthread.so.0[0x41c49b]
/lib/libc.so.6(clone+0x5e)[0x21142e]
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of
Mike Tremaine
Sent: Thursday, July 23, 2009 11:00 AM
To: [email protected]
Subject: Re: [Ntop] ntop dies, nothing in log.
Gary Gatten wrote:
>
> Running 3.3.10 / 3.3.11 on RHEL 2.6.18-128.1.16.el5 #1 SMP
>
> I have -K and -t 5, no errors in log. Gdb captures the faults so I
> guess I can run in gdb all the time - or not! Any ideas why nothing is
> spewed to the log and how it can be fixed?
>
> TIA!
>
> Gary
>
I get these with logging set to syslog.
Jul 22 20:40:07 ntop ntop[14551]: *** glibc detected ***
/usr/local/bin/ntop: double free or corruption (!prev):
0x000000000132ade0 ***
I haven't used ntop in a few years and I'm getting myself up to speed
again so before I start sending in questions or bugs I want to make sure
I've done all the tweaking I can. But I thought I'd mention that you are
not alone and Redhat/Centos 5 seems to have some minor issues.
-Mike
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