Gisle,
Just for the record, you are absolutely sure that lwip_init() has
already been called when using this menu? That would explain the
null-pointer + some_offset....
If you have, a small investigation report and some more information is
really needed - you cannot expect us to magically look into your code.
To start with: which LWIP version are you using? What does your "little
lwIp test program" look like? Can you share some of its code with us?
What have you found out yourself already?
Further: at which index does the fault occur? What are your
MEMP_NUM_XXXX definitions valued at? Do the other stats work? Has any
traffic already occurred? Without any information I don't think your
issue will be solved any time soon....
Regards,
Eric.
On 11/30/24 18:16, Gisle Vanem via lwip-users wrote:
I've built a little lwIp test program with
a small menu-like interface:
LwIP> h
m: print memory stats.
n: print TCP netstat.
p: print mem-pool stats.
S: print system stats.
s: print protocol stats.
h: this help.
i: print IPv4/IPv6 address, network-mask, gateway.
q: quit program.
Pressing 'p' calls this:
for (int i = 0; i < MEMP_MAX; i++)
MEMP_STATS_DISPLAY (i);
When building with clang-cl and ASAN (-fsanitize=address)
on Win-10, running it and pressing 'p', ASAN kicks in to
report this:
=================================================================
==9008==ERROR: AddressSanitizer: access-violation on unknown address
0x000000001788 (pc 0x7ff6b93a8c0e bp 0x0022928ffa60 sp 0x0022928ff780 T0)
==9008==The signal is caused by a READ memory access.
==9008==*** WARNING: Failed to initialize DbgHelp! ***
==9008==*** Most likely this means that the app is already ***
==9008==*** using DbgHelp, possibly with incompatible flags. ***
==9008==*** Due to technical reasons, symbolization might crash ***
==9008==*** or produce wrong results. ***
#0 0x7ff6b93a8c0d in stats_display_memp
F:\MinGW32\src\inet\lwip\src\core\stats.c:119
#1 0x7ff6b935eea9 in main_loop
F:\MinGW32\src\inet\lwip\contrib\ports\win32\test.c:1126
#2 0x7ff6b935eea9 in main
F:\MinGW32\src\inet\lwip\contrib\ports\win32\test.c:1229
#3 0x7ff6b94260f7 in invoke_main
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:78
#4 0x7ff6b94260f7 in __scrt_common_main_seh
D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
#5 0x7ffcdee37373 (C:\Windows\System32\KERNEL32.DLL+0x180017373)
#6 0x7ffce085cc90 (C:\Windows\SYSTEM32\ntdll.dll+0x18004cc90)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: access-violation
F:\MinGW32\src\inet\lwip\src\core\stats.c:119 in stats_display_memp
==9008==ABORTING
I fail to understand why. A bug in 'stats.c' or my code?
The offending code is simply:
void
stats_display_memp(struct stats_mem *mem, int idx)
{
if (idx < MEMP_MAX) {
stats_display_mem(mem, mem->name); // line 119
}
}
Why isn't 'idx' used in the call here?
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