Comments (11)
cunha
commented on August 22, 2024
Can you provide additional information to help us track the problem? A stack trace of strace would help.
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dragonxtek
commented on August 22, 2024
Can you provide additional information to help us track the problem? A stack trace of
stracewould help.
Here it is
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rlcalmeida
commented on August 22, 2024
@dragonxtek, please try upgrading libpcap. Version 1.8.1 should suffices.
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dragonxtek
commented on August 22, 2024
@dragonxtek, please try upgrading libpcap. Version 1.8.1 should suffices.
I installed the last version (1.9) and I have the same issue
Here it is the new strace log
logv2.txt
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cunha
commented on August 22, 2024
I meant to ask for a (GDB) stack trace on my first message but a typo made that unclear. Can you compile with debug symbols and run it inside `GDB` so we get a better idea of where the segfault is happening?
Another thing that would help is to `valgrind --leak-check=full --show-reachable=yes ./mtraceroute 8.8.8.8 -c mda`.
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cunha
commented on August 22, 2024
==20055== HEAP SUMMARY:
==20055== in use at exit: 64 bytes in 3 blocks
==20055== total heap usage: 4,296 allocs, 4,293 frees, 138,665 bytes allocated
==20055==
==20055== 16 bytes in 1 blocks are indirectly lost in loss record 1 of 3
==20055== at 0x4C2DBC5: calloc (vg_replace_malloc.c:711)
==20055== by 0x10E5D5: addr_to_str (addr.c:128)
==20055== by 0x10E635: addr_bytes_to_str (addr.c:138)
==20055== by 0x10B639: mda_read_response.constprop.5 (mt_mda.c:419)
==20055== by 0x10BCE1: is_per_packet (mt_mda.c:513)
==20055== by 0x10BCE1: mda (mt_mda.c:743)
==20055== by 0x10C0F6: mt_mda (mt_mda.c:773)
==20055== by 0x1091BB: main (mt.c:289)
==20055==
==20055== 24 bytes in 1 blocks are indirectly lost in loss record 2 of 3
==20055== at 0x4C2BBAF: malloc (vg_replace_malloc.c:299)
==20055== by 0x10EA55: list_insert (list.c:48)
==20055== by 0x10C043: is_per_packet (mt_mda.c:515)
==20055== by 0x10C043: mda (mt_mda.c:743)
==20055== by 0x10C0F6: mt_mda (mt_mda.c:773)
==20055== by 0x1091BB: main (mt.c:289)
==20055==
==20055== 64 (24 direct, 40 indirect) bytes in 1 blocks are definitely lost in loss record 3 of 3
==20055== at 0x4C2BBAF: malloc (vg_replace_malloc.c:299)
==20055== by 0x10EA1D: list_create (list.c:33)
==20055== by 0x10BC67: is_per_packet (mt_mda.c:506)
==20055== by 0x10BC67: mda (mt_mda.c:743)
==20055== by 0x10C0F6: mt_mda (mt_mda.c:773)
==20055== by 0x1091BB: main (mt.c:289)
@rlcalmeida let's check these leaks in the meantime while @dragonxtek gets us the dump with the incorrect memory accesses.
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dragonxtek
commented on August 22, 2024
Another thing that would help is to
valgrind --leak-check=full --show-reachable=yes ./mtraceroute 8.8.8.8 -c mda.
Here it is
valgrind.txt
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dragonxtek
commented on August 22, 2024
I meant to ask for a (GDB) stack trace on my first message but a typo made that unclear. Can you compile with debug symbols and run it inside
GDBso we get a better idea of where the segfault is happening? `.
I tried with ping option:
(gdb) run
Starting program: /usr/local/bin/mtraceroute 8.8.8.8 -c ping
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x000055555555acb3 in dst_create (a=<optimized out>, ip_dst=0x555555562590) at dst.c:59
59 d->ip_dst = ip_dst;
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rlcalmeida
commented on August 22, 2024
@dragonxtek can you compile with -g -O0 and provide gdb's backtrace output?
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cunha
commented on August 22, 2024
From @dragonxtek's valgrind dump:
==32117== Command: mtraceroute 8.8.8.8 -c mda
==32117==
==32117== Invalid read of size 8
==32117== at 0x10ECB3: dst_create (dst.c:61)
==32117== by 0x109328: main (mt.c:278)
==32117== Address 0x10 is not stack'd, malloc'd or (recently) free'd
==32117==
==32117==
==32117== Process terminating with default action of signal 11 (SIGSEGV)
==32117== Access not within mapped region at address 0x10
==32117== at 0x10ECB3: dst_create (dst.c:61)
==32117== by 0x109328: main (mt.c:278)
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dragonxtek
commented on August 22, 2024
@dragonxtek can you compile with -g -O0 and provide gdb's backtrace output?
(gdb) run
Starting program: /usr/local/bin/mtraceroute 8.8.8.8 -c ping
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Program received signal SIGSEGV, Segmentation fault.
0x000055555555acb3 in dst_create (a=<optimized out>, ip_dst=0x555555562590) at dst.c:59
59 d->ip_dst = ip_dst;
(gdb) backtrace
#0 0x000055555555acb3 in dst_create (a=<optimized out>, ip_dst=0x555555562590) at dst.c:59
#1 0x0000555555555329 in main (argc=<optimized out>, argv=<optimized out>) at mt.c:278
(gdb) backtrace full
#0 0x000055555555acb3 in dst_create (a=<optimized out>, ip_dst=0x555555562590) at dst.c:59
d = 0x5555555625b0
r = 0x5555555625e0
n = 0x0
i = 0x5555555637f0
if_ip = 0x555555562820
#1 0x0000555555555329 in main (argc=<optimized out>, argv=<optimized out>) at mt.c:278
args = 0x555555562260
a = 0x5555555624a0
d = <optimized out>
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