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Date: Wed, 15 Jul 2015 16:09:03 +0200
From: Marc Dietrich <marvin24@....de>
To: netdev@...r.kernel.org
Subject: "ss -p" segfaults
Hi,
ss -p segfaults here with some kind of memory corruption:
*** Error in `/work/iproute2/misc/ss': free(): invalid pointer:
0x0000000000623000 ***
======= Backtrace: =========
/lib64/libc.so.6(+0x71c6d)[0x7ffff7885c6d]
/lib64/libc.so.6(+0x771be)[0x7ffff788b1be]
/lib64/libc.so.6(+0x7799b)[0x7ffff788b99b]
/work/iproute2/misc/ss[0x403de1]
/work/iproute2/misc/ss[0x408247]
/work/iproute2/misc/ss[0x403295]
/lib64/libc.so.6(__libc_start_main+0xf0)[0x7ffff7834790]
/work/iproute2/misc/ss[0x4037f9]
======= Memory map: ========
00400000-00416000 r-xp 00000000 00:33 4207305
/work/iproute2/misc/ss
00616000-00617000 r--p 00016000 00:33 4207305
/work/iproute2/misc/ss
00617000-0061b000 rw-p 00017000 00:33 4207305
/work/iproute2/misc/ss
0061b000-0065f000 rw-p 00000000 00:00 0
[heap]
7ffff6f6d000-7ffff6f83000 r-xp 00000000 00:21 16154175
/lib64/libgcc_s.so.1
7ffff6f83000-7ffff7182000 ---p 00016000 00:21 16154175
/lib64/libgcc_s.so.1
7ffff7182000-7ffff7183000 r--p 00015000 00:21 16154175
/lib64/libgcc_s.so.1
7ffff7183000-7ffff7184000 rw-p 00016000 00:21 16154175
/lib64/libgcc_s.so.1
7ffff7184000-7ffff719c000 r-xp 00000000 00:21 16694826
/lib64/libpthread-2.21.so
7ffff719c000-7ffff739b000 ---p 00018000 00:21 16694826
/lib64/libpthread-2.21.so
7ffff739b000-7ffff739c000 r--p 00017000 00:21 16694826
/lib64/libpthread-2.21.so
7ffff739c000-7ffff739d000 rw-p 00018000 00:21 16694826
/lib64/libpthread-2.21.so
7ffff739d000-7ffff73a1000 rw-p 00000000 00:00 0
7ffff73a1000-7ffff73a4000 r-xp 00000000 00:21 16694804
/lib64/libdl-2.21.so
7ffff73a4000-7ffff75a3000 ---p 00003000 00:21 16694804
/lib64/libdl-2.21.so
7ffff75a3000-7ffff75a4000 r--p 00002000 00:21 16694804
/lib64/libdl-2.21.so
7ffff75a4000-7ffff75a5000 rw-p 00003000 00:21 16694804
/lib64/libdl-2.21.so
7ffff75a5000-7ffff7613000 r-xp 00000000 00:21 16153198
/usr/lib64/libpcre.so.1.2.5
7ffff7613000-7ffff7812000 ---p 0006e000 00:21 16153198
/usr/lib64/libpcre.so.1.2.5
7ffff7812000-7ffff7813000 r--p 0006d000 00:21 16153198
/usr/lib64/libpcre.so.1.2.5
7ffff7813000-7ffff7814000 rw-p 0006e000 00:21 16153198
/usr/lib64/libpcre.so.1.2.5
7ffff7814000-7ffff79ad000 r-xp 00000000 00:21 16694798
/lib64/libc-2.21.so
7ffff79ad000-7ffff7bac000 ---p 00199000 00:21 16694798
/lib64/libc-2.21.so
7ffff7bac000-7ffff7bb1000 r--p 00198000 00:21 16694798
/lib64/libc-2.21.so
7ffff7bb1000-7ffff7bb3000 rw-p 0019d000 00:21 16694798
/lib64/libc-2.21.so
7ffff7bb3000-7ffff7bb7000 rw-p 00000000 00:00 0
7ffff7bb7000-7ffff7bd8000 r-xp 00000000 00:21 16155991
/lib64/libselinux.so.1
7ffff7bd8000-7ffff7dd7000 ---p 00021000 00:21 16155991
/lib64/libselinux.so.1
7ffff7dd7000-7ffff7dd8000 r--p 00020000 00:21 16155991
/lib64/libselinux.so.1
7ffff7dd8000-7ffff7dd9000 rw-p 00021000 00:21 16155991
/lib64/libselinux.so.1
7ffff7dd9000-7ffff7ddb000 rw-p 00000000 00:00 0
7ffff7ddb000-7ffff7dfc000 r-xp 00000000 00:21 16694791
/lib64/ld-2.21.so
7ffff7fb5000-7ffff7fba000 rw-p 00000000 00:00 0
7ffff7ff5000-7ffff7ff8000 rw-p 00000000 00:00 0
7ffff7ff8000-7ffff7ffa000 r--p 00000000 00:00 0
[vvar]
7ffff7ffa000-7ffff7ffc000 r-xp 00000000 00:00 0
[vdso]
7ffff7ffc000-7ffff7ffd000 r--p 00021000 00:21 16694791
/lib64/ld-2.21.so
7ffff7ffd000-7ffff7ffe000 rw-p 00022000 00:21 16694791
/lib64/ld-2.21.so
7ffff7ffe000-7ffff7fff000 rw-p 00000000 00:00 0
7ffffffdd000-7ffffffff000 rw-p 00000000 00:00 0
[stack]
ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
[vsyscall]
Program received signal SIGABRT, Aborted.
0x00007ffff7847638 in raise () from /lib64/libc.so.6
Missing separate debuginfos, use: zypper install libgcc_s1-
debuginfo-5.1.1+r224716-1.2.x86_64 libpcre1-debuginfo-8.37-1.18.x86_64
libselinux1-debuginfo-2.3-5.18.x86_64
(gdb) bt full
#0 0x00007ffff7847638 in raise () from /lib64/libc.so.6
No symbol table info available.
#1 0x00007ffff7848a1a in abort () from /lib64/libc.so.6
No symbol table info available.
#2 0x00007ffff7885c72 in __libc_message () from /lib64/libc.so.6
No symbol table info available.
#3 0x00007ffff788b1be in malloc_printerr () from /lib64/libc.so.6
No symbol table info available.
#4 0x00007ffff788b99b in _int_free () from /lib64/libc.so.6
No symbol table info available.
#5 0x0000000000403de1 in unix_list_free (list=0x6251a0, list@...ry=0x645b50)
at ss.c:2516
s = 0x623010
name = 0x272 <error: Cannot access memory at address 0x272>
#6 0x0000000000408247 in unix_show (f=0x61cdf0 <current_filter>) at ss.c:2798
buf = "ffff880205a15b00: 00000003 00000000 00000000 0001 03
84307\n\000/tmp/.X11-
unix/X0\n\000/stdout\n\000adiserver.socket\n\000\n\000c\n\000cket\n", '\000'
<repeats 12 times>,
"q\017A\000\000\000\000\000p\205\201\367\377\177\000\000x\323\377\377\377\177\000\000\067\v\000\000\000\000\000\000h\323\377\377\377\177\000\000\060\374\336\367\377\177\000\000\000U\000\000\005\000\000\000\277\000\000\000;
\212\000\000\000\003\034\177\025\004\000\001"...
name = "\000/tmp/.X11-
unix/X0\000l/stdout\000nadiserver.socket\000\071\000ec\000ocket\000\021@\000\000\000\000\000\377\377\377\377\000\000\000\000\b\321\377\377\377\177\000\000p\205\201\367\377\177\000\000Д\373\367\377\177\000\000\330|
\335\367\377\177\000\000\226\226\204\367\377\177\000\000\370\n@\000\000\000\000\000\070\254a\000\000\000\000"
newformat = 0
cnt = 734
list = <optimized out>
#7 0x0000000000403295 in main (argc=<optimized out>, argv=0x7fffffffd378) at
ss.c:3921
saw_states = <optimized out>
saw_query = 0
do_summary = <optimized out>
dump_tcpdiag = 0x0
filter_fp = 0x0
ch = <optimized out>
state_filter = 2871
(gdb)
git bisect shows bad commit ec4d0d8 (ss: Replace unixstat struct by new
sockstat struct)
This is with a 4.1.2 kernel. Strange thing is, that this segfault does not
happen on my distro kernel (also v4.1) (openSUSE). Seems to be some random
stuff or kernel config problem maybe.
Marc
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