Re: [LARTC] how to debug RTNETLINK invalid argument?

[George Nychis <gnychis@cmu.edu>]

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Luciano Ruete wrote:
> El Tuesday 23 May 2006 13:17, George Nychis escribió:
>> Hey,
>>
>> I am getting an invalid argument trying to insert a qdisc:
>>
>> [root@emu-5 iproute2]# tc qdisc add dev eth0 root xcp capacity 50Mbit
>> limit 500
>> RTNETLINK answers: Invalid argument
>>
>> I'm not sure whats wrong here, because i can successfully insert this
>> qdisc on other computers of mine.
>>
>> How can i debug this?
> 
> maybe strace (system calls and signals trace) can give you some clues.
> 
> strace tc qdisc add dev eth0 root xcp capacity 50Mbit limit 500
> 

Heres what I get as the output:

execve("/sbin/tc", ["tc", "qdisc", "add", "dev", "eth0", "root", "xcp",
"capacity", "50Mbit", "limit", "500"], [/* 22 vars */]) = 0
uname({sys="Linux", node="emu-5", ...}) = 0
set_tid_address(0)                      = -1 ENOSYS (Function not
implemented)
brk(0)                                  = 0x80705cc
brk(0x8071000)                          = 0x8071000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or
directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_sizec789, ...}) = 0
old_mmap(NULL, 63789, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40000000
close(3)                                = 0
open("/lib/libresolv.so.2", O_RDONLY)   = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\360\223"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size316, ...}) = 0
old_mmap(0x4e2d7000, 80040, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x4e2d7000
mprotect(0x4e2e6000, 18600, PROT_NONE)  = 0
old_mmap(0x4e2e7000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xf000) = 0x4e2e7000
old_mmap(0x4e2e9000, 6312, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4e2e9000
close(3)                                = 0
open("/lib/i686/libm.so.6", O_RDONLY)   = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0\263G"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size!5248, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0x40010000
old_mmap(0x44478000, 139424, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x44478000
old_mmap(0x44499000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x20000) = 0x44499000
close(3)                                = 0
open("/lib/libdl.so.2", O_RDONLY)       = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260\333"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size\x16908, ...}) = 0
old_mmap(0x473fd000, 12388, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x473fd000
old_mmap(0x473ff000, 8192, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x473ff000
close(3)                                = 0
open("/lib/i686/libc.so.6", O_RDONLY)   = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0p36D4\0"...,
512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size\x1499368, ...}) = 0
old_mmap(0x4434e000, 1211684, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x4434e000
mprotect(0x4446f000, 27940, PROT_NONE)  = 0
old_mmap(0x44470000, 16384, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x121000) = 0x44470000
old_mmap(0x44474000, 7460, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x44474000
close(3)                                = 0
mprotect(0x44470000, 8192, PROT_READ)   = 0
mprotect(0x473ff000, 4096, PROT_READ)   = 0
mprotect(0x44499000, 4096, PROT_READ)   = 0
mprotect(0x4e2e7000, 4096, PROT_READ)   = 0
mprotect(0xb8b000, 4096, PROT_READ)     = 0
munmap(0x40000000, 63789)               = 0
brk(0)                                  = 0x8071000
brk(0x8092000)                          = 0x8092000
open("/proc/net/psched", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x40000000
read(3, "000c8000 000f4240 000f4240 00000"..., 4096) = 36
close(3)                                = 0
munmap(0x40000000, 4096)                = 0
socket(PF_NETLINK, SOCK_RAW, 0)         = 3
setsockopt(3, SOL_SOCKET, SO_SNDBUF, [32768], 4) = 0
setsockopt(3, SOL_SOCKET, SO_RCVBUF, [32768], 4) = 0
bind(3, {sa_family¯_NETLINK, pid=0, groups\0000000}, 12) = 0
getsockname(3, {sa_family¯_NETLINK, pidT07, groups\0000000}, [12]) = 0
time(NULL)                              = 1148447549
open("/usr/lib/tc/q_xcp.so", O_RDONLY)  = 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\270\5\0"...,
512) = 512
fstat64(4, {st_mode=S_IFREG|0755, st_sizeA92, ...}) = 0
old_mmap(NULL, 6908, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4,
0) = 0x40000000
old_mmap(0x40001000, 4096, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 4, 0) = 0x40001000
close(4)                                = 0
sendto(3, "\24\0\0\0\22\0\1\3>\353sD\0\0\0\0\0\0\0\0", 20, 0,
{sa_family¯_NETLINK, pid=0, groups\0000000}, 12) = 20
recvmsg(3, {msg_name(12)={sa_family¯_NETLINK, pid=0, groups\0000000},
msg_iov(1)=[{"\264\0\0\0\20\0\2\0>\353sD\37\25\0\0\0\0\4\3\1\0\0\0I\0"...,
16384}], msg_controllen=0, msg_flags=0}, 0) = 920
recvmsg(3, {msg_name(12)={sa_family¯_NETLINK, pid=0, groups\0000000},
msg_iov(1)=[{"\24\0\0\0\3\0\2\0>\353sD\37\25\0\0\0\0\0\0\1\0\0\0I\0\0"...,
16384}], msg_controllen=0, msg_flags=0}, 0) = 20

sendmsg(3, {msg_name(12)={sa_family¯_NETLINK, pid=0, groups\0000000},
msg_iov(1)=[{"8\0\0\0$\0\5\6?\353sD\0\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0\377"...,
56}], msg_controllen=0, msg_flags=0}, 0) = 56
recvmsg(3, {msg_name(12)={sa_family¯_NETLINK, pid=0, groups\0000000},
msg_iov(1)=[{"$\0\0\0\2\0\0\0?\353sD\37\25\0\0\352\377\377\3778\0\0\0"...,
16384}], msg_controllen=0, msg_flags=0}, 0) = 36
dup(2)                                  = 4
fcntl64(4, F_GETFL)                     = 0x8001 (flags
O_WRONLY|O_LARGEFILE)
close(4)                                = 0
write(2, "RTNETLINK answers: Invalid argum"..., 36RTNETLINK answers:
Invalid argument
) = 36
close(3)                                = 0
exit_group(2)                           = ?
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