Error inserting module

[phantomcraft]

After compiling the package I try to load the module but I get an error:

$ insmod kmod/af_graft.ko
insmod: ERROR: could not insert module kmod/af_graft.ko: File exists

No error found in dmesg and "journalctl -xe", but in /var/log/kern:

Oct 15 18:22:11 localhost kernel: [ 8810.983059] NET: Registered protocol family 4
Oct 15 18:22:11 localhost kernel: [ 8810.983061] af_graft: af_graft_init: sock_register failed '-17'

My system is Debian Testing with kernel 4.16.0-1-amd64, gcc version 8.2.0.

=============================

Here is strace log:

$ strace insmod kmod/af_graft.ko
execve("/sbin/insmod", ["insmod", "kmod/af_graft.ko"], 0x7ffeb30520c8 /* 23 vars /) = 0
brk(NULL) = 0x55de07883000
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=314313, ...}) = 0
mmap(NULL, 314313, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f57bf9e2000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/liblzma.so.5", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\2200\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=154376, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f57bf9e0000
mmap(NULL, 2249360, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f57bf7ba000
mprotect(0x7f57bf7df000, 2093056, PROT_NONE) = 0
mmap(0x7f57bf9de000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x24000) = 0x7f57bf9de000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000,\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1808440, ...}) = 0
mmap(NULL, 1821408, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f57bf5fd000
mmap(0x7f57bf61f000, 1335296, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7f57bf61f000
mmap(0x7f57bf765000, 307200, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x168000) = 0x7f57bf765000
mmap(0x7f57bf7b0000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b2000) = 0x7f57bf7b0000
mmap(0x7f57bf7b6000, 15072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f57bf7b6000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\21\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=14592, ...}) = 0
mmap(NULL, 16656, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f57bf5f8000
mmap(0x7f57bf5f9000, 4096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7f57bf5f9000
mmap(0x7f57bf5fa000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f57bf5fa000
mmap(0x7f57bf5fb000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f57bf5fb000
close(3) = 0
access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300k\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=146312, ...}) = 0
mmap(NULL, 132224, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f57bf5d7000
mmap(0x7f57bf5dd000, 61440, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7f57bf5dd000
mmap(0x7f57bf5ec000, 24576, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15000) = 0x7f57bf5ec000
mmap(0x7f57bf5f2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a000) = 0x7f57bf5f2000
mmap(0x7f57bf5f4000, 13440, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f57bf5f4000
close(3) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f57bf5d5000
arch_prctl(ARCH_SET_FS, 0x7f57bf5d5b80) = 0
mprotect(0x7f57bf7b0000, 16384, PROT_READ) = 0
mprotect(0x7f57bf5f2000, 4096, PROT_READ) = 0
mprotect(0x7f57bf5fb000, 4096, PROT_READ) = 0
mprotect(0x7f57bf9de000, 4096, PROT_READ) = 0
mprotect(0x55de0602f000, 8192, PROT_READ) = 0
mprotect(0x7f57bfa56000, 4096, PROT_READ) = 0
munmap(0x7f57bf9e2000, 314313) = 0
set_tid_address(0x7f57bf5d5e50) = 18420
set_robust_list(0x7f57bf5d5e60, 24) = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7f57bf5dd630, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7f57bf5e98e0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7f57bf5dd6d0, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7f57bf5e98e0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=81921024, rlim_max=RLIM64_INFINITY}) = 0
brk(NULL) = 0x55de07883000
brk(0x55de078a4000) = 0x55de078a4000
uname({sysname="Linux", nodename="localhost", ...}) = 0
openat(AT_FDCWD, "/lib/modules/4.16.0-1-amd64/modules.softdep", O_RDONLY|O_CLOEXEC) = 3
fcntl(3, F_GETFL) = 0x8000 (flags O_RDONLY|O_LARGEFILE)
fstat(3, {st_mode=S_IFREG|0644, st_size=768, ...}) = 0
read(3, "# Soft dependencies extracted fr"..., 4096) = 768
read(3, "", 4096) = 0
close(3) = 0
openat(AT_FDCWD, "/proc/cmdline", O_RDONLY|O_CLOEXEC) = 3
read(3, "BOOT_IMAGE=/vmlinuz-4.16.0-1-amd"..., 4095) = 91
read(3, "", 4004) = 0
close(3) = 0
stat(".", {st_mode=S_IFDIR|0755, st_size=154, ...}) = 0
stat("/home/user/Store/Programs/Programs/af-graft/af-graft-master", {st_mode=S_IFDIR|0755, st_size=154, ...}) = 0
stat("/home/user/Store/Programs/Programs/af-graft/af-graft-master/kmod/af_graft.ko", {st_mode=S_IFREG|0644, st_size=671800, ...}) = 0
openat(AT_FDCWD, "/home/user/Store/Programs/Programs/af-graft/af-graft-master/kmod/af_graft.ko", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1", 6) = 6
lseek(3, 0, SEEK_SET) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=671800, ...}) = 0
mmap(NULL, 671800, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f57bf530000
finit_module(3, "", 0) = -1 EEXIST (File exists)
write(2, "insmod: ERROR: could not insert "..., 69insmod: ERROR: could not insert module kmod/af_graft.ko: File exists
) = 69
munmap(0x7f57bf530000, 671800) = 0
close(3) = 0
exit_group(1) = ?
+++ exited with 1 +++

=====================

ltrace log:

$ ltrace insmod kmod/af_graft.ko
[...]
strtok_r(0x55bc46694650, 0x55bc45102b62, 0x7ffce8d9d7a8, 256) = 0x55bc46694650
strtok_r(0, 0x55bc45102b62, 0x7ffce8d9d7a8, 0) = 0x55bc46694658
strtok_r(0, 0x55bc45104599, 0x7ffce8d9d7a8, 1) = 0x55bc46694662
strlen("libcrc32c") = 9
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
malloc(57) = 0x55bc46696080
memcpy(0x55bc466960a8, "libcrc32c\0", 10) = 0x55bc466960a8
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
__ctype_b_loc() = 0x7f14aea97b18
memcpy(0x55bc466960b2, "crc32c", 6) = 0x55bc466960b2
malloc(24) = 0x55bc466960d0
free(0x55bc46694650) =
malloc(256) = 0x55bc46694650
__uflow(0x55bc46694420, 0x55bc46694088, 0x55bc46694650, 256) = -1
free(0x55bc46694650) =
fclose(0x55bc46694420) = 0
free(0x55bc46694380) =
free(0x55bc466943b0) =
open("/proc/cmdline", 524288, 00) = 3
read(3, "BOOT_IMAGE=/vmlinuz-4.16.0-1-amd"..., 4095) = 91
read(3, "", 4004) = 0
close(3) = 0
calloc(1, 4120) = 0x55bc466960f0
get_current_dir_name(0x7ffce8d9edf5, 0x7ffce8d9edf5, 0x7ffce8d9e900, 0) = 0x55bc46694760
strlen("kmod/af_graft.ko") = 16
strlen("/home/user/Store/Programs/Progra"...) = 59
realloc(0x55bc46694760, 77) = 0x55bc46694760
memcpy(0x55bc4669479c, "kmod/af_graft.ko\0", 17) = 0x55bc4669479c
free(0) =
__xstat(1, "/home/user/Store/Programs/Progra"..., 0x7ffce8d9d890) = 0
basename("kmod/af_graft.ko") = "af_graft.ko"
strlen("af_graft") = 8
strlen("af_graft") = 8
malloc(113) = 0x55bc466947c0
memcpy(0x55bc46694828, "af_graft\0", 9) = 0x55bc46694828
strlen("af_graft") = 8
realloc(0, 128) = 0x55bc46694840
calloc(1, 56) = 0x55bc466948d0
open("/home/user/Store/Programs/Progra"..., 524288, 070) = 3
read(3, "\177ELF\002\001", 6) = 6
lseek(3, 0, 0) = 0
memcmp(0x7ffce8d9e8c0, 0x55bc45105290, 6, 0x7f14aeba8367) = 0xffffff82
__fxstat(1, 3, 0x7ffce8d9e810) = 0
mmap(0, 0xa4038, 1, 2) = 0x7f14ae9f2000
syscall(313, 3, 0x55bc45102a78, 0) = -1
__errno_location() = 0x7f14aea97b00
__errno_location() = 0x7f14aea97b00
strerror(17) = "File exists"
__vasprintf_chk(0x7ffce8d9e850, 1, 0x55bc45100e78, 0x7ffce8d9e858) = 54
__fprintf_chk(0x7f14aec77680, 1, 0x55bc45103906, 0x7ffce8d9edeeinsmod: ERROR: could not insert module kmod/af_graft.ko: File exists
) = 69
free(0x55bc46694910) =
strlen("af_graft") = 8
strcmp("af_graft", "af_graft") = 0
memmove(0x55bc46694840, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16) = 0x55bc46694840
munmap(0x7f14ae9f2000, 0xa4038, 0, 0x55bc466960f0) = 0
close(3) = 0
free(0x55bc466948d0) =
free(0) =
free(0x55bc46694760) =
free(0x55bc466947c0) =
free(0) =
free(0) =
free(0) =
free(0) =
free(0) =
free(0) =
free(0) =
free(0) =
free(0) =
free(0x55bc46694840) =
free(0) =
[...]

[upa]

Current implementation overrides AF_IPX withAF_GRAFT becuase Linux kernel prohibits dinamically adding a new address family number (please see include graft.h).

af_graft_init: sock_register failed '-17' (-EEXIST) indicates that a socket protocol family is already registered in the address family number, which is AF_IPX.

So, please modprobe -r ipx.

[phantomcraft]

It solved, thank you.

I suggest to include this detail in README.

[upa]

Yes, I added ;) thank you.