Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1)

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* Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1)
       [not found] <CAP-VjpyJxPNJ0438FbxEWxNbyL7zsCFwrEt6Tzw-vHz0ZQHxmg@mail.gmail.com>
@ 2022-09-28 18:30 ` Owayss Kabtoul
  2022-09-30  2:11   ` John Fastabend
  0 siblings, 1 reply; 4+ messages in thread
From: Owayss Kabtoul @ 2022-09-28 18:30 UTC (permalink / raw)
  To: bpf

Hello.

I have built libbpf from source (a7c0f7e). When running any of the
provided examples, the bpf syscall fails with "Invalid argument":

```
$ sudo strace ./minimal
[sudo] password for owayss:
execve("./minimal", ["./minimal"], 0xffffff88af60 /* 27 vars */) = 0
brk(NULL)                               = 0xaaab19c54000
faccessat(AT_FDCWD, "/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
newfstatat(3, "", {st_mode=S_IFREG|0644, st_size=181223, ...},
AT_EMPTY_PATH) = 0
mmap(NULL, 181223, PROT_READ, MAP_PRIVATE, 3, 0) = 0xffff03d24000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"...,
832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=592248, ...},
AT_EMPTY_PATH) = 0
mmap(NULL, 721128, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff03c70000
mmap(0xffff03c70000, 655592, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0xffff03c70000
munmap(0xffff03d14000, 49384)           = 0
mprotect(0xffff03d00000, 49152, PROT_NONE) = 0
mmap(0xffff03d0c000, 32768, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8c000) = 0xffff03d0c000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libelf.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"...,
832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=108656, ...},
AT_EMPTY_PATH) = 0
mmap(NULL, 237592, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff03c34000
mmap(0xffff03c40000, 172056, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0xffff03c40000
munmap(0xffff03c34000, 49152)           = 0
munmap(0xffff03c6c000, 8216)            = 0
mprotect(0xffff03c5c000, 49152, PROT_NONE) = 0
mmap(0xffff03c68000, 16384, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x18000) = 0xffff03c68000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/libz.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0\267\0\1\0\0\0\0\0\0\0\0\0\0\0"...,
832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=92048, ...}, AT_EMPTY_PATH) = 0
mmap(NULL, 221200, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xffff03c08000
mmap(0xffff03c10000, 155664, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0xffff03c10000
munmap(0xffff03c08000, 32768)           = 0
munmap(0xffff03c38000, 24592)           = 0
mprotect(0xffff03c28000, 49152, PROT_NONE) = 0
mmap(0xffff03c34000, 16384, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x14000) = 0xffff03c34000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/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\267\0\1\0\0\0p}\2\0\0\0\0\0"...,
832) = 832
newfstatat(3, "", {st_mode=S_IFREG|0755, st_size=1673696, ...},
AT_EMPTY_PATH) = 0
mmap(NULL, 1842496, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xffff03a4c000
mmap(0xffff03a50000, 1776960, PROT_READ|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0) = 0xffff03a50000
munmap(0xffff03a4c000, 16384)           = 0
munmap(0xffff03c04000, 40256)           = 0
mprotect(0xffff03be0000, 65536, PROT_NONE) = 0
mmap(0xffff03bf0000, 32768, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x190000) = 0xffff03bf0000
mmap(0xffff03bf8000, 40256, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xffff03bf8000
close(3)                                = 0
mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xffff03d1c000
set_tid_address(0xffff03d1c510)         = 21560
set_robust_list(0xffff03d1c520, 24)     = 0
rseq(0xffff03d1cbe0, 0x20, 0, 0xd428bc00) = 0
mprotect(0xffff03bf0000, 16384, PROT_READ) = 0
mprotect(0xffff03d0c000, 16384, PROT_READ) = 0
mprotect(0xffff03d8c000, 16384, PROT_READ) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024,
rlim_max=RLIM64_INFINITY}) = 0
munmap(0xffff03d24000, 181223)          = 0
getrandom("\x9e\xc7\x11\xbd\x76\x65\x6b\x8b", 8, GRND_NONBLOCK) = 8
brk(NULL)                               = 0xaaab19c54000
brk(0xaaab19c78000)                     = 0xaaab19c78000
write(2, "libbpf: loading object 'minimal_"..., 49libbpf: loading
object 'minimal_bpf' from buffer
) = 49
faccessat(AT_FDCWD, "/proc/version_signature", R_OK) = -1 ENOENT (No
such file or directory)
uname({sysname="Linux", nodename="owayss-mac", ...}) = 0
write(2, "libbpf: elf: section(3) tp/sysca"..., 87libbpf: elf:
section(3) tp/syscalls/sys_enter_write, size 104, link 0, flags 6,
type=1
) = 87
write(2, "libbpf: sec 'tp/syscalls/sys_ent"..., 128libbpf: sec
'tp/syscalls/sys_enter_write': found program 'handle_tp' at insn
offset 0 (0 bytes), code size 13 insns (104 bytes)
) = 128
write(2, "libbpf: elf: section(4) .reltp/s"..., 92libbpf: elf:
section(4) .reltp/syscalls/sys_enter_write, size 32, link 13, flags
40, type=9
) = 92
write(2, "libbpf: elf: section(5) license,"..., 66libbpf: elf:
section(5) license, size 13, link 0, flags 3, type=1
) = 66
write(2, "libbpf: license of minimal_bpf i"..., 47libbpf: license of
minimal_bpf is Dual BSD/GPL
) = 47
write(2, "libbpf: elf: section(6) .bss, si"..., 62libbpf: elf:
section(6) .bss, size 4, link 0, flags 3, type=8
) = 62
write(2, "libbpf: elf: section(7) .rodata,"..., 66libbpf: elf:
section(7) .rodata, size 28, link 0, flags 2, type=1
) = 66
write(2, "libbpf: elf: section(8) .BTF, si"..., 64libbpf: elf:
section(8) .BTF, size 601, link 0, flags 0, type=1
) = 64
write(2, "libbpf: elf: section(10) .BTF.ex"..., 69libbpf: elf:
section(10) .BTF.ext, size 160, link 0, flags 0, type=1
) = 69
write(2, "libbpf: elf: section(13) .symtab"..., 68libbpf: elf:
section(13) .symtab, size 192, link 1, flags 0, type=2
) = 68
write(2, "libbpf: looking for externs amon"..., 47libbpf: looking for
externs among 8 symbols...
) = 47
write(2, "libbpf: collected 0 externs tota"..., 34libbpf: collected 0
externs total
) = 34
write(2, "libbpf: map 'minimal_.bss' (glob"..., 77libbpf: map
'minimal_.bss' (global data): at sec_idx 6, offset 0, flags 400.
) = 77
mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1,
0) = 0xffff03d50000
write(2, "libbpf: map 0 is \"minimal_.bss\"\n", 32libbpf: map 0 is
"minimal_.bss"
) = 32
write(2, "libbpf: map 'minimal_.rodata' (g"..., 80libbpf: map
'minimal_.rodata' (global data): at sec_idx 7, offset 0, flags 480.
) = 80
mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1,
0) = 0xffff03d4c000
write(2, "libbpf: map 1 is \"minimal_.rodat"..., 35libbpf: map 1 is
"minimal_.rodata"
) = 35
write(2, "libbpf: sec '.reltp/syscalls/sys"..., 114libbpf: sec
'.reltp/syscalls/sys_enter_write': collecting relocation for
section(3) 'tp/syscalls/sys_enter_write'
) = 114
write(2, "libbpf: sec '.reltp/syscalls/sys"..., 81libbpf: sec
'.reltp/syscalls/sys_enter_write': relo #0: insn #2 against 'my_pid'
) = 81
write(2, "libbpf: prog 'handle_tp': found "..., 83libbpf: prog
'handle_tp': found data map 0 (minimal_.bss, sec 6, off 0) for insn 2
) = 83
write(2, "libbpf: sec '.reltp/syscalls/sys"..., 82libbpf: sec
'.reltp/syscalls/sys_enter_write': relo #1: insn #6 against '.rodata'
) = 82
write(2, "libbpf: prog 'handle_tp': found "..., 86libbpf: prog
'handle_tp': found data map 1 (minimal_.rodata, sec 7, off 0) for insn
6
) = 86
getpid()                                = 21560
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SOCKET_FILTER, insn_cnt=2,
insns=0xffffdfa76b78, license="GPL", log_level=0, log_size=0,
log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0,
prog_name="", prog_ifindex=0,
expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=0,
func_info_rec_size=0, func_info=NULL, func_info_cnt=0,
line_info_rec_size=0, line_info=NULL, line_info_cnt=0,
attach_btf_id=0, attach_prog_fd=0}, 116) = 3
close(3)                                = 0
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SOCKET_FILTER, insn_cnt=2,
insns=0xffffdfa76df8, license="GPL", log_level=0, log_size=0,
log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0,
prog_name="", prog_ifindex=0,
expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=0,
func_info_rec_size=0, func_info=NULL, func_info_cnt=0,
line_info_rec_size=0, line_info=NULL, line_info_cnt=0,
attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = 3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0\20\0\0\0\20\0\0\0\5\0\0\0\1\0\0\0\0\0\0\1"...,
btf_log_buf=NULL, btf_size=45, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0000\0\0\0000\0\0\0\t\0\0\0\1\0\0\0\0\0\0\1"...,
btf_log_buf=NULL, btf_size=81, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\08\0\0\08\0\0\0\t\0\0\0\0\0\0\0\0\0\0\1"...,
btf_log_buf=NULL, btf_size=89, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0\f\0\0\0\f\0\0\0\7\0\0\0\1\0\0\0\0\0\0\20"...,
btf_log_buf=NULL, btf_size=43, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0000\0\0\0000\0\0\0\t\0\0\0\1\0\0\0\0\0\0\1"...,
btf_log_buf=NULL, btf_size=81, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0000\0\0\0000\0\0\0\5\0\0\0\0\0\0\0\0\0\0\1"...,
btf_log_buf=NULL, btf_size=77, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0(\0\0\0(\0\0\0\5\0\0\0\0\0\0\0\0\0\0\1"...,
btf_log_buf=NULL, btf_size=69, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0\f\0\0\0\f\0\0\0\10\0\0\0\1\0\0\0\0\0\0\23"...,
btf_log_buf=NULL, btf_size=44, btf_log_size=0, btf_log_level=0}, 28) =
3
close(3)                                = 0
bpf(BPF_BTF_LOAD,
{btf="\237\353\1\0\30\0\0\0\0\0\0\0\20\1\0\0\20\1\0\0001\1\0\0\0\0\0\0\0\0\0\2"...,
btf_log_buf=NULL, btf_size=601, btf_log_size=0, btf_log_level=0}, 28)
= 3
bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_ARRAY, key_size=4,
value_size=4, max_entries=1, map_flags=BPF_F_MMAPABLE, inner_map_fd=0,
map_name="", map_ifindex=0, btf_fd=0, btf_key_type_id=0,
btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) =
4
close(4)                                = 0
bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_ARRAY, key_size=4,
value_size=32, max_entries=1, map_flags=0, inner_map_fd=0,
map_name="", map_ifindex=0, btf_fd=0, btf_key_type_id=0,
btf_value_type_id=0, btf_vmlinux_value_type_id=0, map_extra=0}, 72) =
4
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SOCKET_FILTER, insn_cnt=5,
insns=0xffffdfa76a60, license="GPL", log_level=0, log_size=0,
log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0,
prog_name="", prog_ifindex=0,
expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=0,
func_info_rec_size=0, func_info=NULL, func_info_cnt=0,
line_info_rec_size=0, line_info=NULL, line_info_cnt=0,
attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = 5
close(4)                                = 0
close(5)                                = 0
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_SOCKET_FILTER, insn_cnt=2,
insns=0xffffdfa769b8, license="GPL", log_level=0, log_size=0,
log_buf=NULL, kern_version=KERNEL_VERSION(0, 0, 0), prog_flags=0,
prog_name="test", prog_ifindex=0,
expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=0,
func_info_rec_size=0, func_info=NULL, func_info_cnt=0,
line_info_rec_size=0, line_info=NULL, line_info_cnt=0,
attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = 4
close(4)                                = 0
bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_ARRAY, key_size=4,
value_size=4, max_entries=1, map_flags=BPF_F_MMAPABLE, inner_map_fd=0,
map_name="minimal_.bss", map_ifindex=0, btf_fd=3, btf_key_type_id=0,
btf_value_type_id=13, btf_vmlinux_value_type_id=0, map_extra=0}, 72) =
4
write(2, "libbpf: map 'minimal_.bss': crea"..., 55libbpf: map
'minimal_.bss': created successfully, fd=4
) = 55
bpf(BPF_MAP_UPDATE_ELEM, {map_fd=4, key=0xffffdfa76bbc,
value=0xffff03d50000, flags=BPF_ANY}, 144) = 0
bpf(BPF_MAP_CREATE, {map_type=BPF_MAP_TYPE_ARRAY, key_size=4,
value_size=28, max_entries=1,
map_flags=BPF_F_RDONLY_PROG|BPF_F_MMAPABLE, inner_map_fd=0,
map_name="minimal_.rodata", map_ifindex=0, btf_fd=3,
btf_key_type_id=0, btf_value_type_id=14, btf_vmlinux_value_type_id=0,
map_extra=0}, 72) = 5
write(2, "libbpf: map 'minimal_.rodata': c"..., 58libbpf: map
'minimal_.rodata': created successfully, fd=5
) = 58
bpf(BPF_MAP_UPDATE_ELEM, {map_fd=5, key=0xffffdfa76bbc,
value=0xffff03d4c000, flags=BPF_ANY}, 144) = 0
bpf(BPF_MAP_FREEZE, {map_fd=5}, 144)    = 0
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_TRACEPOINT, insn_cnt=13,
insns=0xaaab19c55440, license="Dual BSD/GPL", log_level=0, log_size=0,
log_buf=NULL, kern_version=KERNEL_VERSION(6, 0, 0), prog_flags=0,
prog_name="handle_tp", prog_ifindex=0,
expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=3,
func_info_rec_size=8, func_info=0xaaab19c546b0, func_info_cnt=1,
line_info_rec_size=16, line_info=0xaaab19c545f0, line_info_cnt=6,
attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EINVAL
(Invalid argument)
mmap(NULL, 16793600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0) = 0xffff02a4c000
bpf(BPF_PROG_LOAD, {prog_type=BPF_PROG_TYPE_TRACEPOINT, insn_cnt=13,
insns=0xaaab19c55440, license="Dual BSD/GPL", log_level=1,
log_size=16777215, log_buf="", kern_version=KERNEL_VERSION(6, 0, 0),
prog_flags=0, prog_name="handle_tp", prog_ifindex=0,
expected_attach_type=BPF_CGROUP_INET_INGRESS, prog_btf_fd=3,
func_info_rec_size=8, func_info=0xaaab19c546b0, func_info_cnt=1,
line_info_rec_size=16, line_info=0xaaab19c545f0, line_info_cnt=6,
attach_btf_id=0, attach_prog_fd=0, fd_array=NULL}, 144) = -1 EINVAL
(Invalid argument)
write(2, "libbpf: prog 'handle_tp': BPF pr"..., 68libbpf: prog
'handle_tp': BPF program load failed: Invalid argument
) = 68
munmap(0xffff02a4c000, 16793600)        = 0
write(2, "libbpf: prog 'handle_tp': failed"..., 46libbpf: prog
'handle_tp': failed to load: -22
) = 46
close(4)                                = 0
close(5)                                = 0
write(2, "libbpf: failed to load object 'm"..., 44libbpf: failed to
load object 'minimal_bpf'
) = 44
write(2, "libbpf: failed to load BPF skele"..., 55libbpf: failed to
load BPF skeleton 'minimal_bpf': -22
) = 55
write(2, "Failed to load and verify BPF sk"..., 39Failed to load and
verify BPF skeleton
) = 39
close(3)                                = 0
munmap(0xffff03d50000, 16384)           = 0
munmap(0xffff03d4c000, 16384)           = 0
exit_group(22)                          = ?
+++ exited with 22 +++

```

My relevant Kernel configuration is:

```
$ cat /proc/config.gz | gunzip | grep -i bpf
CONFIG_BPF=y
CONFIG_HAVE_EBPF_JIT=y
CONFIG_ARCH_WANT_DEFAULT_BPF_JIT=y
# BPF subsystem
CONFIG_BPF_SYSCALL=y
CONFIG_BPF_JIT=y
# CONFIG_BPF_JIT_ALWAYS_ON is not set
CONFIG_BPF_JIT_DEFAULT_ON=y
# CONFIG_BPF_UNPRIV_DEFAULT_OFF is not set
# CONFIG_BPF_PRELOAD is not set
# end of BPF subsystem
CONFIG_CGROUP_BPF=y
CONFIG_IPV6_SEG6_BPF=y
CONFIG_NETFILTER_XT_MATCH_BPF=m
CONFIG_BPFILTER=y
CONFIG_BPFILTER_UMH=m
CONFIG_NET_CLS_BPF=y
CONFIG_NET_ACT_BPF=m
CONFIG_BPF_STREAM_PARSER=y
CONFIG_LWTUNNEL_BPF=y
CONFIG_BPF_LIRC_MODE2=y
```

That is running on a:
```
$ uname -r
6.0.0-rc6-asahi-1-1-ARCH

$ uname -m
aarch64
```


Any pointers on where to look for what might cause this issue?

Owayss.

^ permalink raw reply	[flat|nested] 4+ messages in thread

* RE: Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1)
  2022-09-28 18:30 ` Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1) Owayss Kabtoul
@ 2022-09-30  2:11   ` John Fastabend
  2022-09-30  7:53     ` Owayss Kabtoul
  0 siblings, 1 reply; 4+ messages in thread
From: John Fastabend @ 2022-09-30  2:11 UTC (permalink / raw)
  To: Owayss Kabtoul, bpf

Owayss Kabtoul wrote:
> Hello.
> 
> I have built libbpf from source (a7c0f7e). When running any of the
> provided examples, the bpf syscall fails with "Invalid argument":
> 
> ```
> $ sudo strace ./minimal

Could you post the minimal C code. Its likely easier to read than
trying to parse the strace output. Sure we could probably figure
it out from strace but lets go the easier route.

Caveat I didn't bother to try and read the strace.

Thanks,
John

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1)
  2022-09-30  2:11   ` John Fastabend
@ 2022-09-30  7:53     ` Owayss Kabtoul
  2022-09-30 22:14       ` Andrii Nakryiko
  0 siblings, 1 reply; 4+ messages in thread
From: Owayss Kabtoul @ 2022-09-30  7:53 UTC (permalink / raw)
  To: John Fastabend; +Cc: bpf

Hello John.

The "minimal" program in question is the one from:
https://github.com/libbpf/libbpf-bootstrap/blob/bc186797086bee39769e3f24bcccf292a94cdcb7/examples/c/minimal.c


On Fri, Sep 30, 2022 at 4:11 AM John Fastabend <john.fastabend@gmail.com> wrote:
>
> Owayss Kabtoul wrote:
> > Hello.
> >
> > I have built libbpf from source (a7c0f7e). When running any of the
> > provided examples, the bpf syscall fails with "Invalid argument":
> >
> > ```
> > $ sudo strace ./minimal
>
> Could you post the minimal C code. Its likely easier to read than
> trying to parse the strace output. Sure we could probably figure
> it out from strace but lets go the easier route.
>
> Caveat I didn't bother to try and read the strace.
>
> Thanks,
> John

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1)
  2022-09-30  7:53     ` Owayss Kabtoul
@ 2022-09-30 22:14       ` Andrii Nakryiko
  0 siblings, 0 replies; 4+ messages in thread
From: Andrii Nakryiko @ 2022-09-30 22:14 UTC (permalink / raw)
  To: Owayss Kabtoul; +Cc: John Fastabend, bpf

On Fri, Sep 30, 2022 at 1:01 AM Owayss Kabtoul <owayssk@gmail.com> wrote:
>
> Hello John.
>
> The "minimal" program in question is the one from:
> https://github.com/libbpf/libbpf-bootstrap/blob/bc186797086bee39769e3f24bcccf292a94cdcb7/examples/c/minimal.c
>

Please don't top-post in kernel mailing lists, reply inline instead.

>
> On Fri, Sep 30, 2022 at 4:11 AM John Fastabend <john.fastabend@gmail.com> wrote:
> >
> > Owayss Kabtoul wrote:
> > > Hello.
> > >
> > > I have built libbpf from source (a7c0f7e). When running any of the
> > > provided examples, the bpf syscall fails with "Invalid argument":
> > >
> > > ```
> > > $ sudo strace ./minimal
> >
> > Could you post the minimal C code. Its likely easier to read than
> > trying to parse the strace output. Sure we could probably figure
> > it out from strace but lets go the easier route.
> >
> > Caveat I didn't bother to try and read the strace.
> >

:) I did bother a bit, it looks like maps are created, and trivial
SOCKET_FILTER prog is created successfully as well. So BPF is at least
minimally enabled.

But do check CONFIG_BPF_EVENTS=y in your kernel config, it seems to be
the requirement for bpf_trace_printk() BPF helper used from
bpf_printk() macro.


> > Thanks,
> > John

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2022-09-30 22:15 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2022-09-28 18:30 ` Fwd: bpf syscall failing on aarch64 with "Invalid argument" (Asahi Linux on M1) Owayss Kabtoul
2022-09-30  2:11   ` John Fastabend
2022-09-30  7:53     ` Owayss Kabtoul
2022-09-30 22:14       ` Andrii Nakryiko

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