** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => In Progress
** Changed in: linux (Ubuntu Focal)
Assignee: (unassigned) => Thadeu Lima de Souza Cascardo (cascardo)
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Triaged
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https://bugs.launchpad.net/bugs/1888507
Title:
[UBUNTU 18.04] BPF programs fail on Ubuntu s390x
Status in Ubuntu on IBM z Systems:
In Progress
Status in linux package in Ubuntu:
New
Status in linux source package in Bionic:
Triaged
Status in linux source package in Focal:
In Progress
Bug description:
We need to run BPF filters to analyse and monitor network traffic. The
BPF filters are created by skydive (http://skydive.network). Currently
skydive fails to install BPF filters on s390x (using Ubuntu 18.04
currently, soon moving to Ubuntu 20.04).
Because of these failures, we decided to try the BPF samples that come
with the kernel first. These samples also fail on s390x while they
work fine on Intel.
shense@boe-build:~/bionic/samples/bpf$ uname -a
Linux boe-build 4.15.0-112-generic #113-Ubuntu SMP Thu Jul 9 23:40:36 UTC
2020 s390x s390x s390x GNU/Linux
Example instructions:
sudo apt install -y dpkg-dev clang llvm libelf-dev
sudo apt-get source linux-image-unsigned-$(uname -r)
cd linux-4.15.0/
make headers_install
make samples/bpf/
Errors:
shense@boe-build:~/bionic/samples/bpf$ sudo ./test_map_in_map
[sudo] password for shense:
invalid relo for insn[4].code 0x85
bpf_load_program() err=22
0: (bf) r7 = r1
1: (b7) r1 = 0
2: (63) *(u32 *)(r10 -32) = r1
3: (bf) r1 = r7
4: (85) call unknown#-1
BPF_CALL uses reserved fields
0: (bf) r7 = r1
1: (b7) r1 = 0
2: (63) *(u32 *)(r10 -32) = r1
3: (bf) r1 = r7
4: (85) call unknown#-1
BPF_CALL uses reserved fields
shense@boe-build:~/bionic/samples/bpf$ sudo ./map_perf_test
invalid relo for insn[22].code 0x85
bpf_load_program() err=22
0: (bf) r7 = r1
1: (18) r1 = 0x207265743a25646e
3: (7b) *(u64 *)(r10 -16) = r1
4: (18) r1 = 0x705f616c6c6f632e
6: (7b) *(u64 *)(r10 -24) = r1
7: (18) r1 = 0x5f6c72755f686d61
9: (7b) *(u64 *)(r10 -32) = r1
10: (18) r1 = 0x7420737472657373
12: (7b) *(u64 *)(r10 -40) = r1
13: (18) r1 = 0x4661696c65642061
15: (7b) *(u64 *)(r10 -48) = r1
16: (b7) r1 = 0
17: (73) *(u8 *)(r10 -8) = r1
18: (b7) r2 = 1
19: (7b) *(u64 *)(r10 -72) = r2
20: (63) *(u32 *)(r10 -76) = r1
21: (bf) r1 = r7
22: (85) call unknown#-1
BPF_CALL uses reserved fields
0: (bf) r7 = r1
1: (18) r1 = 0x207265743a25646e
3: (7b) *(u64 *)(r10 -16) = r1
4: (18) r1 = 0x705f616c6c6f632e
6: (7b) *(u64 *)(r10 -24) = r1
7: (18) r1 = 0x5f6c72755f686d61
9: (7b) *(u64 *)(r10 -32) = r1
10: (18) r1 = 0x7420737472657373
12: (7b) *(u64 *)(r10 -40) = r1
13: (18) r1 = 0x4661696c65642061
15: (7b) *(u64 *)(r10 -48) = r1
16: (b7) r1 = 0
17: (73) *(u8 *)(r10 -8) = r1
18: (b7) r2 = 1
19: (7b) *(u64 *)(r10 -72) = r2
20: (63) *(u32 *)(r10 -76) = r1
21: (bf) r1 = r7
22: (85) call unknown#-1
BPF_CALL uses reserved fields
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