Hello, I'm seeking your help with an issue reported by BPF CI tests on a core BPF patch I provided to improve security in link with https://github.com/KSPP/linux/issues/7 I submitted patch https://patchwork.kernel.org/project/netdevbpf/patch/135feeafe6fe8d412e90865622e9601403c42be5.1708253445.git.christophe.leroy@xxxxxxxxxx/ As you can see in the checks list, I get "bpf/vmtest-bpf-next-VM_Test-14 fail Logs for s390x-gcc / test (test_progs, false, 360) / test_progs on s390x with gcc " The output is the one below. Could you help me understand and fix the issue on S390 ? Thanks Christophe Output: ... #262 reg_bounds_rand_ranges_u64_u64:OK #263 resolve_btfids:OK Caught signal #11! Stack trace: ./test_progs(crash_handler+0x40)[0x2aa090c5ca8] linux-vdso64.so.1(__kernel_sigreturn+0x0)[0x3ffc78ce488] ./test_progs(ring_buffer__poll+0xc6)[0x2aa0912bbe6] ./test_progs(+0x283490)[0x2aa08f83490] /lib/s390x-linux-gnu/libpthread.so.0(+0x7e66)[0x3ffb8c07e66] /lib/s390x-linux-gnu/libc.so.6(+0xfcd46)[0x3ffb8afcd46] [0x0] test_progs[116] is installing a program with bpf_probe_write_user helper that may corrupt user memory! User process fault: interruption code 003b ilc:2 in test_progs[2aa08d00000+b1f000] Failing address: 0000000000000000 TEID: 0000000000000800 Fault in primary space mode while using user ASCE. AS:0000000081b381cf R1:0000000081b2c00f R2:0000000081bf400b R3:0000000000000024 CPU: 0 PID: 804 Comm: new_name Tainted: G OE 6.8.0-rc1-g690b912d8bb7-dirty #215 Hardware name: IBM 8561 LT1 400 (KVM/Linux) User PSW : 0705000180000000 000002aa0912bbe6 R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:1 AS:0 CC:0 PM:0 RI:0 EA:3 User GPRS: 0000000000000000 0000000000000000 0000000000000000 000002aa0dbcf5c0 ffffffff00000000 0000000000002710 000003ffb6d00900 000003ffc7877ad7 000003ffb6d001e0 000003ffc7877ad6 000003ffc7877ad8 000003ffb6cffe50 000003ffb8e26f88 000003ffb6d00900 000002aa0912bb88 000003ffb6cffe50 User Code: 000002aa0912bbd6: e310b0b40014 lgf %r1,180(%r11) 000002aa0912bbdc: eb110004000d sllg %r1,%r1,4 #000002aa0912bbe2: b9080012 agr %r1,%r2 >000002aa0912bbe6: 58101008 l %r1,8(%r1) 000002aa0912bbea: 5010b0bc st %r1,188(%r11) 000002aa0912bbee: e310b0a80004 lg %r1,168(%r11) 000002aa0912bbf4: e32010080004 lg %r2,8(%r1) 000002aa0912bbfa: e310b0bc0016 llgf %r1,188(%r11) Last Breaking-Event-Address: [<0000000000000001>] test_progs[2aa08d00000+b1f000] ./ci/vmtest/vmtest_selftests.sh: line 69: 116 Segmentation fault ./${selftest} ${args} ${DENYLIST:+-d"$DENYLIST"} ${ALLOWLIST:+-a"$ALLOWLIST"} --json-summary "${json_file}" bash: line 5: cd: /tmp/work/bpf/bpf: No such file or directory
