[ Cc Wang (x86_32 BPF JIT maintainer) ] On 11/8/19 4:57 PM, Stephen Hemminger wrote:
Begin forwarded message: Date: Fri, 08 Nov 2019 07:35:59 +0000 From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx To: stephen@xxxxxxxxxxxxxxxxxx Subject: [Bug 205469] New: x86_32: bpf: multiple test_bpf failures using eBPF JIT https://bugzilla.kernel.org/show_bug.cgi?id=205469 Bug ID: 205469 Summary: x86_32: bpf: multiple test_bpf failures using eBPF JIT Product: Networking Version: 2.5 Kernel Version: 4.19.81 LTS Hardware: i386 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other Assignee: stephen@xxxxxxxxxxxxxxxxxx Reporter: itugrok@xxxxxxxxx CC: itugrok@xxxxxxxxx Regression: No Created attachment 285829 --> https://bugzilla.kernel.org/attachment.cgi?id=285829&action=edit test_bpf failures: kernel 4.19.81/x86_32 (OpenWrt) Summary: ======== Running the 4.19.81 LTS kernel on QEMU/x86_32, the standard test_bpf.ko testsuite generates multiple errors with the eBPF JIT enabled: ... test_bpf: #32 JSET jited:1 40 ret 0 != 20 46 FAIL test_bpf: #321 LD_IND word positive offset jited:1 ret 0 != -291897430 FAIL test_bpf: #322 LD_IND word negative offset jited:1 ret 0 != -1437222042 FAIL test_bpf: #323 LD_IND word unaligned (addr & 3 == 2) jited:1 ret 0 != -1150890889 FAIL test_bpf: #326 LD_IND word positive offset, all ff jited:1 ret 0 != -1 FAIL ... test_bpf: Summary: 373 PASSED, 5 FAILED, [344/366 JIT'ed] However, with eBPF JIT disabled (net.core.bpf_jit_enable=0) all tests pass. Steps to Reproduce: =================== # sysctl net.core.bpf_jit_enable=1 # modprobe test_bpf <Kernel log with failures and test summary> Affected Systems Tested: ======================== OpenWrt master on QEMU/pc-q35(x86_32) [LTS kernel 4.19.81] Kernel Logs: ============ Boot log with test results is attached.
