Messages in this thread | | | From | "Li, Xin3" <> | Subject | RE: [linus:master] [x86/vdso] 877cff5296: kernel-selftests.x86.test_vsyscall_32.fail | Date | Sat, 11 Mar 2023 08:51:21 +0000 |
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> FYI, we noticed kernel-selftests.x86.test_vsyscall_32.fail due to commit (built with > gcc-11): > > commit: 877cff5296faa6ef312f8002216bbf73bea006c7 ("x86/vdso: Fake 32bit > VDSO build on 64bit compile for vgetcpu") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > [test failed on linux-next/master 1716a175592aff9549a0c07aac8f9cadd03003f5] > > in testcase: kernel-selftests > version: kernel-selftests-x86_64-d4cf28ee-1_20230110 > with following parameters: > > group: x86 > > test-description: The kernel contains a set of "self tests" under the > tools/testing/selftests/ directory. These are intended to be small unit tests to > exercise individual code paths in the kernel. > test-url: https://www.kernel.org/doc/Documentation/kselftest.txt > > on test machine: 8 threads 1 sockets Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz > (Kaby Lake) with 32G memory > > caused below changes (please refer to attached dmesg/kmsg for entire > log/backtrace): > > > # selftests: x86: test_vsyscall_32 > # [RUN] test gettimeofday() > # vDSO time offsets: 0.000017 0.000001 > # [OK] vDSO gettimeofday()'s timeval was okay > # [RUN] test time() > # [OK] vDSO time() is okay > # [RUN] getcpu() on CPU 0 > # [FAIL] vDSO reported CPU 227 but should be 0 > # [OK] vDSO reported correct node > # [RUN] getcpu() on CPU 1 > # [FAIL] vDSO reported CPU 227 but should be 1 > # [OK] vDSO reported correct node > not ok 9 selftests: x86: test_vsyscall_32 # exit=1 > > > If you fix the issue, kindly add following tag > | Reported-by: kernel test robot <yujie.liu@intel.com> > | Link: > | https://lore.kernel.org/oe-lkp/202303020903.b01fd1de-yujie.liu@intel.com
Shan Kang found the same issue when she was testing the v5 FRED patch set. The root cause is the 32-bit getcpu() on 64-bit Linux kernel is compiled with 32-bit Linux kernel GDT_ENTRY_CPUNODE, i.e., 28, beyond the 64-bit Linux kernel GDT limit.
I will send a fix soon.
Thanks! Xin
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