Messages in this thread | | | Date | Fri, 6 Jan 2023 14:53:11 +0100 | Subject | Re: BUG: core dump in selftest of proc fs | From | Mirsad Goran Todorovac <> |
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On 06. 01. 2023. 11:39, Alexey Dobriyan wrote: > On Wed, Jan 04, 2023 at 07:27:40PM +0100, Mirsad Goran Todorovac wrote: >> Dear all, >> >> Trying to complete `make kselftest` for the first time, so maybe I'm doing something wrong? >> >> Or we are having a regression in 6.2-rc2 release candidate ... >> >> However, the output of selftest run is: >> >> make[2]: Entering directory '.../linux_torvalds/tools/testing/selftests/proc' >> TAP version 13 >> 1..21 >> # selftests: proc: fd-001-lookup >> ok 1 selftests: proc: fd-001-lookup >> # selftests: proc: fd-002-posix-eq >> ok 2 selftests: proc: fd-002-posix-eq >> # selftests: proc: fd-003-kthread >> ok 3 selftests: proc: fd-003-kthread >> # selftests: proc: proc-loadavg-001 >> ok 4 selftests: proc: proc-loadavg-001 >> # selftests: proc: proc-empty-vm >> # proc-empty-vm: proc-empty-vm.c:184: test_proc_pid_maps: Assertion `rv == 0' failed. >> # /usr/bin/timeout: the monitored command dumped core >> # Aborted >> not ok 5 selftests: proc: proc-empty-vm # exit=134 >> # selftests: proc: proc-pid-vm >> # proc-pid-vm: proc-pid-vm.c:365: main: Assertion `rv == len' failed. >> # /usr/bin/timeout: the monitored command dumped core >> # Aborted >> >> Please find attached lshw output, dmesg, config and lsmod. >> >> I am available for further diagnostics. >> >> The platform is Ubuntu 22.10 kinetic kudu on a Lenovo Ideapad 3 15ITL6 laptop. > > The "bug" is that "call rel32" instruction testing for executable > vsyscall page which should be relocated to "call 0xffffffffff600000" > is messed up. Ubuntu 22.10 ships with "vsyscall=xonly" so there should not be > any faults when executing from it. But segfault happens with normal > randomised userspace address. > > I'll change it to "call *rax" which should be more robust (and works) > and free from relocations.
If you will need to test the patch in the same environment where the problem initially occurred, I am ready at your disposal.
Thanks, Mirsad
-- Mirsad Goran Todorovac Sistem inženjer Grafički fakultet | Akademija likovnih umjetnosti Sveučilište u Zagrebu -- System engineer Faculty of Graphic Arts | Academy of Fine Arts University of Zagreb, Republic of Croatia The European Union
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