linux-kernel - [x86/entry] 3d066520a3: kernel-selftests.x86.ptrace_syscall_32.step

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Date:   Mon, 15 Jun 2020 08:44:41 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org
Subject: [x86/entry] 3d066520a3:
 kernel-selftests.x86.ptrace_syscall_32.step_again.fail

Greeting,

FYI, we noticed the following commit (built with gcc-4.9):

commit: 3d066520a322dba3135c9d6332c84a369f1ba8c2 ("x86/entry: Stop using regs->orig_ax == -1 to mean "not a syscall"")
https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git x86/entry

in testcase: kernel-selftests
with following parameters:

	group: kselftests-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: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):



If you fix the issue, kindly add following tag
Reported-by: kernel test robot <rong.a.chen@...el.com>



# selftests: x86: ptrace_syscall_32
# [RUN]	Check int80 return regs
# [OK]	getpid() preserves regs
# [OK]	kill(getpid(), SIGUSR1) preserves regs
# [SKIP]	AT_SYSINFO is not available
# [RUN]	ptrace-induced syscall restart
# [RUN]	SYSEMU
# [OK]	Initial nr and args are correct
# [RUN]	Restart the syscall (ip = 0xb7f60092)
# [OK]	Restarted nr and args are correct
# [RUN]	Change nr and args and restart the syscall (ip = 0xb7f60092)
# [OK]	Replacement nr and args are correct
# [OK]	Child exited cleanly
# [RUN]	kernel syscall restart under ptrace
# [RUN]	SYSCALL
# [OK]	Initial nr and args are correct
# [RUN]	SYSCALL
# [OK]	Args after SIGUSR1 are correct (ax = -514)
# [OK]	Child got SIGUSR1
# [RUN]	Step again
# [FAIL]	pause did not restart (nr=252, args=0 0 4294967220 3220090628 3220090768 3220090792)
ok 21 selftests: x86: ptrace_syscall_32
make: Leaving directory '/usr/src/perf_selftests-i386-randconfig-r015-20200612-3d066520a322dba3135c9d6332c84a369f1ba8c2/tools/testing/selftests/x86'


To reproduce:

        # build kernel
	cd linux
	cp config-5.7.0-08061-g3d066520a322d .config
	make HOSTCC=gcc-4.9 CC=gcc-4.9 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
Rong Chen


View attachment "config-5.7.0-08061-g3d066520a322d" of type "text/plain" (134608 bytes)

View attachment "job-script" of type "text/plain" (4946 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (21736 bytes)

View attachment "kernel-selftests" of type "text/plain" (17428 bytes)