Re: [LTP] [PATCH] syscalls: fix some failure on arch X86_64

Wei Yongjun
2009-11-29T01:23:59Z

Garrett Cooper wrote:
> On Fri, Nov 27, 2009 at 2:07 AM, liubo <liubo2009@cn.fujitsu.com> wrote:
>
>> Hi, Garrett
>>
>> On 11/27/2009 04:50 PM, Garrett Cooper wrote:
>>
>> On Thu, Nov 26, 2009 at 10:49 PM, Garrett Cooper <yanegomi@gmail.com> wrote:
>>
>>
>> On Thu, Nov 26, 2009 at 9:33 PM, liubo <liubo2009@cn.fujitsu.com> wrote:
>>
>>
>> Hi, Garrett
>> On 11/26/2009 07:11 PM, Garrett Cooper wrote:
>>
>> On Mon, Nov 16, 2009 at 12:53 AM, liubo <liubo2009@cn.fujitsu.com> wrote:
>>
>>
>> Hi, Subrata,
>> On 11/16/2009 04:13 PM, Subrata Modak wrote:
>>
>> Liubo,
>>
>> Are you sending an updated patch post this discussion ?
>>
>>
>>
>> Yes, I'll resend a updated patch about these rt_sigs.
>>
>> Regards--
>> Liubo
>>
>> Regards--
>> Subrata
>>
>> On Wed, 2009-11-11 at 13:03 +0800, Wei Yongjun wrote:
>>
>>
>> Mike Frysinger wrote:
>>
>>
>> On Tuesday 10 November 2009 04:38:30 liubo wrote:
>>
>>
>>
>> 1) rt_sigaction
>> "sigaction" has the structure:
>>
>> struct sigaction {
>> __sighandler_t sa_handler;
>> unsigned long sa_flags;
>> #ifdef SA_RESTORER
>> __sigrestore_t sa_restorer;
>> #endif
>> sigset_t sa_mask; /* mask last for extensibility */
>> };
>>
>> However, on arch x86_64, if we directly get to call rt_sigaction,
>> the argument "sa_restorer" will not be fulfilled, and this will lead
>> to segment fault.
>> on arch x86_64, if sa_restorer is not set, kernel will lead to segment
>> fault. In other arch, if sa_restorer is not set, kernel can do the correct
>> work. To avoid this segment fault, we use glibc function
>> "int sigaction(...);" instead, which can fulfill the argument
>> "sa_restorer".
>>
>>
>>
>> which defeats the purpose of the test. there is no guarantee that the C
>> library sigaction function is implemented via the __NR_rt_sigaction syscall.
>>
>>
>>
>> In x86_64, it do this. And If we want to use __NR_rt_sigaction syscall
>> directly, we must fill the sa_restorer and set the RESTORER flag to
>> sa_mask. If we do not set the sa_restorer, kill will always cause
>> segment fault.
>>
>>
>>
>>
>>
>>
>> 2) rt_sigprocmask
>> This failure contains two aspects,
>> the first is the segment fault as described in 1),
>> the second is that testcase uses a unknown signal 33 for test,
>> and this will lead sigaction cannot bind signal 33 to the action.
>>
>> So, we attempt to use a known signal instead, such as 34.
>>
>>
>>
>> which is just as bogus and unportable. if the test needs a real time
>> signal,
>> it should leverage the sigrtmin...sigrtmax defines.
>> -mike
>>
>>
>> I see what you mean about this testcase segfaulting now.
>>
>> I've done some exploring, and while sigaction does map to rt_sigaction
>> on ia64 and x86_64, it won't on arm, mips, s390*, sh, or x86.
>>
>> Furthermore, the problem is actually being caused by the fact that
>> we're not even calling sigaddset properly!
>>
>> gcooper@orangebox
>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction $ gdb
>> ./rt_sigaction01
>> GNU gdb 6.8
>> Copyright (C) 2008 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later
>> <http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "x86_64-pc-linux-gnu"...
>> (gdb) c
>> The program is not being run.
>> (gdb) r
>> Starting program:
>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01
>> thread:20
>> [Thread debugging using libthread_db enabled]
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 1 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 2 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 3 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 4 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 5 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 6 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 7 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 8 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 9 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 10 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 11 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 12 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 13 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 14 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 15 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 16 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 17 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 18 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 19 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 20 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 21 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 22 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 23 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 24 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 25 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 26 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 27 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 28 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 29 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>> rt_sigaction01 0 TINFO : sigaddset(..) failed
>> rt_sigaction01 30 TFAIL : rt_sigaction01 failed:
>> TEST_ERRNO=EINVAL(22): Invalid argument
>>
>> So, the test needs fixing, anyhow. After I fixed it, the test still
>> segfaulted >:( --
>>
>> gcooper@orangebox
>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction $ gdb
>> ./rt_sigaction01
>> GNU gdb 6.8
>> Copyright (C) 2008 Free Software Foundation, Inc.
>> License GPLv3+: GNU GPL version 3 or later
>> <http://gnu.org/licenses/gpl.html>
>> This is free software: you are free to change and redistribute it.
>> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
>> and "show warranty" for details.
>> This GDB was configured as "x86_64-pc-linux-gnu"...
>> (gdb) r
>> Starting program:
>> /scratch/ltp-dev2/ltp/testcases/kernel/syscalls/rt_sigaction/rt_sigaction01
>> thread:20
>> [Thread debugging using libthread_db enabled]
>> rt_sigaction01 0 TINFO : signal: 34
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> [New Thread 0x7fdd451d66f0 (LWP 31927)]
>>
>> Program received signal SIG34, Real-time event 34.
>> [Switching to Thread 0x7fdd451d66f0 (LWP 31927)]
>> 0x00007fdd448944f7 in kill () from /lib/libc.so.6
>> (gdb) c
>> Continuing.
>>
>> Program received signal SIGSEGV, Segmentation fault.
>> 0x00007fdd448944f7 in kill () from /lib/libc.so.6
>>
>> So I tried to do some digging. glibc 2.8-20080602 does the following
>> for alpha, i386, and sysv:
>>
>> result = INLINE_SYSCALL (rt_sigaction, 4,
>> sig, act ? __ptrvalue (&kact) : NULL,
>> oact ? __ptrvalue (&koact) : NULL, _NSIG /
>> 8);
>>
>> The kernel code for rt_sigaction in kernel/signal.c is as follows:
>>
>> #ifdef __ARCH_WANT_SYS_RT_SIGACTION
>> SYSCALL_DEFINE4(rt_sigaction, int, sig,
>> const struct sigaction __user *, act,
>> struct sigaction __user *, oact,
>> size_t, sigsetsize)
>> {
>> struct k_sigaction new_sa, old_sa;
>> int ret = -EINVAL;
>>
>> /* XXX: Don't preclude handling different sized sigset_t's. */
>> if (sigsetsize != sizeof(sigset_t))
>> goto out;
>>
>> if (act) {
>> if (copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)))
>> return -EFAULT;
>> }
>>
>> ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa :
>> NULL);
>>
>> if (!ret && oact) {
>> if (copy_to_user(oact, &old_sa.sa, sizeof(old_sa.sa)))
>> return -EFAULT;
>> }
>> out:
>> return ret;
>> }
>>
>> This just blows my mind because rt_sigaction is just calling
>> do_sigaction, which is the same code as sigaction AFAICT, apart from
>> the fact that rt_sigaction completely disregards sa_restorer on some
>> architectures because it's obsolete, and requires the end-user to
>> specify a signal mask set (here's mips' version, which wasn't the same
>> as i386's version -- i386 had the old sa_restorer code):
>>
>> SYSCALL_DEFINE3(sigaction, int, sig, const struct sigaction __user *, act,
>> struct sigaction __user *, oact)
>> {
>> struct k_sigaction new_ka, old_ka;
>> int ret;
>> int err = 0;
>>
>> if (act) {
>> old_sigset_t mask;
>>
>> if (!access_ok(VERIFY_READ, act, sizeof(*act)))
>> return -EFAULT;
>> err |= __get_user(new_ka.sa.sa_handler, &act->sa_handler);
>> err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
>> err |= __get_user(mask, &act->sa_mask.sig[0]);
>> if (err)
>> return -EFAULT;
>>
>> siginitset(&new_ka.sa.sa_mask, mask);
>> }
>>
>> ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka :
>> NULL);
>>
>> if (!ret && oact) {
>> if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
>> return -EFAULT;
>> err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
>> err |= __put_user(old_ka.sa.sa_handler, &oact->sa_handler);
>> err |= __put_user(old_ka.sa.sa_mask.sig[0],
>> oact->sa_mask.sig);
>> err |= __put_user(0, &oact->sa_mask.sig[1]);
>> err |= __put_user(0, &oact->sa_mask.sig[2]);
>> err |= __put_user(0, &oact->sa_mask.sig[3]);
>> if (err)
>> return -EFAULT;
>> }
>>
>> return ret;
>> }
>>
>> I dunno -- maybe someone else can read the kernel code better than me,
>> but it looks like there's zero real value to the rt_sigaction
>> testcases, because it can be covered by sigaction...
>>
>>
>>
>> We just tell guys who use these testcases on arch x86_64 that
>> "Syscall rt_sigaction cannot be called directly on arch x86_64.",
>> can we?
>>
>>
>> It's not just x86_64 -- it's also ia64, and this may change
>> depending on the version of glibc and linux sources, so... this really
>> isn't a viable solution IMO.
>> Does anyone have any better suggestions, apart from just using a
>> preprocessor macro that would execute rt_sig* via their non-rt
>> equivalents in ltp_signal.h?
>>
>>
>> AHA! I think I discovered the kernel bug. rt_sigaction on x86_64
>> assumes that you're working in 32-bit space:
>>
>> gcooper@orangebox /usr/src/linux $ grep -r rt_sigaction
>> /usr/src/linux/arch/x86*
>> /usr/src/linux/arch/x86/ia32/sys_ia32.c:asmlinkage long
>> sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
>> Binary file /usr/src/linux/arch/x86/ia32/sys_ia32.o matches
>> Binary file /usr/src/linux/arch/x86/ia32/built-in.o matches
>> /usr/src/linux/arch/x86/ia32/ia32entry.S: .quad sys32_rt_sigaction
>> Binary file /usr/src/linux/arch/x86/ia32/ia32entry.o matches
>> Binary file /usr/src/linux/arch/x86/kernel/syscall_64.o matches
>> Binary file /usr/src/linux/arch/x86/kernel/built-in.o matches
>> /usr/src/linux/arch/x86/kernel/syscall_table_32.S: .long
>> sys_rt_sigaction
>> /usr/src/linux/arch/x86/include/asm/unistd_32.h:#define
>> __NR_rt_sigaction 174
>> /usr/src/linux/arch/x86/include/asm/unistd_64.h:#define
>> __NR_rt_sigaction 13
>> /usr/src/linux/arch/x86/include/asm/unistd_64.h:__SYSCALL(__NR_rt_sigaction,
>> sys_rt_sigaction)
>> /usr/src/linux/arch/x86/include/asm/sys_ia32.h:asmlinkage long
>> sys32_rt_sigaction(int, struct sigaction32 __user *,
>>
>> Watch (compiled with -m32):
>>
>> rt_sigaction01 0 TINFO : signal: 34
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 34
>> rt_sigaction01 0 TINFO : signal: 35
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 35
>> rt_sigaction01 0 TINFO : signal: 36
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 36
>> rt_sigaction01 0 TINFO : signal: 37
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 37
>> rt_sigaction01 0 TINFO : signal: 38
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 38
>> rt_sigaction01 0 TINFO : signal: 39
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 39
>> rt_sigaction01 0 TINFO : signal: 40
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 40
>> rt_sigaction01 0 TINFO : signal: 41
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 41
>> rt_sigaction01 0 TINFO : signal: 42
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 42
>> rt_sigaction01 0 TINFO : signal: 43
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 43
>> rt_sigaction01 0 TINFO : signal: 44
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 44
>> rt_sigaction01 0 TINFO : signal: 45
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 45
>> rt_sigaction01 0 TINFO : signal: 46
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 46
>> rt_sigaction01 0 TINFO : signal: 47
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 47
>> rt_sigaction01 0 TINFO : signal: 48
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 48
>> rt_sigaction01 0 TINFO : signal: 49
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 49
>> rt_sigaction01 0 TINFO : signal: 50
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 50
>> rt_sigaction01 0 TINFO : signal: 51
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 51
>> rt_sigaction01 0 TINFO : signal: 52
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 52
>> rt_sigaction01 0 TINFO : signal: 53
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 53
>> rt_sigaction01 0 TINFO : signal: 54
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 54
>> rt_sigaction01 0 TINFO : signal: 55
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 55
>> rt_sigaction01 0 TINFO : signal: 56
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 56
>> rt_sigaction01 0 TINFO : signal: 57
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 57
>> rt_sigaction01 0 TINFO : signal: 58
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 58
>> rt_sigaction01 0 TINFO : signal: 59
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 59
>> rt_sigaction01 0 TINFO : signal: 60
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 60
>> rt_sigaction01 0 TINFO : signal: 61
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 61
>> rt_sigaction01 0 TINFO : signal: 62
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 62
>> rt_sigaction01 0 TINFO : signal: 63
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 63
>> rt_sigaction01 0 TINFO : signal: 64
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_RESETHAND|SA_SIGINFO
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>> rt_sigaction01 0 TINFO : sa.sa_flags = SA_NOMASK
>> rt_sigaction01 0 TINFO : Signal Handler Called with signal number 64
>>
>> So from what I can tell, the sucker isn't properly translating
>> something in 64-bit space, and instead of properly trapping the issue,
>> it's segfaulting and dying -_-.
>>
>> Ultimately the problem from what I can see is that bi-arch (32-bit on
>> 64-bit kernel) 64-bit rt_sig* support is broken. I don't know about
>> straight, non-bi-arch 64-bit rt_sig* support...
>>
>> If someone could verify this with a little more kernel experience, or
>> someone could direct me on how the issue could be trapped in gdb so I
>> could inspect the registers and ensure the traps are or aren't being
>> done properly, that would be helpful.
>>
>>
>>
>> Although I had figured this, I think your solution is just a compromise,
>> isn't it?
>> Change 64-bit rt_sigaction to 32-bit rt_sigaction to pass the testcase.
>> Let's try to use 64bit rt_sigaction to pass it. ^_^
>>
>
> Luibo,
> It isn't really a compromise -- it's an observation of what I
> consider broken functionality in the 32-bit <-> 64-bit translation
> layers in the kernel ;)... 32-bit and 64-bit rt_sigaction should
> function equivalently, but they don't today.
> Thanks,
> -Garrett
>
>

There is other issue in x86_64. see the following kernel source
code from file arch/x86/kernel/signal.c:

412 #else /* !CONFIG_X86_32 */
413 static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
414 sigset_t *set, struct pt_regs *regs)
415 {
......
430
431 put_user_try {
432 /* Create the ucontext. */
433 if (cpu_has_xsave)
434 put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
435 else
436 put_user_ex(0, &frame->uc.uc_flags);
437 put_user_ex(0, &frame->uc.uc_link);
438 put_user_ex(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
439 put_user_ex(sas_ss_flags(regs->sp),
440 &frame->uc.uc_stack.ss_flags);
441 put_user_ex(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
442 err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
443 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
444
445 /* Set up to return from userspace. If provided, use a stub
446 already in userspace. */
447 /* x86-64 should always use SA_RESTORER. */
448 if (ka->sa.sa_flags & SA_RESTORER) {
449 put_user_ex(ka->sa.sa_restorer, &frame->pretcode);
450 } else {
451 /* could use a vstub here */
452 err |= -EFAULT;
453 }
454 } put_user_catch(err);
455
......
476 return 0;
477 }
478 #endif /* CONFIG_X86_32 */

Line 448~453 said that x86-64 should always use SA_RESTORER flag ans set the
sa_restorer, otherwise kernel will return EFAULT.

In test rt_sigaction01.c, it used rt_sigaction syscall directly without the
SA_RESTORER flag and null sa_restorer handler, so the test cases for x86_64
will aways fail. In Liu's fix, he used sigaction() instead of rt_sigaction
syscall. sigaction() will fill the SA_RESTORER flag and sa_restorer handler,
so he can pass the test case in x86_64.

Fill the SA_RESTORER flag and sa_restorer handler is the point I think.

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