From: Helge Deller <deller@gmx.de>

The 5th argument isn't printed, but instead the 4th argument is shown twice.
Fix this, and print the FUTEX_BITSET_MATCH_ANY string constant instead of -1
if the op is FUTEX_WAIT_BITSET or FUTEX_WAKE_BITSET.

Signed-off-by: Helge Deller <deller@gmx.de>
---
 linux-user/strace.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/linux-user/strace.c b/linux-user/strace.c
index 18bc6c800c..ca67cfd09d 100644
--- a/linux-user/strace.c
+++ b/linux-user/strace.c
@@ -4150,7 +4150,12 @@ print_futex(CPUArchState *cpu_env, const struct syscallname *name,
             break;
     }
     print_pointer(arg4, 0);
-    print_raw_param("%d", arg4, 1);
+    if ((op == FUTEX_WAIT_BITSET || (op == FUTEX_WAKE_BITSET)) &&
+        (arg5 == FUTEX_BITSET_MATCH_ANY)) {
+        qemu_log("FUTEX_BITSET_MATCH_ANY");
+    } else {
+        print_raw_param("%#x", arg5, 1);
+    }
     print_syscall_epilogue(name);
 }
 #endif
-- 
2.52.0

On Fri, 23 Jan 2026 at 15:16, <deller@kernel.org> wrote:
>
> From: Helge Deller <deller@gmx.de>
>
> The 5th argument isn't printed, but instead the 4th argument is shown twice.
> Fix this, and print the FUTEX_BITSET_MATCH_ANY string constant instead of -1
> if the op is FUTEX_WAIT_BITSET or FUTEX_WAKE_BITSET.
>
> Signed-off-by: Helge Deller <deller@gmx.de>
> ---
>  linux-user/strace.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/linux-user/strace.c b/linux-user/strace.c
> index 18bc6c800c..ca67cfd09d 100644
> --- a/linux-user/strace.c
> +++ b/linux-user/strace.c
> @@ -4150,7 +4150,12 @@ print_futex(CPUArchState *cpu_env, const struct syscallname *name,
>              break;
>      }
>      print_pointer(arg4, 0);
> -    print_raw_param("%d", arg4, 1);
> +    if ((op == FUTEX_WAIT_BITSET || (op == FUTEX_WAKE_BITSET)) &&
> +        (arg5 == FUTEX_BITSET_MATCH_ANY)) {
> +        qemu_log("FUTEX_BITSET_MATCH_ANY");
> +    } else {
> +        print_raw_param("%#x", arg5, 1);
> +    }
>      print_syscall_epilogue(name);
>  }
>  #endif

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

thanks
-- PMM