Seems to be a recent regression, maybe related to entry/exit work changes.
# ./tools/testing/selftests/x86/ptrace_syscall_32
[RUN] Check int80 return regs
[OK] getpid() preserves regs
[OK] kill(getpid(), SIGUSR1) preserves regs
[RUN] Check AT_SYSINFO return regs
[OK] getpid() preserves regs
[OK] kill(getpid(), SIGUSR1) preserves regs
[RUN] ptrace-induced syscall restart
Child will make one syscall
[RUN] SYSEMU
[FAIL] Initial args are wrong (nr=224, args=10 11 12 13 14 4289172732)
[RUN] Restart the syscall (ip = 0xf7f3b549)
[OK] Restarted nr and args are correct
[RUN] Change nr and args and restart the syscall (ip = 0xf7f3b549)
[OK] Replacement nr and args are correct
[OK] Child exited cleanly
[RUN] kernel syscall restart under ptrace
Child will take a nap until signaled
[RUN] SYSCALL
[FAIL] Initial args are wrong (nr=29, args=0 0 0 0 0 4289172732)
[RUN] SYSCALL
[OK] Args after SIGUSR1 are correct (ax = -514)
[OK] Child got SIGUSR1
[RUN] Step again
[OK] pause(2) restarted correctly
