Fix INTERNAL_SYSCALL uninitialized resultvar

[rishabhBudhouliya]

Purpose

As reported in Lind-Project/lind-wasm-apps#161, nginx fails when setgid returns a non-zero value.

>> cat lindfs/var/log/nginx/error.log 
2026/03/26 16:17:37 [emerg] 3#0: setgid(65534) failed
2026/03/26 16:17:37 [alert] 2#0: worker process 3 exited with fatal code 2 and cannot be respawned

Upon investigation, nginx calls setgid which goes through this trace

1. lind-wasm/src/glibc/sysdeps/unix/sysv/linux/setgid.c

   Lines 23 to 29 in ebbe66c

   	int
   	__setgid (gid_t gid)
   	{
   	#ifdef __NR_setgid32
   	return INLINE_SETXID_SYSCALL (setgid32, 1, gid);
   	#else
   	return INLINE_SETXID_SYSCALL (setgid, 1, gid);

2. lind-wasm/src/glibc/sysdeps/unix/sysv/linux/i386/sysdep.h

   Lines 320 to 329 in ebbe66c

   	#define INTERNAL_SYSCALL(name, nr, args...) \
   	({ \
   	register unsigned int resultvar; \
   	INTERNAL_SYSCALL_MAIN_##nr (name, args); \
   	(int) resultvar; })
   	#define INTERNAL_SYSCALL_NCS(name, nr, args...) \
   	({ \
   	register unsigned int resultvar; \
   	INTERNAL_SYSCALL_MAIN_NCS_##nr (name, args); \
   	(int) resultvar; })

The register unsigned int resultvar; is uninitialized which returns a garbage value back to nginx.

Fix

Initialize resultvar as 0 solved the problem

Test

lind@9d66bdc4863c:~/lind-wasm-apps$  bash nginx/test.sh 
[nginx-test] nginx binary found at: /home/lind/lind-wasm/lindfs/usr/sbin/nginx
[nginx-test] starting nginx on port 8080...
[nginx-test] nginx ready (PID 273205)

[nginx-test] === Running nginx tests ===

[nginx-test] [PASS] GET index page
[nginx-test] [PASS] HEAD request
[nginx-test] [PASS] 404 error page
[nginx-test] [PASS] Static file serving
[nginx-test] [PASS] Content-Length validation
[nginx-test] [PASS] POST method
[nginx-test] [PASS] Multiple sequential requests
[nginx-test] [PASS] Keepalive connection reuse
[nginx-test] [PASS] Concurrent requests

[nginx-test] 9/9 tests passed, 0 failed
[nginx-test] Log saved to: /tmp/nginx_test_results.log

[github-actions]

End-to-End Test Report

Test Preview

Unified Test Report

grate harness

Metric	Value
Total	10
Success	10
Failures	0
Compile Failures	0
Runtime Failures	0
Timeout Failures	0
Missing Pair Failures	0

Cases

Test	Status	Error Type	Output
concurrent-request/geteuid_grate.c	Success		STDOUT: [Grate|geteuid] Registering geteuid handler for cage 2 in grate 1 with fn ptr addr: 3 [Cage | geteuid] PASS: 1000000 calls returned 10 [Grate|geteuid] PASS STDERR:
interposing-calls/interpose-exec_grate.c	Success		STDOUT: [Grate|interpose-exec] Registering exec handler for cage 2 in grate 1 with fn ptr addr: 3 [Grate|interpose-exec] Handling function ptr: 3 from cage: 1 [Grate|interpose-exec] In exec_grate 1 handler for cage: 1 [Grate|interpose-exec] Handling function ptr: 3 from cage: 1 [Grate|interpose-exec] In exec_grate 1 handler for cage: 1 Exec successful, argv[1]: --execd [Grate|interpose-exec] PASS STDERR:
interposing-calls/interpose-exit_grate.c	Success		STDOUT: [Grate|interpose-exit] Registering exit handler for cage 2 in grate 1 with fn ptr addr: 3 Exiting... [Grate|interpose-exit] PASS STDERR:
interposing-calls/interpose-fork_grate.c	Success		STDOUT: [Grate|interpose-fork] Registering fork handler for cage 2 in grate 1 with fn ptr addr: 3 [Grate|interpose-fork] Handling function ptr: 3 from cage: 1 [Grate|interpose-fork] In fork_grate 1 handler for cage: 1 [Grate|interpose-fork] PASS STDERR:
interposing-calls/interpose-mmap_grate.c	Success		STDOUT: [Grate|interpose-mmap] Registering mmap handler for cage 2 in grate 1 with fn ptr addr: 3 [Grate|interpose-mmap] Handling function ptr: 3 from cage: 1 [Grate|interpose-mmap] In mmap_grate 1 handler for cage: 1 [Grate|interpose-mmap] Handling function ptr: 3 from cage: 1 [Grate|interpose-mmap] In mmap_grate 1 handler for cage: 1 mmap test: PASS [Grate|interpose-mmap] PASS STDERR:
interposing-calls/interpose-register_grate.c	Success		STDOUT: [Grate|interpose-register] Registering register_handler for cage 2 in grate 1 with fn ptr addr: 4 [cage] registering 107. grateid: 2 cageid: 3 [Grate|interpose-register] Handling function ptr: 4 from cage: 1 [Grate|interpose-register] In register_grate 1 handler for cage: 1 [Grate|geteuid] Registering geteuid handler for cage 1 in grate 1 with fn ptr addr: 3 [Grate|interpose-register] Handling function ptr: 3 from cage: 1 [Grate|interpose-register] In register_grate 1 handler for cage: 1 [Grate|interpose-register] PASS STDERR:
multi-register_grate.c	Success		STDOUT: [Grate|multi-register_grate] Registering geteuid handler for cage 2 in grate 1 with fn ptr addr: 3 [Grate|multi-register_grate] Registering getuid handler for cage 2 in grate 1 with fn ptr addr: 4 [Grate|multi-register_grate] Handling function ptr: 3 from cage: 1 [Grate|multi-register_grate] In multi-register_grate 1 handler for cage: 1 [Grate|multi-register_grate] Handling function ptr: 4 from cage: 1 [Grate|multi-register_grate] In multi-register_grate 1 handler for cage: 1 [Cage | multi-register] PASS: geteuid=10, getuid=20 [Grate|multi-register] PASS STDERR:
race-test_grate.c	Success		STDOUT: pass STDERR:
simple-tests/cpdata_grate.c	Success		STDOUT: [Grate|open] intercepts open call: thiscage=1, arg1cage=2 [Grate|open] copied pathname: random [cage] fd=10 STDERR:
simple-tests/geteuid_grate.c	Success		STDOUT: [Grate|geteuid] Registering geteuid handler for cage 2 in grate 1 with fn ptr addr: 3 [Grate|geteuid] Handling function ptr: 3 from cage: 1 [Grate|geteuid] In geteuid_grate 1 handler for cage: 1 [Cage | geteuid] PASS: geteuid ret = 10 [Grate|geteuid] PASS STDERR:

wasm harness

Test Report

Deterministic Tests

Summary

Metric	Count
Total Test Cases	197
Number of Successes	196
Number of Failures	1
Number of Compilation Failure Native	0
Number of Runtime Failure Native	0
Number of Segmentation Fault Native	0
Number of Timeout During Native	0
Number of Lind Wasm Compile Failure	0
Number of Lind Wasm Runtime Failure	0
Number of Lind Wasm Segmentation Failure	0
Number of Timeout During Lind Wasm run	0
Number of Unknown Failure	1
Number of C Compiler and Wasm Output mismatch	0
Number of Fail Test: Native Succeeded (Should Fail)	0
Number of Fail Test: Wasm Succeeded (Should Fail)	0
Number of Fail Test: Both Native and Wasm Succeeded (Should Fail)	0
Number of Fail Test: Native Compilation Failure (Should Succeed)	0
Number of Fail Test: Wasm Compilation Failure (Should Succeed)	0

Test Results by Category

Test Case	Status	Error Type	Native Time	Wasm Time	Output
File Tests
chartests.c	Success	None	0.042948s	4.405335s	Success
chdir_getcwd.c	Success	None	0.041955s	4.319075s	Success
chmod.c	Success	None	0.048585s	4.255954s	Success
clock_gettime_highlevel.c	Success	None	0.278998s	4.630483s	Success
clock_gettime_simple.c	Success	None	0.038225s	4.405489s	Success
cloexec.c	Success	None	0.046920s	4.044627s	Success
close.c	Success	None	0.047440s	4.333466s	Success
creat_access.c	Success	None	0.048891s	4.491506s	Success
doubleclose.c	Success	None	0.039847s	3.968898s	Success
dup.c	Success	None	0.037914s	4.257606s	Success
dup2.c	Success	None	0.042894s	3.919383s	Success
dup3.c	Success	None	0.043544s	4.429970s	Success
dupwrite.c	Success	None	0.044638s	3.864574s	Success
etc_conf.c	Success	None	0.039510s	4.222308s	Success
fchdir.c	Success	None	0.048052s	4.489032s	Success
fchmod.c	Success	None	0.046849s	4.481908s	Success
fcntl.c	Success	None	0.042789s	4.310216s	Success
fdatasync.c	Success	None	0.044732s	4.402338s	Success
filetest.c	Success	None	0.045191s	4.036977s	Success
filetest1000.c	Success	None	0.050403s	4.058818s	Success
flock.c	Success	None	0.052082s	4.467679s	Success
fstat.c	Success	None	0.047436s	4.444535s	Success
fstatfs.c	Success	None	0.041675s	4.401481s	Success
fsync.c	Success	None	0.046594s	4.432083s	Success
ftruncate.c	Success	None	0.046497s	4.305767s	Success
getcwd.c	Success	None	0.043014s	4.511348s	Success
getrandom.c	Success	None	0.045139s	4.454506s	Success
ioctl.c	Success	None	0.048527s	4.487510s	Success
link.c	Success	None	0.049018s	4.442983s	Success
locale_test.c	Success	None	0.056117s	6.070356s	Success
lseek.c	Success	None	0.050430s	4.509781s	Success
mkdir_rmdir.c	Success	None	0.046153s	4.466333s	Success
mkfifo_test.c	Success	None	0.051260s	4.521138s	Success
mknod.c	Success	None	0.043435s	4.276519s	Success
nocancel_io.c	Success	None	0.050069s	5.712220s	Success
open.c	Success	None	0.040899s	4.392822s	Success
openat.c	Success	None	0.041938s	4.355023s	Success
path_conversion_safety.c	Success	None	0.048478s	4.401346s	Success
pread_pwrite.c	Success	None	0.044988s	4.427529s	Success
printf.c	Success	None	0.038737s	4.004691s	Success
prlimit64.c	Success	None	0.041645s	3.999839s	Success
read.c	Success	None	0.046399s	4.397840s	Success
readbytes.c	Success	None	0.042947s	4.024440s	Success
readlink.c	Success	None	0.043192s	4.241105s	Success
readlinkat.c	Success	None	0.048269s	4.410043s	Success
readv_writev_test.c	Success	None	0.047236s	4.399890s	Success
rename.c	Success	None	0.048495s	4.475376s	Success
sc-writev.c	Success	None	0.045313s	4.408494s	Success
stat.c	Success	None	0.047073s	4.442775s	Success
statfs.c	Success	None	0.042252s	4.464788s	Success
sync_file_range.c	Success	None	0.043389s	4.452712s	Success
timespec_time_t_compat.c	Success	None	0.042969s	5.727775s	Success
truncate.c	Success	None	0.046320s	4.319183s	Success
unlink.c	Success	None	0.047269s	4.469249s	Success
unlinkat.c	Success	None	0.044868s	4.269723s	Success
write.c	Success	None	0.041243s	3.978075s	Success
writeloop.c	Success	None	0.049344s	4.011531s	Success
writepartial.c	Success	None	0.046212s	4.019043s	Success
writev.c	Success	None	0.047603s	4.415363s	Success
Math Tests
math_link_smoke.c	Success	None	0.049794s	3.900650s	Success
math_tests.c	Success	None	0.052196s	4.117896s	Success
Memory Tests
brk.c	Success	None	0.043230s	4.381381s	Success
fork_large_memory.c	Success	None	0.074572s	4.493795s	Success
malloc.c	Success	None	0.041179s	3.934143s	Success
malloc_large.c	Success	None	0.042869s	4.264664s	Success
memcpy.c	Success	None	0.040602s	3.880326s	Success
memory_error_test.c	Success	None	0.047753s	4.388347s	Success
mmap.c	Success	None	0.039443s	4.370100s	Success
mmap_aligned.c	Success	None	0.040818s	4.354243s	Success
mmap_complicated.c	Success	None	0.044421s	4.354780s	Success
mmap_file.c	Success	None	0.045137s	4.329355s	Success
mmap_shared.c	Success	None	0.045792s	4.450190s	Success
mmaptest.c	Success	None	0.041933s	4.921209s	Success
mprotect.c	Success	None	0.039641s	4.287102s	Success
mprotect_boundary.c	Success	None	0.040134s	4.313520s	Success
mprotect_end_region.c	Success	None	0.038719s	4.323502s	Success
mprotect_middle_region.c	Success	None	0.040100s	4.292352s	Success
mprotect_multiple_times.c	Success	None	0.041532s	4.382511s	Success
mprotect_same_value.c	Success	None	0.040374s	4.338696s	Success
mprotect_spanning_regions.c	Success	None	0.040037s	4.305646s	Success
sbrk.c	Success	None	0.041635s	4.519143s	Success
segfault.c	Success	None	0.044463s	4.324186s	Success
shm.c	Success	None	0.045387s	4.423904s	Success
shmtest.c	Success	None	0.042103s	4.327023s	Success
tcache_test.c	Failure	Unknown_Failure	0.048090s	4.675941s	tcache reuse: yes
thread_malloc_sequential.c	Success	None	0.046061s	4.457466s	Success
vtable.c	Success	None	0.050592s	3.941385s	Success
Networking Tests
accept4.c	Success	None	0.049926s	4.348411s	Success
dns_resolve_test.c	Success	None	0.044654s	6.004716s	Success
dnstest.c	Success	None	0.045215s	4.249714s	Success
epoll_edge_triggered.c	Success	None	0.200992s	4.516568s	Success
epollcreate1.c	Success	None	0.045996s	4.393466s	Success
error_handling_net.c	Success	None	0.052172s	4.408463s	Success
getaddrinfo_test.c	Success	None	0.047311s	6.044247s	Success
getaddrinfo_unspec.c	Success	None	0.066715s	6.129802s	Success
gethostname.c	Success	None	0.040812s	3.952626s	Success
getifaddrs.c	Success	None	0.046801s	4.377743s	Success
getsockname.c	Success	None	0.046490s	4.333629s	Success
getsockopt.c	Success	None	0.047401s	4.273158s	Success
ipv6_basic.c	Success	None	0.049076s	4.407220s	Success
makepipe.c	Success	None	0.039112s	3.875807s	Success
nonblocking_eagain.c	Success	None	0.049580s	4.363001s	Success
pipe.c	Success	None	0.046230s	4.346258s	Success
pipe2.c	Success	None	0.046218s	4.311931s	Success
pipeinput.c	Success	None	0.046694s	4.335460s	Success
pipeinput2.c	Success	None	0.048162s	4.358148s	Success
pipeonestring.c	Success	None	0.048026s	4.336619s	Success
pipepong.c	Success	None	0.046242s	4.372659s	Success
pipewrite.c	Success	None	0.042214s	4.414199s	Success
poll.c	Success	None	0.044864s	4.257196s	Success
recvfrom-sendto.c	Success	None	0.048449s	4.363014s	Success
sendmsg_recvmsg_test.c	Success	None	0.045098s	4.311667s	Success
serverclient.c	Success	None	0.045289s	3.897701s	Success
shutdown.c	Success	None	0.047729s	3.912869s	Success
shutdown_fork.c	Success	None	0.046287s	4.410128s	Success
simple-select.c	Success	None	0.046510s	4.362185s	Success
simple_epoll.c	Success	None	0.045435s	4.290012s	Success
socket.c	Success	None	0.043786s	3.893072s	Success
socket_cloexec.c	Success	None	0.044993s	4.306379s	Success
socket_options_advanced.c	Success	None	0.049261s	4.305994s	Success
socketepoll.c	Success	None	0.044394s	3.914657s	Success
socketpair.c	Success	None	0.044080s	4.300539s	Success
socketselect.c	Success	None	0.044289s	4.277700s	Success
udp_send_recv.c	Success	None	0.151941s	4.491485s	Success
uds-getsockname.c	Success	None	0.046007s	4.330742s	Success
uds-nb-select.c	Success	None	2.052570s	6.490185s	Success
uds-serverclient.c	Success	None	0.049870s	4.395014s	Success
uds-socketselect.c	Success	None	0.046768s	3.955175s	Success
writev_socket.c	Success	None	0.047294s	4.344496s	Success
Process Tests
barrier_test.c	Success	None	0.043165s	4.472917s	Success
chain_thread.c	Success	None	1.045625s	5.408232s	Success
ctor_syscall_test.c	Success	None	0.035823s	4.230631s	Success
cxa_atexit_test.c	Success	None	0.042885s	3.850866s	Success
execve_shebang.c	Success	None	0.045094s	4.286691s	Success
exit.c	Success	None	0.041662s	3.852495s	Success
exit_failure.c	Success	None	0.044411s	3.931562s	Success
exit_group_thread.c	Success	None	0.045547s	4.424763s	Success
flockfile_test.c	Success	None	0.044506s	4.445280s	Success
fork2malloc.c	Success	None	0.046641s	4.320206s	Success
fork_select.c	Success	None	0.043852s	4.295558s	Success
fork_simple.c	Success	None	0.042666s	4.265667s	Success
fork_syscall.c	Success	None	0.048437s	4.352163s	Success
fork_tls_ctype.c	Success	None	0.047350s	4.352741s	Success
forkandopen.c	Success	None	0.045056s	4.280112s	Success
forkdup.c	Success	None	0.045715s	3.911033s	Success
forkexecuid.c	Success	None	0.042609s	4.379851s	Success
forkexecv-arg.c	Success	None	0.043496s	4.358795s	Success
forkexecv.c	Success	None	0.042278s	4.308380s	Success
forkfiles.c	Success	None	0.045043s	4.306615s	Success
forkmalloc.c	Success	None	0.045977s	4.301130s	Success
forknodup.c	Success	None	0.044942s	4.274078s	Success
function-ptr.c	Success	None	0.040794s	4.254101s	Success
getegid_syscall.c	Success	None	0.044915s	4.319785s	Success
getgid_syscall.c	Success	None	0.045315s	4.300687s	Success
getpid.c	Success	None	0.037978s	4.188892s	Success
getpid_syscall.c	Success	None	0.045617s	4.320812s	Success
getppid.c	Success	None	0.045003s	4.336126s	Success
getppid_syscall.c	Success	None	0.048228s	4.317166s	Success
getuid.c	Success	None	0.044510s	4.240859s	Success
getuid_syscall.c	Success	None	0.043354s	4.318514s	Success
hello-arg.c	Success	None	0.037445s	3.850627s	Success
hello.c	Success	None	0.036443s	3.853430s	Success
longjmp.c	Success	None	0.037358s	3.890533s	Success
mutex.c	Success	None	2.047582s	6.511555s	Success
printf_deadlock_smoke.c	Success	None	0.051391s	4.563362s	Success
printf_thread_test.c	Success	None	0.043170s	4.448993s	Success
sem_forks.c	Success	None	0.046334s	4.297295s	Success
setsid.c	Success	None	0.037504s	3.840115s	Success
template.c	Success	None	0.043604s	4.279712s	Success
test_exec_nofork.c	Success	None	0.044576s	4.320928s	Success
test_unlink_open_file.c	Success	None	0.040707s	3.849236s	Success
thread-test.c	Success	None	0.040788s	4.406153s	Success
thread.c	Success	None	0.040481s	4.397311s	Success
thread_cageid_race.c	Success	None	0.040978s	4.409322s	Success
tls_test.c	Success	None	0.043334s	4.415520s	Success
uname.c	Success	None	0.039586s	4.223685s	Success
wait.c	Success	None	2.043647s	5.933347s	Success
waitpid_anychild.c	Success	None	0.044682s	4.329269s	Success
waitpid_syscall.c	Success	None	1.044829s	5.346685s	Success
waitpid_wnohang.c	Success	None	0.045109s	3.922460s	Success
Signal Tests
alarm.c	Success	None	7.042955s	10.899988s	Success
eintr_fork_signal.c	Success	None	1.046652s	5.334771s	Success
kill.c	Success	None	1.053671s	5.415393s	Success
setitimer.c	Success	None	7.044898s	10.931836s	Success
sigalrm.c	Success	None	2.046211s	5.907280s	Success
sigchld.c	Success	None	1.047067s	4.984528s	Success
signal-fork.c	Success	None	4.046186s	7.955287s	Success
signal-simple.c	Success	None	0.046658s	3.886763s	Success
signal_SIGCHLD.c	Success	None	0.043653s	4.327985s	Success
signal_fork.c	Success	None	0.041376s	4.311612s	Success
signal_int_ignored.c	Success	None	2.044197s	6.351926s	Success
signal_kill_cleanup.c	Success	None	1.043111s	5.303488s	Success
signal_procmask.c	Success	None	0.040123s	4.266204s	Success
signal_recursive.c	Success	None	0.039570s	3.857645s	Success
signal_sa_mask.c	Success	None	0.040633s	3.874010s	Success
sigpipe.c	Success	None	1.046212s	5.359979s	Success
sigprocmask.c	Success	None	1.044443s	4.929541s	Success

Fail Tests

Summary

Metric	Count
Total Test Cases	3
Number of Successes	3
Number of Failures	0
Number of Compilation Failure Native	0
Number of Runtime Failure Native	0
Number of Segmentation Fault Native	0
Number of Timeout During Native	0
Number of Lind Wasm Compile Failure	0
Number of Lind Wasm Runtime Failure	0
Number of Lind Wasm Segmentation Failure	0
Number of Timeout During Lind Wasm run	0
Number of Unknown Failure	0
Number of C Compiler and Wasm Output mismatch	0
Number of Fail Test: Native Succeeded (Should Fail)	0
Number of Fail Test: Wasm Succeeded (Should Fail)	0
Number of Fail Test: Both Native and Wasm Succeeded (Should Fail)	0
Number of Fail Test: Native Compilation Failure (Should Succeed)	0
Number of Fail Test: Wasm Compilation Failure (Should Succeed)	0

Test Results by Category

Test Case	Status	Error Type	Native Time	Wasm Time	Output
Memory Tests
mmap-negative1.c	Success	None	0.084466s	4.558102s	Success
mmap-negative2.c	Success	None	0.083741s	4.575825s	Success
Signal Tests
signal_resethand.c	Success	None	1.045604s	4.938808s	Success

[rishabhBudhouliya]

As I was reading more about how we handle no-op syscalls in modified glibc, it would be more coherent and clean using the INLINE_SYSCALL_CALL macro to stub this kernel path which was mistakenly missed instead of fixing the header files of a specific port.

[rennergade]

Need a bit more context with comments

[rishabhBudhouliya]

@rennergade As per my understanding, we use

lind-wasm/src/glibc/sysdeps/unix/sysdep.h

Line 228 in 4e2fb7e

#define INLINE_SYSCALL_CALL(...) 0

to stub no op syscalls in lind-wasm typically.
However, for setgid(), we were using

lind-wasm/src/glibc/sysdeps/unix/sysv/linux/setgid.c

Lines 26 to 29 in 4e2fb7e

	#ifdef __NR_setgid32
	return INLINE_SETXID_SYSCALL (setgid32, 1, gid);
	#else
	return INLINE_SETXID_SYSCALL (setgid, 1, gid);

which returns a garbage value instead of a 0.

This PR attempts to fix the root cause of that garbage value and effectively starts returning 0 even from INLINE_SETXID_SYSCALL.

[qianxichen233]

how's INLINE_SETXID_SYSCALL related with INTERNAL_SYSCALL and INTERNAL_SYSCALL_NCS in your change?

[rishabhBudhouliya]

@qianxichen233 INLINE_SETXID_SYSCALL calls INLINE_SYSCALL which, for our i386 port, calls

lind-wasm/src/glibc/sysdeps/unix/sysv/linux/i386/sysdep.h

Lines 320 to 329 in 1bed551

	#define INTERNAL_SYSCALL(name, nr, args...) \
	({ \
	register unsigned int resultvar; \
	INTERNAL_SYSCALL_MAIN_##nr (name, args); \
	(int) resultvar; })
	#define INTERNAL_SYSCALL_NCS(name, nr, args...) \
	({ \
	register unsigned int resultvar; \
	INTERNAL_SYSCALL_MAIN_NCS_##nr (name, args); \
	(int) resultvar; })

that has an uninitialized variable called resultvar

[qianxichen233]

I looked into this a little bit, the correct call path is __setgid calls __nptl_setxid which calls INTERNAL_SYSCALL_NCS since SINGLE_THREAD_P is turned off by default in lind environment

Though the call path isn't really matter. The actual issue behind it is that INTERNAL_SYSCALL_MAIN_NCS_##nr and INTERNAL_SYSCALL_MAIN_##nr was inline assembly and was removed in early work of lind-wasm: Lind-Project/glibc@7d0f3db#diff-cb58b6549d17ee4ac47ea4b2b1f2a54df66ef06cdf611f24936b1890c813db93

In its original glibc design, INTERNAL_SYSCALL_MAIN_NCS_##nr is supposed to set the resultvar, but since INTERNAL_SYSCALL_MAIN_NCS_##nr right now resolves to nothing, resultvar is left uninitialized.

This is basically the same issue as #709, all the INTERNAL_SYSCALL family in glibc is broken and we should replace them with lind_debug_panic instead. We do not really prefer to have glibc syscall code calls into INTERNAL_SYSCALL family macros as they are all just un-handled legacy code, having a very delibrate control over all glibc syscalls is our final goal.

For this PR, I think first we shouldn't still redirect to setgid to INTERNAL_SYSCALL. make it directly return 0, or -1 with ENOSYS or whatever we like.

The fix for INTERNAL_SYSCALL can be a valid temporary fix before #709 is fixed. I'd prefer to change it to -1 by default though, but might break a lot of existing things, since previously INTERNAL_SYSCALL family is always returning a slient success for the syscall while actually not performing any action, changing to -1 might change the execution routine for a lot of code and might break something. So maybe try to make it return -1 first, and if make test or other thing breaks, then we can keep to use 0 for now

[vidyalakshmir]

@rishabhBudhouliya Could you please address Qianxi's comments?