rtkrcv crashes on systems with uClibc-ng or musl

[sonicpp]

Hi,
rtkrcv crashes on systems using other libc than glibc (like musl or uclibc-ng). Can reproduce it on Pinephone (alpine w/ musl) and Raspberry Pi 0w (buildroot w/ both musl and uclibc-ng).

It does not crash on start, but when I connect via telnet and try to print status. It crashes in prstatus() of rtkrcv.c and I do not know why.

Maybe the stack is corrupted or something?

/Dilna/build/gnss-pi-uclibc-debug/host/bin/arm-buildroot-linux-uclibcgnueabihf-gdb -ix ~/Dilna/build/gnss-pi-uclibc-debug/staging/usr/share/buildroot/gdbinit rtkrcv
(gdb) target remote 192.168.0.196:2345                                                                                
Remote debugging using 192.168.0.196:2345                                                                             
Reading symbols from /home/jan/Dilna/build/gnss-pi-uclibc-debug/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/lib/ld-uClibc.so.0...                                                                                                      
(No debugging symbols found in /home/jan/Dilna/build/gnss-pi-uclibc-debug/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/lib/ld-uClibc.so.0)                                                                                              
0xb6eec148 in _start () from /home/jan/Dilna/build/gnss-pi-uclibc-debug/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/lib/ld-uClibc.so.0                                                                                                 
(gdb) set args -s -p 8000 -o /etc/svi-lin.conf                                                                        
(gdb) b prstatus                                                                                                      
Breakpoint 1 at 0x4a66c8: file ../rtkrcv.c, line 629.                                                                 
(gdb) c                                                                                                               
Continuing.                                                                                                           
[New Thread 269.271]                                                                                                                                                                                                                        
[Switching to Thread 269.271]                                                                                                                                                                                                               
                                                                                                                                                                                                                                            
Thread 2 "rtkrcv" hit Breakpoint 1, prstatus (vt=vt@entry=0x260cee8) at ../rtkrcv.c:629                                                                                                                                                     
629         const char *svrstate[]={"stop","run"},*type[]={"rover","base","corr"};                                                                                                                                                          
(gdb) x/50i 0x4a66c8                                                                                                                                                                                                                        
   0x4a66c8 <prstatus>: push    {r4, r5, r6, r7, r8, r9, r10, r11, lr}                                                                                                                                                                      
   0x4a66cc <prstatus+4>:       vpush   {d8-d14}                                                                                                                                                                                            
   0x4a66d0 <prstatus+8>:       sub     sp, sp, #2686976        ; 0x290000                                                                                                                                                                  
   0x4a66d4 <prstatus+12>:      sub     sp, sp, #6464   ; 0x1940                                                                                                                                                                            
   0x4a66d8 <prstatus+16>:      sub     sp, sp, #52     ; 0x34                                                                                                                                                                              
   0x4a66dc <prstatus+20>:      add     r1, sp, #6464   ; 0x1940                                                                                                                                                                            
   0x4a66e0 <prstatus+24>:      add     r1, r1, #48     ; 0x30                                                                                                                                                                              
   0x4a66e4 <prstatus+28>:      vmov    s24, r0                                                                                                                                                                                             
   0x4a66e8 <prstatus+32>:      mov     r0, r1                                                                                                                                                                                              
   0x4a66ec <prstatus+36>:      mov     r8, #0                                                                                                                                                                                              
   0x4a66f0 <prstatus+40>:      ldr     r12, [pc, #1632]        ; 0x4a6d58 <prstatus+1680>                                                                                                                                                  
   0x4a66f4 <prstatus+44>:      ldr     r2, [pc, #1632] ; 0x4a6d5c <prstatus+1684>                                                                                                                                                          
   0x4a66f8 <prstatus+48>:      add     r9, sp, #2416   ; 0x970                                                                                                                                                                             
   0x4a66fc <prstatus+52>:      sub     lr, r1, #6208   ; 0x1840                                                                                                                                                                            
   0x4a6700 <prstatus+56>:      ldr     r1, [pc, #1624] ; 0x4a6d60 <prstatus+1688>                                                                                                                                                          
   0x4a6704 <prstatus+60>:      add     r12, pc, r12
   0x4a6708 <prstatus+64>:      add     r2, pc, r2
   0x4a670c <prstatus+68>:      sub     r3, r9, #2320   ; 0x910
   0x4a6710 <prstatus+72>:      sub     r5, r9, #2144   ; 0x860
   0x4a6714 <prstatus+76>:      sub     r3, r3, #4
=> 0x4a6718 <prstatus+80>:      str     r2, [r9, #-2332]        ; 0xfffff6e4
   0x4a671c <prstatus+84>:      add     r10, r12, #184  ; 0xb8
   0x4a6720 <prstatus+88>:      add     r2, r12, #172   ; 0xac
   0x4a6724 <prstatus+92>:      add     r1, pc, r1
   0x4a6728 <prstatus+96>:      sub     r5, r5, #12
   0x4a672c <prstatus+100>:     sub     r7, r0, #6400   ; 0x1900
   0x4a6730 <prstatus+104>:     str     r1, [r9, #-2328]        ; 0xfffff6e8
   0x4a6734 <prstatus+108>:     str     r0, [sp, #36]   ; 0x24
   0x4a6738 <prstatus+112>:     ldm     r2, {r0, r1, r2}
   0x4a673c <prstatus+116>:     stm     r3, {r0, r1, r2}
   0x4a6740 <prstatus+120>:     ldm     r10!, {r0, r1, r2, r3}
   0x4a6744 <prstatus+124>:     stmia   r5!, {r0, r1, r2, r3}
   0x4a6748 <prstatus+128>:     ldm     r10, {r0, r1, r2, r3}
   0x4a674c <prstatus+132>:     add     r4, r12, #216   ; 0xd8
   0x4a6750 <prstatus+136>:     str     r7, [sp, #40]   ; 0x28
   0x4a6754 <prstatus+140>:     sub     lr, lr, #12
   0x4a6758 <prstatus+144>:     sub     r7, r7, #8
   0x4a675c <prstatus+148>:     stm     r5, {r0, r1, r2, r3}
   0x4a6760 <prstatus+152>:     str     r7, [sp, #32]
   0x4a6764 <prstatus+156>:     ldm     r4!, {r0, r1, r2, r3}
   0x4a6768 <prstatus+160>:     stmia   lr!, {r0, r1, r2, r3}
   0x4a676c <prstatus+164>:     ldm     r4!, {r0, r1, r2, r3}
   0x4a6770 <prstatus+168>:     stmia   lr!, {r0, r1, r2, r3}
   0x4a6774 <prstatus+172>:     ldr     r3, [r4]
   0x4a6778 <prstatus+176>:     ldr     r2, [sp, #40]   ; 0x28
   0x4a677c <prstatus+180>:     str     r3, [lr]
   0x4a6780 <prstatus+184>:     sub     r6, r9, #2208   ; 0x8a0
   0x4a6784 <prstatus+188>:     ldr     r3, [sp, #32]
   0x4a6788 <prstatus+192>:     add     r12, r12, #252  ; 0xfc
   0x4a678c <prstatus+196>:     sub     r6, r6, #12
(gdb) bt
#0  0x004a6718 in prstatus (vt=0xb6a6f640, vt@entry=0x260cee8) at ../rtkrcv.c:629
#1  0x004aad40 in cmd_status (vt=<optimized out>, narg=1, args=0xb6cff7cc) at ../rtkrcv.c:1054
#2  con_thread (arg=0x0) at ../rtkrcv.c:1396
#3  0xb6eb812c in start_thread () from /home/jan/Dilna/build/gnss-pi-uclibc-debug/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/lib//libc.so.0
#4  0xb6e67a04 in clone () from /home/jan/Dilna/build/gnss-pi-uclibc-debug/host/arm-buildroot-linux-uclibcgnueabihf/sysroot/lib//libc.so.0