==9395== Memcheck, a memory error detector
==9395== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==9395== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==9395== Command: ./tcc /home/prakti/Downloads/sym_pop-oob_write.c
==9395== 
==9395== Invalid read of size 8
==9395==    at 0x40EDB3: global_identifier_push (tccgen.c:587)
==9395==    by 0x42061D: asm_label_push (tccasm.c:51)
==9395==    by 0x42061D: get_asm_sym (tccasm.c:70)
==9395==    by 0x421AFC: asm_parse_directive (tccasm.c:679)
==9395==    by 0x422EBA: tcc_assemble_internal (tccasm.c:927)
==9395==    by 0x422F81: tcc_assemble_inline (tccasm.c:995)
==9395==    by 0x423577: asm_global_instr (tccasm.c:1267)
==9395==    by 0x415694: decl0.isra.25 (tccgen.c:7164)
==9395==    by 0x41AA34: decl (tccgen.c:7383)
==9395==    by 0x41AA34: tccgen_compile (tccgen.c:275)
==9395==    by 0x4031B1: tcc_compile (libtcc.c:648)
==9395==    by 0x40478D: tcc_add_file_internal (libtcc.c:1064)
==9395==    by 0x401B95: main (tcc.c:332)
==9395==  Address 0x58d3398 is 2,376 bytes inside a block of size 4,096 free'd
==9395==    at 0x4C2FD5F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9395==    by 0x4039C8: tcc_realloc (libtcc.c:224)
==9395==    by 0x405EEB: tok_alloc_new (tccpp.c:424)
==9395==    by 0x40CF38: tccpp_new (tccpp.c:3674)
==9395==    by 0x40439A: tcc_new (libtcc.c:757)
==9395==    by 0x401A16: main (tcc.c:257)
==9395==  Block was alloc'd at
==9395==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9395==    by 0x4C2FDEF: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9395==    by 0x4039C8: tcc_realloc (libtcc.c:224)
==9395==    by 0x405EEB: tok_alloc_new (tccpp.c:424)
==9395==    by 0x40CF38: tccpp_new (tccpp.c:3674)
==9395==    by 0x40439A: tcc_new (libtcc.c:757)
==9395==    by 0x401A16: main (tcc.c:257)
==9395== 
/home/prakti/Downloads/sym_pop-oob_write.c:33: error: , expected
==9395== Invalid read of size 8
==9395==    at 0x40EE2B: sym_pop (tccgen.c:613)
==9395==    by 0x403144: tcc_compile (libtcc.c:657)
==9395==    by 0x40478D: tcc_add_file_internal (libtcc.c:1064)
==9395==    by 0x401B95: main (tcc.c:332)
==9395==  Address 0x58e73e8 is 632 bytes inside a block of size 1,162 free'd
==9395==    at 0x4C2EDEB: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9395==    by 0x40CC29: preprocess_start (tccpp.c:3604)
==9395==    by 0x40319B: tcc_compile (libtcc.c:638)
==9395==    by 0x40478D: tcc_add_file_internal (libtcc.c:1064)
==9395==    by 0x401B95: main (tcc.c:332)
==9395==  Block was alloc'd at
==9395==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==9395==    by 0x403958: tcc_malloc (libtcc.c:207)
==9395==    by 0x40397D: tcc_mallocz (libtcc.c:216)
==9395==    by 0x403EB3: tcc_open_bf (libtcc.c:576)
==9395==    by 0x4041FA: tcc_define_symbol (libtcc.c:686)
==9395==    by 0x40CC29: preprocess_start (tccpp.c:3604)
==9395==    by 0x40319B: tcc_compile (libtcc.c:638)
==9395==    by 0x40478D: tcc_add_file_internal (libtcc.c:1064)
==9395==    by 0x401B95: main (tcc.c:332)
==9395== 
==9395== Invalid write of size 8
==9395==    at 0x40EE49: sym_pop (tccgen.c:618)
==9395==    by 0x403144: tcc_compile (libtcc.c:657)
==9395==    by 0x40478D: tcc_add_file_internal (libtcc.c:1064)
==9395==    by 0x401B95: main (tcc.c:332)
==9395==  Address 0x20 is not stack'd, malloc'd or (recently) free'd
==9395== 
==9395== 
==9395== Process terminating with default action of signal 11 (SIGSEGV)
==9395==  Access not within mapped region at address 0x20
==9395==    at 0x40EE49: sym_pop (tccgen.c:618)
==9395==    by 0x403144: tcc_compile (libtcc.c:657)
==9395==    by 0x40478D: tcc_add_file_internal (libtcc.c:1064)
==9395==    by 0x401B95: main (tcc.c:332)
==9395==  If you believe this happened as a result of a stack
==9395==  overflow in your program's main thread (unlikely but
==9395==  possible), you can try to increase the size of the
==9395==  main thread stack using the --main-stacksize= flag.
==9395==  The main thread stack size used in this run was 8388608.
==9395== 
==9395== HEAP SUMMARY:
==9395==     in use at exit: 1,872,656 bytes in 70 blocks
==9395==   total heap usage: 134 allocs, 64 frees, 1,931,016 bytes allocated
==9395== 
==9395== LEAK SUMMARY:
==9395==    definitely lost: 0 bytes in 0 blocks
==9395==    indirectly lost: 0 bytes in 0 blocks
==9395==      possibly lost: 0 bytes in 0 blocks
==9395==    still reachable: 1,872,656 bytes in 70 blocks
==9395==         suppressed: 0 bytes in 0 blocks
==9395== Rerun with --leak-check=full to see details of leaked memory
==9395== 
==9395== For counts of detected and suppressed errors, rerun with: -v
==9395== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 0 from 0)