https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100402
Bug ID: 100402
Summary: Crash in longjmp
Product: gcc
Version: 10.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ssbssa at yahoo dot de
Target Milestone: ---
The following example:
---------------------------------- >8 --------------------------------------
// gcc -O1 test.c
#include <setjmp.h>
static jmp_buf buf;
static bool stop = false;
void call_func(void(*func)(void))
{
func();
}
void func()
{
stop = true;
longjmp(buf, 1);
}
int main()
{
setjmp(buf);
while (!stop)
call_func(func);
return 0;
}
---------------------------------- >8 --------------------------------------
Crashes deep in longjmp():
Starting program: C:\src\tests\a.exe
gdb: unknown target exception 0xc0000028 at 0x779dd7e8
Program received signal ?, Unknown signal.
0x00000000779dd7e8 in ntdll!RtlRaiseStatus () from
C:\Windows\SYSTEM32\ntdll.dll
(gdb) bt
#0 0x00000000779dd7e8 in ntdll!RtlRaiseStatus () from
C:\Windows\SYSTEM32\ntdll.dll
#1 0x000000007797f4ec in ntdll!RtlIsDosDeviceName_U () from
C:\Windows\SYSTEM32\ntdll.dll
#2 0x000007fefe11e5a3 in msvcrt!longjmp () from C:\Windows\system32\msvcrt.dll
#3 0x000000013fe61620 in func ()
#4 0x000000013fe61627 in call_func ()
#5 0x000000013fe61664 in main ()
#6 0x000000013fe61431 in __tmainCRTStartup () at
C:/gcc/src/mingw-w64-v8.0.0/mingw-w64-crt/crt/crtexe.c:345
#7 0x000000013fe615b6 in mainCRTStartup () at
C:/gcc/src/mingw-w64-v8.0.0/mingw-w64-crt/crt/crtexe.c:220
Note: Doesn't crash with -O0, or if I change `while (!stop)` to `if (!stop)`.
And it also works fine with gcc-10.2, or if I revert both fixes [1] [2] of
PR99234.
[1]
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=49a714e59194a7c549aa6657676a1b4be4520650
[2]
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=2939b358936bb824330888def98ad848dea41483
