Bug#200351: set/longjump issue?
I never looked into set/longjmp and am not able to read
mips-assembler, but I guess the following means that
set/longjmp is broken. Branden, could you test the program
on necrotic to verify this might be the cause there, too?
The following is what I think dpkg is doing there without
anything unrelated (A is standard_startup and B is badusage):
-------------------test.c------------
#include <stdio.h>
#include <setjmp.h>
void A(jmp_buf *j) {
int v;
printf("[A\n");
v = setjmp(*j);
printf("A: setjmp returned %d\n",v);
printf("A]\n");
}
void B(jmp_buf *j) {
printf("[B\n");
longjmp(*j,1);
printf("B]\n");
}
int main() {
jmp_buf j;
printf("[main\n");
A(&j);
printf("...main...\n");
B(&j);
printf("main]\n");
return 0;
}
-------------------------------------------------
-----------output of this is---------------------
[main
[A
A: setjmp returned 0
A]
...main...
[B
Segmentation fault
-------------------------------------------------
------------An gdb session-----------------------
GNU gdb 5.3.90_2003-08-24-cvs-debian
Copyright 2003 Free Software Foundation, Inc.
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This GDB was configured as "mips-linux"...
(gdb) b main
Breakpoint 1 at 0x400a3c: file test.c, line 22.
(gdb) r
Starting program: /home/chroot/dpkg/test
Breakpoint 1, main () at test.c:22
22 printf("[main\n");
(gdb) n
23 A(&j);
(gdb) s
A (j=0x7fff7cf8) at test.c:7
7 printf("[A\n");
(gdb) n
8 v = setjmp(*j);
(gdb) n
9 printf("A: setjmp returned %d\n",v);
(gdb) bt
#0 A (j=0x7fff7cf8) at test.c:9
#1 0x00400a70 in main () at test.c:23
(gdb) p *j
$1 = {{__jmpbuf = {{__pc = 0x4008fc, __sp = 0x7fff7c60, __regs = {4197264,
2147450452, 4197104, 1, 4196888, 2147447412, -4, 2147443240},
__fp = 0x7fff7c60, __gp = 0x2ad09610, __fpc_csr = 4, __fpregs = {
-nan(0xfffffffffffff), -nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff)}}}, __mask_was_saved = 0, __saved_mask = {
__val = {0, 0, 0, 718312976, 0, 1, 718312976, 716524848, 716524824, 0,
0, 268468272, 0, 4197264, 2147450452, 268468272, 4195888, 716282944,
718312976, 718312976, 0, 268468272, 4197264, 268468272, 4197160,
716313760, 0, 0, 0, 268468272, 716282968, 4197264}}}}
(gdb) n
10 printf("A]\n");
(gdb) n
11 }
(gdb) n
main () at test.c:24
24 printf("...main...\n");
(gdb) n
25 B(&j);
(gdb) s
B (j=0x7fff7cf8) at test.c:14
14 printf("[B\n");
(gdb) n
15 longjmp(*j,1);
(gdb) bt
#0 B (j=0x7fff7cf8) at test.c:15
#1 0x00400aac in main () at test.c:25
(gdb) p *j
$2 = {{__jmpbuf = {{__pc = 0x4008fc, __sp = 0x7fff7c60, __regs = {4197264,
2147450452, 4197104, 1, 4196888, 2147447412, -4, 2147443240},
__fp = 0x7fff7c60, __gp = 0x2ad09610, __fpc_csr = 4, __fpregs = {
-nan(0xfffffffffffff), -nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff)}}}, __mask_was_saved = 0, __saved_mask = {
__val = {0, 0, 0, 718312976, 0, 1, 718312976, 716524848, 716524824, 0,
0, 268468272, 0, 4197264, 2147450452, 268468272, 4195888, 716282944,
718312976, 718312976, 0, 268468272, 4197264, 268468272, 4197160,
716313760, 0, 0, 0, 268468272, 716282968, 4197264}}}}
(gdb) s
A (j=0x7fff7cf8) at test.c:9
9 printf("A: setjmp returned %d\n",v);
(gdb) bt
#0 A (j=0x7fff7cf8) at test.c:9
#1 0x00400b90 in __libc_csu_init ()
(gdb) p *j
$3 = {{__jmpbuf = {{__pc = 0x4008fc, __sp = 0x7fff7c60, __regs = {4197264,
2147450452, 4197104, 1, 4196888, 2147447412, -4, 2147443240},
__fp = 0x7fff7c60, __gp = 0x2ad09610, __fpc_csr = 4, __fpregs = {
-nan(0xfffffffffffff), -nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff), -nan(0xfffffffffffff),
-nan(0xfffffffffffff)}}}, __mask_was_saved = 0, __saved_mask = {
__val = {0, 0, 0, 718312976, 0, 1, 718312976, 716524848, 716524824, 0,
0, 268468272, 0, 4197264, 2147450452, 268468272, 4195888, 716282944,
718312976, 718312976, 0, 268468272, 4197264, 268468272, 4197160,
716313760, 0, 0, 0, 268468272, 716282968, 4197264}}}}
(gdb) s
Program received signal SIGSEGV, Segmentation fault.
A (j=0x7fff7cf8) at test.c:9
9 printf("A: setjmp returned %d\n",v);
(gdb) bt
#0 A (j=0x7fff7cf8) at test.c:9
#1 0x00400b90 in __libc_csu_init ()
(gdb) c
Continuing.
Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb) q
-------------------------------------------------
This system is:
Linux d03 2.4.19-r5k-ip22 #1 Wed Apr 9 13:23:23 CEST 2003 mips GNU/Linux
ii libc6 2.3.2-6 GNU C Library: Shared libraries and Timezone
ii gcc 3.3.1-2 The GNU C compiler.
system type : SGI Indy
processor : 0
cpu model : R5000 V1.0 FPU V1.0
BogoMIPS : 149.50
byteorder : big endian
wait instruction : yes
microsecond timers : yes
tlb_entries : 48
extra interrupt vector : no
hardware watchpoint : no
VCED exceptions : not available
VCEI exceptions : not available
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