Hello,
i've got segmentation faults with every self-made program based on pthread
library in my debian-sarge guest system.
On my host there is an debian-sarge 2.6.11.6-skas3-v8-rc5 running.
for instance this simple program segfaults:
********************
#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
void * thread (void *dummy) {
for (;;) {
sleep(10);
}
}
int main () {
pthread_t tid;
if (pthread_create(&tid, NULL, thread, NULL) != 0) {
fprintf(stderr, "Error creating thread\n");
return 1;
}
sleep(100);
pthread_join(tid, NULL);
return 0;
}
********************
compiled with:
gcc -g -Wall -o threadtest thread-test.c -lpthread
strace ./threadtest returns:(last lines)
********************
open("/lib/tls/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0`Z\1\000"..., 512) =
512
fstat64(3, {st_mode=S_IFREG|0644, st_size=1254468, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x4002b000
old_mmap(NULL, 1264780, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4002c000
old_mmap(0x40156000, 36864, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3,
0x129000) = 0x40156000
old_mmap(0x4015f000, 7308, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|
MAP_ANONYMOUS, -1, 0) = 0x4015f000
close(3) = 0
set_thread_area({entry_number:-1 -> -1, base_addr:0x4002b900, limit:1048575,
seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
seg_not_present:0, useable:1}) = -1 ENOSYS (Function not implemented)
modify_ldt(1, {entry_number:0, base_addr:0x4002b900, limit:1048575,
seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1,
seg_not_present:0, useable:1},16) = 0
munmap(0x40018000, 13832) = 0
set_tid_address(0x4002b948) = 16564
rt_sigaction(SIGRTMIN, {0x400205d0, [], SA_SIGINFO}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
mmap2(NULL, 8388608, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|
MAP_ANONYMOUS, -1, 0) = 0x40161000
brk(0) = 0x804a000
brk(0x806b000) = 0x806b000
brk(0) = 0x806b000
mprotect(0x40161000, 4096, PROT_NONE) = 0
clone(child_stack=0x40960b48, flags=CLONE_VM|CLONE_FS|CLONE_FILES|
CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|
CLONE_CHILD_CLEARTID|CLONE_DETACHED, parent_tidptr=0x40960bf8,
{entry_number:0, base_addr:0x40960bb0, limit:1048575, seg_32bit:1,
contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0,
useable:1}, child_tidptr=0x40960bf8) = 16565
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({100, 0}, 0xbffff684) = ? ERESTART_RESTARTBLOCK (To be
restarted)
+++ killed by SIGSEGV +++
********************
any ideas why this happens?
Markus Schulz
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