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[Bug runtime/11898] New: cannot unwind through some glibc functions
- From: "mjw at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 10 Aug 2010 11:07:08 -0000
- Subject: [Bug runtime/11898] New: cannot unwind through some glibc functions
- Reply-to: sourceware-bugzilla at sourceware dot org
There seems to be some problem unwinding through some glibc/libpthread functions.
$ cat foo.c
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
void foo(int n)
{
printf("foo %d\n", n);
if (n == 0)
{
puts("trying to get mutex");
pthread_mutex_lock(&m);
puts("got it...");
sleep(1);
exit(0);
}
foo(--n);
}
void* run_thread(void* v)
{
foo(5);
}
int main()
{
puts("go main!");
pthread_t th;
// Take lock, so thread doesn't get it immediately.
pthread_mutex_lock(&m);
pthread_create(&th, 0, &run_thread, 0);
sleep(1);
pthread_mutex_unlock(&m);
for(;;) ;
}
$ gcc -g -o foo foo.c -lpthread
$ stap -d ./foo --ldd -e \
'probe syscall.write,syscall.exit,syscall.futex,syscall.nanosleep
{ if (pid() == target()) { log(name); print_ubacktrace(); } }' \
-c ./foo
futex
0x300300579e : __pthread_initialize_minimal+0xae/0x3a0 [libpthread-2.12.so]
0x30030051c9 : _init+0x9/0x480 [libpthread-2.12.so]
futex
0x30030057ee : __pthread_initialize_minimal+0xfe/0x3a0 [libpthread-2.12.so]
0x30030051c9 : _init+0x9/0x480 [libpthread-2.12.so]
nanosleep
0x30028a6b2d : __nanosleep_nocancel+0x24/0x57 [libc-2.12.so]
0x30028a69a0 : sleep+0xe0/0x1e0 [libc-2.12.so]
0x4007b7 : main+0x41/0x5a [foo]
0x300281ec5d : __libc_start_main+0xfd/0x1d0 [libc-2.12.so]
0x400639 : _start+0x29/0x2c [foo]
futex
0x300300e034 : __lll_lock_wait+0x24/0x30 [libpthread-2.12.so]
0x3003009345 : _L_lock_868+0xf/0x1b [libpthread-2.12.so]
futex
0x300300e1b5 : __lll_unlock_wake+0x25/0x30 [libpthread-2.12.so]
0x300300a707 : _L_unlock_657+0xf/0x28 [libpthread-2.12.so]
nanosleep
0x30028a6b2d : __nanosleep_nocancel+0x24/0x57 [libc-2.12.so]
0x30028a69a0 : sleep+0xe0/0x1e0 [libc-2.12.so]
0x400744 : foo+0x50/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x400774 : run_thread+0x16/0x18 [foo]
0x30030077e1 : start_thread+0xd1/0x3d4 [libpthread-2.12.so]
0x30028e151d : __clone+0x6d/0x90 [libc-2.12.so]
go main!
foo 5
foo 4
foo 3
foo 2
foo 1
foo 0
trying to get mutex
got it...
write
0x30028d422d : __write_nocancel+0x24/0x57 [libc-2.12.so]
0x30028713c3 : _IO_file_write@@GLIBC_2.2.5+0x43/0xa0 [libc-2.12.so]
exit
0x4007c1 : main+0x4b/0x5a [foo]
exit
0x30028a6e58 : _exit+0x38/0x50 [libc-2.12.so]
0x3002835f92 : exit+0x92/0x130 [libc-2.12.so]
0x40074e : foo+0x5a/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x40075c : foo+0x68/0x6a [foo]
0x400774 : run_thread+0x16/0x18 [foo]
0x30030077e1 : start_thread+0xd1/0x3d4 [libpthread-2.12.so]
0x30028e151d : __clone+0x6d/0x90 [libc-2.12.so]
WARNING: Number of errors: 0, skipped probes: 12
--
Summary: cannot unwind through some glibc functions
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap at sources dot redhat dot com
ReportedBy: mjw at redhat dot com
http://sourceware.org/bugzilla/show_bug.cgi?id=11898
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