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* [Bug malloc/22111] malloc: per thread cache is not returned when thread exits
[not found] <bug-22111-131@http.sourceware.org/bugzilla/>
@ 2020-10-10 7:23 ` jeffy.chen@rock-chips.com
2021-06-30 7:54 ` fweimer at redhat dot com
1 sibling, 0 replies; 2+ messages in thread
From: jeffy.chen@rock-chips.com @ 2020-10-10 7:23 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=22111
JeffyChen <jeffy.chen@rock-chips.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jeffy.chen@rock-chips.com
--- Comment #12 from JeffyChen <jeffy.chen@rock-chips.com> ---
Hi guys,
It seems this this issue is still exist in some cases, for example i can repro
it with this test in glibc 2.29:
#include <pthread.h>
void *noop() { pthread_detach(pthread_self()); return NULL; }
void main() {
pthread_t id;
while(1) pthread_create(&id, NULL, noop, 0);
}
There's also another report at:
https://sourceware.org/ml/glibc-bugs/2018-01/msg00171.html
So it looks like the tcache_shutting_down is still not early enough, when we
detach a thread with no tcache allocated(like the above test), the
tcache_shutting_down would still be false:
static void
tcache_thread_shutdown (void)
{
int i;
tcache_perthread_struct *tcache_tmp = tcache;
if (!tcache)
return; <--- returned here
/* Disable the tcache and prevent it from being reinitialized. */
tcache = NULL;
tcache_shutting_down = true; <--- unreachable
And the tcache might be reinitialized later(breakpoint at later
MAYBE_INIT_TCACHE):
Thread 2 (Thread 0x7f993c61e0 (LWP 8920)):
#0 0x0000007f9d444f7c in free () from /lib/libc.so.6
#1 0x0000007f9d57a3e4 in _dl_deallocate_tls () from /lib/ld-linux-aarch64.so.1
#2 0x0000007f9d541490 in free_stacks () from /lib/libpthread.so.0
#3 0x0000007f9d541a4c in __deallocate_stack () from /lib/libpthread.so.0
#4 0x0000007f9d542984 in start_thread () from /lib/libpthread.so.0
#5 0x0000007f9d49b1fc in thread_start () from /lib/libc.so.6
This works:
+++ b/malloc/malloc.c
@@ -2958,13 +2958,14 @@ tcache_thread_shutdown (void)
{
int i;
tcache_perthread_struct *tcache_tmp = tcache;
+ tcache_shutting_down = true;
if (!tcache)
return;
/* Disable the tcache and prevent it from being reinitialized. */
tcache = NULL;
- tcache_shutting_down = true;
--
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* [Bug malloc/22111] malloc: per thread cache is not returned when thread exits
[not found] <bug-22111-131@http.sourceware.org/bugzilla/>
2020-10-10 7:23 ` [Bug malloc/22111] malloc: per thread cache is not returned when thread exits jeffy.chen@rock-chips.com
@ 2021-06-30 7:54 ` fweimer at redhat dot com
1 sibling, 0 replies; 2+ messages in thread
From: fweimer at redhat dot com @ 2021-06-30 7:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=22111
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=28028
--- Comment #13 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to JeffyChen from comment #12)
> Hi guys,
>
> It seems this this issue is still exist in some cases, for example i can
> repro it with this test in glibc 2.29:
Thanks for the report, this is now bug 28028.
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2020-10-10 7:23 ` [Bug malloc/22111] malloc: per thread cache is not returned when thread exits jeffy.chen@rock-chips.com
2021-06-30 7:54 ` fweimer at redhat dot com
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