* [Bug default/27633] New: low mem memory leaks
@ 2021-03-23 11:05 vries at gcc dot gnu.org
2021-03-23 11:15 ` [Bug default/27633] " vries at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: vries at gcc dot gnu.org @ 2021-03-23 11:05 UTC (permalink / raw)
To: dwz
https://sourceware.org/bugzilla/show_bug.cgi?id=27633
Bug ID: 27633
Summary: low mem memory leaks
Product: dwz
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: default
Assignee: nobody at sourceware dot org
Reporter: vries at gcc dot gnu.org
CC: dwz at sourceware dot org
Target Milestone: ---
When building dwz with address sanitizer, we run into:
...
$ ./dwz hello -o hello.z -l0
=================================================================
==22607==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 432 byte(s) in 6 object(s) allocated from:
#0 0x7f560af846d8 in __interceptor_calloc (/usr/lib64/libasan.so.4+0xdc6d8)
#1 0x475db1 in htab_try_create /home/vries/dwz/dwz.git/hashtab.c:164
#2 0x406ed6 in read_abbrev /home/vries/dwz/dwz.git/dwz.c:1296
#3 0x42bca9 in read_debug_info /home/vries/dwz/dwz.git/dwz.c:6818
#4 0x4608cb in read_dwarf /home/vries/dwz/dwz.git/dwz.c:13706
#5 0x46ef9a in dwz /home/vries/dwz/dwz.git/dwz.c:15383
#6 0x474a27 in dwz_one_file /home/vries/dwz/dwz.git/dwz.c:16279
#7 0x475951 in main /home/vries/dwz/dwz.git/dwz.c:16450
#8 0x7f560a8f9349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Direct leak of 72 byte(s) in 1 object(s) allocated from:
#0 0x7f560af846d8 in __interceptor_calloc (/usr/lib64/libasan.so.4+0xdc6d8)
#1 0x475db1 in htab_try_create /home/vries/dwz/dwz.git/hashtab.c:164
#2 0x42a8fd in read_debug_info /home/vries/dwz/dwz.git/dwz.c:6634
#3 0x4608cb in read_dwarf /home/vries/dwz/dwz.git/dwz.c:13706
#4 0x46ef9a in dwz /home/vries/dwz/dwz.git/dwz.c:15383
#5 0x474a27 in dwz_one_file /home/vries/dwz/dwz.git/dwz.c:16279
#6 0x475951 in main /home/vries/dwz/dwz.git/dwz.c:16450
#7 0x7f560a8f9349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 4072 byte(s) in 1 object(s) allocated from:
#0 0x7f560af846d8 in __interceptor_calloc (/usr/lib64/libasan.so.4+0xdc6d8)
#1 0x475dd7 in htab_try_create /home/vries/dwz/dwz.git/hashtab.c:168
#2 0x42a8fd in read_debug_info /home/vries/dwz/dwz.git/dwz.c:6634
#3 0x4608cb in read_dwarf /home/vries/dwz/dwz.git/dwz.c:13706
#4 0x46ef9a in dwz /home/vries/dwz/dwz.git/dwz.c:15383
#5 0x474a27 in dwz_one_file /home/vries/dwz/dwz.git/dwz.c:16279
#6 0x475951 in main /home/vries/dwz/dwz.git/dwz.c:16450
#7 0x7f560a8f9349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 2928 byte(s) in 6 object(s) allocated from:
#0 0x7f560af846d8 in __interceptor_calloc (/usr/lib64/libasan.so.4+0xdc6d8)
#1 0x475dd7 in htab_try_create /home/vries/dwz/dwz.git/hashtab.c:168
#2 0x406ed6 in read_abbrev /home/vries/dwz/dwz.git/dwz.c:1296
#3 0x42bca9 in read_debug_info /home/vries/dwz/dwz.git/dwz.c:6818
#4 0x4608cb in read_dwarf /home/vries/dwz/dwz.git/dwz.c:13706
#5 0x46ef9a in dwz /home/vries/dwz/dwz.git/dwz.c:15383
#6 0x474a27 in dwz_one_file /home/vries/dwz/dwz.git/dwz.c:16279
#7 0x475951 in main /home/vries/dwz/dwz.git/dwz.c:16450
#8 0x7f560a8f9349 in __libc_start_main (/lib64/libc.so.6+0x24349)
SUMMARY: AddressSanitizer: 7504 byte(s) leaked in 14 allocation(s).
...
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* [Bug default/27633] low mem memory leaks
2021-03-23 11:05 [Bug default/27633] New: low mem memory leaks vries at gcc dot gnu.org
@ 2021-03-23 11:15 ` vries at gcc dot gnu.org
2021-03-23 11:15 ` vries at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: vries at gcc dot gnu.org @ 2021-03-23 11:15 UTC (permalink / raw)
To: dwz
https://sourceware.org/bugzilla/show_bug.cgi?id=27633
--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Focusing on line 6634, we have:
...
6631 if (unlikely (op_multifile || rd_multifile || fi_multifile ||
low_mem))
6632 {
6633 meta_abbrev_htab
6634 = htab_try_create (500, meta_abbrev_hash, meta_abbrev_eq,
6635 meta_abbrev_del);
6636 if (meta_abbrev_htab == NULL)
6637 dwz_oom ();
6638 to_free = obstack_alloc (&ob2, 1);
6639 }
...
Doing a debug session while watching meta_abbrev_htab show us the problem.
First, we alloc:
...
Old value = (htab_t) 0x0
New value = (htab_t) 0x64f5e0
read_debug_info (dso=0x64c180, kind=0, die_count=0x0) at dwz.c:6636
6636 if (meta_abbrev_htab == NULL)
...
Then, we alloc again:
...
Old value = (htab_t) 0x64f5e0
New value = (htab_t) 0x651410
read_debug_info (dso=0x64c180, kind=5, die_count=0x0) at
/home/vries/dwz/dwz.git/dwz.c:6636
6636 if (meta_abbrev_htab == NULL)
...
but this time, for .debug_types:
...
(gdb) up
#1 0x0000000000430660 in dwz (file=0x7fffffffe1d4 "hello",
outfile=0x7fffffffe1dd "hello.z", res=0x7fffffffdb80, resa=0x0, files=0x0)
at /home/vries/dwz/dwz.git/dwz.c:15391
15391 || read_debug_info (dso, DEBUG_TYPES, NULL)
...
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* [Bug default/27633] low mem memory leaks
2021-03-23 11:05 [Bug default/27633] New: low mem memory leaks vries at gcc dot gnu.org
2021-03-23 11:15 ` [Bug default/27633] " vries at gcc dot gnu.org
@ 2021-03-23 11:15 ` vries at gcc dot gnu.org
2021-03-23 13:19 ` vries at gcc dot gnu.org
2021-03-24 17:08 ` vries at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: vries at gcc dot gnu.org @ 2021-03-23 11:15 UTC (permalink / raw)
To: dwz
https://sourceware.org/bugzilla/show_bug.cgi?id=27633
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
This fixes it:
...
diff --git a/dwz.c b/dwz.c
index 4fc01a3..3dd4d5e 100644
--- a/dwz.c
+++ b/dwz.c
@@ -6628,7 +6628,8 @@ read_debug_info (DSO *dso, int kind, unsigned int
*die_count)
if (dup_htab == NULL)
dwz_oom ();
}
- if (unlikely (op_multifile || rd_multifile || fi_multifile || low_mem))
+ if (meta_abbrev_htab == NULL
+ && unlikely (op_multifile || rd_multifile || fi_multifile || low_mem))
{
meta_abbrev_htab
= htab_try_create (500, meta_abbrev_hash, meta_abbrev_eq,
...
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* [Bug default/27633] low mem memory leaks
2021-03-23 11:05 [Bug default/27633] New: low mem memory leaks vries at gcc dot gnu.org
2021-03-23 11:15 ` [Bug default/27633] " vries at gcc dot gnu.org
2021-03-23 11:15 ` vries at gcc dot gnu.org
@ 2021-03-23 13:19 ` vries at gcc dot gnu.org
2021-03-24 17:08 ` vries at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: vries at gcc dot gnu.org @ 2021-03-23 13:19 UTC (permalink / raw)
To: dwz
https://sourceware.org/bugzilla/show_bug.cgi?id=27633
--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
https://sourceware.org/pipermail/dwz/2021q1/001163.html
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* [Bug default/27633] low mem memory leaks
2021-03-23 11:05 [Bug default/27633] New: low mem memory leaks vries at gcc dot gnu.org
` (2 preceding siblings ...)
2021-03-23 13:19 ` vries at gcc dot gnu.org
@ 2021-03-24 17:08 ` vries at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: vries at gcc dot gnu.org @ 2021-03-24 17:08 UTC (permalink / raw)
To: dwz
https://sourceware.org/bugzilla/show_bug.cgi?id=27633
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #4 from Tom de Vries <vries at gcc dot gnu.org> ---
https://sourceware.org/git/?p=dwz.git;a=commit;h=58080323488c5fd34793ae8c49f214b85eabe7f3
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