On 01/20/2014 08:31 PM, Jiri Slaby wrote:
> On 01/17/2014 08:09 PM, Dave Jones wrote:
>> On Wed, Jan 15, 2014 at 11:37:57PM +0100, Jiri Slaby wrote:
>> > Hi Dave,
>> >
>> > I see lots of $SUBJ generated by the current snapshot of trinity.
>> > 0x4120ae below is free in the loop in post_move_pages. So this is
>> > perhaps introduced with one of:
>> > commit ae3b98fcbf52c808b0a3eb4eb5311c9fdf433f55
>> > Author: Dave Jones <davej@xxxxxxxxxx>
>> > Date: Wed Jan 8 11:08:22 2014 -0500
>> >
>> > only allocate page_types array once
>> >
>> > commit 2a749813619348b3bfd144fe04488f698d83accc
>> > Author: Dave Jones <davej@xxxxxxxxxx>
>> > Date: Tue Jan 7 12:11:11 2014 -0500
>> >
>> > teach move_pages about the maps list
>> >
>> >
>> > Any ideas?
>>
>> I rewrote a bunch of that code a few days ago, are you still seeing it ?
>> I'm not able to reproduce it here. A run with -c move_pages runs and runs.
>
> Yeah, I still see it with the current snapshot. But, not with move_pages
> anymore, it seems. There had to be more sources, the current one is
> (with -x move_pages):
> *** Error in `trinity': double free or corruption (top):
> 0x00000000014f9bc0 ***
> ======= Backtrace: =========
> /lib64/libc.so.6(+0x740af)[0x7f0c48ba30af]
> /lib64/libc.so.6(+0x798de)[0x7f0c48ba88de]
> /lib64/libc.so.6(+0x7a5e6)[0x7f0c48ba95e6]
> trinity[0x40abc8]
> trinity[0x40dabc]
> trinity[0x40338a]
> trinity[0x40704c]
> trinity[0x402c47]
> /lib64/libc.so.6(__libc_start_main+0xf5)[0x7f0c48b50b15]
> trinity[0x402f13]
>
> The topmost trinity item 0x40abc8 is "entry->post(childno)". There seems
> to be a lost/optimized-out frame between this call and libc :/.
Ok, -Og looks better:
/lib64/libc.so.6(+0x740af)[0x7f4192eba0af]
/lib64/libc.so.6(+0x798de)[0x7f4192ebf8de]
/lib64/libc.so.6(+0x7a5e6)[0x7f4192ec05e6]
../trinity/trinity[0x410fa4]
../trinity/trinity[0x40a02f]
../trinity/trinity[0x40cf47]
../trinity/trinity[0x402c3c]
../trinity/trinity[0x4060de]
../trinity/trinity[0x4065df]
../trinity/trinity[0x406700]
../trinity/trinity[0x40bd0c]
/lib64/libc.so.6(__libc_start_main+0xf5)[0x7f4192e67b15]
../trinity/trinity[0x402779]
(gdb) l * 0x410fa4
0x410fa4 is in post_modify_ldt (syscalls/modify_ldt.c:62).
57
58 ptr = (void *) shm->scratch[childno];
59
60 if (ptr != NULL)
61 free(ptr);
62 }
63
64 struct syscallentry syscall_modify_ldt = {
65 .name = "modify_ldt",
66 .num_args = 3,
--
js
suse labs
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