Re: [Crash-utility] WARNING: malloc/free mismatch
On Thu, 2019-04-18 at 15:02 +0100, Pierguido Lambri wrote:
Hello,
Today while I was looking into a vmcore, I got suddenly the message
in $SUBJECT.
It started after I did a search into the process stack pages (search
-t)
and for each command I run afterwards I kept getting that message.
For example:
$ retrace-server-interact 603967269 crash
...
crash> search -t ffff88040a0d5280
search: invalid list entry: 0
search: invalid list entry: 0
search: invalid list entry: 0
PID: 606 TASK: ffff88082d226eb0 CPU: 5 COMMAND: "xfsaild/dm-0"
ffff88083ff5b948: ffff88040a0d5280
ffff88083ff5b990: ffff88040a0d5280
ffff88083ff5baa8: ffff88040a0d5280
ffff88083ff5baf0: ffff88040a0d5280
ffff88083ff5bcf0: ffff88040a0d5280
ffff88083ff5bd38: ffff88040a0d5280
ffff88083ff5bd98: ffff88040a0d5280
WARNING: malloc/free mismatch (29/32)
crash> ps -m | grep UN
[ 0 00:00:00.146] [UN] PID: 1811 TASK: ffff880c17bd1fa0 CPU:
1 COMMAND: "cp"
WARNING: malloc/free mismatch (29/32)
I guess this comes from a possible corrupted vmcore (I just got it
from this vmcore),
but I wonder why every new command keeps returning the same message.
Thanks,
Pier
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FWIW, I just pulled this up after plambri pinged me. This is the
backtrace that is being hit though I've not dug in more:
Breakpoint 3, do_list (ld=0x7ffffffea6c0) at tools.c:3820
3820 error(INFO, "\ninvalid list entry:
0\n");
(gdb) list
3815 return -1;
3816 }
3817
3818 if (next == 0) {
3819 if (ld->flags & LIST_HEAD_FORMAT) {
3820 error(INFO, "\ninvalid list entry:
0\n");
3821 if (close_hq_on_return)
3822 hq_close();
3823 return -1;
3824 }
(gdb) bt
#0 do_list (ld=0x7ffffffea6c0) at tools.c:3820
#1 0x000000000047ec82 in dump_vmap_area (vi=0x7ffffffed0d0) at memory.c:8724
#2 dump_vmlist (vi=0x7ffffffed0d0) at memory.c:8590
#3 0x000000000047f3eb in last_vmalloc_address () at memory.c:16792
#4 0x0000000000515e6b in x86_64_get_kvaddr_ranges (vrp=0x7fffffffd340) at x86_64.c:8706
#5 0x000000000049c6ae in cmd_search () at memory.c:13988
#6 0x0000000000465f9c in exec_command () at main.c:879
#7 0x00000000004661ca in main_loop () at main.c:826
#8 0x00000000006b21a3 in captured_command_loop (data=<value optimized out>) at
main.c:258
#9 0x00000000006b0a8b in catch_errors (func=0x6b2190 <captured_command_loop>,
func_args=0x0, errstring=0x90c106 "", mask=6) at exceptions.c:557
#10 0x00000000006b3076 in captured_main (data=<value optimized out>) at main.c:1064
#11 0x00000000006b0a8b in catch_errors (func=0x6b22b0 <captured_main>,
func_args=0x7fffffffe2e0, errstring=0x90c106 "", mask=6) at exceptions.c:557
#12 0x00000000006b1fa4 in gdb_main (args=<value optimized out>) at main.c:1079
#13 0x00000000006b1fde in gdb_main_entry (argc=<value optimized out>, argv=<value
optimized out>) at main.c:1099
#14 0x0000000000467030 in main (argc=3, argv=0x7fffffffe458) at main.c:707