[lttng-dev] Core seen with lttng_abi_map_channel()

[Aravind HT]

Hi,

Below is a recent core that I saw. Unfortunately the code is optimized, but
still it points to a call to free(lttng_chan);

(gdb) bt
#0  0x00007f3cbb0df367 in __GI_raise (sig=sig at entry=6) at
../sysdeps/unix/sysv/linux/raise.c:55
#1  0x00007f3cbb0e233a in __GI_abort () at abort.c:89
#2  0x00007f3cbb11928c in __libc_message (do_abort=do_abort at entry=2,
fmt=fmt at entry=0x7f3cbb2158c8 "*** Error in `%s': %s: 0x%s ***\n") at
../sysdeps/posix/libc_fatal.c:175
#3  0x00007f3cbb122cbe in malloc_printerr (action=3,
str=0x7f3cbb211a87 "free(): invalid pointer", ptr=<optimized out>) at
malloc.c:4960
#4  0x00007f3cbb12349b in _int_free (av=<optimized out>, p=<optimized
out>, have_lock=0) at malloc.c:3831
#5  0x00007f3cb79551c5 in lttng_abi_map_channel () from
/var/tmp/iso-path.24284/altroot/usr/lib64/liblttng-ust.so.0
#6  0x00007f3cb79554c8 in ?? () from
/var/tmp/iso-path.24284/altroot/usr/lib64/liblttng-ust.so.0
#7  0x00007f3cb7952846 in ?? () from
/var/tmp/iso-path.24284/altroot/usr/lib64/liblttng-ust.so.0
#8  0x00007f3cb8974294 in start_thread (arg=0x7f3cb1ad7700) at
pthread_create.c:336
#9  0x00007f3cbb19413d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:109


Think we should not be freeing lttng_chan here.


https://github.com/dgoulet/lttng-ust-dev/blob/master/liblttng-ust/lttng-ust-abi.c#L516



Regards,
Aravind.
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