[smartmontools-support] smartctl bug report

[Christian Franke]

Hi,

j2spring wrote:
> I have two NVMe . One encounters errors when using version 7.4, while 
> the other encounters errors when using version 7.5.
>
> But no matter it's version 7.4 or 7.5, just adding one line of code 
> can solve the problem. I don't know why.
>
> // Main program
> int main(int argc, char **argv)
> {
> *pout(" ");  //fix bug*
>
>   int status;
>   bool badcode = false;
> ....................
> *
> *
> *
> *
> =====================================7.4=====================================
> *smartctl -j -a /dev/nvme0*
> {
>   "json_format_version": [
>     1,
>     0
>   ],
>   "smartctl": {
>     "version": [
>       7,
>       4
>     ],
> ...
>   "local_time": {
>     "time_t": 1755910276,
>     "asctime": "Sat Aug 23 08:51:16 2025 CST"
>   },
>   "device": {
>     Smartctl: Exception: json.cpp(535): Assertion failed: is_obj == 
> !p2->key.empty()
> Please inform smartmontools-support at listi.jpberlin.de 
> <mailto:smartmontools-support at listi.jpberlin.de>, including output of 
> smartctl -V.
> free(): invalid pointer
> Aborted (core dumped)
>
>
> *smartctl -V -j -a /dev/nvme0*
> smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.8.0-71-generic] (local 
> build)
> ...
> smartmontools release 7.4 dated 2023-08-01 at 10:59:45 UTC
> smartmontools SVN rev 5530 dated 2023-08-01 at 11:00:21
> smartmontools build host: x86_64-pc-linux-gnu
> smartmontools build with: C++11, GCC 13.2.0
> smartmontools configure arguments: [hidden in reproducible builds]
> reproducible build SOURCE_DATE_EPOCH: 1712593173 (2024-04-09 00:19:33)
>
>
> =====================================7.5=====================================
> ./smartctl -j -a /dev/nvme1
> Fatal glibc error: malloc.c:2599 (sysmalloc): assertion failed: 
> (old_top == initial_top (av) && old_size == 0) || ((unsigned long) 
> (old_size) >= MINSIZE && prev_inuse (old_top) && ((unsigned long) 
> old_end & (pagesize - 1)) == 0)
> Aborted (core dumped)
>
> smartctl 7.5 2025-04-30 r5714 [x86_64-linux-6.8.0-71-generic] (local 
> build)
> ...
> smartmontools release 7.5 dated 2025-04-30 at 07:42:55 UTC
> smartmontools SVN rev 5714 dated 2025-04-30 at 07:43:44
> smartmontools build host: x86_64-pc-linux-gnu
> smartmontools build with: C++11, GCC 13.3.0
> smartmontools configure arguments: [no arguments given]
>
>

Thanks for the report. I could not reproduce this and do not remember 
any similar report.

Are the above smartctl binaries from a Linux distribution or build locally?

If possible, please try whether the problem persists if:

- smartctl from a recent CI build is used:
https://github.com/smartmontools/smartmontools-builds/releases

- smartctl 7.4 and 7.5 are rebuild without optimization:
./configure CXXFLAGS=-g

-- 
Thanks,
Christian