On Fri, 8 Aug 2025 07:49:09 -0400 Khadem Ullah <14pwcse1...@uetpeshawar.edu.pk> wrote:
> The crashes are on 22.11, 23.03, 24.11, it is on all dpdk stable versions and
> 25.07 as well.
> Please first close primary testpmd before secondary testpmd application
> and try to close secondary or execute any of the following commands,
>
> "show device info all
> show port stats all
> show port xstats all
> set fwd rxonly
> set fwd txonly
> start
> etc"
>
> We are all agree that these crashes exists. First we were tried
> to prevent the crashes at PMD level, but it was not possible to
> add checks in each PMD. Then we tried to add safety checks
> in ethdev layer, and it was not suitable as with primary closing
> all reference to device information (pointers) would lead crashes.
>
> Then we agreed on secondary process monitoring for primary process exiting.
> and it is now resolved on application level, i.e. on testpmd.
>
> Now, this solution is working perfectly. We can add eal_cleanup for
> gracefull exit.
>
> Best Regards,
> Khadem
Maybe this quick picture would help explain the data structures
│
│ Huge pages (shared)
│
rte_eth_devices[] │
│
┌────────┐ │
Primary │ ┼────────┼───┐
Process │ │ │ │
┌────────┐ │ │
│ ┼────┐ │ │
│ │ │ │ │ rte_eth_dev_data
└────────┘ │ │ │ ┌─────────────────┐
│ │ │ │ │
│ │ └───────────►│ │
│ │ │
───┼─────────────►
│ │ ┌───────► │
│ │ │ │ │
│ │ │ └─────────────────┘
│ │ │
│ │ │ ┌─────────────────┐
│ │ │ │ │
└───┼────────┼───────► │
│ │ │
─────┼────────────►
rte_eth_devices │ │ ┌────► │
Secondary ┌────────┐ │ │ │ │ │
Process │ ┼─────────┼────────┘ │ └─────────────────┘
│ │ │ │
┌────────┐ │ │
│ ┼─────────┼───────────┘
│ │ │
└────────┘ │
│
