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>>>                                            p->flags |= PF_EXITING >>>                                         exit_mm >>>                                            p->mm = NULL; >>> >>>     migrate_swap_stop >>>       __migrate_swap_task((arg->src_task, arg->dst_cpu) >>>        count_memcg_event_mm(p->mm, NUMA_TASK_SWAP)# p->mm is NULL >>> >>> Could you please help check if the following debug patch works, >> >> Attached the patch: >> >> diff --git a/kernel/sched/core.c b/kernel/sched/core.c >> index 8988d38d46a3..82fc966b390c 100644 >> --- a/kernel/sched/core.c >> +++ b/kernel/sched/core.c >> @@ -3364,7 +3364,12 @@ static void __migrate_swap_task(struct >> task_struct *p, int cpu) >>   { >>       __schedstat_inc(p->stats.numa_task_swapped); >>       count_vm_numa_event(NUMA_TASK_SWAP); >> -    count_memcg_event_mm(p->mm, NUMA_TASK_SWAP); >> +    if (unlikely(!p->mm)) { >> +        trace_printk("!! (%d %s) flags=%lx\n", p->pid, p->comm, >> +                p->flags); >> +    } else { >> +        count_memcg_event_mm(p->mm, NUMA_TASK_SWAP); >> +    } >> >>       if (task_on_rq_queued(p)) { >>           struct rq *src_rq, *dst_rq; > > I was encountering the same issue as mentioned earlier in this thread, > which has been recurring in our daily linux-next CI builds within our > virtualization CI stream where we observed this BUG appearing randomly > during the runs. > > Additionally, we were able to reproduce this issue while running the > autonuma benchmark. As mentioned earlier, the BUG would occur randomly > across iterations, typically between the 5th and 10th iterations. > > We consistently encountered this issue up to the 6.16.0-rc4- > next-20250630 build [https://git.kernel.org/pub/scm/linux/kernel/git/ > next/linux-next.git]. > > After applying the aforementioned patch ontop of next-20250630 build, I > tested it in our virtualization CI and with the autonuma benchmark > reproducer described below, and the issue no longer occurred. The patch > appears to have resolved the reported problem. > > > git clone https://github.com/pholasek/autonuma-benchmark.git > cd autonuma-benchmark > for i in $(seq 1 80); do bash ./start_bench.sh -s -t; done > Note: The server running the autonuma-benchmark must have at least two > nodes. > > If the provided fix is final, please feel free to include the following > Tested-by tag: > > Tested-by: Srikanth Aithal > Tested-by: Suneeth D > I apologize for overlooking that this was a debug patch. With this debug patch applied on top of 6.16.0-rc4-next-20250630, I am unable to reproduce the issue. However, when I revert this debug patch, I encounter the issue again on 6.16.0-rc4-next-20250630.