Hi list, It seems there is memory overwrite in our plugin which corrupts the memory, after fix that, the deadloop vanished.
Zhang Dongya via lists.fd.io <[email protected]> 于2022年7月6日周三 15:52写道： > Hi list, > > Recently I encountered a deadloop in 1 master + 1 worker mode of vpp(also > happens in 1 master 0 worker mode) when I do some vpp (based on vpp 21.10) > configuration through govpp. > > The thread stats in gdb is: > (gdb) info threads > Id Target Id Frame > * 1 Thread 0x7f735c3287c0 (LWP 274213) "vpp_main" > internal_mallinfo (m=0x7f731c227040) at > /home/fortitude/glx/vpp/src/vppinfra/dlmalloc.c:2100 > 2 Thread 0x7f73127d2700 (LWP 274214) "eal-intr-thread" > 0x00007f735c5f449e in epoll_wait (epfd=16, events=0x7f73127d1d30, > maxevents=7, timeout=-1) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30 > 3 Thread 0x7f7311fd1700 (LWP 274215) "vpp_wk_0" > 0x00007f735c5d774b in sched_yield () at > ../sysdeps/unix/syscall-template.S:78 > > From what I observed, it is the inner loop (segment_holds) become a dead > loop, and I still > have not found the reason (see bottom of the mail.) > > there is old mail https://lists.fd.io/mt/89947053/675661 in this list > report the same issue, > but no answer yet and I can't reply to that thread, so I create this one. > > Hope someone can give some clue on this. > > static struct dlmallinfo internal_mallinfo(mstate m) { > struct dlmallinfo nm = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; > ensure_initialization(); > if (!PREACTION(m)) { > check_malloc_state(m); > if (is_initialized(m)) { > size_t nfree = SIZE_T_ONE; /* top always free */ > size_t mfree = m->topsize + TOP_FOOT_SIZE; > size_t sum = mfree; > msegmentptr s = &m->seg; > while (s != 0) { > mchunkptr q = align_as_chunk(s->base); > while (segment_holds(s, q) && > q != m->top && q->head != FENCEPOST_HEAD) { > size_t sz = chunksize(q); > sum += sz; > if (!is_inuse(q)) { > mfree += sz; > ++nfree; > } > q = next_chunk(q); > } > s = s->next; > } > > > >
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