Date: Wed, 26 Sep 2018 02:02:15 +0300 From: Oleg Ginzburg <olevole@olevole.ru> To: freebsd-virtualization@freebsd.org, tech-kern@netbsd.org Subject: NetBSD 8.0/amd64+ bhyve (FreeBSD 12)+xhci = SIGSEGV Message-ID: <CAMsb%2Bmao2bN%2Bwxcf%2BODChPLUpABX%2Bdxq1KjQv%2BP-xjAG5AEvrg@mail.gmail.com>
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Hello. NetBSD works fine in bhyve, except for the case when the bhyve emulates eXtensible Host Controller Interface (xHCI) USB controller. ( -s 30,xhci,tablet ) Perhaps SIGSEGV of bhyve is caused by the abnormal behavior of xhci on the NetBSD guest, so I decided to write both mailing lists. LLDB output upon bhyve crash (guest screen: https://pasteboard.co/HFAqTOk.png ): https://github.com/freebsd/freebsd/blob/ebeb3285f598d6c1214c49598c951493d09e1067/usr.sbin/bhyve/pci_xhci.c#L735 Process 57083 stopped * thread #20, name = 'vcpu 0', stop reason = signal SIGSEGV: invalid address (fault address: 0x0) frame #0: 0x00000000002587d8 bhyve`pci_xhci_insert_event(sc=0x00000008010a5100, evtrb=0x00007fffddbeba78, do_intr=0) at pci_xhci.c:735 732 rts = &sc->rtsregs; 733 734 erdp = rts->intrreg.erdp & ~0xF; -> 735 erdp_idx = (erdp - rts->erstba_p[rts->er_deq_seg].qwEvrsTablePtr) / 736 sizeof(struct xhci_trb); 737 738 DPRINTF(("pci_xhci: insert event 0[%lx] 2[%x] 3[%x]\r\n" (lldb) frame variable erdp_idx (int) erdp_idx = 0 in all likelihood, the problem in the rts->erstba_p structure because when I commenting 735 line ( erdp_idx is used only in DPRINTF debug output ) the next stop when working with this structure again, e.g: Process 58354 stopped * thread #20, name = 'vcpu 0', stop reason = signal SIGSEGV: invalid address (fault address: 0x8) frame #0: 0x0000000000258881 bhyve`pci_xhci_insert_event(sc=0x00000008010a5100, evtrb=0x00007fffddbeba78, do_intr=0) at pci_xhci.c:750 747 evtrbptr = &rts->erst_p[rts->er_enq_idx]; 748 749 /* TODO: multi-segment table */ -> 750 if (rts->er_events_cnt >= rts->erstba_p->dwEvrsTableSize) { 751 DPRINTF(("pci_xhci[%d] cannot insert event; ring full\r\n", 752 __LINE__)); 753 err = XHCI_TRB_ERROR_EV_RING_FULL; What can I do to find out the reasons for this behavior? Thanks!
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