Since appx. November, 2012, I've had 2 amd64 systems hang while spewing "ehci_idone: ex=0xffff800000...... is done!" messages to the serial console. The hangs are intermittent. The system is unresponsive to the keyboard and doesn't respond to network ping. A hardware reset is necessary to regain control.
In order to help troubleshoot, I patched /usr/src/sys/dev/usb/ehci.c to panic when the forementioned message had occurred 9 times and then built a custom kernel with EHCI_DEBUG defined. In the past day, the new panic has occurred on the same machine with both an mp and sp kernel and I have collected basic ddb information as well as crash dumps. Will the ddb results from my patch [below] help troubleshoot the hang? If so, the largish console logs, usbdevs, pcidump and acpidump are located at <http://arp.thrush.com/openbsd/ehci_idone/x4/>. NB: ehcidebug=0 in the sp session, while ehcidebug=3 or 2 in the mp session. Setting ehcidebug=3 seemed to hang but I was able to interrupt ddb, set ehcidebug=2 and continue the ddb session. I appreciate any help diagnosing this problem. Thanks, Bob Index: dev/usb/ehci.c =================================================================== RCS file: /pub2/cvsroot/OpenBSD/src/sys/dev/usb/ehci.c,v retrieving revision 1.134 diff -u -p -w -b -u -r1.134 ehci.c --- dev/usb/ehci.c 12 Jun 2013 11:42:01 -0000 1.134 +++ dev/usb/ehci.c 12 Jun 2013 12:47:18 -0000 @@ -81,6 +81,8 @@ struct cfdriver ehci_cd = { #define DPRINTF(x) do { if (ehcidebug) printf x; } while(0) #define DPRINTFN(n,x) do { if (ehcidebug>(n)) printf x; } while (0) int ehcidebug = 0; +int ehcicount = 0; +int ehcicount_max = 10; /* panic - use ddb to gather more info before restarting */ #define bitmask_snprintf(q,f,b,l) snprintf((b), (l), "%b", (q), (f)) #else #define DPRINTF(x) @@ -808,12 +810,15 @@ ehci_idone(struct ehci_xfer *ex) { int s = splhigh(); if (ex->isdone) { + if ( ++ehcicount >= ehcicount_max ) { + panic("ehci_idone: ex is done!\n"); + } splx(s); #ifdef EHCI_DEBUG - printf("ehci_idone: ex is done!\n "); + printf("ehci_idone: ex is done!ehcicount=%d\n ", ehcicount); ehci_dump_exfer(ex); #else - printf("ehci_idone: ex=%p is done!\n", ex); + printf("ehci_idone: ex=%p is done!ehcicount=%d\n", ex, ehcicount); #endif return; }
