With a amd64 kernel built from Mar 28 16:05 GMT source, I just saw: (gdb) target kvm netbsd.2.core 0xffffffff80119405 in cpu_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:671 671 dumpsys(); (gdb) bt #0 0xffffffff80119405 in cpu_reboot (howto=howto@entry=260, bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:671 #1 0xffffffff8051e392 in vpanic (fmt=fmt@entry=0xffffffff8079d3fb "trap", ap=ap@entry=0xfffffe8040cc29a0) at ../../../../kern/subr_prf.c:342 #2 0xffffffff8051e44d in panic (fmt=fmt@entry=0xffffffff8079d3fb "trap") at ../../../../kern/subr_prf.c:258 #3 0xffffffff8011ae12 in trap (frame=0xfffffe8040cc2ac0) at ../../../../arch/amd64/amd64/trap.c:298 #4 0xffffffff80100fc6 in alltraps () #5 0xffffffff8054547a in filt_sordetach (kn=0xfffffe804e698780) at ../../../../kern/uipc_socket.c:2250 #6 0xffffffff804db191 in knote_detach (kn=0xfffffe804e698780, fdp=0xfffffe806f6ba400, dofop=<optimized out>) at ../../../../kern/kern_event.c:1572 #7 0xffffffff804dc729 in kqueue_scan (kevcnt=8, keops=0xffffffff8076a620 <kevent_native_ops>, keops=0xffffffff8076a620 <kevent_native_ops>, kevbuf=0xfffffe8040cc2d18, retval=0xfffffe8040cc2eb8, tsp=0x0, ulistp=0x7f7fd05fff70, maxevents=1, fp=<optimized out>) at ../../../../kern/kern_event.c:1265 #8 kevent1 (retval=0xfffffe8040cc2eb8, fd=40, changelist=<optimized out>, nchanges=<optimized out>, eventlist=0x7f7fd05fff70, nevents=1, timeout=0x0, keops=keops@entry=0xffffffff8076a620 <kevent_native_ops>) at ../../../../kern/kern_event.c:896 #9 0xffffffff804dc8f9 in sys___kevent50 (l=<optimized out>, uap=<optimized out>, retval=<optimized out>) at ../../../../kern/kern_event.c:817 #10 0xffffffff8013572e in sy_call (rval=0xfffffe8040cc2eb8, uap=0xfffffe8040cc2f00, l=0xfffffe8132dc7180, sy=0xffffffff80a40f08 <sysent+10440>) at ../../../../sys/syscallvar.h:65 #11 sy_invoke (code=435, rval=0xfffffe8040cc2eb8, uap=0xfffffe8040cc2f00, l=0xfffffe8132dc7180, sy=0xffffffff80a40f08 <sysent+10440>) at ../../../../sys/syscallvar.h:94 #12 syscall (frame=0xfffffe8040cc2f00) at ../../../../arch/x86/x86/syscall.c:156 #13 0xffffffff80100661 in Xsyscall () (gdb) frame 5 #5 0xffffffff8054547a in filt_sordetach (kn=0xfffffe804e698780) at ../../../../kern/uipc_socket.c:2250 2250 SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); (gdb) list 2245 { 2246 struct socket *so; 2247 2248 so = ((file_t *)kn->kn_obj)->f_socket; 2249 solock(so); 2250 SLIST_REMOVE(&so->so_rcv.sb_sel.sel_klist, kn, knote, kn_selnext); 2251 if (SLIST_EMPTY(&so->so_rcv.sb_sel.sel_klist)) 2252 so->so_rcv.sb_flags &= ~SB_KNOTE; 2253 sounlock(so); 2254 } (gdb) print kn->kn_selnext $1 = {sle_next = 0x0} (gdb) print *kn $2 = {kn_link = {sle_next = 0x0}, kn_selnext = {sle_next = 0x0}, kn_tqe = { tqe_next = 0xfffffe8041910000, tqe_prev = 0xfffffe8140926600}, kn_kq = 0xfffffe8140926600, kn_kevent = {ident = 42, filter = 0, flags = 21, fflags = 0, data = 2, udata = 0}, kn_status = 1, kn_sfflags = 1, kn_sdata = 1, kn_obj = 0xfffffe8135828740, kn_fop = 0xffffffff8076ee00 <soread_filtops>, kn_kfilter = 0xffffffff80a41700 <sys_kfilters>, kn_hook = 0x0}
crash tells me that the running process were: PID LID S CPU FLAGS STRUCT LWP * NAME WAIT 19492> 36 7 1 8020000 fffffe81310c6120 mozStorage #1 19492> 18 7 3 0 fffffe8132dc7180 firefox 0 > 2 7 0 201 fffffe814e138840 idle/0 The line numbers for uipc_socket.c don't match as I have a load of printfs in there from trying to narrow down: 1) netbsd-7/i386 Issue with pflogd consuming 100% of CPU https://mail-index.netbsd.org/netbsd-users/2015/09/24/msg016939.html 2) netbsd-7/i386 pipe read returning EAGAIN https://mail-index.netbsd.org/current-users/2016/02/07/msg028841.html 3) (netbsd-current/amd64) Last version of of citrix Client core dumps https://mail-index.netbsd.org/netbsd-users/2016/02/03/msg017788.html maybe even https://mail-index.netbsd.org/current-users/2015/06/02/msg027506.html ? 4) netbsd-7 high cpu load with tcpdump (and bind) http://mail-index.netbsd.org/current-users/2016/02/26/msg028923.html 5) netbsd-7/current/amd64 dansguardian http://mail-index.netbsd.org/current-users/2016/03/02/msg028961.html Any hints / tips / guesses gratefully received! Cheers, Patrick