With a fairly recent -current kernel qemu sleeps in "devdrn" state and is unkillable. /proc doesn't have qemu's pid entry but it does show up in a ps listing! This bug is not 100% repeatable but close enough. AFAIK this problem appears only when kqemu is used with qemu. This refcounting related problem has been reported for a number of other devices. In one such thread (on cvs-all, Subject: Re: cvs commit: src/sys/kern kern_conf.c) Tai-hwa Liang has analyzed the problem and suggested a workaround for a couple of devices. Rather than mucking with all the device drivers, I hope a global fix is possible. Perhaps the original fix by Tor Egge is not the only way to fix the bug? I haven't analyzed the problem so likely I am talking through my hat. "You are in a maze of twisty little passages, all alike" _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"

> bakul> With a fairly recent -current kernel qemu sleeps in "devdrn" > bakul> state and is unkillable. /proc doesn't have qemu's pid entry > bakul> but it does show up in a ps listing! This bug is not 100% > bakul> repeatable but close enough. AFAIK this problem appears only > bakul> when kqemu is used with qemu. > > Though I'm not using qemu, I met similar problem with portupgrade. > The portupgrade sleeps in "devdrm" state. > Don't you set kern.pts.enable to 1? It seems the problem doesn't > occur when kern.pts.enable=0. I tried that but the problem remained. The following "fixed" it but I don't trust it is the right fix. IMHO destroy_dev() needs to do dev_relthread() or we need to figure out why si_threadcount is > 0 and fix that so that we don't have to go fix all the drivers. --- kqemu-freebsd.c-old Thu Nov 19 08:36:25 2006 +++ kqemu-freebsd.c Mon Nov 20 01:05:56 2006 @@ -321,6 +321,7 @@ #if __FreeBSD_version >= 500000 dev->si_drv1 = NULL; TAILQ_REMOVE(&kqemuhead, ks, kqemu_ent); + dev_relthread(dev); destroy_dev(dev); #endif free(ks, M_KQEMU); _______________________________________________ freebsd-current@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"