Re: kern/53066: nearly reproducable softint panic on shutdown

[Martin Husemann <martin%duskware.de@localhost>]

The following reply was made to PR kern/53066; it has been noted by GNATS.

From: Martin Husemann <martin%duskware.de@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: jdolecek%NetBSD.org@localhost
Subject: Re: kern/53066: nearly reproducable softint panic on shutdown
Date: Mon, 23 Apr 2018 13:53:00 +0200

 On Mon, Apr 23, 2018 at 11:35:00AM +0000, Jaromír Dole?ek wrote:
 >  Can you please check backtrace for reboot command, to see what in
 >  particular triggered the interrupt? It was waiting on xscmd for my
 >  sd(4) case, might be something else for yours.
 
 Sure:
 
 db{0}> trace/a ffffe4042bba04e0
 trace: pid 37 lid 1 at 0xffff800144becd70
 sleepq_block() at netbsd:sleepq_block+0x91
 cv_wait() at netbsd:cv_wait+0xfb
 kthread_join() at netbsd:kthread_join+0x89
 audiodetach() at netbsd:audiodetach+0xcd
 config_detach() at netbsd:config_detach+0x121
 config_detach_all() at netbsd:config_detach_all+0x97
 cpu_reboot() at netbsd:cpu_reboot+0x19a
 sys_reboot() at netbsd:sys_reboot+0x75
 syscall() at netbsd:syscall+0x208
 
 Nothing related to USB or umass.
 
 >  It's very strange that interrupt for xhci() would be triggered when
 >  both child busses are already detached.
 
 Yes, but that is what is happening:
 
 [   1.1321399] xhci0 at pci4 dev 0 function 0: vendor 1033 product 0194 (rev. 0x03)
 [   1.1321399] xhci0: interrupting at ioapic0 pin 18
 [   1.1321399] usb0 at xhci0: USB revision 3.0
 [   1.1321399] usb1 at xhci0: USB revision 2.0
 ..
 [   1.1321399] fwohci0: BUS reset
 [   1.1321399] fwohci0: node_id=0xc800ffc0, gen=1, CYCLEMASTER mode
 [   1.1321399] ieee1394if0: 1 nodes, maxhop <= 0 cable IRM irm(0) (me)
 [   1.1321399] ieee1394if0: bus manager 0
 [   2.0103103] uhub0 at usb0: NetBSD (0000) xHCI Root Hub (0000), class 9/0, rev 3.00/1.00, addr 0
 [   2.1127363] uhub1 at usb1: NetBSD (0000) xHCI Root Hub (0000), class 9/0, rev 2.00/1.00, addr 0
 [   2.8278330] uhub2 at usb3: NetBSD (0000) EHCI root hub (0000), class 9/0, rev 2.00/1.00, addr 1
 ..
 # reboot
 reboot: rebooted by root
 [  44.5996539] syncing disks... done
 [  44.6396593] uhub1: detached
 [  44.6696670] uhub0: detached
 [  44.6996751] atabus0: detached
 [  44.7396859] cd0: detached
 [  44.7696940] usb1: detached
 [  44.7997124] usb0: detached
 [  44.8297205] atabus1: detached
 [  44.8697210] atapibus0: detached
 [  44.9097317] wd0: detached
 [  44.9397399] uhub6: detached
 [  44.9697480] uhub5: detached
 [  44.9997560] uhub4: detached
 [  45.0397668] uhub3: detached
 [  45.0697749] uhub2: detached
 [  45.0997830] spkr1: detached
 [  45.1397938] Skipping crash dump on recursive panic
 [  45.1397938] panic: kernel diagnostic assertion "sc->sc_child || sc->sc_child2" failed: file "../../../../dev/usb/xhci.c", line 1239 
 [  45.1397938] cpu0: Begin traceback...
 [  45.1397938] vpanic() at netbsd:vpanic+0x16f
 [  45.1397938] ch_voltag_convert_in() at netbsd:ch_voltag_convert_in
 [  45.1397938] xhci_intr() at netbsd:xhci_intr+0xd4
 [  45.1397938] intr_biglock_wrapper() at netbsd:intr_biglock_wrapper+0x36
 [  45.1397938] Xhandle_ioapic_level1() at netbsd:Xhandle_ioapic_level1+0x6a
 [  45.1397938] --- interrupt ---
 [  45.1397938] x86_pause() at netbsd:x86_pause
 [  45.1397938] callout_softclock() at netbsd:callout_softclock+0x41a
 [  45.1397938] softint_dispatch() at netbsd:softint_dispatch+0xee
 [  45.1397938] DDB lost frame for netbsd:Xsoftintr+0x4f, trying 0xffff80013d2db0f0
 [  45.1397938] Xsoftintr() at netbsd:Xsoftintr+0x4f
 
 
 
 Martin