This is current/i386 on an ALIX - dmesg below It's my home wifi router via athn(4).
It seems that changing the wpakey causes a panic if there are wifi clients associated. After I tweak the hostname.athn0 to used the new wpakey, # cat /etc/hostname.athn0 inet 192.168.33.1 255.255.255.0 NONE media autoselect mediaopt hostap mode 11g chan 11 nwid stare.cz wpakey PASSWORDHERE this is what happens: # sh -x /etc/netstart athn0 + set +o sh + id -u + let 0 != 0 + . /etc/rc.d/rc.subr + FUNCS_ONLY=1 + _rc_actions=start stop restart reload check + readonly _rc_actions + [ -n 1 ] + return + _rc_parse_conf + PRINT_ONLY=false + V4_DHCPCONF=false + V6_AUTOCONF=false + getopts :n opt + shift 0 + false + false p sysctl -q net.inet6.ip6.soiikey=7ba282b71ed026ff4cc964c9e57a0e71 + let 1 > 0 + aifstart athn0 nic: ieee80211_encrypt: key unset for sw crypto: 0 Stopped at db_enter+0x4: popl %ebp TID PID UID PRFLAGS PFLAGS CPU COMMAND *402536 42511 0 0x3 0 0 ifconfig db_enter() at db_enter+0x4 panic(d0b780c2) at panic+0xcc ieee80211_encrypt(d193e030,d195c000,d193eb00) at ieee80211_encrypt+0x70 ar5008_tx(d193e000,d195c000,d1990000,2) at ar5008_tx+0x9b ar5008_swba_intr(d193e000) at ar5008_swba_intr+0x238 ar5008_intr(d193e000) at ar5008_intr+0x12f intr_handler(f372944c,d1935480) at intr_handler+0x18 Xintr_legacy9_untramp() at Xintr_legacy9_untramp+0xf7 end of kernel https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb> trace db_enter() at db_enter+0x4 panic(d0b780c2) at panic+0xcc ieee80211_encrypt(d193e030,d195c000,d193eb00) at ieee80211_encrypt+0x70 ar5008_tx(d193e000,d195c000,d1990000,2) at ar5008_tx+0x9b ar5008_swba_intr(d193e000) at ar5008_swba_intr+0x238 ar5008_intr(d193e000) at ar5008_intr+0x12f intr_handler(f372944c,d1935480) at intr_handler+0x18 Xintr_legacy9_untramp() at Xintr_legacy9_untramp+0xf7 end of kernel ddb> ps PID TID PPID UID S FLAGS WAIT COMMAND *42511 402536 16918 0 7 0x3 ifconfig 16918 65954 7176 0 3 0x10008b pause sh 7176 195115 1 0 3 0x10008b pause ksh 39636 276573 1 0 3 0x100098 poll cron 50319 116399 67423 74 3 0x100092 bpf pflogd 67423 115038 1 0 3 0x80 netio pflogd 6429 504036 1 79 3 0x100090 kqread tftpd 89081 471963 97968 95 3 0x100092 kqread smtpd 69172 235576 97968 103 3 0x100092 kqread smtpd 93551 495188 97968 95 3 0x100092 kqread smtpd 48333 425981 97968 95 3 0x100092 kqread smtpd 74393 225787 97968 95 3 0x100092 kqread smtpd 23071 274116 97968 95 3 0x100092 kqread smtpd 97968 252852 1 0 3 0x100080 kqread smtpd 54496 519475 1 77 3 0x100090 poll dhcpd 83016 322113 1 0 3 0x80 select sshd 55084 409085 1 0 3 0x100080 poll ntpd 19536 72605 9702 83 3 0x100092 poll ntpd 9702 89424 1 83 3 0x100092 poll ntpd 82303 414616 1 53 3 0x90 kqread unbound 80058 460534 32429 97 3 0x100090 kqread nsd -32429or193013 94599 97 3 0x100090 poll nsd 94599 500502 1 97 3 0x100090 kqread nsd 81325 222879 42514 74 3 0x100092 bpf pflogd 42514 289357 1 0 3 0x80 netio pflogd 57711 190343 7938 73 3 0x100090 kqread syslogd 7938 237583 1 0 3 0x100082 netio syslogd 50143 65556 59920 115 3 0x100092 kqread slaacd 7553 158390 59920 115 3 0x100092 kqread slaacd 59920 27928 1 0 3 0x100080 kqread slaacd 50619 91852 0 0 2 0x14200 zerothread 95698 341284 0 0 3 0x14200 aiodoned aiodoned 78346 384185 0 0 3 0x14200 syncer update 35483 96485 0 0 3 0x14200 cleaner cleaner 37455 212619 0 0 3 0x14200 reaper reaper 97057 373157 0 0 3 0x14200 pgdaemon pagedaemon 91493 60759 0 0 3 0x14200 bored crynlk 35056 57745 0 0 3 0x14200 bored crypto 98887 438542 0 0 3 0x14200 usbtsk usbtask 7033 285367 0 0 3 0x14200 usbatsk usbatsk 67842 14075 0 0 3 0x14200 bored sensors 64913 152421 0 0 3 0x14200 bored softnet 58192 505341 0 0 3 0x14200 bored systqmp 14935 112859 0 0 3 0x14200 bored systq -41646or205859 0 0 3 0x40014200 bored softclock 63289 164039 0 0 3 0x40014200 idle0 33873 301870 0 0 3 0x14200 bored smr 51627 52627 0 0 3 0x14200 kmalloc kmthread 1 371028 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb> show panic ieee80211_encrypt: key unset for sw crypto: 0 This never happens if there are no clients attached. For example, I can switch between two unused wpakeys and run 'netstart athn0' over and back ten times. But as soon as I change it back to my real wpakey, a client will attach, and the next 'netstart athn0' will result in the above panic. Am I missing something obvious? Is this a known caveat of athn? How can I further debug this? Jan OpenBSD 6.6-current (GENERIC) #398: Sun Nov 24 09:25:34 MST 2019 dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC real mem = 267931648 (255MB) avail mem = 247406592 (235MB) mpath0 at root scsibus0 at mpath0: 256 targets mainbus0 at root bios0 at mainbus0: date 11/05/08, BIOS32 rev. 0 @ 0xfd088 pcibios0 at bios0: rev 2.1 @ 0xf0000/0x10000 pcibios0: pcibios_get_intr_routing - function not supported pcibios0: PCI IRQ Routing information unavailable. pcibios0: PCI bus #0 is the last bus bios0: ROM list: 0xe0000/0xa800 cpu0 at mainbus0: (uniprocessor) cpu0: Geode(TM) Integrated Processor by AMD PCS ("AuthenticAMD" 586-class) 499 MHz, 05-0a-02 cpu0: FPU,DE,PSE,TSC,MSR,CX8,SEP,PGE,CMOV,CFLUSH,MMX,MMXX,3DNOW2,3DNOW mtrr: K6-family MTRR support (2 registers) pci0 at mainbus0 bus 0: configuration mode 1 (no bios) pchb0 at pci0 dev 1 function 0 "AMD Geode LX" rev 0x33 glxsb0 at pci0 dev 1 function 2 "AMD Geode LX Crypto" rev 0x00: RNG AES vr0 at pci0 dev 9 function 0 "VIA VT6105M RhineIII" rev 0x96: irq 10, address 00:0d:b9:1a:a4:10 ukphy0 at vr0 phy 1: Generic IEEE 802.3u media interface, rev. 3: OUI 0x004063, model 0x0034 vr1 at pci0 dev 10 function 0 "VIA VT6105M RhineIII" rev 0x96: irq 11, address 00:0d:b9:1a:a4:11 ukphy1 at vr1 phy 1: Generic IEEE 802.3u media interface, rev. 3: OUI 0x004063, model 0x0034 vr2 at pci0 dev 11 function 0 "VIA VT6105M RhineIII" rev 0x96: irq 15, address 00:0d:b9:1a:a4:12 ukphy2 at vr2 phy 1: Generic IEEE 802.3u media interface, rev. 3: OUI 0x004063, model 0x0034 athn0 at pci0 dev 12 function 0 "Atheros AR9280" rev 0x01: irq 9 athn0: AR9280 rev 2 (2T2R), ROM rev 22, address 04:f0:21:01:d6:86 glxpcib0 at pci0 dev 15 function 0 "AMD CS5536 ISA" rev 0x03: rev 3, 32-bit 3579545Hz timer, watchdog, gpio, i2c gpio0 at glxpcib0: 32 pins iic0 at glxpcib0 maxtmp0 at iic0 addr 0x4c: lm86 pciide0 at pci0 dev 15 function 2 "AMD CS5536 IDE" rev 0x01: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: <SDCFHS-016G> wd0: 1-sector PIO, LBA48, 15279MB, 31293360 sectors wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 2 pciide0: channel 1 ignored (disabled) ohci0 at pci0 dev 15 function 4 "AMD CS5536 USB" rev 0x02: irq 12, version 1.0, legacy support ehci0 at pci0 dev 15 function 5 "AMD CS5536 USB" rev 0x02: irq 12 usb0 at ehci0: USB revision 2.0 uhub0 at usb0 configuration 1 interface 0 "AMD EHCI root hub" rev 2.00/1.00 addr 1 isa0 at glxpcib0 isadma0 at isa0 com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo com0: console com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo pcppi0 at isa0 port 0x61 spkr0 at pcppi0 npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16 usb1 at ohci0: USB revision 1.0 uhub1 at usb1 configuration 1 interface 0 "AMD OHCI root hub" rev 1.00/1.00 addr 1 nvram: invalid checksum vscsi0 at root scsibus1 at vscsi0: 256 targets softraid0 at root scsibus2 at softraid0: 256 targets root on wd0a (9cd0e5ba033bd225.a) swap on wd0b dump on wd0b clock: unknown CMOS layout