Random reboots with wifi/wpa/iwm (12-alpha6)

Hi

For a while I have had occasional random reboots. Today I managed to get 2
core dumps, both with the same backtrace.

It might be the case that this only happens after the system has been
resumed from S3 but I'm not sure. The second time the reboot was 30 minutes
after resume. I'm using wpa_supplicant from pkg.

Is this a known issue or should I file a report in bugzilla?

Unread portion of the kernel message buffer:
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80682bed
stack pointer           = 0x28:0xfffffe009b4183d0
frame pointer           = 0x28:0xfffffe009b418440
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 3266 (wpa_supplicant)
trap number             = 12
Dumping 1195 out of 16251
MB:..2%..11%..21%..31%..41%..51%..61%..71%..81%..92%

__curthread () at ./machine/pcpu.h:230
230             __asm("movq %%gs:%1,%0" : "=r" (td)
(kgdb) #0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:366
#2  0xffffffff823adfe8 in vt_kms_postswitch ()
   from /boot/modules.drm-v4.16/drm.ko
#3  0xffffffff80521aac in vt_window_switch (
    vw=0xffffffff80e8b960 <vt_conswindow>)
    at /usr/src/sys/dev/vt/vt_core.c:580
#4  0xffffffff8051ecc0 in vtterm_cngrab (tm=<optimized out>)
    at /usr/src/sys/dev/vt/vt_core.c:1572
#5  0xffffffff80640552 in cngrab () at /usr/src/sys/kern/kern_cons.c:370
#6  0xffffffff806a363b in vpanic (fmt=0xffffffff80afcafc "%s",
    ap=0xfffffe009b418120) at /usr/src/sys/kern/kern_shutdown.c:846
#7  0xffffffff806a3533 in panic (fmt=<unavailable>)
    at /usr/src/sys/kern/kern_shutdown.c:799
#8  0xffffffff80a3da6f in trap_fatal (frame=0xfffffe009b418310, eva=1040)
    at /usr/src/sys/amd64/amd64/trap.c:935
#9  0xffffffff80a3dac9 in trap_pfault (frame=0xfffffe009b418310, usermode=0)
    at /usr/src/sys/amd64/amd64/trap.c:771
#10 0xffffffff80a3d0ee in trap (frame=0xfffffe009b418310)
    at /usr/src/sys/amd64/amd64/trap.c:441
#11 <signal handler called>
#12 __mtx_lock_sleep (c=0xfffffe00a21f71b0, v=<optimized out>)
    at /usr/src/sys/kern/kern_mutex.c:565
#13 0xffffffff8080d362 in psq_drain (psq=<optimized out>)
    at /usr/src/sys/net80211/ieee80211_power.c:187
#14 ieee80211_node_psq_drain (ni=0xfffffe00a21f4000)
    at /usr/src/sys/net80211/ieee80211_power.c:214
#15 0xffffffff80801a37 in node_cleanup (ni=0xfffffe00a21f4000)
    at /usr/src/sys/net80211/ieee80211_node.c:1238
#16 0xffffffff80801955 in node_free (ni=0xfffffe00a21f4000)
    at /usr/src/sys/net80211/ieee80211_node.c:1275
#17 0xffffffff80802e40 in ieee80211_sta_join1 (selbs=<optimized out>)
    at /usr/src/sys/net80211/ieee80211_node.c:865
#18 0xffffffff80803d74 in ieee80211_sta_join (vap=<optimized out>,
    chan=<optimized out>, se=<optimized out>)
    at /usr/src/sys/net80211/ieee80211_node.c:1037
#19 0xffffffff807f8de1 in setmlme_assoc_sta (vap=<optimized out>,
    mac=0xfffffe009b4185e4 "`\320,\017\035\330Courtyard_GUEST",
    ssid_len=<optimized out>, ssid=<optimized out>)
    at /usr/src/sys/net80211/ieee80211_ioctl.c:1579
#20 ieee80211_ioctl_setmlme (vap=<optimized out>, ireq=<optimized out>)
    at /usr/src/sys/net80211/ieee80211_ioctl.c:1636
#21 ieee80211_ioctl_set80211 (vap=<optimized out>, cmd=0,
    ireq=<optimized out>) at /usr/src/sys/net80211/ieee80211_ioctl.c:2907
#22 0xffffffff807a8b61 in ifioctl (so=0xfffff802342dca38, cmd=2149607914,
    data=<optimized out>, td=0xfffff8011b9b7000) at
/usr/src/sys/net/if.c:3101
#23 0xffffffff8070e55d in fo_ioctl (fp=<optimized out>, com=<optimized
out>,
    active_cred=0xfffff8011b9b7000, td=<optimized out>, data=<optimized
out>)
    at /usr/src/sys/sys/file.h:330
#24 kern_ioctl (td=0xfffff8011b9b7000, fd=4, com=2149607914,
    data=0xfffffe0000887000 "") at /usr/src/sys/kern/sys_generic.c:800
#25 0xffffffff8070e27e in sys_ioctl (td=0xfffff8011b9b7000,
    uap=0xfffff8011b9b73c0) at /usr/src/sys/kern/sys_generic.c:712
#26 0xffffffff80a3e489 in syscallenter (td=<optimized out>)
    at /usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:135
#27 amd64_syscall (td=0xfffff8011b9b7000, traced=0)
    at /usr/src/sys/amd64/amd64/trap.c:1050
#28 <signal handler called>
#29 0x0000000800828bba in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffffffe6f8