[df5582] teardown: device_delete_child(df5582rig0, ig4iic0) -> smbus_acpi_detach() runs now
[df5582] fake ig4iic detach (smbacpi child detaches first: smbus_acpi_detach under test)
smbacpi0: detached
ig4iic0: detached
[df5582] teardown complete: smbacpi softc freed, GSBUS handler object freed (parked=1)
[df5582] trans released
panic: assertion "(((intptr_t)chunk ^ (intptr_t)z) & ZoneMask) == 0" failed in chunk_mark_free at /usr/src/sys/kern/kern_slaballoc.c:1675
cpuid = 1
Trace beginning at frame 0xfffff80089750950
chunk_mark_free() at chunk_mark_free+0x99 0xffffffff80655da9 
chunk_mark_free() at chunk_mark_free+0x99 0xffffffff80655da9 
slab_cleanup() at slab_cleanup+0xbb 0xffffffff8065662b 
slotimer_callback() at slotimer_callback+0x11 0xffffffff80687d81 
softclock_handler() at softclock_handler+0x1b8 0xffffffff80688438 
Debugger("panic")

CPU1 stopping CPUs: 0x0000003d
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db> 
panic: assertion "(((intptr_t)chunk ^ (intptr_t)z) & ZoneMask) == 0" failed in chunk_mark_free at /usr/src/sys/kern/kern_slaballoc.c:1675
cpuid = 1
Trace beginning at frame 0xfffff80089750950
chunk_mark_free() at chunk_mark_free+0x99 0xffffffff80655da9
chunk_mark_free() at chunk_mark_free+0x99 0xffffffff80655da9
slab_cleanup() at slab_cleanup+0xbb 0xffffffff8065662b
slotimer_callback() at slotimer_callback+0x11 0xffffffff80687d81
softclock_handler() at softclock_handler+0x1b8 0xffffffff80688438
Debugger("panic")