assert_sleepable panic

[Patrick Welche <prlw1%cam.ac.uk@localhost>]

On a today's 9.99.48/amd64 laptop, I just had a:

(gdb) x/s panicstr
0xffffffff813930a0 <scratchstr.13582>:      "assert_sleepable: softint caller=0xffffffff806da4a2"
(gdb) bt
#0  0xffffffff80222c45 in cpu_reboot (howto=howto@entry=260, 
    bootstr=bootstr@entry=0x0) at ../../../../arch/amd64/amd64/machdep.c:720
#1  0xffffffff8068e9ff in kern_reboot (howto=howto@entry=260, 
    bootstr=bootstr@entry=0x0) at ../../../../kern/kern_reboot.c:73
#2  0xffffffff806d2517 in vpanic (
    fmt=fmt@entry=0xffffffff80ba5ed0 "%s: %s caller=%p", 
    ap=ap@entry=0xffff95013c5d6ab8) at ../../../../kern/subr_prf.c:336
#3  0xffffffff806d25db in panic (
    fmt=fmt@entry=0xffffffff80ba5ed0 "%s: %s caller=%p")
    at ../../../../kern/subr_prf.c:255
#4  0xffffffff8067add0 in assert_sleepable ()
    at ../../../../kern/kern_lock.c:107
#5  0xffffffff806da4a2 in vmem_alloc (
    vm=vm@entry=0xffffffff81319000 <kmem_va_arena_store>, 
    size=size@entry=69632, flags=4097, addrp=addrp@entry=0xffff95013c5d6be0)
    at ../../../../kern/subr_vmem.c:1046
#6  0xffffffff80636a6a in uvm_km_kmem_alloc (
    vm=0xffffffff81319000 <kmem_va_arena_store>, size=size@entry=69632, 
    flags=flags@entry=4097, addr=addr@entry=0xffff95013c5d6c38)
    at ../../../../uvm/uvm_km.c:818
#7  0xffffffff806c4d4d in kmem_intr_alloc (
    requested_size=requested_size@entry=69632, kmflags=<optimized out>)
    at ../../../../kern/subr_kmem.c:213
#8  0xffffffff8067ee6f in kern_malloc (reqsize=<optimized out>, flags=0)
    at ../../../../kern/kern_malloc.c:129
#9  0xffffffff807519ff in cgd_diskstart (dev=<optimized out>, 
    bp=0xffff8fdacde2a8e0) at ../../../../dev/cgd.c:696
#10 0xffffffff80754daf in dk_start (dksc=0xffff8fdabec0fc80, 
    bp=0xffff8fdacde2a8e0) at ../../../../dev/dksubr.c:429
#11 0xffffffff8074d5cc in spec_strategy (v=<optimized out>)
    at ../../../../miscfs/specfs/spec_vnops.c:1075
#12 0xffffffff80741a7a in VOP_STRATEGY (vp=vp@entry=0xffff8fdac0763280, 
    bp=bp@entry=0xffff8fdacde2a8e0) at ../../../../kern/vnode_if.c:1386
#13 0xffffffff80756831 in dkstart (sc=0xffff8fdabec0f608)
    at ../../../../dev/dkwedge/dk.c:1348
#14 0xffffffff80754840 in dk_done1 (dksc=dksc@entry=0xffff8fdabec0fc80, 
    bp=bp@entry=0xffff8fdace278e88, lock=lock@entry=true)
    at ../../../../dev/dksubr.c:476
#15 0xffffffff80754ea7 in dk_done (dksc=dksc@entry=0xffff8fdabec0fc80, 
    bp=bp@entry=0xffff8fdace278e88) at ../../../../dev/dksubr.c:482
#16 0xffffffff80752d36 in cgd_iodone2 (sc=0xffff8fdabec0fc80, 
    cx=<optimized out>) at ../../../../dev/cgd.c:816
#17 0xffffffff80756a6e in dkiodone (bp=<optimized out>)
    at ../../../../dev/dkwedge/dk.c:1382
#18 0xffffffff80754840 in dk_done1 (dksc=dksc@entry=0xffff8fdab9fb2a00, 
    bp=0xffff8fdabea478a8, lock=lock@entry=true)
    at ../../../../dev/dksubr.c:476
#19 0xffffffff80754ea7 in dk_done (dksc=dksc@entry=0xffff8fdab9fb2a00, 
    bp=<optimized out>) at ../../../../dev/dksubr.c:482
#20 0xffffffff803d6c40 in lddone (sc=0xffff8fdab9fb2a00, bp=<optimized out>)
    at ../../../../dev/ld.c:466
#21 0xffffffff804238e8 in nvme_q_complete (sc=0xffff95001fad7000, 
    q=0xffff8fdab9d2d300) at ../../../../dev/ic/nvme.c:1380
#22 0xffffffff8069fbeb in softint_execute (s=3, l=0xffff8fdab8e32480, 
    si=0xffff95013c5c5008) at ../../../../kern/kern_softint.c:579
#23 softint_dispatch (pinned=<optimized out>, s=3)
    at ../../../../kern/kern_softint.c:886
#24 0xffffffff8021d8ef in Xsoftintr ()


P