panic: thread 0xffff800020bba720 cannot exit while holding sleeplocks
Stopped at      db_enter+0x18:  addq    $0x8,%rsp
    TID    PID    UID     PRFLAGS     PFLAGS  CPU  COMMAND
 128343  76038      0         0x2      0x480    1  syz-executor1
*215594  31246      0     0x14000      0x200    0  reaper
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
witness_thread_exit(6731aca14bc2ea81) at witness_thread_exit+0x244 sys/kern/subr_witness.c:1377
reaper(0) at reaper+0x14f sys/kern/kern_exit.c:412
end trace frame: 0x0, count: 11
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reports.  Insufficient info makes it difficult to find and fix bugs.
ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> show panic
thread 0xffff800020bba720 cannot exit while holding sleeplocks
ddb{0}> trace
db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:399
panic() at panic+0x16c sys/kern/subr_prf.c:208
witness_thread_exit(6731aca14bc2ea81) at witness_thread_exit+0x244 sys/kern/subr_witness.c:1377
reaper(0) at reaper+0x14f sys/kern/kern_exit.c:412
end trace frame: 0x0, count: -4
ddb{0}> show registers
rdi                                0
rsi                              0x1
rbp               0xffff800020b66e30
rbx               0xffff800020b66ed0
rdx               0xffffffff81f3066d    apollo_pio_rec+0x86ea
rcx                            0x201
rax                              0x1
r8                0xffffffff817c1934    kprintf+0x174
r9                               0x1
r10               0x277c8f88204e0c38
r11               0xbd293342174a2262
r12                     0x3000000008
r13               0xffff800020b66e40
r14                            0x100
r15                              0x1
rip               0xffffffff81598c38    db_enter+0x18
cs                               0x8
rflags                         0x246
rsp               0xffff800020b66e20
ss                              0x10
db_enter+0x18:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (reaper) pid=215594 stat=onproc
    flags process=14000<NOZOMBIE,SYSTEM> proc=200<SYSTEM>
    pri=4, usrpri=51, nice=20
    forw=0xffffffffffffffff, list=0xffff800020b20e10,0xffff800020b21c30
    process=0xffff800020b5a698 user=0xffff800020b62000, vmspace=0xffffffff822f1200
    estcpu=1, cpticks=3, pctcpu=0.0
    user=0, sys=3, intr=0
ddb{0}>