syzbot

panic: failed to reclaim memory
cpuid = 0
time = 35
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe0056ea5470
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe0056ea55d0
vpanic() at vpanic+0x257/frame 0xfffffe0056ea5790
panic() at panic+0xb5/frame 0xfffffe0056ea5860
vm_pageout_oom() at vm_pageout_oom+0xce4/frame 0xfffffe0056ea58f0
vm_pageout_worker() at vm_pageout_worker+0xf9b/frame 0xfffffe0056ea5ea0
vm_pageout() at vm_pageout+0x2ce/frame 0xfffffe0056ea5ef0
fork_exit() at fork_exit+0xcc/frame 0xfffffe0056ea5f30
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe0056ea5f30
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 8 tid 100077 ]
Stopped at      kdb_enter+0x6e: movq    $0,0x2587a77(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b
es                        0x3b
fs                        0x13
gs                        0x1b
ss                        0x28
rax                       0x12
rcx         0xfffffe0002bf1850
rdx                          0
rbx         0xffffffff8283c160  .str.27
rsp         0xfffffe0056ea55b0
rbp         0xfffffe0056ea55d0
rsi                          0
rdi         0xffffffff81664139  printf+0x149
r8                           0
r9                  0xffffffff
r10                          0
r11                       0x3e
r12         0xfffffe0058a14780
r13         0xfffffffffffffffe
r14         0xffffffff8283c160  .str.27
r15                          0
rip         0xffffffff8164d41e  kdb_enter+0x6e
rflags                    0x46
kdb_enter+0x6e: movq    $0,0x2587a77(%rip)
db> show proc
Process 8 (pagedaemon) at 0xfffffe0058a0a558:
 state: NORMAL
 uid: 0 gid: 0 supp gids: 0
 parent: pid 0 at 0xffffffff83b5ef60
 ABI: null
 flag: 0x10000284  flag2: 0
 reaper: 0xffffffff83b5ef60 reapsubtree: 8
 sigparent: 20
 vmspace: 0xffffffff83b5ff40
   (map 0xffffffff83b5ff40)
   (map.pmap 0xffffffff83b5ffe0)
   (pmap 0xffffffff83b60050)
 threads: 3
100077                   Run     CPU 0                       [dom0]
100080                   D       laundp  0xffffffff82840840  [laundry: dom0]
100081                   D       umarcls 0xffffffff82840841  [serialport: VM disconnected.