[Bug 272243] panic: vm_fault failed: 0xffff0000007c5ccc error 1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272243

            Bug ID: 272243
           Summary: panic: vm_fault failed: 0xffff0000007c5ccc error 1
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: pkubaj@FreeBSD.org

I'm on CURRENT rev. f0c97033018b. I'm trying to run py-speedtest-cli on
Traverse Ten64 router. Each time I do it, I receive a KP:
Fatal data abort:
  x0: 0x0000000000000001
  x1: 0xffffa00007092c00
  x2: 0x0000000000000008
  x3: 0x0000000087811000
  x4: 0x0000000000000000
  x5: 0xffffa081514a0a80
  x6: 0x0000000000000200
  x7: 0xffffa0003133e700
  x8: 0xdeadc0dedeadc0de
  x9: 0xffff000000c64678 (pic_post_ithread_desc + 0x0)
 x10: 0x00000000d4aa2c0d
 x11: 0x0000000000000093
 x12: 0x0000000000000001
 x13: 0x0000000000000000
 x14: 0x0000000000010000
 x15: 0x0000000000000001
 x16: 0x0000000000010000
 x17: 0x000000000000000a
 x18: 0xffff00010f45b690
 x19: 0xffffa000386e2600
 x20: 0xdeadc0dedeadc07e
 x21: 0xffffa00002320d00
 x22: 0x0000000000000001
 x23: 0xffff00010f45b7c0
 x24: 0xffffa0000250e600
 x25: 0xffffa000031b2b00
 x26: 0xffff000000cc3b18 (Giant + 0x18)
 x27: 0xffff00000096f9f4 (digits + 0x22d31)
 x28: 0xffffa000031b2b10
 x29: 0xffff00010f45b690
  sp: 0xffff00010f45b690
  lr: 0xffff0000004383cc (m_free + 0x138)
 elr: 0xffff0000007c5ccc (intr_isrc_post_ithread + 0x14)
spsr: 0x0000000060000045
 far: 0x0000000000000001
 esr: 0x0000000096000004
panic: vm_fault failed: 0xffff0000007c5ccc error 1
cpuid = 3
time = 200
KDB: stack backtrace:
db_trace_self() at db_trace_self
db_trace_self_wrapper() at db_trace_self_wrapper+0x30
vpanic() at vpanic+0x13c
panic() at panic+0x44
data_abort() at data_abort+0x358
handle_el1h_sync() at handle_el1h_sync+0x14
--- exception, esr 0x96000004
intr_isrc_post_ithread() at intr_isrc_post_ithread+0x14
m_free() at m_free+0x134
m_free() at m_free+0x134
m_freem() at m_freem+0x24
dpaa2_ni_tx_conf() at dpaa2_ni_tx_conf+0xb8
dpaa2_ni_poll() at dpaa2_ni_poll+0xe4
dpaa2_io_intr() at dpaa2_io_intr+0x13c
ithread_loop() at ithread_loop+0x2a0
fork_exit() at fork_exit+0x74
fork_trampoline() at fork_trampoline+0x14

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