vnet_alloc: panic: Memory modified after free 0xfffffe002efc8ed0(8) val=deadc0df

I wonder if people are aware of this issue and if anyone is looking into it.
I got notified about it by Jenkins after an unrelated commit (ichwd).

panic: Memory modified after free 0xfffffe002efc8ed0(8) val=deadc0df _at_
0xfffffe002efc8ed0


11:51:33 cpuid = 0
11:51:33 time = 1544788293
11:51:33 KDB: stack backtrace:
11:51:33 db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
0xfffffe002634d4e0
11:51:33 vpanic() at vpanic+0x1b4/frame 0xfffffe002634d540
11:51:33 panic() at panic+0x43/frame 0xfffffe002634d5a0
11:51:33 trash_ctor() at trash_ctor+0x4c/frame 0xfffffe002634d5b0
11:51:33 uma_zalloc_arg() at uma_zalloc_arg+0x886/frame 0xfffffe002634d630
11:51:33 uma_zalloc_pcpu_arg() at uma_zalloc_pcpu_arg+0x23/frame 0xfffffe002634d660
11:51:33 vnet_icmpstat_init() at vnet_icmpstat_init+0x1a/frame 0xfffffe002634d680
11:51:33 vnet_alloc() at vnet_alloc+0x144/frame 0xfffffe002634d6b0
11:51:33 kern_jail_set() at kern_jail_set+0x1b32/frame 0xfffffe002634d940
11:51:33 sys_jail_set() at sys_jail_set+0x40/frame 0xfffffe002634d970
11:51:33 amd64_syscall() at amd64_syscall+0x272/frame 0xfffffe002634dab0
11:51:33 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe002634dab0
11:51:33 --- syscall (507, FreeBSD ELF64, sys_jail_set), rip = 0x80031da7a, rsp
= 0x7fffffffe618, rbp = 0x7fffffffe700 ---
11:51:33 KDB: enter: panic
11:51:33 [ thread pid 65285 tid 100146 ]
11:51:33 Stopped at      kdb_enter+0x3b: movq    $0,kdb_why
11:51:33 db:0:kdb.enter.panic> show pcpu
11:51:33 cpuid        = 0
11:51:33 dynamic pcpu = 0xb7fb00
11:51:33 curthread    = 0xfffff800059e5000: pid 65285 tid 100146 "jail"
11:51:33 curpcb       = 0xfffffe002634db80
11:51:33 fpcurthread  = 0xfffff800059e5000: pid 65285 "jail"
11:51:33 idlethread   = 0xfffff8000327a000: tid 100003 "idle: cpu0"
11:51:33 curpmap      = 0xfffff80005b04130
11:51:33 tssp         = 0xffffffff821cafa0
11:51:33 commontssp   = 0xffffffff821cafa0
11:51:33 rsp0         = 0xfffffe002634db80
11:51:33 gs32p        = 0xffffffff821d1bd8
11:51:33 ldt          = 0xffffffff821d1c18
11:51:33 tss          = 0xffffffff821d1c08
11:51:33 curvnet      = 0xfffff80003242b80

-- 
Andriy Gapon