[Bug 233377] [PowerPC64] Panic during high disk I/O activity

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233377

            Bug ID: 233377
           Summary: [PowerPC64] Panic during high disk I/O activity
           Product: Base System
           Version: CURRENT
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: sbruno at FreeBSD.org

During substantial ZFS disk activity, the pkg builder in the cluster will fail.
 This is a Tyan PowerPC64 Machine.


rm: /usr/local/poudriere/data/.m/head-powerpc64-default/ref/lib: Directory not 

empty
panic: Memory modified after free 0xc000000065ceec40(32) val=0 @
0xc000000065ceec40

cpuid = 31
time = 1542804498
KDB: stack backtrace:
0xe000000090207020: at .kdb_backtrace+0x5c
0xe000000090207150: at .vpanic+0x1b4
0xe000000090207210: at .panic+0x38
0xe0000000902072a0: at .trash_ctor+0x58
0xe000000090207320: at .trash_fini+0x1c
0xe0000000902073a0: at .uma_zdestroy+0x164
0xe000000090207450: at .uma_zdestroy+0x42c
0xe0000000902074e0: at .sys_swapoff+0x2c4
0xe000000090207570: at .uma_zfree_pcpu_arg+0x2ec
0xe000000090207600: at .zone_drain+0x18
0xe000000090207680: at .uma_avail+0x4c4
0xe000000090207710: at .zone_drain+0x378
0xe0000000902077a0: at .uma_reclaim_worker+0x20c
0xe000000090207850: at .fork_exit+0xd0
0xe0000000902078f0: at .fork_trampoline+0x10
0xe000000090207920: at -0x4
KDB: enter: panic
[ thread pid 15 tid 100219 ]
Stopped at      .kdb_enter+0x60:        ld      r2, r1, 0x28
db> bt

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