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

[bugzilla-noreply at freebsd.org]

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

--- Comment #3 from Sean Bruno <sbruno at FreeBSD.org> ---
I'm not sure this is helpful, but with the debug printf in the kernel the panic
looks like this on the console.  Is there any debugging I can do from the db>
prompt to give us a clue here?

draining zone 2048
draining zone 1024
draining zone 512
draining zone 256
draining zone 128
draining zone 64
draining zone 32
draining zone 16
draining zone mt_zone
draining zone mt_stats_zone
draining zone 64 pcpu
draining zone fakepg
draining zone UPVO entry
draining zone VMSPACE
draining zone MAP ENTRY
draining zone KMAP ENTRY
draining zone MAP
draining zone RADIX NODE
draining zone VM OBJECT
draining zone vmem btag
draining zone vmem
draining zone 256 Bucket
draining zone 128 Bucket
draining zone 64 Bucket
draining zone 32 Bucket
draining zone 16 Bucket
draining zone 12 Bucket
panic: Memory modified after free 0xc00000037d3c0c00(96) val=0 @
0xc00000037d3c0c00

cpuid = 31
time = 1542904594
KDB: stack backtrace:
0xe000000090207010: at .kdb_backtrace+0x5c
0xe000000090207140: at .vpanic+0x1b4
0xe000000090207200: at .panic+0x38
0xe000000090207290: at .trash_ctor+0x58
0xe000000090207310: at .trash_fini+0x1c
0xe000000090207390: at .uma_zdestroy+0x164
0xe000000090207440: at .uma_zdestroy+0x42c
0xe0000000902074d0: at .sys_swapoff+0x2c4
0xe000000090207560: at .uma_zfree_pcpu_arg+0x2ec
0xe0000000902075f0: at .zone_drain+0x34
0xe000000090207680: at .uma_avail+0x4c4
0xe000000090207710: at .zone_drain+0x398
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

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