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List:       freebsd-hackers
Subject:    ZFS failure leads to panic/boot loop
From:       Michael Wayne <freebsd07 () wayne47 ! com>
Date:       2016-12-28 17:45:09
Message-ID: 20161228174509.GR32352 () manor ! msen ! com
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11.0 server installed from initial setup with ZFS mirrored drives. 

Ran fine for a few weeks sitting in the rack, then became unresponsive.

Plugging in a console showed it was in a panic / boot loop due to ZFS.

Would like suggestions on what is wrong that caused this problem
as well as how to proceed to recover from it.

Typing this from a phone photo of the console screen so showing
only what I believe to be relevant; I can supply actual addresses
if required.  Boot gets to:

[...]
uhub2: 4 ports...
panic: Solaris(panic) blkptr at 0xfffffe0003244b80 has invalid CHECKSUM 0
cpuid - 0
KDB: stack backtrace
[...]
   zfs_panic_recover
   zfs_blkptr_verify
   zio_read
   spa_load_verify


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