Ewen Chan wrote:
::status
debugging crash dump vmcore.0 (64-bit) from unknown
operating system: 5.10 Generic_118855-14 (i85pc)
panic message:
assertion failed: 0 == dmu_buf_hold_array(os, object, offset, size, FALSE, FTAG, 
&numbufs, &dbp), file : ../../common/fs/zfs/dmu.c, line: 366
dump content: kernel pages only
::stack
vpanic()
0xfffffffffb9ad0f3()
dmu_write+0x127()
space_map_sync+0x1ee()
metaslab_sync+0xfa()
vdev_sync+0x50()
spa_sync+0x10e()
txg_sync_thread+0x115()

It would appear that some critical metadata was damaged. Since you appear to be using a single (16-wide!) raid-z group, this could happen if there are failures on two devices (despite the fact that we store multiple copies of all critical metadata).

In this situation it may not be possible to recover your data.

--matt
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