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CONTAP-776205: Copy-offload operations on CIFS can cause an unexpected system restart

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Issue

On certain ONTAP systems, a race condition during CIFS copy-offload operations can cause an unexpected system restart when an operation is aborted while a read is still in progress.
PANIC : page fault (supervisor read data, page not present) on VA 0xffffec0294ee9ed0 cs:rip 0x20:0xffffffff8128d5a0 rflags 0x10283

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