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...t beeing held: rw_enter(&pbuf->b_hdr->b_datalock, RW_READER); err = arc_read_nolock(pio, spa, bp, done, private, priority, flags, arc_flags, zb); rw_exit(&pbuf->b_hdr->b_datalock); <--- THIS ONE The only possiblity was that b_hdr for pbuf was changed somewhere. We diagnozed this further and the b_hdr field is changed in arc_release() function, here: buf->b_hdr = nhdr; Backtrace for this change is the following: arc_release() at arc_release+0x4ec dbuf_write() at dbuf_write+0x26b dbuf_sync_list() at dbuf_sync_list+0x3eb dbuf_sync_list() at dbuf_sync_list+0x17f d...

...ormation at times (numbers out of range, BYPASS/OFF states appearing and disappearing, etc.), or if you could forward the question to some colleagues that can? https://github.com/networkupstools/nut/issues/1895 https://github.com/networkupstools/nut/issues/750 At the moment I can't well diagnoze what happens there - if the device is defective, or if the protocol changed (since the driver was coded) so it no longer fits the device and some assumptions are getting failed?.. Thanks in advance, Jim Klimov -------------- next part -------------- An HTML attachment was scrubbed... URL: <http...