VERIFY3(dev->l2ad_hand + distance < dev->l2ad_end) failed

[VoxSciurorum]

System information

Type	Version/Name
Distribution Name	FreeBSD
Distribution Version	13.3-STABLE
Kernel Version	13.3-STABLE
Architecture	amd64
OpenZFS Version	zfs-2.1.15-FreeBSD_gfb6d53206

Describe the problem you're observing

While receiving an rsync incremental update, and doing nothing else, my server crashed with

panic: VERIFY3(dev->l2ad_hand + distance < dev->l2ad_end) failed (161060749312 < 161060749312)

This is in l2arc_evict in arc.c. I suspect < may need to be <=.

Describe how to reproduce the problem

It happened only once.

Include any warning/errors/backtraces from the system logs

The dev pointer points at

 l2ad_hand = 161051246592,
 l2ad_start = 4198400,
 l2ad_end = 161060749312,
 l2ad_first = 0,
 l2ad_writing = 0,

Variable distance is 9502720, equal to l2ad_end - l2ad_hand, as expected from the panic message.

My server has a raidz2 pool on hard drives with a cache on SSD. RAM is 24 GB.

Reported to FreeBSD at https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279038.

[gamanakis]

Thanks for reporting this, you are probably right. I will take a look.