[6.11] Windows 11 guest dies when VM is hosted on bcachefs filesystem

[NikolayKuzmin]

Stuck on 6.10 kernel due to unable to work with virtual machine on both 6.11 and 6.12. Here is 6.11 issue:

After VM startup and right after guest (win11) login (not sure how it is connected), vm crashes with following message in kernel log.
kerneltrace-611.log

Can't understand why this is nocow_locking, I tried once qemu raw image with nocow options, but after it proved to be unusable I've copied an image with dd (to ensure there will no extent share between files) and new image has no nocow option
My bcachefs setup contains 2 nvme ssds (ssd.ssd# naming), 2 cmr hdds (hdd.cmr.cmr#) and 1 smr hdd (hdd.smr.smr#). The only anomaly is SMR drive formatted with 16mb bucket size. But due to targets vm image data shouldn't go to smr.
bcachefs-super.txt