I traced the call failure. I found the failing code is in
sa.c:1291#sa_build_index()
if (BSWAP_32(sa_hdr_phys->sa_magic) != SA_MAGIC) {
This code prints debug info to /proc/spl/kstat/zfs/dbgmsg, which for me is:
1629791353 sa.c:1293:sa_build_index(): Buffer Header: cb872954 !=
SA_MAGIC:2f505a object=0x45175e
So in this case seems the data is somehow corrupted, since this is
supposed to be a magic value that is always correct and doesn't change.
Not entirely clear how this actually played into the original bug. So it
may be that this is really a different bug. Hrm.
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https://bugs.launchpad.net/bugs/1906476
Title:
PANIC at zfs_znode.c:335:zfs_znode_sa_init() // VERIFY(0 ==
sa_handle_get_from_db(zfsvfs->z_os, db, zp, SA_HDL_SHARED,
&zp->z_sa_hdl)) failed
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