Locked up processes after upgrade to ZFS v15

[Martin Matuska]

One of my managed servers has also run into this problem with git and
smbd, backtraces are attached.
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git (state: zfsmrb)
Tracing pid 12378 tid 100168 td 0xffffff000842c7c0
sched_switch() at sched_switch+0x152
mi_switch() at mi_switch+0x219
sleepq_switch() at sleepq_switch+0xfa
sleepq_wait() at sleepq_wait+0x46
_sleep() at _sleep+0x256
zfs_freebsd_read() at zfs_freebsd_read+0x26c
VOP_READ_APV() at VOP_READ_APV+0xb6
vnode_pager_generic_getpages() at vnode_pager_generic_getpages+0x3c7
VOP_GETPAGES_APV() at VOP_GETPAGES_APV+0xb5
vnode_pager_getpages() at vnode_pager_getpages+0x81
vm_fault() at vm_fault+0xb42
trap_pfault() at trap_pfault+0x103
trap() at trap+0x519
calltrap() at calltrap+0x8
--- trap 0xc, rip = 0x800b3c7f9, rsp = 0x7fffffffd2b0, rbp = 0x7fffffffd3f0 ---

smbd (state: zfs) (pids: 15605, 15553, 15500, 15448, ...)
Tracing id 15605 tid 100398 td 0xffffff014f9cc7c0
sched_switch() at sched_switch+0x152
mi_switch() at mi_switch+0x219
sleepq_switch() at sleepq_switch+0xfa
sleepq_wait() at sleepq_wait+0x46
__lockmgr_args() at __lockmgr_args+0x74f
vop_stdlock() at vop_stdlock+0x39
VOP_LOCK1_APV() at VOP_LOCK1_APV+0x9b
_vn_lock() at _vn_lock+0x5d
extattr_get_vp() at exattr_get_vp+0x59
extattr_get_file() at extattr_get_file+0x126
syscall() at syscall+0x102
Xfast_syscall() at Xfast_syscall+0xe2
--- syscall (357, FreeBSD ELF64, extattr_get_file), rip = 0x80222fd2c, rsp = 0x7fffffffd8a8, rbp = 0x1501b84 ---