[Bug 274700] panic near arc_reap on 12th day

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274700

--- Comment #2 from bsdbugs_mr@pradmin.ru ---
bt -full:
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
        td = <optimized out>
#1  doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:396
        error = 0
        coredump = <optimized out>
#2  0xffffffff80c0648a in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:484
        once = 0
#3  0xffffffff80c0692e in vpanic (fmt=<optimized out>,
ap=ap@entry=0xfffffe014e182bb0) at /usr/src/sys/kern/kern_shutdown.c:923
        buf = "page fault", '\000' <repeats 245 times>
        other_cpus = {__bits = {4087, 0, 0, 0}}
        td = 0xfffffe0152858740
        bootopt = <unavailable>
        newpanic = <optimized out>
#4  0xffffffff80c06763 in panic (fmt=<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:847
        ap = {{gp_offset = 16, fp_offset = 48, overflow_arg_area =
0xfffffe014e182be0, reg_save_area = 0xfffffe014e182b80}}
#5  0xffffffff810b1fa7 in trap_fatal (frame=0xfffffe014e182ca0, eva=0) at
/usr/src/sys/amd64/amd64/trap.c:942
        softseg = {ssd_base = 0, ssd_limit = 1048575, ssd_type = 27, ssd_dpl =
0, ssd_p = 1, ssd_long = 1, ssd_def32 = 0, ssd_gran = 1}
        code = <optimized out>
        gdt = <optimized out>
        ss = 40
        type = <optimized out>
        handled = <optimized out>
#6  0xffffffff810b1fff in trap_pfault (frame=0xfffffe014e182ca0,
usermode=false, signo=<optimized out>, ucode=<optimized out>)
    at /usr/src/sys/amd64/amd64/trap.c:761
        td = 0xfffffe0152858740
        p = <optimized out>
        eva = 0
        map = <optimized out>
        ftype = <optimized out>
        rv = <optimized out>
#7  <signal handler called>
No locals.
#8  0xffffffff80f76524 in vm_freelist_add (m=m@entry=0xfffffe00133e5358,
order=<optimized out>, tail=1, fl=<optimized out>) at
/usr/src/sys/vm/vm_phys.c:380
No locals.
#9  vm_phys_free_pages (m=m@entry=0xfffffe00133e5358, order=<optimized out>,
order@entry=0) at /usr/src/sys/vm/vm_phys.c:1133
        seg = <optimized out>
        pa = <optimized out>
        m_buddy = <optimized out>
        fl = <optimized out>
#10 0xffffffff80f69455 in vm_page_free_toq (m=0xfffffe00133e5358) at
/usr/src/sys/vm/vm_page.c:3911
        vmd = <optimized out>
        zone = <optimized out>
#11 0xffffffff80f4f39c in keg_free_slab (keg=keg@entry=0xfffff8001f178d80,
slab=<optimized out>, start=<optimized out>) at /usr/src/sys/vm/uma_core.c:1575
        mem = 0xfffff802f5e67000 <error: Cannot access memory at address
0xfffff802f5e67000>
        size = 4096
        i = <optimized out>
        flags = 8 '\b'
#12 0xffffffff80f4f231 in keg_drain_domain (keg=keg@entry=0xfffff8001f178d80,
domain=domain@entry=0) at /usr/src/sys/vm/uma_core.c:1633
        freeslabs = {lh_first = 0xfffff8062e3300b8}
        partial = <optimized out>
        stokeep = <optimized out>
        stofree = <optimized out>
        i = <optimized out>
        slab = 0x0
        tmp = 0xfffff802d49a76f8
        dom = <optimized out>
#13 0xffffffff80f4c20a in keg_drain (keg=0xfffff8001f178d80, domain=-1) at
/usr/src/sys/vm/uma_core.c:1653
        i = 0
#14 zone_reclaim (zone=0xfffffe0152d8c800, zone@entry=0xfffff8001f0fee00,
domain=domain@entry=-1, waitok=waitok@entry=1, drain=<optimized out>)
    at /usr/src/sys/vm/uma_core.c:1678
No locals.
#15 0xffffffff80f4c05c in uma_zone_reclaim_domain (zone=0xfffffe00133e5358,
req=<optimized out>, req@entry=1, domain=-1) at /usr/src/sys/vm/uma_core.c:5245
No locals.
#16 0xffffffff82164df3 in kmem_cache_reap_soon (cache=<optimized out>) at
/usr/src/sys/contrib/openzfs/module/os/freebsd/spl/spl_kmem.c:247
No locals.
#17 0xffffffff8216c3b1 in abd_cache_reap_now () at
/usr/src/sys/contrib/openzfs/module/os/freebsd/zfs/abd_os.c:504
No locals.
#18 0xffffffff821a69aa in arc_kmem_reap_soon () at
/usr/src/sys/contrib/openzfs/module/zfs/arc.c:4877
        prev_cache = <optimized out>
        prev_data_cache = <optimized out>
        i = <optimized out>
#19 0xffffffff821aee59 in arc_reap_cb (arg=0xfffffe00133e5358, zthr=0x0) at
/usr/src/sys/contrib/openzfs/module/zfs/arc.c:5024
        cookie = 0
        free_memory = <optimized out>
        can_free = <optimized out>
#20 0xffffffff8231c17a in zthr_procedure (arg=arg@entry=0xfffff8001f0fee00) at
/usr/src/sys/contrib/openzfs/module/zfs/zthr.c:245
        t = 0xfffff8001f0fee00
#21 0xffffffff80bc314e in fork_exit (callout=0xffffffff8231c0c0
<zthr_procedure>, arg=0xfffff8001f0fee00, frame=0xfffffe014e182f40)
    at /usr/src/sys/kern/kern_fork.c:1093
        td = 0xfffffe0152858740
        p = 0xfffff800206af550
        dtd = <optimized out>
#22 <signal handler called>
No locals.

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