New panic in main-n253273-a52d8d4a6c6:

Hi!

The box was quite busy at the time.  The only odd thing I am aware of and which I do
not think is related is I have not been able to expand one of my zpool's.  ZFS sees my
added draid2:2d:10c:0s vdev but I can't seem to force zpool's expansion - my bet this
is somehow related to the mirrored special device in the pool even though autoexpand
is set to 'on' for the pool.

Not asking anyone to solve this, I plan on putting together a "how to reproduce" and
post to freebsd-fs@ but wanted to note this oddity.

--mikej

This is a unmodified GENERIC kernel.


Unread portion of the kernel message buffer:
panic: refcount 0xfffff801cc119284 wraparound
cpuid = 7
time = 1645382575
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0119a83c80
vpanic() at vpanic+0x17f/frame 0xfffffe0119a83cd0
panic() at panic+0x43/frame 0xfffffe0119a83d30
fdclose() at fdclose/frame 0xfffffe0119a83dc0
closefp_impl() at closefp_impl+0x77/frame 0xfffffe0119a83e00
amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe0119a83f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0119a83f30
--- syscall (6, FreeBSD ELF64, sys_close), rip = 0x3309a531b62a, rsp = 0x3309a2802bc8, rbp = 0x3309a2803000 ---
KDB: enter: panic

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55               __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct pcpu,
(kgdb) #0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=textdump@entry=0)
    at /usr/src/sys/kern/kern_shutdown.c:399
#2  0xffffffff804c86ba in db_dump (dummy=<optimized out>,
    dummy2=<unavailable>, dummy3=<unavailable>, dummy4=<unavailable>)
    at /usr/src/sys/ddb/db_command.c:575
#3  0xffffffff804c8572 in db_command (last_cmdp=<optimized out>,
    cmd_table=<optimized out>, dopager=dopager@entry=1)
    at /usr/src/sys/ddb/db_command.c:482
#4  0xffffffff804c81cd in db_command_loop ()
    at /usr/src/sys/ddb/db_command.c:535
#5  0xffffffff804cb806 in db_trap (type=<optimized out>, code=<optimized out>)
    at /usr/src/sys/ddb/db_main.c:270
#6  0xffffffff80c566fb in kdb_trap (type=type@entry=3, code=code@entry=0,
    tf=tf@entry=0xfffffe0119a83bb0) at /usr/src/sys/kern/subr_kdb.c:733
#7  0xffffffff810e75ca in trap (frame=0xfffffe0119a83bb0)
    at /usr/src/sys/amd64/amd64/trap.c:609
#8  <signal handler called>
#9  kdb_enter (why=0xffffffff812e5eaf "panic", msg=<optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:506
#10 0xffffffff80c08c50 in vpanic (
    fmt=0xffffffff8122606d "refcount %p wraparound",
    ap=ap@entry=0xfffffe0119a83d10) at /usr/src/sys/kern/kern_shutdown.c:908
#11 0xffffffff80c089e3 in panic (
    fmt=0xffffffff81e8cf40 <cnputs_mtx> "\332#*\201\377\377\377\377")
    at /usr/src/sys/kern/kern_shutdown.c:844
#12 0xffffffff80ba9180 in _refcount_update_saturated (count=0xfffff801cc119284)
    at /usr/src/sys/sys/refcount.h:55
#13 refcount_releasen (count=0xfffff801cc119284, n=1)
    at /usr/src/sys/sys/refcount.h:154
#14 refcount_release (count=0xfffff801cc119284)
    at /usr/src/sys/sys/refcount.h:174
#15 closef (fp=<optimized out>, td=0xfffffe00df8d0560)
    at /usr/src/sys/kern/kern_descrip.c:2776
#16 0xffffffff80bad587 in closefp_impl (fdp=0xfffffe012b7c0430, fd=4,
    fp=0xfffff801cc119280, td=0xfffffe00df8d0560, audit=true)
    at /usr/src/sys/kern/kern_descrip.c:1300
#17 0xffffffff810e838e in syscallenter (td=<optimized out>)
    at /usr/src/sys/amd64/amd64/../../kern/subr_syscall.c:189
#18 amd64_syscall (td=0xfffffe00df8d0560, traced=0)
    at /usr/src/sys/amd64/amd64/trap.c:1191
#19 <signal handler called>
#20 0x00003309a531b62a in ?? ()
Backtrace stopped: Cannot access memory at address 0x3309a2802bc8
(kgdb)




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