[Bug 226510] panic: Re-refing for reason 5, cnt = 1

Tue Mar 20 08:22:47 UTC 2018

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226510

--- Comment #15 from Roman Bogorodskiy <novel at FreeBSD.org> ---
(In reply to Roman Bogorodskiy from comment #14)

One more panic:

Tue Mar 20 12:18:17 +04 2018

FreeBSD kloomba 12.0-CURRENT FreeBSD 12.0-CURRENT #9 r331097: Sat Mar 17
22:30:10 +04 2018     root at romashka:/usr/obj/usr/src/amd64.amd64/sys/GENERIC 
amd64

panic: Re-refing for reason 5, cnt = 1

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Reading symbols from /boot/kernel/kernel...Reading symbols from
/usr/lib/debug//boot/kernel/kernel.debug...done.
done.

Unread portion of the kernel message buffer:
panic: Re-refing for reason 5, cnt = 1
cpuid = 1
time = 1521533405
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe005b97f820
vpanic() at vpanic+0x18d/frame 0xfffffe005b97f880
panic() at panic+0x43/frame 0xfffffe005b97f8e0
damediapoll() at damediapoll+0xa7/frame 0xfffffe005b97f900
softclock_call_cc() at softclock_call_cc+0x150/frame 0xfffffe005b97f9b0
softclock() at softclock+0x7c/frame 0xfffffe005b97f9e0
intr_event_execute_handlers() at intr_event_execute_handlers+0x99/frame
0xfffffe005b97fa20
ithread_loop() at ithread_loop+0xb7/frame 0xfffffe005b97fa70
fork_exit() at fork_exit+0x84/frame 0xfffffe005b97fab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe005b97fab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic

__curthread () at ./machine/pcpu.h:230
230     ./machine/pcpu.h: No such file or directory.
(kgdb) #0  __curthread () at ./machine/pcpu.h:230
#1  doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:347
#2  0xffffffff8041d36b in db_dump (dummy=<optimized out>, 
    dummy2=<unavailable>, dummy3=<unavailable>, dummy4=<unavailable>)
    at /usr/src/sys/ddb/db_command.c:574
#3  0xffffffff8041d139 in db_command (last_cmdp=<optimized out>, 
    cmd_table=<optimized out>, dopager=<optimized out>)
    at /usr/src/sys/ddb/db_command.c:481
#4  0xffffffff8041ceb4 in db_command_loop ()
    at /usr/src/sys/ddb/db_command.c:534
#5  0xffffffff804200df in db_trap (type=<optimized out>, code=<optimized out>)
    at /usr/src/sys/ddb/db_main.c:250
#6  0xffffffff80b2c063 in kdb_trap (type=3, code=-61456, tf=<optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:697
#7  0xffffffff80f9e868 in trap (frame=0xfffffe005b97f750)
    at /usr/src/sys/amd64/amd64/trap.c:547
#8  <signal handler called>
#9  kdb_enter (why=0xffffffff8120cb7e "panic", msg=<optimized out>)
    at /usr/src/sys/kern/subr_kdb.c:479
#10 0xffffffff80ae6e2a in vpanic (fmt=<optimized out>, ap=0xfffffe005b97f8c0)
    at /usr/src/sys/kern/kern_shutdown.c:801
#11 0xffffffff80ae6eb3 in panic (
    fmt=0xffffffff81be33f8 <cnputs_mtx> "|f\035\201\377\377\377\377")
    at /usr/src/sys/kern/kern_shutdown.c:739
#12 0xffffffff8036a187 in da_periph_acquire (periph=<optimized out>, 
    token=DA_REF_TUR) at /usr/src/sys/cam/scsi/scsi_da.c:1574
#13 damediapoll (arg=0xfffff80004c68c00)
    at /usr/src/sys/cam/scsi/scsi_da.c:5704
#14 0xffffffff80afed60 in softclock_call_cc (c=0xfffffe0069ea9a68, 
    cc=0xffffffff81df2b00 <cc_cpu>, direct=<optimized out>)
    at /usr/src/sys/kern/kern_timeout.c:731
#15 0xffffffff80aff12c in softclock (arg=0xffffffff81df2b00 <cc_cpu>)
    at /usr/src/sys/kern/kern_timeout.c:869
#16 0xffffffff80aa9d29 in intr_event_execute_handlers (p=<optimized out>, 
    ie=0xfffff80003805b00) at /usr/src/sys/kern/kern_intr.c:1338
#17 0xffffffff80aaa417 in ithread_execute_handlers (ie=<optimized out>, 
    p=<optimized out>) at /usr/src/sys/kern/kern_intr.c:1351
#18 ithread_loop (arg=0xfffff800038200e0)
    at /usr/src/sys/kern/kern_intr.c:1432
#19 0xffffffff80aa7164 in fork_exit (
    callout=0xffffffff80aaa360 <ithread_loop>, arg=0xfffff800038200e0, 
    frame=0xfffffe005b97fac0) at /usr/src/sys/kern/kern_fork.c:1039
#20 <signal handler called>
(kgdb)

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