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Date:      Wed, 17 Apr 2019 10:12:52 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 237329] Panic in __mtx_lock_sleep() during reboot or shutdown
Message-ID:  <bug-237329-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D237329

            Bug ID: 237329
           Summary: Panic in __mtx_lock_sleep() during reboot or shutdown
           Product: Base System
           Version: 12.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: Trond.Endrestol@ximalas.info

During reboot or shutdown of
FreeBSD FQDN 12.0-STABLE FreeBSD 12.0-STABLE #1 r345045: Tue Mar 12 03:43:08
CET 2019     root@FQDN:/usr/obj/usr/src/amd64.amd64/sys/PE1950  amd64 12005=
03
1200503
this happens:

Fatal trap 12: page fault while in kernel mode
cpuid =3D 0; apic id =3D 00
fault virtual address   =3D 0x410
fault code              =3D supervisor read data  , page not present
instruction pointer     =3D 0x20:0xffffffff807ea33d
stack pointer           =3D 0x28:0xfffffe005ad3c8d0
frame pointer           =3D 0x28:0xfffffe005ad3c960
code segment            =3D base 0x0, limit 0xfffff, type 0x1b
                        =3D DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
current process         =3D 12 (swi4: clock (0))
trap number             =3D 12
panic: page fault
cpuid =3D 0
time =3D 1555402802
KDB: stack backtrace:
db_trace_self_wrapper() at 0xffffffff8054125b =3D
db_trace_self_wrapper+0x2b/frame 0xfffffe005ad3c570
vpanic() at 0xffffffff8080aae4 =3D vpanic+0x1b4/frame 0xfffffe005ad3c5d0
panic() at 0xffffffff8080a923 =3D panic+0x43/frame 0xfffffe005ad3c630
trap_fatal() at 0xffffffff80b76244 =3D trap_fatal+0x394/frame 0xfffffe005ad=
3c690
trap_pfault() at 0xffffffff80b762a9 =3D trap_pfault+0x49/frame 0xfffffe005a=
d3c6f0
trap() at 0xffffffff80b7588f =3D trap+0x29f/frame 0xfffffe005ad3c800
calltrap() at 0xffffffff80b514c5 =3D calltrap+0x8/frame 0xfffffe005ad3c800
--- trap 0xc, rip =3D 0xffffffff807ea33d, rsp =3D 0xfffffe005ad3c8d0, rbp =
=3D
0xfffffe005ad3c960 ---
__mtx_lock_sleep() at 0xffffffff807ea33d =3D __mtx_lock_sleep+0xbd/frame
0xfffffe005ad3c960
mld_fasttimo() at 0xffffffff80a3ae32 =3D mld_fasttimo+0x492/frame
0xfffffe005ad3ca50
pffasttimo() at 0xffffffff80899fa4 =3D pffasttimo+0x54/frame 0xfffffe005ad3=
ca80
softclock_call_cc() at 0xffffffff80824e0e =3D softclock_call_cc+0x12e/frame
0xfffffe005ad3cb30
softclock() at 0xffffffff808252f9 =3D softclock+0x79/frame 0xfffffe005ad3cb=
50
ithread_loop() at 0xffffffff807cd824 =3D ithread_loop+0x1d4/frame
0xfffffe005ad3cbb0
fork_exit() at 0xffffffff807ca2d3 =3D fork_exit+0x83/frame 0xfffffe005ad3cb=
f0
fork_trampoline() at 0xffffffff80b524be =3D fork_trampoline+0xe/frame
0xfffffe005ad3cbf0
--- trap 0, rip =3D 0, rsp =3D 0, rbp =3D 0 ---
Uptime: 34d16h8m2s
Dumping 4593 out of 12258 MB:..1%..11%..21%..31%..41%..51%..61%..71%..81%..=
91%

The system runs a custom kernel. The configuration file will be added short=
ly.
/etc/rc.conf specifies ddb_enable=3D"YES".

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