https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225640
Bug ID: 225640
Summary: gbde: panic: mtx_lock() of spin mutex when orphaned
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: asom...@freebsd.org
destroying a gbde device works fine, but orphaning it causes the following
panic:
panic: mtx_lock() of spin mutex (null) @
/usr/home/somers/freebsd/base/head/sys/kern/kern_mutex.c:186
cpuid = 3
time = 1517613029
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfe47d850
vpanic() at vpanic+0x18d/frame 0xfe47d8b0
vpanic() at vpanic/frame 0xfe47d930
__mtx_lock_flags() at __mtx_lock_flags+0x163/frame 0xfe47d980
_sleep() at _sleep+0x405/frame 0xfe47da30
g_bde_worker() at g_bde_worker+0x214/frame 0xfe47da70
fork_exit() at fork_exit+0x84/frame 0xfe47dab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfe47dab0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
This is on FreeBSD 12.0-CURRENT amd64 at r328767 (1-Feb-2018).
Steps to reproduce:
[somers@fbsd12 ~]$ sudo mdconfig -a -s 1m
md0
[somers@fbsd12 ~]$ sudo gnop create md0
[somers@fbsd12 ~]$ sudo gbde init md0.nop -P xxx
[somers@fbsd12 ~]$ sudo gbde attach md0.nop -p xxx
[somers@fbsd12 ~]$ sudo gnop destroy -f md0.nop
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