panic in sysctl code in recent head

From: Navdeep Parhar <nparhar_at_gmail.com>
Date: Thu, 30 Jul 2015 12:11:22 -0700
A kernel built from head as of today panics with this on loading a module.
Does anyone else see this too?

panic: sleepq_add: td 0xfffff8000e7f89e0 to sleep on wchan
0xffffffff824056c8 with sleeping prohibited
cpuid = 3
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2e/frame
0xfffffe02383ebe40
kdb_backtrace() at kdb_backtrace+0x58/frame 0xfffffe02383ebf10
vpanic() at vpanic+0x25e/frame 0xfffffe02383ebfe0
kassert_panic() at kassert_panic+0xcc/frame 0xfffffe02383ec070
sleepq_add() at sleepq_add+0x1ed/frame 0xfffffe02383ec0e0
_sx_xlock_hard() at _sx_xlock_hard+0xa88/frame 0xfffffe02383ec320
__sx_xlock() at __sx_xlock+0x77/frame 0xfffffe02383ec380
_sx_xlock() at _sx_xlock+0x170/frame 0xfffffe02383ec3f0
_rm_rlock_hard() at _rm_rlock_hard+0x323/frame 0xfffffe02383ec490
_rm_rlock() at _rm_rlock+0x173/frame 0xfffffe02383ec4e0
_rm_rlock_debug() at _rm_rlock_debug+0x284/frame 0xfffffe02383ec560
sysctl_root_handler_locked() at sysctl_root_handler_locked+0x148/frame
0xfffffe02383ec5b0
sysctl_root() at sysctl_root+0x38d/frame 0xfffffe02383ec660
userland_sysctl() at userland_sysctl+0x315/frame 0xfffffe02383ec7a0
sys___sysctl() at sys___sysctl+0xfc/frame 0xfffffe02383ec8a0
syscallenter() at syscallenter+0x521/frame 0xfffffe02383ec980
amd64_syscall() at amd64_syscall+0x2a/frame 0xfffffe02383ecab0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe02383ecab0
--- syscall (202, FreeBSD ELF64, sys___sysctl), rip = 0x8011b02ba, rsp =
0x7fffffffda28, rbp = 0x7fffffffda60 ---
KDB: enter: panic
Received on Thu Jul 30 2015 - 17:11:25 UTC

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