Re: spinlock held too long on reboot

I wrote:

> Syncing disks, vnodes remaining...0 done
> All buffers synced.
> GEOM_MIRROR: Device diesel_root: provider mirror/diesel_root  
> destroyed.
> Uptime: 6m32s
> GEOM_MIRROR: Device diesel_root destroyed.
> Rebooting...
> cpu_reset: Stopping other CPUs
> spin lock 0xffffffff8078c900 (sched lock 1) held by  
> 0xffffff00014d4ab0 (tid 100002) too long
> panic: spin lock held too long
> cpuid = 0
> KDB: enter: panic
> [thread pid 77 tid 100090 ]
> Stopped at      kdb_enter+0x3d: movq    $0,0x48bbd0(%rip)
> db> bt
> Tracing pid 77 tid 100090 td 0xffffff000457bab0
> kdb_enter() at kdb_enter+0x3d
> panic() at panic+0x17b
> _mtx_lock_spin_failed() at _mtx_lock_spin_failed+0x39
> _mtx_lock_spin() at _mtx_lock_spin+0x9e
> _mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x72
> sched_balance_group() at sched_balance_group+0xc5
> sched_balance_group() at sched_balance_group+0x1f8
> sched_balance() at sched_balance+0xa2
> sched_clock() at sched_clock+0xf6
> statclock() at statclock+0xbd
> lapic_handle_timer() at lapic_handle_timer+0x197
> Xtimerint() at Xtimerint+0x8c
> --- interrupt, rip = 0xffffffff80541cc4, rsp = 0xffffff80771dba90,  
> rbp = 0xffffff80771dbab0 ---
> DELAY() at DELAY+0x64
> cpu_reset() at cpu_reset+0xdd
> boot() at boot+0x2e6
> reboot() at reboot+0x42
> syscall() at syscall+0x1a5
> Xfast_syscall() at Xfast_syscall+0xd0
> --- syscall (55, FreeBSD ELF64, reboot), rip = 0x800788eec, rsp =  
> 0x7fffffffeca8, rbp = 0 ---


I've only seen this once.  If I should encounter it again, is there  
something you'd like me to look at?


Stefan

-- 
Stefan Bethke <stb_at_lassitu.de>   Fon +49 151 14070811