On Mon, Jan 07, 2013 at 03:54:23PM -0800, Xin Li wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 > > Hi, > > I've recently (by mid-December I think) noticed that sysctl -a can > sometimes cause kernel trap 12. Tried enabling INVARIANTS and the > problem mysteriously disappeared. After some experiments on this, it > seems that this can be triggered by sysctl -a but the system have an 1 > in 10 chance to survive. When INVARIANTS is enabled however, I can > not trigger the panic. "sysctl hw" triggers the panic sometimes, but > not always. > > Do anybody have clue on this? The system hangs hard when it panics so > kernel debugger won't work. When it panics, the fault instruction > pointer is always 0x20:0xffffffff808d61c9, which is > sys/kern/subr_turnstile.c:297: > > > /* Resort td on the list if needed. */ if > > (!turnstile_adjust_thread(ts, td)) { mtx_unlock_spin(&ts->ts_lock); > > // 297 // return; } > > This sounds like a race condition but I haven't yet able to track it > down... Could you try to isolate the sub-leaf under hw which causes the panic ? Just shot in the dark, do you have Intel GPU gemified driver loaded ?
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