ixgbe(4) spin lock held too long

[Sean Bruno]

On Mon, 2014-09-08 at 12:09 -0700, Sean Bruno wrote:
> This sort of looks like the hardware failed to respond to us in time?
> Too busy?
> 
> sean
> 
This seems to be affecting my 10/stable machines from 15Aug2014.  

Not a lot of churn in the code so I don't think this is new.  The
afflicted machines, quite a few by my count, appear to have not been
super busy (pushing about 200 Mb/s).

sean



> 
> panic: spin lock held too long
> 
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> 
> Unread portion of the kernel message buffer:
> spin lock 0xffffffff812a0400 (callout) held by 0xfffff800151fe000 (tid
> 100003) too long
> panic: spin lock held too long
> cpuid = 4
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> 0xfffffe1f292752b0
> panic() at panic+0x155/frame 0xfffffe1f29275330
> _mtx_lock_spin_cookie() at _mtx_lock_spin_cookie+0x243/frame
> 0xfffffe1f29275390
> callout_lock() at callout_lock+0xd4/frame 0xfffffe1f292753d0
> callout_reset_sbt_on() at callout_reset_sbt_on+0x10b/frame
> 0xfffffe1f29275450
> tcp_timer_activate() at tcp_timer_activate+0xe7/frame 0xfffffe1f29275470
> tcp_do_segment() at tcp_do_segment+0x96/frame 0xfffffe1f292755b0
> tcp_input() at tcp_input+0xeed/frame 0xfffffe1f292756f0
> ip_input() at ip_input+0x97/frame 0xfffffe1f29275740
> netisr_dispatch_src() at netisr_dispatch_src+0x62/frame
> 0xfffffe1f292757b0
> ether_demux() at ether_demux+0x126/frame 0xfffffe1f292757e0
> ether_nh_input() at ether_nh_input+0x349/frame 0xfffffe1f29275840
> netisr_dispatch_src() at netisr_dispatch_src+0x62/frame
> 0xfffffe1f292758b0
> tcp_lro_flush() at tcp_lro_flush+0x198/frame 0xfffffe1f292758d0
> ixgbe_rxeof() at ixgbe_rxeof+0x6b3/frame 0xfffffe1f29275990
> ixgbe_msix_que() at ixgbe_msix_que+0xba/frame 0xfffffe1f292759e0
> intr_event_execute_handlers() at intr_event_execute_handlers+0xab/frame
> 0xfffffe1f29275a20
> ithread_loop() at ithread_loop+0x96/frame 0xfffffe1f29275a70
> fork_exit() at fork_exit+0x9a/frame 0xfffffe1f29275ab0
> fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe1f29275ab0
> --- trap 0, rip = 0, rsp = 0xfffffe1f29275b70, rbp = 0 ---
> Uptime: 8d20h4m58s
> 
> 
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