Re: panic: _mtx_lock_sleep: recursed on non-recursive mutex em0 _at_ /usr/src/sys/dev/e1000/if_lem.c:881

On 2012-07-26 17:46, David Wolfskill wrote:
> This is at r238795; cut/paste of backtrace:
> 
> KDB: enter: panic
> [ thread pid 12 tid 100026 ]
> Stopped at      kdb_enter+0x3d: movl    $0,kdb_why
> db> bt
> Tracing pid 12 tid 100026 td 0xc6755000
> kdb_enter(c0f93c5f,c0f93c5f,c0f91e21,f08398f0,c1825c80,...) at kdb_enter+0x3d
> panic(c0f91e21,c66739a0,c0f20db8,371,c6755000,...) at panic+0x1c4
> _mtx_lock_sleep(c68b8560,c6755000,c0f20db8,c0f20db8,371,...) at _mtx_lock_sleep+0x35e
> _mtx_lock_flags(c68b8560,0,c0f20db8,371,0,...) at _mtx_lock_flags+0xdb
> lem_start(c68ba000,0,c0fa806c,d20,2a,...) at lem_start+0x33
> if_transmit(c68ba000,c93d9000,6,c6755000,c65da588,...) at if_transmit+0x129
> ether_output(c68ba000,c93d9000,f0839aa4,0,0,...) at ether_output+0x5df
> arpintr(c93d9000,8,c0f50314,153,0,...) at arpintr+0x108c
> netisr_dispatch_src(7,0,c93d9000,c93d9000,c68ba000,c93d0806) at netisr_dispatch_src+0xa7
> netisr_dispatch(7,c93d9000,c93d9000,10,3,...) at netisr_dispatch+0x20
> ether_demux(c68ba000,c93d9000,3,0,3,...) at ether_demux+0x133
> ether_nh_input(c93d9000,c8f012c8,644d6000,c9492d00,0,...) at ether_nh_input+0x329
> netisr_dispatch_src(9,0,c93d9000,e2e,2,1) at netisr_dispatch_src+0xa7
> netisr_dispatch(9,c93d9000) at netisr_dispatch+0x20
> ether_input(c68ba000,c93d9000,c0f20db8,e2e,c11454c0,...) at ether_input+0x21
> lem_intr(c68b6000,8,c0f8e00d,561,0,...) at lem_intr+0x567
> intr_event_execute_handlers(c11454c0,c6626200,c0f8e00d,561,c6755000,...) at intr_event_execute_handlers+0xc5
> ithread_loop(c6627730,f0839d08,c0f8dd64,3db,0,...) at ithread_loop+0xe2
> fork_exit(c0a2dcb0,c6627730,f0839d08) at fork_exit+0x7c
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0, eip = 0, esp = 0xf0839d40, ebp = 0 ---
> db> show locks
> exclusive sleep mutex em0 (EM TX Lock) r = 0 (0xc68b8560) locked _at_ /usr/src/sys/dev/e1000/if_lem.c:1324
> exclusive sleep mutex em0 (EM Core Lock) r = 0 (0xc68b854c) locked _at_ /usr/src/sys/dev/e1000/if_lem.c:1302
> db> 
> 
> I need to head off to a meeting; I can poke at the machine a bit more
> in a couple of hours or so.

I get the same panic and backtrace here, while running as a VMware
guest.  At least, as soon something actually happens with the network.