panic: deadlres_td_sleep_q: possible deadlock detected on RPI3

[bob prohaska]

On Thu, Jan 30, 2020 at 11:24:19AM -0800, Mark Millard wrote:
> 
> If you want to risk crashing/hanging-up the machine, you could
> try to "kldload mac_ntpd" and see if it loads well or not.
> 
> 
That produced a prompt hang with no output at all. The backtrace reports:

KDB: enter: Break to debugger
[ thread pid 1116 tid 100085 ]
Stopped at      0x4031ed44
db> bt
Tracing pid 1116 tid 100085 td 0xfffffd0001020000
db_trace_self() at db_stack_trace+0xf8
         pc = 0xffff00000073c55c  lr = 0xffff000000103c58
         sp = 0xffff00005a4bc830  fp = 0xffff00005a4bc860

db_stack_trace() at db_command+0x228
         pc = 0xffff000000103c58  lr = 0xffff0000001038d0
         sp = 0xffff00005a4bc870  fp = 0xffff00005a4bc950

db_command() at db_command_loop+0x58
         pc = 0xffff0000001038d0  lr = 0xffff000000103678
         sp = 0xffff00005a4bc960  fp = 0xffff00005a4bc980

db_command_loop() at db_trap+0xf4
         pc = 0xffff000000103678  lr = 0xffff00000010697c
         sp = 0xffff00005a4bc990  fp = 0xffff00005a4bcbb0

db_trap() at kdb_trap+0x1d8
         pc = 0xffff00000010697c  lr = 0xffff0000004510a0
         sp = 0xffff00005a4bcbc0  fp = 0xffff00005a4bcc70
        
kdb_trap() at do_el1h_sync+0xf4
         pc = 0xffff0000004510a0  lr = 0xffff000000759568
         sp = 0xffff00005a4bcc80  fp = 0xffff00005a4bccb0

do_el1h_sync() at handle_el1h_sync+0x78
         pc = 0xffff000000759568  lr = 0xffff00000073f078
         sp = 0xffff00005a4bccc0  fp = 0xffff00005a4bcdd0

handle_el1h_sync() at kdb_alt_break_internal+0x130
         pc = 0xffff00000073f078  lr = 0xffff000000450858
         sp = 0xffff00005a4bcde0  fp = 0xffff00005a4bce80

kdb_alt_break_internal() at kdb_alt_break+0xc
         pc = 0xffff000000450858  lr = 0xffff000000450718
         sp = 0xffff00005a4bce90  fp = 0xffff00005a4bce90

kdb_alt_break() at uart_intr_rxready+0x88
         pc = 0xffff000000450718  lr = 0xffff000000263124
         sp = 0xffff00005a4bcea0  fp = 0xffff00005a4bcec0
        
uart_intr_rxready() at uart_intr+0xec
         pc = 0xffff000000263124  lr = 0xffff000000263e0c
         sp = 0xffff00005a4bced0  fp = 0xffff00005a4bcf00

uart_intr() at intr_event_handle+0xc8
         pc = 0xffff000000263e0c  lr = 0xffff0000003cbaf4
         sp = 0xffff00005a4bcf10  fp = 0xffff00005a4bcf50

intr_event_handle() at intr_isrc_dispatch+0x34
         pc = 0xffff0000003cbaf4  lr = 0xffff00000078faa4
         sp = 0xffff00005a4bcf60  fp = 0xffff00005a4bcf70

intr_isrc_dispatch() at bcm2835_intc_intr+0xa8
         pc = 0xffff00000078faa4  lr = 0xffff000000729a50
         sp = 0xffff00005a4bcf80  fp = 0xffff00005a4bcfc0

bcm2835_intc_intr() at intr_event_handle+0xc8
         pc = 0xffff000000729a50  lr = 0xffff0000003cbaf4
         sp = 0xffff00005a4bcfd0  fp = 0xffff00005a4bd010
        
intr_event_handle() at intr_isrc_dispatch+0x34
         pc = 0xffff0000003cbaf4  lr = 0xffff00000078faa4
         sp = 0xffff00005a4bd020  fp = 0xffff00005a4bd030

intr_isrc_dispatch() at bcm_lintc_intr+0x1e8
         pc = 0xffff00000078faa4  lr = 0xffff00000072fc88
         sp = 0xffff00005a4bd040  fp = 0xffff00005a4bd0c0

bcm_lintc_intr() at intr_irq_handler+0x74
         pc = 0xffff00000072fc88  lr = 0xffff00000078f904
         sp = 0xffff00005a4bd0d0  fp = 0xffff00005a4bd0f0

intr_irq_handler() at handle_el1h_irq+0x74
         pc = 0xffff00000078f904  lr = 0xffff00000073f140
         sp = 0xffff00005a4bd100  fp = 0xffff00005a4bd210

handle_el1h_irq() at rms_wlock+0x124
         pc = 0xffff00000073f140  lr = 0xffff000000403fc4
         sp = 0xffff00005a4bd220  fp = 0xffff00005a4bd2b0
        
rms_wlock() at rms_wlock+0x124
         pc = 0xffff000000403fc4  lr = 0xffff000000403fc4
         sp = 0xffff00005a4bd2c0  fp = 0xffff00005a4bd360

rms_wlock() at mac_policy_modevent+0xc0
         pc = 0xffff000000403fc4  lr = 0xffff00000066ba44
         sp = 0xffff00005a4bd370  fp = 0xffff00005a4bd3c0

mac_policy_modevent() at module_register_init+0xc4
         pc = 0xffff00000066ba44  lr = 0xffff0000003e783c
         sp = 0xffff00005a4bd3d0  fp = 0xffff00005a4bd400

module_register_init() at linker_load_module+0xab8
         pc = 0xffff0000003e783c  lr = 0xffff0000003d8670
         sp = 0xffff00005a4bd410  fp = 0xffff00005a4bd740

linker_load_module() at kern_kldload+0xec
         pc = 0xffff0000003d8670  lr = 0xffff0000003d9e40
         sp = 0xffff00005a4bd750  fp = 0xffff00005a4bd780
        
kern_kldload() at sys_kldload+0x64
         pc = 0xffff0000003d9e40  lr = 0xffff0000003d9f98
         sp = 0xffff00005a4bd790  fp = 0xffff00005a4bd7b0

sys_kldload() at do_el0_sync+0x514
         pc = 0xffff0000003d9f98  lr = 0xffff000000759bf4
         sp = 0xffff00005a4bd7c0  fp = 0xffff00005a4bd860

do_el0_sync() at handle_el0_sync+0x90
         pc = 0xffff000000759bf4  lr = 0xffff00000073f224
         sp = 0xffff00005a4bd870  fp = 0xffff00005a4bd980

handle_el0_sync() at 0x210368
         pc = 0xffff00000073f224  lr = 0x0000000000210368
         sp = 0xffff00005a4bd990  fp = 0x0000ffffffffeaf0

db> 

Thanks for the suggestion!

bob prohaska