Hi Greg,
I debugged a bit between meetings:
(gdb)
335 rc = dev->set_next_event((unsigned long) clc, dev);
Here we crash in early boot because set_next_event is NULL:
(gdb) p *dev
$4 = {event_handler = 0xc03cc2e8 <tick_handle_periodic>, set_next_event = 0x0,
set_next_ktime = 0x0, next_event = 10000000, max_delta_ns = 34359738352,
min_delta_ns = 1000, mult = 268435456, shift = 32,
state_use_accessors = CLOCK_EVT_STATE_ONESHOT, features = 2, retries = 0,
set_state_periodic = 0x0, set_state_oneshot = 0x0, set_state_oneshot_stopped =
0xc0cd1178 <arch_timer_shutdown_virt>,
set_state_shutdown = 0xc0cd1178 <arch_timer_shutdown_virt>, tick_resume =
0x0, broadcast = 0x0, suspend = 0x0, resume = 0x0, min_delta_ticks = 15,
max_delta_ticks = 2147483647, name = 0xc1361bf4 "arch_sys_timer", rating = 450,
irq = 18, bound_on = 0, cpumask = 0xc0f073f0 <cpu_bit_bitmap+4>, list = {next
= 0xc17320cc <clockevent_devices>, prev = 0xc17320cc <clockevent_devices>},
owner = 0x0, ipipe_timer = 0xef7a6b40, ipipe_stolen = 0}
(gdb) bt
#0 clockevents_program_event (dev=0xef7ab340, expires=10000000, force=false)
at ../kernel/time/clockevents.c:335
#1 0xc03cc610 in tick_setup_periodic (broadcast=<optimized out>,
dev=<optimized out>) at ../kernel/time/tick-common.c:172
#2 tick_setup_periodic (dev=0xef7ab340, broadcast=<optimized out>) at
../kernel/time/tick-common.c:149
#3 0xc03cc8e4 in tick_check_new_device (newdev=0xef7ab340) at
../kernel/time/tick-common.c:370
#4 0xc03cb650 in clockevents_register_device (dev=0xef7ab340) at
../kernel/time/clockevents.c:468
#5 0xc03cbb54 in clockevents_config_and_register (dev=<optimized out>,
freq=<optimized out>, min_delta=<optimized out>, max_delta=<optimized out>) at
../kernel/time/clockevents.c:515
#6 0xc0cd14f4 in __arch_timer_setup (clk=<optimized out>, type=<optimized
out>) at ../drivers/clocksource/arm_arch_timer.c:873
#7 arch_timer_starting_cpu (cpu=<optimized out>) at
../drivers/clocksource/arm_arch_timer.c:963
#8 0xc03482b8 in cpuhp_invoke_callback (cpu=0,
state=CPUHP_AP_ARM_ARCH_TIMER_STARTING, bringup=<optimized out>,
node=<optimized out>, lastp=0x0) at ../kernel/cpu.c:173
#9 0xc0348c28 in cpuhp_invoke_ap_callback (node=<optimized out>,
bringup=<optimized out>, state=<optimized out>, cpu=<optimized out>) at
../kernel/cpu.c:753
#10 cpuhp_issue_call (cpu=<optimized out>, state=<optimized out>,
bringup=<optimized out>, node=<optimized out>) at ../kernel/cpu.c:1660
#11 0xc0348f34 in __cpuhp_setup_state_cpuslocked (state=<optimized out>,
name=<optimized out>, invoke=<optimized out>, startup=0xc0cd1388
<arch_timer_starting_cpu>, teardown=0xc0cd1244 <arch_timer_dying_cpu>,
multi_instance=<optimized out>) at ../kernel/cpu.c:1807
#12 0xc0349128 in __cpuhp_setup_state (state=CPUHP_AP_ARM_ARCH_TIMER_STARTING,
name=0xc1361b2c "clockevents/arm/arch_timer:starting", invoke=true,
startup=0xc0cd1388 <arch_timer_starting_cpu>, teardown=0xc0cd1244
<arch_timer_dying_cpu>,
multi_instance=false) at ../kernel/cpu.c:1836
#13 0xc15b1f58 in cpuhp_setup_state (teardown=<optimized out>,
startup=<optimized out>, name=<optimized out>, state=<optimized out>) at
../include/linux/cpuhotplug.h:213
#14 arch_timer_register () at ../drivers/clocksource/arm_arch_timer.c:1209
#15 arch_timer_of_init (np=<optimized out>) at
../drivers/clocksource/arm_arch_timer.c:1386
#16 0xc15ad7cc in timer_probe () at ../drivers/clocksource/timer-probe.c:30
#17 0xc1500d80 in start_kernel () at ../init/main.c:699
#18 0x00000000 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
Are we missing some config switch for this virt machine, or is there
something else in I-pipe broken?
Jan
--
Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux
