On Sun, 23 Feb 2014, Vince Weaver wrote:
>
> and as far as I can tell nothing touches rbp again until the segfault.
> Nothing in _memset_sse2 does as far as I can tell.
I only know enough about ftrace to be dangerous, but here is what I think
is the trace of the problem:
perf_fuzzer-11492 [000] 197077.488363: function:
intel_get_event_constraints
perf_fuzzer-11492 [000] 197077.488363: function:
intel_pebs_constraints
perf_fuzzer-11492 [000] 197077.488365: function:
intel_put_event_constraints
perf_fuzzer-11492 [000] 197077.488365: function:
intel_pmu_enable_all
perf_fuzzer-11492 [000] 197077.488366: function:
intel_pmu_pebs_enable_all
perf_fuzzer-11492 [000] 197077.488367: function:
intel_pmu_lbr_enable_all
perf_fuzzer-11492 [000] 197077.488366: function:
intel_pmu_pebs_enable_all
perf_fuzzer-11492 [000] 197077.488367: function:
intel_pmu_lbr_enable_all
perf_fuzzer-11492 [000] 197077.488368: function: mutex_unlock
perf_fuzzer-11492 [000] 197077.488368: function: mutex_lock
perf_fuzzer-11492 [000] 197077.488369: function:
_cond_resched
perf_fuzzer-11492 [000] 197077.488370: function:
_raw_spin_lock_irq
perf_fuzzer-11492 [000] 197077.488370: function: mutex_unlock
perf_fuzzer-11492 [000] 197077.488371: function: mutex_lock
perf_fuzzer-11492 [000] 197077.488371: function:
_cond_resched
perf_fuzzer-11492 [000] 197077.488372: function:
_raw_spin_lock_irq
perf_fuzzer-11492 [000] 197077.488373: function: mutex_unlock
perf_fuzzer-11492 [000] 197077.488373: function: mutex_lock
perf_fuzzer-11492 [000] 197077.488374: function:
_cond_resched
perf_fuzzer-11492 [000] 197077.488374: function:
_raw_spin_lock_irq
perf_fuzzer-11492 [000] 197077.488375: function:
smp_call_function_single
perf_fuzzer-11492 [000] 197077.488376: function: _raw_spin_lock
perf_fuzzer-11492 [000] 197077.488377: function: mutex_unlock
perf_fuzzer-11492 [000] 197077.488378: function: mutex_lock
perf_fuzzer-11492 [000] 197077.488378: function:
_cond_resched
perf_fuzzer-11492 [000] 197077.488379: function:
_raw_spin_lock_irq
perf_fuzzer-11492 [000] 197077.488380: function:
smp_call_function_single
perf_fuzzer-11492 [000] 197077.488380: function: _raw_spin_lock
perf_fuzzer-11492 [000] 197077.488381: function: mutex_unlock
perf_fuzzer-11492 [000] 197077.488382: function: mutex_unlock
perf_fuzzer-11492 [000] 197077.488383: function:
syscall_trace_leave
perf_fuzzer-11492 [000] 197077.488383: sys_exit: NR 1073741981
= 0
perf_fuzzer-11492 [000] 197077.488387: function:
do_device_not_available
perf_fuzzer-11492 [000] 197077.488387: function:
math_state_restore
perf_fuzzer-11492 [000] 197077.488390: function:
trace_do_page_fault
perf_fuzzer-11492 [000] 197077.488391: page_fault_user:
address=__per_cpu_end ip=__per_cpu_end error_code=0x6
perf_fuzzer-11492 [000] 197077.488395: function: perf_callchain
perf_fuzzer-11492 [000] 197077.488396: function:
copy_from_user_nmi
perf_fuzzer-11492 [000] 197077.488397: function:
trace_do_page_fault
perf_fuzzer-11492 [000] 197077.488398: page_fault_kernel:
address=irq_stack_union ip=copy_user_generic_string error_code=0x0
perf_fuzzer-11492 [000] 197077.488399: function:
__do_page_fault
perf_fuzzer-11492 [000] 197077.488400: function:
bad_area_nosemaphore
perf_fuzzer-11492 [000] 197077.488401: function:
__bad_area_nosemaphore
perf_fuzzer-11492 [000] 197077.488401: function:
no_context
perf_fuzzer-11492 [000] 197077.488402: function:
fixup_exception
perf_fuzzer-11492 [000] 197077.488403: function:
search_exception_tables
perf_fuzzer-11492 [000] 197077.488403: function:
search_extable
perf_fuzzer-11492 [000] 197077.488405: function:
copy_user_handle_tail
perf_fuzzer-11492 [000] 197077.488406: function:
trace_do_page_fault
perf_fuzzer-11492 [000] 197077.488406: page_fault_kernel:
address=irq_stack_union ip=copy_user_handle_tail error_code=0x0
perf_fuzzer-11492 [000] 197077.488407: function:
__do_page_fault
perf_fuzzer-11492 [000] 197077.488408: function:
bad_area_nosemaphore
perf_fuzzer-11492 [000] 197077.488409: function:
__bad_area_nosemaphore
perf_fuzzer-11492 [000] 197077.488409: function:
no_context
perf_fuzzer-11492 [000] 197077.488410: function:
fixup_exception
perf_fuzzer-11492 [000] 197077.488410: function:
search_exception_tables
perf_fuzzer-11492 [000] 197077.488411: function:
search_extable
perf_fuzzer-11492 [000] 197077.488413: function:
perf_output_begin
perf_fuzzer-11492 [000] 197077.488414: function:
perf_output_copy
perf_fuzzer-11492 [000] 197077.488415: function:
perf_output_copy
perf_fuzzer-11492 [000] 197077.488415: function:
perf_output_copy
perf_fuzzer-11492 [000] 197077.488416: function:
perf_output_copy
perf_fuzzer-11492 [000] 197077.488418: function:
perf_output_copy
perf_fuzzer-11492 [000] 197077.488419: function:
perf_output_copy
perf_fuzzer-11492 [000] 197077.488419: function:
perf_output_end
perf_fuzzer-11492 [000] 197077.488420: function:
perf_output_put_handle
perf_fuzzer-11492 [000] 197077.488421: function:
__do_page_fault
perf_fuzzer-11492 [000] 197077.488422: function:
down_read_trylock
perf_fuzzer-11492 [000] 197077.488423: function:
_cond_resched
perf_fuzzer-11492 [000] 197077.488423: function: find_vma
perf_fuzzer-11492 [000] 197077.488424: function: bad_area
perf_fuzzer-11492 [000] 197077.488425: function: up_read
perf_fuzzer-11492 [000] 197077.488426: function:
__bad_area_nosemaphore
perf_fuzzer-11492 [000] 197077.488426: function:
is_prefetch
perf_fuzzer-11492 [000] 197077.488427: function:
convert_ip_to_linear
perf_fuzzer-11492 [000] 197077.488428: function:
unhandled_signal
perf_fuzzer-11492 [000] 197077.488429: function:
__printk_ratelimit
perf_fuzzer-11492 [000] 197077.488430: function:
_raw_spin_trylock
perf_fuzzer-11492 [000] 197077.488430: function:
_raw_spin_unlock_irqrestore
perf_fuzzer-11492 [000] 197077.488431: function:
printk
perf_fuzzer-11492 [000] 197077.488432: function:
vprintk_emit
perf_fuzzer-11492 [000] 197077.488434: function:
_raw_spin_lock
perf_fuzzer-11492 [000] 197077.488443: function:
cont_add
perf_fuzzer-11492 [000] 197077.488444: function:
console_trylock
perf_fuzzer-11492 [000] 197077.488445: function:
down_trylock
perf_fuzzer-11492 [000] 197077.488445: function:
_raw_spin_lock_irqsave
perf_fuzzer-11492 [000] 197077.488446: function:
_raw_spin_unlock_irqrestore
perf_fuzzer-11492 [000] 197077.488447: function:
console_unlock
perf_fuzzer-11492 [000] 197077.488447: function:
_raw_spin_lock_irqsave
perf_fuzzer-11492 [000] 197077.488449: function:
print_time
perf_fuzzer-11492 [000] 197077.488452: function:
T.950
perf_fuzzer-11492 [000] 197077.488453: console:
[197179.420735] perf_fuzzer[11492]: segfault at 22e0 ip 000000000041efab sp
00000000ffda0938 error 6
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