Hi, Theodore.
I've got this while booting kernel with ubsan:
[ 0.000000]
================================================================================
[ 0.000000] UBSan: Undefined behaviour in
../include/linux/bitops.h:107:33
[ 0.000000] shift exponent 32 is to large for 32-bit type 'unsigned int'
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.18.0-rc1+ #64
[ 0.000000] 0000000000000020 0000000000000000 0000000000000000
ffffffff83003c68
[ 0.000000] ffffffff82add58a 000000000000009f 0000000000000020
ffffffff83003c78
[ 0.000000] ffffffff819a4519 ffffffff83003d28 ffffffff819a4a05
ffffffff82df889d
[ 0.000000] Call Trace:
[ 0.000000] dump_stack (/home/andrew/linux/ubsan_x86//lib/dump_stackc:52)
[ 0.000000] ubsan_epilogue (/home/andrew/linux/ubsan_x86//lib/ubsanc:159)
[ 0.000000] __ubsan_handle_shift_out_of_bounds
(/home/andrew/linux/ubsan_x86//lib/ubsanc:458)
[ 0.000000] ? dmi_string_nosave
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:51)
[ 0.000000] ? dmi_string
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:72)
[ 0.000000] ? dmi_save_ident
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:159)
[ 0.000000] _mix_pool_bytes
(/home/andrew/linux/ubsan_x86//include/linux/bitopsh:107
/home/andrew/linux/ubsan_x86//drivers/char/randomc:509)
[ 0.000000] ? dmi_decode
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:376)
[ 0.000000] ? dmi_walk_early
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:127)
[ 0.000000] add_device_randomness
(/home/andrew/linux/ubsan_x86//drivers/char/randomc:747)
[ 0.000000] ? dmi_save_one_device
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:375)
[ 0.000000] ? dmi_save_one_device
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:375)
[ 0.000000] dmi_walk_early
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:127)
[ 0.000000] dmi_present
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:497)
[ 0.000000] dmi_scan_machine
(/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:555)
[ 0.000000] setup_arch
(/home/andrew/linux/ubsan_x86//arch/x86/kernel/setupc:1022)
[ 0.000000] ? printk
(/home/andrew/linux/ubsan_x86//kernel/printk/printkc:1849)
[ 0.000000] ? early_idt_handlers
(/home/andrew/linux/ubsan_x86//arch/x86/kernel/head_64S:344)
[ 0.000000] start_kernel
(/home/andrew/linux/ubsan_x86//include/linux/bitmaph:162
/home/andrew/linux/ubsan_x86//include/linux/cpumaskh:333
/home/andrew/linux/ubsan_x86//include/linux/mm_typesh:464
/home/andrew/linux/ubsan_x86//init/mainc:532)
[ 0.000000] ? early_idt_handlers
(/home/andrew/linux/ubsan_x86//arch/x86/kernel/head_64S:344)
[ 0.000000] x86_64_start_reservations
(/home/andrew/linux/ubsan_x86//arch/x86/kernel/head64c:194)
[ 0.000000] x86_64_start_kernel
(/home/andrew/linux/ubsan_x86//arch/x86/kernel/head64c:183)
[ 0.000000]
================================================================================
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