xor_speed hang

gistfile1.txt

Thread 6 (Thread 801e1a800 (LWP 100957)):
#0  do_xor_speed (tmpl=0x9b70c0 <xor_block_8regs>, b1=0x805c68000, b2=0x805c6b000) at crypto/xor.c:84
#1  0x0000000000688a1c in calibrate_xor_blocks () at crypto/xor.c:144
#2  0x0000000000680ac3 in do_one_initcall (fn=0x6889bf <calibrate_xor_blocks>) at init/main.c:794
#3  0x0000000000680c7b in do_initcall_level (level=<optimized out>) at init/main.c:859
#4  do_initcalls () at init/main.c:867
#5  do_basic_setup () at init/main.c:885
#6  kernel_init_freeable () at init/main.c:1010
#7  0x000000000067d799 in kernel_init (unused=0x9b70c0 <xor_block_8regs>) at init/main.c:938
#8  0x0000000000404548 in thread_bootstrap (_tba=0x805c1e138) at arch/lkl/kernel/threads.c:139
#9  0x0000000800bd07f9 in thread_start (curthread=0x801e1a800) at /usr/home/cmeyer/src/CURRENT.svn/lib/libthr/thread/thr_create.c:288
#10 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffdf9fb000

84                      while ((now = jiffies) == j)
85                              cpu_relax();

Nothing updates jiffies — timer hardclock not firing?

This reproduces on a Linux host as well:

(gdb) bt
#0  do_xor_speed (tmpl=0x9ab860 <xor_block_8regs>, b1=0x7fbeac0ac000, b2=0xfffedb08) at crypto/xor.c:84
#1  0x000000000068f92c in calibrate_xor_blocks () at crypto/xor.c:144
#2  0x0000000000687a3c in do_one_initcall (fn=0x68f8cf <calibrate_xor_blocks>) at init/main.c:794
#3  0x0000000000687be4 in do_initcall_level (level=<optimized out>) at init/main.c:859
#4  do_initcalls () at init/main.c:867
#5  do_basic_setup () at init/main.c:885
#6  kernel_init_freeable () at init/main.c:1010
#7  0x0000000000683d29 in kernel_init (unused=0x9ab860 <xor_block_8regs>) at init/main.c:938
#8  0x0000000000403138 in thread_bootstrap (_tba=0x7fbeac063138) at arch/lkl/kernel/threads.c:139
#9  0x00007fbeb2bd7555 in start_thread (arg=0x7fbeb1e06700) at pthread_create.c:333
#10 0x00007fbeb270ab9d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109
(gdb) l
...
81		for (i = 0; i < 5; i++) {
82			j = jiffies;
83			count = 0;
84			while ((now = jiffies) == j)
85				cpu_relax();
...