[Fedora-xen] Re: [Xen-ia64-devel] Fedora-xen-ia64 test status

[Akio Takebe]

Hi, Xen/IA64 people

When I boot the dom0, I get some __might_sleep()'s messages.

BUG: sleeping function called from invalid context at kernel/rwsem.c:20
in_atomic():0, irqs_disabled():1

Call Trace:
 [<a00000010001c7a0>] show_stack+0x40/0xa0
                                sp=e00000002f7dfbb0 bsp=e00000002f7d91a8
 [<a00000010001c830>] dump_stack+0x30/0x60
                                sp=e00000002f7dfd80 bsp=e00000002f7d9190
 [<a00000010006c920>] __might_sleep+0x2a0/0x2c0
                                sp=e00000002f7dfd80 bsp=e00000002f7d9168
 [<a0000001000bce80>] down_read+0x20/0x60
                                sp=e00000002f7dfd80 bsp=e00000002f7d9148
 [<a0000001005b14f0>] ia64_do_page_fault+0x110/0x9e0
                                sp=e00000002f7dfd80 bsp=e00000002f7d90f8
 [<a000000100064be0>] xen_leave_kernel+0x0/0x3b0
                                sp=e00000002f7dfe30 bsp=e00000002f7d90f8


Do we need CONFIG_DEBUG_SPINLOCK_SLEEP?
If we need CONFIG_DEBUG_SPINLOCK_SLEEP, we must modify __might_sleep().

6073 void __might_sleep(char *file, int line)
6074 {
6075 #if defined(in_atomic)
6076         static unsigned long prev_jiffy;        /* ratelimiting */
6077 
6078         if ((in_atomic() || irqs_disabled()) &&
6079             system_state == SYSTEM_RUNNING && !oops_in_progress) {
6080                 if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy) <<<<this
6081                         return;
6082                 prev_jiffy = jiffies;
6083                 printk(KERN_ERR "Debug: sleeping function called from invalid"
6084                                 " context at %s:%d\n", file, line);
6085                 printk("in_atomic():%d, irqs_disabled():%d\n",
6086                         in_atomic(), irqs_disabled());
6087                 dump_stack();
6088         }
6089 #endif
6090 }


Best Regards,

Akio Takebe
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