Re: [PATCH 6/6]suspend/resume SMP support

[Li Shaohua <shaohua.li@intel.com>]

On Wed, 2005-04-13 at 16:32, Pavel Machek wrote:
> root@hobit:/sys/devices/system/cpu/cpu1# dmesg | tail -25
>  [<c011d001>] activate_task+0x1/0xa0
>  [<c011d128>] resched_task+0x68/0x90
>  [<c011d8ba>] try_to_wake_up+0x2aa/0x2f0
>  [<c025ed7a>] fbcon_cursor+0x19a/0x270
>  [<c02c4958>] hide_cursor+0x18/0x30
>  [<c02c758f>] vt_console_print+0x24f/0x260
>  [<c02c7340>] vt_console_print+0x0/0x260
>  [<c01247e7>] __call_console_drivers+0x57/0x60
>  [<c01248e0>] call_console_drivers+0x80/0x110
>  [<c0124d8e>] release_console_sem+0x4e/0xc0
>  [<c0124c12>] vprintk+0x192/0x240
>  [<c0528891>] preempt_schedule_irq+0x51/0x80
>  [<c02adeca>] acpi_processor_idle+0x0/0x265
>  [<c010325e>] need_resched+0x1f/0x21
>  [<c02adeca>] acpi_processor_idle+0x0/0x265
>  [<c0124a77>] printk+0x17/0x20
>  [<c010b583>] cpu_init+0x73/0x360
>  [<c0117bd6>] start_secondary+0x6/0x170
> Code: d2 74 bd fc 8b 44 24 28 b9 0e 00 00 00 8b 74 24 14 01 c6 b8 0e
> 00 00 00 89 74 24 1c 8b 74 24 30 89 44 24 10 8b 7c 24 1c 83 c6 10 <f3>
> a5 8b 74 24 24 8b 44 24 1c 89 4c 24 10 01 ee f7 d5 21 ee 89
>  <0>Kernel panic - not syncing: Attempted to kill the idle task!
>  Stuck ??
> Inquiring remote APIC #0...
> ... APIC #0 ID: 00000000
> ... APIC #0 VERSION: 00040011
> ... APIC #0 SPIV: 000000ff
> root@hobit:/sys/devices/system/cpu/cpu1#
Andrew,
Below patch fixed Pavel's oops. But strange is the 'system_state' check
is added for CPU hotplug by Rusty. This really makes me confused. Could
you please look at it.
This can be reproduced 100% with radeonfb driver load. Attached is the
dmesg of an oops. It seems the 'objp' parameter for
'cache_alloc_debugcheck_after' is invalid.

Thanks,
Shaohua

--- a/kernel/printk.c	2005-04-12 10:12:19.000000000 +0800
+++ b/kernel/printk.c	2005-04-13 17:22:40.912897328 +0800
@@ -624,8 +624,7 @@ asmlinkage int vprintk(const char *fmt, 
 			log_level_unknown = 1;
 	}
 
-	if (!cpu_online(smp_processor_id()) &&
-	    system_state != SYSTEM_RUNNING) {
+	if (!cpu_online(smp_processor_id())) {
 		/*
 		 * Some console drivers may assume that per-cpu resources have
 		 * been allocated.  So don't allow them to be called by this

CPU0 attaching NULL sched-domain.
CPU1 attaching NULL sched-domain.
CPU0 attaching NULL sched-domain.
Booting processor 1/1 eip 3000
Initializing CPU#1
masked ExtINT on CPU#1
Unable to handle kernel paging request at virtual address f000acb2
 printing eip:
c014e4cc
*pde = 00000000
Oops: 0000 [#1]
PREEMPT SMP 
Modules linked in:
CPU:    1
EIP:    0060:[<c014e4cc>]    Not tainted VLI
EFLAGS: 00010097   (2.6.12-rc2-mm3) 
EIP is at check_poison_obj+0x4c/0x1e0
eax: 0000006b   ebx: 0000005a   ecx: dff6e080   edx: dff6e480
esi: 00000000   edi: f000acb2   ebp: 00000080   esp: c14fdcd4
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 0, threadinfo=c14fc000 task=dff42560)
Stack: dff6e480 5a5a5a5a 5a5a5a5a 0000007f 5a5a5a5a 00000000 0000005a f000acae 
       dff6e480 c021192e c0150031 dff6e480 f000acae 5a5a5a5a 5a5a5a5a dff6e480 
       00000046 00000020 00000010 c015044b dff6e480 00000020 f000acae c021192e 
Call Trace:
 [<c021192e>] soft_cursor+0x5e/0x260
 [<c0150031>] cache_alloc_debugcheck_after+0x181/0x1a0
 [<c015044b>] __kmalloc+0x9b/0xd0
 [<c021192e>] soft_cursor+0x5e/0x260
 [<c021192e>] soft_cursor+0x5e/0x260
 [<c020a459>] bit_cursor+0x339/0x540
 [<c0118998>] recalc_task_prio+0x88/0x150
 [<c0205c32>] fbcon_cursor+0x1a2/0x270
 [<c0265475>] hide_cursor+0x25/0x40
 [<c026843a>] vt_console_print+0x2aa/0x2b0
 [<c0120d32>] __call_console_drivers+0x62/0x70
 [<c0120e66>] call_console_drivers+0x96/0x130
 [<c0121361>] release_console_sem+0x51/0xc0
 [<c01211df>] vprintk+0x19f/0x250
 [<c01264b6>] __do_softirq+0xd6/0xf0
 [<c0438f5b>] preempt_schedule_irq+0x4b/0x80
 [<c0121037>] printk+0x17/0x20
 [<c0114132>] setup_local_APIC+0xe2/0x1d0
 [<c01130ba>] smp_callin+0x7a/0x120
 [<c011316e>] start_secondary+0xe/0x190
Code: 24 30 89 14 24 01 c7 e8 13 f8 ff ff 39 44 24 14 89 c5 0f 8d b7 00 00 00 8d 40 ff 89 44 24 0c 3b 74 24 0c b0 6b 0f 84 8c 01 00 00 <38> 04 3e 74 46 8b 44 24 14 85 c0 0f 84 48 01 00 00 89 3c 24 83 
 <0>Kernel panic - not syncing: Attempted to kill the idle task!
 Stuck ??
Inquiring remote APIC #1...
... APIC #1 ID: failed
... APIC #1 VERSION: failed
... APIC #1 SPIV: failed