Andrew Morton wrote:
On Tue, 11 Jul 2006 11:13:00 -0700
"Keith Mannthey" <[email protected]> wrote:
Hello,
I just tried booting 2.6.18-rc1-mm1 (I was booting 2.6.17-mm6 just
fine) and got the following error on boot.
CPU 15: synchronized TSC with CPU 0 (last diff 49 cycles, maxerr 4698 cycles)
Brought up 16 CPUs
testing NMI watchdog ... OK.
time.c: Using 333.333333 MHz WALL PIT GTOD PIT/HPET timer.
time.c: Detected 3002.570 MHz processor.
migration_cost=9,1121,16845
checking if image is initramfs... it is
Freeing initrd memory: 2770k freed
NMI Watchdog detected LOCKUP on CPU 8
CPU 8
Modules linked in:
Pid: 51, comm: khelper Not tainted 2.6.18-rc1-mm1-smp #2
RIP: 0010:[<ffffffff803dd6f5>] [<ffffffff803dd6f5>]
.text.lock.spinlock+0x31/0x8a
RSP: 0000:ffff81065f91be70 EFLAGS: 00000086
RAX: 0000000000000000 RBX: ffff810476ce3380 RCX: 0000000000000000
RDX: ffff81046fad4108 RSI: ffff81046fad4000 RDI: ffff810476ce3384
RBP: ffff810476ce3380 R08: 0000000000000000 R09: 000000000036f849
R10: 0000000000000000 R11: 0000000000000002 R12: ffff81065f91bf04
R13: ffff81065f91bef8 R14: ffff810476dcdd18 R15: ffffffff8023f7a8
FS: 0000000000000000(0000) GS:ffff810476f79140(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
Process khelper (pid: 51, threadinfo ffff81065f91a000, task ffff81046fedd080)
Stack: ffffffff803dd040 ffff81047003f8c0 ffff81065f91bef8 ffff810476dcdd18
0000000000000246 ffff81046fad4108 ffff810476ce3380 ffff81046fad4108
ffffffff8025b211 0000000000000000 0000000000000000 ffff81046fedd080
Call Trace:
[<ffffffff803dd040>] __down_read+0x12/0x9a
[<ffffffff8025b211>] taskstats_exit_alloc+0x59/0x8a
[<ffffffff80232e89>] do_exit+0x178/0x8f6
[<ffffffff8023f940>] request_module+0x0/0x150
[<ffffffff8020a05a>] child_rip+0x8/0x12
[<ffffffff8023f7a8>] __call_usermodehelper+0x0/0x47
[<ffffffff8023f866>] ____call_usermodehelper+0x0/0xda
[<ffffffff8020a052>] child_rip+0x0/0x12
Code: 7e f9 e9 d3 fe ff ff f3 90 83 3b 00 7e f9 e9 da fe ff ff e8
console shuts up ...
Any ideas, have we seen this? I can attach config and full dmesg if needed.
Thanks. Shailabh sent the below patch through yesterday. It looks awfully
similar.
Yes, this lockup on boot is caused by not initializing the per-cpu
semaphores early enough. The patch below should fix it.
--Shailabh
From: Shailabh Nagar <[email protected]>
Shift initialization of semaphores taken on exit() path to earlier in the
bootup sequence. Without this fix, booting on large cpu machines hangs at
down_read() called on one of the per-cpu semaphores declared in taskstats.
Signed-off-by: Shailabh Nagar <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
kernel/taskstats.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff -puN kernel/taskstats.c~per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-2 kernel/taskstats.c
--- a/kernel/taskstats.c~per-task-delay-accounting-taskstats-interface-control-exit-data-through-cpumasks-fix-2
+++ a/kernel/taskstats.c
@@ -501,15 +501,20 @@ static struct genl_ops taskstats_ops = {
/* Needed early in initialization */
void __init taskstats_init_early(void)
{
+ unsigned int i;
+
taskstats_cache = kmem_cache_create("taskstats_cache",
sizeof(struct taskstats),
0, SLAB_PANIC, NULL, NULL);
+ for_each_possible_cpu(i) {
+ INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
+ init_rwsem(&(per_cpu(listener_array, i).sem));
+ }
}
static int __init taskstats_init(void)
{
int rc;
- unsigned int i;
rc = genl_register_family(&family);
if (rc)
@@ -519,11 +524,6 @@ static int __init taskstats_init(void)
if (rc < 0)
goto err;
- for_each_possible_cpu(i) {
- INIT_LIST_HEAD(&(per_cpu(listener_array, i).list));
- init_rwsem(&(per_cpu(listener_array, i).sem));
- }
-
family_registered = 1;
return 0;
err:
_
-
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