I am investigating why on 1 particular machine we get these soft lockup
errors.
When looking at following code in kernel/softlockup.c is it possible for
the touch time stamps get swapped over due to pre-emption and the wrong
touch_timestamp is compared against wrong current time, there by causing
a false soft lockup message.
Should softlockup.c be changed to call get_cpu() rather then
smp_processor_id()
void softlockup_tick(void)
{
int this_cpu = smp_processor_id();
unsigned long touch_timestamp = per_cpu(touch_timestamp, this_cpu);
Thanks
Adrian Cornish
------------------------------------------------------------------------
--------------------------
Jan 5 07:12:46 qlbqp1 ntpd[3149]: synchronized to 172.18.40.2, stratum
2
Jan 5 07:17:53 qlbqp1 kernel: BUG: soft lockup - CPU#2 stuck for 10s!
[swapper:0]
Jan 5 07:17:53 qlbqp1 kernel: CPU 2:
Jan 5 07:17:53 qlbqp1 kernel: Modules linked in: ipv6 xfrm_nalgo
crypto_api sunrpc dm_mirror dm_mod video sbs backlight i2c_ec i2c_core
button battery asus_acpi acpi_memhotplug ac parport_pc lp parport
ata_piix libata shpchp i5000_edac bnx2 ide_cd edac_mc e1000e cdrom
serio_raw pcspkr sg megaraid_sas sd_mod scsi_mod ext3 jbd ehci_hcd
ohci_hcd uhci_hcd
Jan 5 07:17:53 qlbqp1 kernel: Pid: 0, comm: swapper Not tainted
2.6.18-92.1.18.el5 #1
Jan 5 07:17:53 qlbqp1 kernel: RIP: 0010:[<ffffffff80056d38>]
[<ffffffff80056d38>] mwait_idle+0x36/0x4a
Jan 5 07:17:53 qlbqp1 kernel: RSP: 0018:ffff8101043e3ea0 EFLAGS:
00000246
Jan 5 07:17:53 qlbqp1 kernel: RAX: 0000000000000000 RBX:
ffff81012ececca0 RCX: 0000000000000000
Jan 5 07:17:53 qlbqp1 kernel: RDX: 0000000000000000 RSI:
0000000000000082 RDI: ffffffff8049276c
Jan 5 07:17:53 qlbqp1 kernel: RBP: 0000000000000000 R08:
ffff8101043e2000 R09: ffff8101043e3ecc
Jan 5 07:17:53 qlbqp1 kernel: R10: ffff810001014f00 R11:
ffff810001014f00 R12: 0000000000000000
Jan 5 07:17:53 qlbqp1 kernel: R13: 0000000000000010 R14:
0000000000000001 R15: 0000001100000000
Jan 5 07:17:53 qlbqp1 kernel: FS: 0000000000000000(0000)
GS:ffff81010439cec0(0000) knlGS:0000000000000000
Jan 5 07:17:53 qlbqp1 kernel: CS: 0010 DS: 0018 ES: 0018 CR0:
000000008005003b
Jan 5 07:17:53 qlbqp1 kernel: CR2: 00000000033760c8 CR3:
00000000b12c8000 CR4: 00000000000006e0
Jan 5 07:17:53 qlbqp1 kernel:
Jan 5 07:17:53 qlbqp1 kernel: Call Trace:
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff80186d1f>]
acpi_processor_idle+0x1a6/0x463
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff80186b79>]
acpi_processor_idle+0x0/0x463
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff80186b79>]
acpi_processor_idle+0x0/0x463
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff80048b85>] cpu_idle+0x95/0xb8
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff800767c7>]
start_secondary+0x45a/0x469
Jan 5 07:17:53 qlbqp1 kernel:
Jan 5 07:17:53 qlbqp1 kernel: BUG: soft lockup - CPU#5 stuck for 10s!
[domproc:3645]
Jan 5 07:17:53 qlbqp1 kernel: CPU 5:
Jan 5 07:17:53 qlbqp1 kernel: Modules linked in: ipv6 xfrm_nalgo
crypto_api sunrpc dm_mirror dm_mod video sbs backlight i2c_ec i2c_core
button battery asus_acpi acpi_memhotplug ac parport_pc lp parport
ata_piix libata shpchp i5000_edac bnx2 ide_cd edac_mc e1000e cdrom
serio_raw pcspkr sg megaraid_sas sd_mod scsi_mod ext3 jbd ehci_hcd
ohci_hcd uhci_hcd
Jan 5 07:17:53 qlbqp1 kernel: Pid: 3645, comm: domproc Not tainted
2.6.18-92.1.18.el5 #1
Jan 5 07:17:53 qlbqp1 kernel: RIP: 0010:[<ffffffff80064ba4>]
[<ffffffff80064ba4>] .text.lock.spinlock+0x2/0x30
Jan 5 07:17:53 qlbqp1 kernel: RSP: 0018:ffff8100b8099f00 EFLAGS:
00000282
Jan 5 07:17:53 qlbqp1 kernel: RAX: 0000000000000002 RBX:
0000000000000001 RCX: 0000000000000002
Jan 5 07:17:53 qlbqp1 kernel: RDX: ffff8101269e7c10 RSI:
0000000000010002 RDI: ffff8101275c30d0
Jan 5 07:17:53 qlbqp1 kernel: RBP: 000000000000000e R08:
00040e09096000e0 R09: 0000000000000001
Jan 5 07:17:53 qlbqp1 kernel: R10: 0000000000000025 R11:
0000000000000800 R12: 0000000049620877
Jan 5 07:17:53 qlbqp1 kernel: R13: 00000000f2cea28a R14:
00007fff95c0ec40 R15: 0000000000000008
Jan 5 07:17:53 qlbqp1 kernel: FS: 00002abe14e9f670(0000)
GS:ffff81012fc1e540(0000) knlGS:0000000000000000
Jan 5 07:17:53 qlbqp1 kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
000000008005003b
Jan 5 07:17:53 qlbqp1 kernel: CR2: 0000000015aebff0 CR3:
00000000b8087000 CR4: 00000000000006e0
Jan 5 07:17:53 qlbqp1 kernel:
Jan 5 07:17:53 qlbqp1 kernel: Call Trace:
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff80113566>] ipc_lock+0x2c/0x3f
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff80114086>]
do_msgsnd+0x81/0x315
Jan 5 07:17:53 qlbqp1 kernel: [<ffffffff8005d28d>] tracesys+0xd5/0xe0
Jan 5 07:17:53 qlbqp1 kernel:
Jan 5 07:24:30 qlbqp1 ntpd[3149]: synchronized to 172.18.40.3, stratum
2
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