Re: Analyzed/Solved/Bisected: Booting 2.6.30-rc2-git7 very slow

From: jim owens
Date: Sat Jun 20 2009 - 17:17:23 EST

Matthew Wilcox wrote:
On Sat, Jun 20, 2009 at 08:36:25PM +0200, Kay Sievers wrote:
Ah, I see. There is no tool around udev, I know of, which does this.

Maybe someone is still using the broken-by-design libsysfs, which
opens _every_ file it can find in /sys, even when not asked for
anything specific.

I did consider that option, but dismissed it ... I didn't think anyone
was using something that old.

My test is a fresh RHEL 4.3 install with 2.6.30-rc8. Whatever
scripts are running are stock redhat and I'm still in initrd
so what would I be looking for?

The initrd timeouts all seem to be triggered by the insmod and
only 1 more vpd read happens in init 3 at the end after HAL starts.

This is the BUG() I set to ID (maybe incorrectly)
that the vpd reads were comming from udev:

[ 5.260664] ------------[ cut here ]------------
[ 5.260667] kernel BUG at /root/linux-2.6.30-rc8/drivers/pci/access.c:207!
[ 5.260671] invalid opcode: 0000 [#1] SMP
[ 5.260675] last sysfs file: /sys/devices/pci0000:00/0000:00:02.0/0000:02:00.2/0000:04:03.0/msi_bus
[ 5.260678] CPU 1
[ 5.260681] Modules linked in: cciss(+) sd_mod scsi_mod
[ 5.260689] Pid: 476, comm: udev Not tainted 2.6.30-rc8 #33 ProLiant DL380 G4
[ 5.260692] RIP: 0010:[<ffffffff803b282f>] [<ffffffff803b282f>] pci_vpd_pci22_wait+0xef/0x100
[ 5.260703] RSP: 0018:ffff8801199e7dd8 EFLAGS: 00010246
[ 5.260706] RAX: 0000000000000000 RBX: ffff88011ad60440 RCX: 0000000000001001
[ 5.260709] RDX: 0000000000007c7b RSI: 0000000000000001 RDI: ffffffff8072c160
[ 5.260712] RBP: ffff8801199e7e08 R08: 0000000000000001 R09: 0000000000000001
[ 5.260715] R10: 0000000000000000 R11: 0000000000000006 R12: ffff88011ac8d800
[ 5.260718] R13: 00000000fffee028 R14: ffff88011ac8d800 R15: ffff88011992e000
[ 5.260722] FS: 0000000000000000(0000) GS:ffff88002edd9000(0000) knlGS:0000000000000000
[ 5.260725] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 5.260728] CR2: 00000000022562b8 CR3: 00000001198ef000 CR4: 00000000000006e0
[ 5.260731] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 5.260734] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 5.260738] Process udev (pid: 476, threadinfo ffff8801199e6000, task ffff88011b78c3c0)
[ 5.260740] Stack:
[ 5.260742] ffff8801199e7e08 0000ffff803b268d 0000000000001000 0000000000000000
[ 5.260746] 0000000000000000 ffff88011ad60440 ffff8801199e7e68 ffffffff803b292c
[ 5.260752] ffffffff803455f6 ffff88011ad60458 0000000000001000 0000000000001000
[ 5.260757] Call Trace:
[ 5.260760] [<ffffffff803b292c>] pci_vpd_pci22_read+0xec/0x170
[ 5.260765] [<ffffffff803455f6>] ? read+0x96/0x1b0
[ 5.260771] [<ffffffff803b22a9>] pci_read_vpd+0x29/0x40
[ 5.260775] [<ffffffff803bab06>] read_vpd_attr+0x46/0x50
[ 5.260780] [<ffffffff803456fb>] read+0x19b/0x1b0
[ 5.260784] [<ffffffff80363566>] ? security_file_permission+0x16/0x20
[ 5.260790] [<ffffffff802e3f5d>] vfs_read+0xbd/0x190
[ 5.260797] [<ffffffff802e4365>] sys_read+0x55/0x90
[ 5.260801] [<ffffffff8020b71b>] system_call_fastpath+0x16/0x1b
[ 5.260807] Code: c9 c3 8b 35 74 33 fe 00 31 c0 4c 89 e2 48 c7 c7 ed 89 6a 80 e8 b3 3d e9 ff 8b 05 5d 33 fe 00 ff c0 89 05 55 33 fe 00 ff c8 75 04 <0f> 0b eb fe b8 92 ff ff ff e9 35 ff ff ff 66 66 90 55 48 89 e5
[ 5.260845] RIP [<ffffffff803b282f>] pci_vpd_pci22_wait+0xef/0x100
[ 5.260849] RSP <ffff8801199e7dd8>
[ 5.260854] ---[ end trace 37f1683404a28980 ]---


here is a single user boot with a timeout printk() and a hack
in mkinitrd to sleep before and after the insmod cciss:

[ 3.858278] NET: Registered protocol family 17
[ 3.864293] Freeing unused kernel memory: 2416k freed
Red Hat nash version 4.2.1.6 starting
Mounted /proc filesystem
Mounting sysfs
Creating /dev
Starting udev
[ 3.876470] udev used greatest stack depth: 5632 bytes left
Loading scsi_mod.ko module
[ 3.977087] SCSI subsystem initialized
Loading sd_mod.ko module
[ 3.987672] Driver 'sd' needs updating - please use bus_type methods
[ 4.280095] input: AT Translated Set 2 keyboard as /class/input/input0
[ 4.626432] input: PS/2 Generic Mouse as /class/input/input1
JIM sleep 1
Loading cciss.ko module
[ 4.999782] HP CISS Driver (v 3.6.20)
[ 5.003771] cciss 0000:04:03.0: PCI INT A -> GSI 51 (level, low) -> IRQ 51
[ 5.052021] IRQ 51/cciss0: IRQF_DISABLED is not guaranteed on shared IRQs
[ 5.059001] cciss0: <0x46> at PCI 0000:04:03.0 IRQ 51 using DAC
[ 5.065800] blocks= 71122560 block_size= 512
[ 5.070602] heads=255, sectors=32, cylinders=8716
[ 5.070603]
[ 5.077428] blocks= 71122560 block_size= 512
[ 5.082151] heads=255, sectors=32, cylinders=8716
[ 5.082153]
[ 5.089413] cciss/c0d0: p1
[ 5.131820] blocks= 71122560 block_size= 512
[ 5.139627] heads=255, sectors=32, cylinders=8716
[ 5.139629]
[ 5.146117] blocks= 71122560 block_size= 512
[ 5.150887] heads=255, sectors=32, cylinders=8716
[ 5.150889]
[ 5.157577] cciss/c0d1: p1
[ 5.160261] TIMEOUT 1 ffff88011ad54800
[ 5.164164] p2 p3
[ 5.208880] blocks= 142253280 block_size= 512
[ 5.215732] heads=255, sectors=32, cylinders=17433
[ 5.215734]
[ 5.223191] blocks= 142253280 block_size= 512
[ 5.227965]
[ 5.227966] TIMEOUT 2 ffff88011ad54800
[ 5.232942] heads=255, sectors=32, cylinders=17433
[ 5.232944]
[ 5.239516] cciss/c0d2: p1 p2 p3
[ 5.292263]
[ 5.292265] TIMEOUT 3 ffff88011ad54800
[ 5.356262]
[ 5.356263] TIMEOUT 4 ffff88011ad54800
[ 5.420266]
[ 5.420267] TIMEOUT 5 ffff88011ad54800
[ 5.484855]
[ 5.484857] TIMEOUT 6 ffff88011ad54800
[ 5.491980] blocks= 71122560 block_size= 512
[ 5.496991] heads=255, sectors=32, cylinders=8716
[ 5.496993]
[ 5.503484] blocks= 71122560 block_size= 512
[ 5.508761] heads=255, sectors=32, cylinders=8716
[ 5.508763]
[ 5.515729] cciss/c0d3: p1
[ 5.548263]
[ 5.548264] TIMEOUT 7 ffff88011ad54800
[ 5.610138] work_for_cpu used greatest stack depth: 4592 bytes left
[ 5.612264]
[ 5.612266] TIMEOUT 8 ffff88011ad54800
[ 5.674223]
[ 5.674224] TIMEOUT 9 ffff88011ad54800
[ 5.736261]
[ 5.736263] TIMEOUT 10 ffff88011ad54800
[ 5.800261]
[ 5.800263] TIMEOUT 11 ffff88011ad54800
[ 5.864259]
[ 5.864260] TIMEOUT 12 ffff88011ad54800
[ 5.928259]
[ 5.928260] TIMEOUT 13 ffff88011ad54800
[ 5.992011]
[ 5.992012] TIMEOUT 14 ffff88011ad54800
[ 6.056011]
[ 6.056012] TIMEOUT 15 ffff88011ad54800
[ 6.120011]
[ 6.120013] TIMEOUT 16 ffff88011ad54800
[ 6.184011]
[ 6.184012] TIMEOUT 17 ffff88011ad54800
[ 6.248011]
[ 6.248012] TIMEOUT 18 ffff88011ad54800
[ 6.312011]
[ 6.312012] TIMEOUT 19 ffff88011ad54800
[ 6.376011]
[ 6.376013] TIMEOUT 20 ffff88011ad54800
JIM sleep 1
Loading jbd.ko module
Loading ext3.ko module
Creating root device
Mounting root filesystem
[ 6.760540] kjournald starting. Commit interval 5 seconds
[ 6.765559] EXT3-fs: mounted filesystem with writeback data mode.
Switching to new root
[ 6.946395] SELinux: Disabled at runtime.
[ 6.950840] type=1404 audit(1245517131.950:2): selinux=0 auid=4294967295 ses=4294967295
INIT: version 2.85 booting
[ 7.235810] uname used greatest stack depth: 4296 bytes left
[ 7.304350] awk used greatest stack depth: 3688 bytes left
Welcome to Red Hat Enterprise Linux AS
Press 'I' to enter interactive startup.
Starting udev: [ OK ]
Initializing hardware... storage network audio done[ OK ]
Configuring kernel parameters: [ OK ]
Setting clock (utc): Sat Jun 20 12:59:02 EDT 2009 [ OK ]
Setting hostname dl380.lnx.usa.hp.com: [ OK ]
Checking root filesystem
[/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/cciss/c0d1p3
/1: clean, 348377/4177920 files, 2477319/8351791 blocks
[ OK ]
Remounting root filesystem in read-write mode: [ OK ]
No devices found
no block devices found
Setting up Logical Volume Management: [ OK ]
Checking filesystems
Checking all file systems.
[/sbin/fsck.ext3 (1) -- /boot] fsck.ext3 -a /dev/cciss/c0d1p1
/boot12: clean, 46/26104 files, 26042/104388 blocks
[ OK ]
Mounting local filesystems: [ OK ]
Enabling local filesystem quotas: [ OK ]
Enabling swap space: [ OK ]
sh-3.00#

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