On Wednesday 22 November 2006 11:57, Jens Axboe wrote:
> On Wed, Nov 22 2006, Jesper Juhl wrote:
> > On 22/11/06, Jens Axboe <[email protected]> wrote:
> > >On Tue, Nov 21 2006, Linus Torvalds wrote:
> > >> I don't think we use any irq-disable locking in the VM itself, but I
> > >could
> > >> imagine some nasty situation with the block device layer getting into a
> > >> deadlock with interrupts disabled when it runs out of queue entries and
> > >> cannot allocate more memory..
> > >
> > >Not likely. Request allocation is done with GFP_NOIO and backed by a
> > >memory pool, so as long the vm doesn't go totally nuts because
> > >__GFP_WAIT is set, we should be safe there. If it did go crazy, I
> > >suspect a sysrq-t would still work.
> > >
> > >If bouncing is involved for swap, we do have a potential deadlock issue
> > >that isn't fixed yet. I just whipped up this completely untested patch,
> > >it should shed some light on that issue.
> > >
> > Thanks Jens, I'll apply that later tonight and force a few lockups and
> > see if I get any extra details with that patch.
>
> Can you post a full dmesg too, as well as clarify which device holds the
> swap space?
>
Here's a complete dmesg from a fresh boot :
Linux version 2.6.19-rc6-g66c669ba (juhl@dragon) (gcc version 3.4.6) #2 SMP PREEMPT Fri Nov 24 00:37:24 CET 2006
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e8000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000007ffb0000 (usable)
BIOS-e820: 000000007ffb0000 - 000000007ffc0000 (ACPI data)
BIOS-e820: 000000007ffc0000 - 000000007fff0000 (ACPI NVS)
BIOS-e820: 000000007fff0000 - 0000000080000000 (reserved)
BIOS-e820: 00000000ff7c0000 - 0000000100000000 (reserved)
1151MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000ff780
Entering add_active_range(0, 0, 524208) 0 entries of 256 used
Zone PFN ranges:
DMA 0 -> 4096
Normal 4096 -> 229376
HighMem 229376 -> 524208
early_node_map[1] active PFN ranges
0: 0 -> 524208
On node 0 totalpages: 524208
DMA zone: 32 pages used for memmap
DMA zone: 0 pages reserved
DMA zone: 4064 pages, LIFO batch:0
Normal zone: 1760 pages used for memmap
Normal zone: 223520 pages, LIFO batch:31
HighMem zone: 2303 pages used for memmap
HighMem zone: 292529 pages, LIFO batch:31
DMI 2.3 present.
ACPI: RSDP (v000 ACPIAM ) @ 0x000f9bb0
ACPI: RSDT (v001 A M I OEMRSDT 0x12000506 MSFT 0x00000097) @ 0x7ffb0000
ACPI: FADT (v002 A M I OEMFACP 0x12000506 MSFT 0x00000097) @ 0x7ffb0200
ACPI: MADT (v001 A M I OEMAPIC 0x12000506 MSFT 0x00000097) @ 0x7ffb0390
ACPI: OEMB (v001 A M I AMI_OEM 0x12000506 MSFT 0x00000097) @ 0x7ffc0040
ACPI: DSDT (v001 939M2 939M2150 0x00000150 INTL 0x02002026) @ 0x00000000
ACPI: PM-Timer IO Port: 0x808
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:3 APIC version 16
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:3 APIC version 16
ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 2, version 17, address 0xfec00000, GSI 0-23
ACPI: IOAPIC (id[0x03] address[0xfec10000] gsi_base[24])
IOAPIC[1]: apic_id 3, version 17, address 0xfec10000, GSI 24-39
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
Enabling APIC mode: Flat. Using 2 I/O APICs
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 88000000 (gap: 80000000:7f7c0000)
Detected 2200.199 MHz processor.
Built 1 zonelists. Total pages: 520113
Kernel command line: BOOT_IMAGE=g66c669ba ro root=801
mapped APIC to ffffd000 (fee00000)
mapped IOAPIC to ffffc000 (fec00000)
mapped IOAPIC to ffffb000 (fec10000)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
CPU 0 irqstacks, hard=c04d5000 soft=c04d3000
PID hash table entries: 4096 (order: 12, 16384 bytes)
Console: colour dummy device 80x25
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES: 8
... MAX_LOCK_DEPTH: 30
... MAX_LOCKDEP_KEYS: 2048
... CLASSHASH_SIZE: 1024
... MAX_LOCKDEP_ENTRIES: 8192
... MAX_LOCKDEP_CHAINS: 8192
... CHAINHASH_SIZE: 4096
memory used by lock dependency info: 904 kB
per task-struct memory footprint: 1200 bytes
------------------------
| Locking API testsuite:
----------------------------------------------------------------------------
| spin |wlock |rlock |mutex | wsem | rsem |
--------------------------------------------------------------------------
A-A deadlock: ok | ok | ok | ok | ok | ok |
A-B-B-A deadlock: ok | ok | ok | ok | ok | ok |
A-B-B-C-C-A deadlock: ok | ok | ok | ok | ok | ok |
A-B-C-A-B-C deadlock: ok | ok | ok | ok | ok | ok |
A-B-B-C-C-D-D-A deadlock: ok | ok | ok | ok | ok | ok |
A-B-C-D-B-D-D-A deadlock: ok | ok | ok | ok | ok | ok |
A-B-C-D-B-C-D-A deadlock: ok | ok | ok | ok | ok | ok |
double unlock: ok | ok | ok | ok | ok | ok |
initialize held: ok | ok | ok | ok | ok | ok |
bad unlock order: ok | ok | ok | ok | ok | ok |
--------------------------------------------------------------------------
recursive read-lock: | ok | | ok |
recursive read-lock #2: | ok | | ok |
mixed read-write-lock: | ok | | ok |
mixed write-read-lock: | ok | | ok |
--------------------------------------------------------------------------
hard-irqs-on + irq-safe-A/12: ok | ok | ok |
soft-irqs-on + irq-safe-A/12: ok | ok | ok |
hard-irqs-on + irq-safe-A/21: ok | ok | ok |
soft-irqs-on + irq-safe-A/21: ok | ok | ok |
sirq-safe-A => hirqs-on/12: ok | ok | ok |
sirq-safe-A => hirqs-on/21: ok | ok | ok |
hard-safe-A + irqs-on/12: ok | ok | ok |
soft-safe-A + irqs-on/12: ok | ok | ok |
hard-safe-A + irqs-on/21: ok | ok | ok |
soft-safe-A + irqs-on/21: ok | ok | ok |
hard-safe-A + unsafe-B #1/123: ok | ok | ok |
soft-safe-A + unsafe-B #1/123: ok | ok | ok |
hard-safe-A + unsafe-B #1/132: ok | ok | ok |
soft-safe-A + unsafe-B #1/132: ok | ok | ok |
hard-safe-A + unsafe-B #1/213: ok | ok | ok |
soft-safe-A + unsafe-B #1/213: ok | ok | ok |
hard-safe-A + unsafe-B #1/231: ok | ok | ok |
soft-safe-A + unsafe-B #1/231: ok | ok | ok |
hard-safe-A + unsafe-B #1/312: ok | ok | ok |
soft-safe-A + unsafe-B #1/312: ok | ok | ok |
hard-safe-A + unsafe-B #1/321: ok | ok | ok |
soft-safe-A + unsafe-B #1/321: ok | ok | ok |
hard-safe-A + unsafe-B #2/123: ok | ok | ok |
soft-safe-A + unsafe-B #2/123: ok | ok | ok |
hard-safe-A + unsafe-B #2/132: ok | ok | ok |
soft-safe-A + unsafe-B #2/132: ok | ok | ok |
hard-safe-A + unsafe-B #2/213: ok | ok | ok |
soft-safe-A + unsafe-B #2/213: ok | ok | ok |
hard-safe-A + unsafe-B #2/231: ok | ok | ok |
soft-safe-A + unsafe-B #2/231: ok | ok | ok |
hard-safe-A + unsafe-B #2/312: ok | ok | ok |
soft-safe-A + unsafe-B #2/312: ok | ok | ok |
hard-safe-A + unsafe-B #2/321: ok | ok | ok |
soft-safe-A + unsafe-B #2/321: ok | ok | ok |
hard-irq lock-inversion/123: ok | ok | ok |
soft-irq lock-inversion/123: ok | ok | ok |
hard-irq lock-inversion/132: ok | ok | ok |
soft-irq lock-inversion/132: ok | ok | ok |
hard-irq lock-inversion/213: ok | ok | ok |
soft-irq lock-inversion/213: ok | ok | ok |
hard-irq lock-inversion/231: ok | ok | ok |
soft-irq lock-inversion/231: ok | ok | ok |
hard-irq lock-inversion/312: ok | ok | ok |
soft-irq lock-inversion/312: ok | ok | ok |
hard-irq lock-inversion/321: ok | ok | ok |
soft-irq lock-inversion/321: ok | ok | ok |
hard-irq read-recursion/123: ok |
soft-irq read-recursion/123: ok |
hard-irq read-recursion/132: ok |
soft-irq read-recursion/132: ok |
hard-irq read-recursion/213: ok |
soft-irq read-recursion/213: ok |
hard-irq read-recursion/231: ok |
soft-irq read-recursion/231: ok |
hard-irq read-recursion/312: ok |
soft-irq read-recursion/312: ok |
hard-irq read-recursion/321: ok |
soft-irq read-recursion/321: ok |
-------------------------------------------------------
Good, all 218 testcases passed! |
---------------------------------
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 2070236k/2096832k available (2333k kernel code, 25428k reserved, 957k data, 224k init, 1179328k highmem)
virtual kernel memory layout:
fixmap : 0xfff81000 - 0xfffff000 ( 504 kB)
pkmap : 0xff800000 - 0xffc00000 (4096 kB)
vmalloc : 0xf8800000 - 0xff7fe000 ( 111 MB)
lowmem : 0xc0000000 - 0xf8000000 ( 896 MB)
.init : 0xc0496000 - 0xc04ce000 ( 224 kB)
.data : 0xc03477c1 - 0xc0436f54 ( 957 kB)
.text : 0xc0100000 - 0xc03477c1 (2333 kB)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 4402.72 BogoMIPS (lpj=2201360)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: 178bfbff e3d3fbff 00000000 00000000 00000001 00000000 00000003
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
CPU 0(2) -> Core 0
CPU: After all inits, caps: 178bfbf7 e3d3fbff 00000000 00000410 00000001 00000000 00000003
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
Checking 'hlt' instruction... OK.
Freeing SMP alternatives: 12k freed
ACPI: Core revision 20060707
CPU0: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ stepping 02
lockdep: not fixing up alternatives.
Booting processor 1/1 eip 2000
CPU 1 irqstacks, hard=c04d6000 soft=c04d4000
Initializing CPU#1
Calibrating delay using timer specific routine.. 4399.52 BogoMIPS (lpj=2199764)
CPU: After generic identify, caps: 178bfbff e3d3fbff 00000000 00000000 00000001 00000000 00000003
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
CPU 1(2) -> Core 1
CPU: After all inits, caps: 178bfbf7 e3d3fbff 00000000 00000410 00000001 00000000 00000003
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: AMD Athlon(tm) 64 X2 Dual Core Processor 4400+ stepping 02
Total of 2 processors activated (8802.24 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
checking TSC synchronization across 2 CPUs:
CPU#0 had -31 usecs TSC skew, fixed it up.
CPU#1 had 31 usecs TSC skew, fixed it up.
Brought up 2 CPUs
migration_cost=387
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: PCI BIOS revision 3.00 entry at 0xf0031, last bus=4
PCI: Using configuration type 1
Setting up standard PCI resources
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Probing PCI hardware (bus 00)
PCI quirk: region 0800-083f claimed by ali7101 ACPI
Boot video device is 0000:03:00.0
PCI: Transparent bridge - 0000:00:06.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P4._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.HTT_._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEB1._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEB2._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 *5 6 7 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 *10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 6 7 *10 11 12 14 15), disabled.
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 *10 11 12 14 15), disabled.
ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKF] (IRQs *3 4 5 6 7 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 10 11 12 14 15) *9
ACPI: PCI Interrupt Link [LNKP] (IRQs 3 4 *5 6 7 10 11 12 14 15)
SCSI subsystem initialized
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq". If it helps, post a report
PCI: Bridge: 0000:00:01.0
IO window: disabled.
MEM window: ff200000-ff2fffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:02.0
IO window: disabled.
MEM window: ff300000-ff3fffff
PREFETCH window: disabled.
PCI: Bridge: 0000:00:05.0
IO window: disabled.
MEM window: ff400000-ff4fffff
PREFETCH window: c7f00000-d7efffff
PCI: Bridge: 0000:00:06.0
IO window: d000-dfff
MEM window: ff500000-ff5fffff
PREFETCH window: 88000000-880fffff
ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 29 (level, low) -> IRQ 16
PCI: Setting latency timer of device 0000:00:01.0 to 64
ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 34 (level, low) -> IRQ 17
PCI: Setting latency timer of device 0000:00:02.0 to 64
PCI: Setting latency timer of device 0000:00:05.0 to 64
PCI: Setting latency timer of device 0000:00:06.0 to 64
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 65536 (order: 9, 2359296 bytes)
TCP bind hash table entries: 32768 (order: 8, 1179648 bytes)
TCP: Hash tables configured (established 65536 bind 32768)
TCP reno registered
Machine check exception polling timer started.
Initializing RT-Tester: OK
audit: initializing netlink socket (disabled)
audit(1164325505.879:1): initialized
highmem bounce pool size: 64 pages
io scheduler noop registered
io scheduler cfq registered (default)
vesafb: framebuffer at 0xc8000000, mapped to 0xf8880000, using 3072k, total 16384k
vesafb: mode is 1024x768x16, linelength=2048, pages=9
vesafb: protected mode interface info at c000:7880
vesafb: pmi: set display start = c00c79d3, set palette = c00c7ab3
vesafb: pmi: ports =
vesafb: scrolling: redraw
vesafb: Truecolor: size=0:5:6:5, shift=0:11:5:0
Console: switching to colour frame buffer device 128x48
fb0: VESA VGA frame buffer device
Real Time Clock Driver v1.12ac
Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
via-rhine.c:v1.10-LK1.4.2 Sept-11-2006 Written by Donald Becker
ACPI: PCI Interrupt 0000:04:07.0[A] -> GSI 22 (level, low) -> IRQ 18
eth0: VIA Rhine II at 0xff5fec00, 00:50:ba:f2:a3:1d, IRQ 18.
eth0: MII PHY found at address 8, status 0x7829 advertising 01e1 Link 45e1.
ACPI: PCI Interrupt 0000:04:06.0[A] -> GSI 21 (level, low) -> IRQ 19
scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 7.0
<Adaptec 29160N Ultra160 SCSI adapter>
aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs
scsi 0:0:4:0: CD-ROM PIONEER DVD-ROM DVD-305 1.03 PQ: 0 ANSI: 2
target0:0:4: Beginning Domain Validation
target0:0:4: FAST-20 SCSI 20.0 MB/s ST (50 ns, offset 16)
target0:0:4: Domain Validation skipping write tests
target0:0:4: Ending Domain Validation
scsi 0:0:5:0: CD-ROM PLEXTOR CD-R PX-W1210S 1.01 PQ: 0 ANSI: 2
target0:0:5: Beginning Domain Validation
target0:0:5: FAST-20 SCSI 20.0 MB/s ST (50 ns, offset 16)
target0:0:5: Domain Validation skipping write tests
target0:0:5: Ending Domain Validation
scsi 0:0:6:0: Direct-Access IBM DDYS-T36950N S96H PQ: 0 ANSI: 3
scsi0:A:6:0: Tagged Queuing enabled. Depth 200
target0:0:6: Beginning Domain Validation
target0:0:6: wide asynchronous
target0:0:6: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63)
target0:0:6: Ending Domain Validation
SCSI device sda: 71687340 512-byte hdwr sectors (36704 MB)
sda: Write Protect is off
sda: Mode Sense: cb 00 00 08
SCSI device sda: drive cache: write back
SCSI device sda: 71687340 512-byte hdwr sectors (36704 MB)
sda: Write Protect is off
sda: Mode Sense: cb 00 00 08
SCSI device sda: drive cache: write back
sda: sda1 sda2 sda3 sda4
sd 0:0:6:0: Attached scsi disk sda
sr0: scsi3-mmc drive: 16x/40x cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.20
sr 0:0:4:0: Attached scsi CD-ROM sr0
sr1: scsi3-mmc drive: 32x/32x writer cd/rw xa/form2 cdda tray
sr 0:0:5:0: Attached scsi CD-ROM sr1
sr 0:0:4:0: Attached scsi generic sg0 type 5
sr 0:0:5:0: Attached scsi generic sg1 type 5
sd 0:0:6:0: Attached scsi generic sg2 type 0
serio: i8042 KBD port at 0x60,0x64 irq 1
serio: i8042 AUX port at 0x60,0x64 irq 12
mice: PS/2 mouse device common for all mice
EDAC MC: Ver: 2.0.1 Nov 24 2006
TCP cubic registered
input: AT Translated Set 2 keyboard as /class/input/input0
Initializing XFRM netlink socket
NET: Registered protocol family 1
NET: Registered protocol family 17
Starting balanced_irq
Using IPI Shortcut mode
Time: acpi_pm clocksource has been installed.
input: ImExPS/2 Generic Explorer Mouse as /class/input/input1
kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
VFS: Mounted root (ext3 filesystem) readonly.
Freeing unused kernel memory: 224k freed
Write protecting the kernel read-only data: 384k
Adding 763076k swap on /dev/sda3. Priority:-1 extents:1 across:763076k
EXT3 FS on sda1, internal journal
ACPI: PCI Interrupt 0000:04:05.0[A] -> GSI 20 (level, low) -> IRQ 20
Linux agpgart interface v0.101 (c) Dave Jones
ReiserFS: sda2: found reiserfs format "3.6" with standard journal
ReiserFS: sda2: using ordered data mode
ReiserFS: sda2: journal params: device sda2, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
ReiserFS: sda2: checking transaction log (sda2)
ReiserFS: sda2: Using r5 hash to sort names
ReiserFS: sda4: found reiserfs format "3.6" with standard journal
ReiserFS: sda4: using ordered data mode
ReiserFS: sda4: journal params: device sda4, size 8192, journal first block 18, max trans len 1024, max batch 900, max commit age 30, max trans age 30
ReiserFS: sda4: checking transaction log (sda4)
ReiserFS: sda4: Using r5 hash to sort names
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
(scsi0:A:4:0): No or incomplete CDB sent to device.
scsi0: Issued Channel A Bus Reset. 7 SCBs aborted
target0:0:6: FAST-80 WIDE SCSI 160.0 MB/s DT (12.5 ns, offset 63)
target0:0:4: FAST-20 SCSI 20.0 MB/s ST (50 ns, offset 16)
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