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Date: Mon, 02 Oct 2006 23:47:06 +0200
From: Arkadiusz Jałowiec <ajalowiec@...eria.pl>
To: Paolo Ornati <ornati@...twebnet.it>, linux-kernel@...r.kernel.org,
linux-usb-users@...ts.sourceforge.net, stern@...land.harvard.edu
Subject: Re: [Linux-usb-users] PROBLEM: Kernel 2.6.x freeze
Paolo Ornati wrote:
> Another crazy theory (based on my horrible experience with a
> defective memory module):
>
I don't know, but I think this theory is possibly :(
> There is an hard to trigger single bit error not detected by memtest
> near (physical) memory address 6b79f00(ESP) (where the EIP has been
> retrived causing the Oops).
>
> In this case the physical address (at Kb 110055) can be skipped with
> "memmap=1K$110055K" kernel boot option.
>
I add to kernel command line this option and I boot my computer. dmesg
show me this:
Linux version 2.6.18 (root@...kstar) (gcc version 3.3.6) #1 Wed Sep 27
08:19:45 UTC 2006
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 000000000fff0000 (usable)
BIOS-e820: 000000000fff0000 - 000000000fff3000 (ACPI NVS)
BIOS-e820: 000000000fff3000 - 0000000010000000 (ACPI data)
BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved)
255MB LOWMEM available.
On node 0 totalpages: 65520
DMA zone: 4096 pages, LIFO batch:0
Normal zone: 61424 pages, LIFO batch:15
DMI 2.3 present.
ACPI: RSDP (v000 VIAP4X ) @ 0x000f62d0
ACPI: RSDT (v001 VIAP4X AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x0fff3000
ACPI: FADT (v001 VIAP4X AWRDACPI 0x42302e31 AWRD 0x00000000) @ 0x0fff3040
ACPI: DSDT (v001 VIAP4X AWRDACPI 0x00001000 MSFT 0x0100000d) @ 0x00000000
ACPI: PM-Timer IO Port: 0x408
Allocating PCI resources starting at 10000000 (gap: 06b7a000:f9486000)
Detected 2200.142 MHz processor.
Built 1 zonelists. Total pages: 65520
Kernel command line: root=/dev/hda5 vga=791 memmap=1K$110055K
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
PID hash table entries: 1024 (order: 10, 4096 bytes)
Console: colour dummy device 80x25
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 256220k/262080k available (1923k kernel code, 5364k reserved,
806k data, 156k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 4403.02 BogoMIPS
(lpj=2201512)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebf9ff 00000000 00000000 00000000
00000000 00000000 00000000
CPU: After vendor identify, caps: bfebf9ff 00000000 00000000 00000000
00000000 00000000 00000000
CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 128K
CPU: After all inits, caps: bfebf9ff 00000000 00000000 00000080 00000000
00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
Compat vDSO mapped to ffffe000.
CPU: Intel(R) Celeron(R) CPU 2.20GHz stepping 07
Checking 'hlt' instruction... OK.
ACPI: Core revision 20060707
ACPI: setting ELCR to 0200 (from 0a28)
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: PCI BIOS revision 2.10 entry at 0xfb290, last bus=1
PCI: Using configuration type 1
Setting up standard PCI resources
ACPI: Interpreter enabled
ACPI: Using PIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Probing PCI hardware (bus 00)
PCI quirk: region 0400-047f claimed by vt8235 PM
PCI quirk: region 0500-050f claimed by vt8235 SMB
Boot video device is 0000:01:00.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 1 3 4 5 6 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 1 *3 4 5 6 7 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 1 3 4 *5 6 7 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 1 3 4 5 6 7 10 *11 12 14 15)
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI init
pnp: PnP ACPI: found 14 devices
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: e4000000-e5ffffff
PREFETCH window: d0000000-dfffffff
PCI: Setting latency timer of device 0000:00:01.0 to 64
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 3, 32768 bytes)
TCP bind hash table entries: 4096 (order: 2, 16384 bytes)
TCP: Hash tables configured (established 8192 bind 4096)
TCP reno registered
Machine check exception polling timer started.
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
fuse init (API version 7.7)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
vesafb: framebuffer at 0xd0000000, mapped to 0xd0880000, using 3072k,
total 65536k
vesafb: mode is 1024x768x16, linelength=2048, pages=1
vesafb: protected mode interface info at c000:e700
vesafb: pmi: set display start = c00ce745, set palette = c00ce7ca
vesafb: pmi: ports = b4c3 b503 ba03 c003 c103 c403 c503 c603 c703 c803
c903 cc03 ce03 cf03 d003 d103 d203 d303 d403 d503 da03 ff03
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
ACPI: Power Button (FF) [PWRF]
ACPI: Power Button (CM) [PWRB]
ACPI: Sleep Button (CM) [SLPB]
ACPI: CPU0 (power states: C1[C1] C2[C2])
ACPI: Processor [CPU0] (supports 2 throttling states)
ACPI: Thermal Zone [THRM] (46 C)
ipmi message handler version 39.0
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
RAMDISK driver initialized: 16 RAM disks of 7777K size 1024 blocksize
loop: loaded (max 8 devices)
PPP generic driver version 2.4.2
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller at PCI slot 0000:00:11.1
ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 11
PCI: setting IRQ 11 as level-triggered
ACPI: PCI Interrupt 0000:00:11.1[A] -> Link [LNKA] -> GSI 11 (level,
low) -> IRQ 11
PCI: VIA IRQ fixup for 0000:00:11.1, from 255 to 11
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci0000:00:11.1
ide0: BM-DMA at 0xe000-0xe007, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xe008-0xe00f, BIOS settings: hdc:DMA, hdd:DMA
Probing IDE interface ide0...
hda: SAMSUNG SV4012H, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
hdc: JLMS XJ-HD165H, ATAPI CD/DVD-ROM drive
hdd: LITE-ON LTR-48246S, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
hda: max request size: 128KiB
hda: 78242976 sectors (40060 MB) w/2048KiB Cache, CHS=65535/16/63, UDMA(33)
hda: cache flushes supported
hda: hda1 hda2 hda3 hda4 < hda5 hda6 >
hdc: ATAPI 48X DVD-ROM drive, 512kB Cache, UDMA(33)
Uniform CD-ROM driver Revision: 3.20
hdd: ATAPI 48X CD-ROM CD-R/RW drive, 2048kB Cache, UDMA(33)
ide-floppy driver 0.99.newide
PNP: PS/2 Controller [PNP0303:PS2K,PNP0f13:PS2M] at 0x60,0x64 irq 1,12
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
mice: PS/2 mouse device common for all mice
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
NET: Registered protocol family 8
NET: Registered protocol family 20
Using IPI Shortcut mode
Time: tsc clocksource has been installed.
ACPI: (supports S0 S3 S4<6>Time: acpi_pm clocksource has been installed.
S5)
input: AT Translated Set 2 keyboard as /class/input/input0
ReiserFS: hda5: found reiserfs format "3.6" with standard journal
input: ImPS/2 Generic Wheel Mouse as /class/input/input1
ReiserFS: hda5: using ordered data mode
ReiserFS: hda5: journal params: device hda5, size 8192, journal first
block 18, max trans len 1024, max batch 900, max commit age 30, max
trans age 30
ReiserFS: hda5: checking transaction log (hda5)
ReiserFS: hda5: replayed 14 transactions in 0 seconds
ReiserFS: hda5: Using r5 hash to sort names
VFS: Mounted root (reiserfs filesystem) readonly.
Freeing unused kernel memory: 156k freed
Adding 265032k swap on /dev/hda6. Priority:-1 extents:1 across:265032k
ip_tables: (C) 2000-2006 Netfilter Core Team
ip_conntrack version 2.4 (2047 buckets, 16376 max) - 224 bytes per conntrack
via-rhine.c:v1.10-LK1.4.1 July-24-2006 Written by Donald Becker
ACPI: PCI Interrupt 0000:00:12.0[A] -> Link [LNKA] -> GSI 11 (level,
low) -> IRQ 11
eth0: VIA Rhine II at 0x1ec00, 00:e0:4c:8e:49:95, IRQ 11.
eth0: MII PHY found at address 1, status 0x7849 advertising 05e1 Link 0000.
ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 5
PCI: setting IRQ 5 as level-triggered
ACPI: PCI Interrupt 0000:00:11.5[C] -> Link [LNKC] -> GSI 5 (level, low)
-> IRQ 5
PCI: Setting latency timer of device 0000:00:11.5 to 64
usbcore: registered new driver usbfs
usbcore: registered new driver hub
ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
ACPI: PCI Interrupt 0000:00:10.3[D] -> Link [LNKD] -> GSI 11 (level,
low) -> IRQ 11
ehci_hcd 0000:00:10.3: EHCI Host Controller
ehci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 1
ehci_hcd 0000:00:10.3: irq 11, io mem 0xe6010000
ehci_hcd 0000:00:10.3: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 6 ports detected
USB Universal Host Controller Interface driver v3.0
ACPI: PCI Interrupt 0000:00:10.0[A] -> Link [LNKA] -> GSI 11 (level,
low) -> IRQ 11
uhci_hcd 0000:00:10.0: UHCI Host Controller
uhci_hcd 0000:00:10.0: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:10.0: irq 11, io base 0x0000d400
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 3
PCI: setting IRQ 3 as level-triggered
ACPI: PCI Interrupt 0000:00:10.1[B] -> Link [LNKB] -> GSI 3 (level, low)
-> IRQ 3
uhci_hcd 0000:00:10.1: UHCI Host Controller
uhci_hcd 0000:00:10.1: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:10.1: irq 3, io base 0x0000d800
usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
usb 2-1: new full speed USB device using uhci_hcd and address 2
usb 2-1: configuration #1 chosen from 1 choice
ACPI: PCI Interrupt 0000:00:10.2[C] -> Link [LNKC] -> GSI 5 (level, low)
-> IRQ 5
uhci_hcd 0000:00:10.2: UHCI Host Controller
uhci_hcd 0000:00:10.2: new USB bus registered, assigned bus number 4
uhci_hcd 0000:00:10.2: irq 5, io base 0x0000dc00
usb usb4: configuration #1 chosen from 1 choice
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
[ueagle-atm] driver ueagle 1.3 loaded
usb 2-1: [ueagle-atm] ADSL device founded vid (0X1110) pid (0X9021) :
Eagle II
usb 2-1: reset full speed USB device using uhci_hcd and address 2
Linux agpgart interface v0.101 (c) Dave Jones
agpgart: Detected VIA P4M266x/P4N266 chipset
agpgart: AGP aperture is 64M @ 0xe0000000
usb 2-1: [ueagle-atm] using iso mode
usbcore: registered new driver ueagle-atm
usb 2-1: [ueagle-atm] (re)booting started
parport: PnPBIOS parport detected.
parport0: PC-style at 0x378, irq 7 [PCSPP(,...)]
usb 2-1: [ueagle-atm] modem operational
usb 2-1: [ueagle-atm] ATU-R firmware version : 44e2ea17
I was waiting about one hour and I have another oops. I copy oops
handy. [ I don't have a digital camera and I don't know person who wont
to me lend. Sorry !!!]
BUG: unable to handle kernel paging request at virtual address 000f9edf
printing epip
*pde=00000000
Ops: 0002 [#1]
Modules linked in: ppp_deflate zlib_deflate bsd_comp pppoatm ipv6
partport_pc partport snd_pcm_oss snd_mixer_oss via_agp agpgart uagle_atm
usbatm uhci_hcd ehci_hcd usbcore i2c_viapro i2c_core snd_via82xx
snd_ac97.codec snd_ac97_bus snd_pcm snd_timer snd_page_alloc
snd_mpu_401_uart snd_rawmidi ipt_LOG snd_seq_device snd xt_limit
soundcore via_rhine mii xt_tcpudp xt_state iptables_filter nls_iso8859-2
nls_cp852 ip_contract_irc ip_contract_ftp xt_contract ip_contract
iptables x_tables
CPU: 0
EIP: 0060: [<d0d18140>] Not tainted VLI
EFLAGS: 00010083 (2.6.18 #1)
EIP is at uhci_result_isochronous+0x4f/0x131 [uhci_hcd]
eax: 000f9edf ebx: cf7b3600 edx:000f9edf edx:ceedfed0
esi:cf7b3600 edi:cba5c2a0 epb:ceedfed0 esp:c03adef8
ds:007b es:007b ss:0068
Process swapper (pid:0,ti=c03ac000 task=c03530a0 task.ti=c03ac000)
Stack: cf15e3a0 cba5c330 ce2caac0 ceedfed0 cf7b3600 ce2caac0 00000001
ceedfed0
d0d185d1 c03adfa4 ceedfed0 cf7b3600 00000001 c03adfa4 d0d1884b 00000246
00000000 00000000 ceedfe00 d0d192ad ceedfed0 c03adfa4 ceedfe00 00000000
Call Trace:
[<d0d185d1>] uhci_scan_qh+0x28/0x174 [uhci_hcd]
[<d0d18846>] uhci_scan_schedule+0x72/0xec [uhci_hcd]
[<d0d192ad>] uhci_hcd_irq+0x27/0x4e [usbcore]
[<c012c4c4>] handle_IRQ_event+0x21/0x47
[<c012c545>]_do_IRQ+0x5b/0xa2
[<c0104106>] do_IRQ+0x40/04d
[<c0102c4a>] common_interrupt+0x1a/0x20
[<c021dfd1>] acpi_processor_idle+0x1c4/0x2c3
[<c01010c4>] cpu_idle+0x3f/0x5b
[<c03ae63b>] start_kernel+0x197/0x199
Code 83 ed 14 39 c2 89 6c 24 04 0f 84 f3 00 00 00 8b 46 3c 8b 54 24 0c
3b 42 70 78 0a b8 8d ff ff ff e9 e0 00 00 00 89 c1 8b 6c 24 0c <00> 20
7b 0f 00 00 00 00 69 7f e0 ff 00 00 00 00 00 20 7b 0f 14
EIP:[<cd0d18140>] uhci_result_isochronous+0x4f/0x131
[uhci_hcd] SS:ESP 0068:c03adef8
<0> Kernel panic - not syncing: Fatal excepition in interrupt
I run "objdump -d drivers/usb/host/uhci-hcd.o" and post the portion of
the output for: uhci_result_isochronous
000010f1 <uhci_result_isochronous>:
10f1: 55 push %ebp
10f2: 57 push %edi
10f3: 56 push %esi
10f4: 53 push %ebx
10f5: 83 ec 10 sub $0x10,%esp
10f8: 89 44 24 0c mov %eax,0xc(%esp)
10fc: 89 54 24 08 mov %edx,0x8(%esp)
1100: 8b 42 04 mov 0x4(%edx),%eax
1103: 89 04 24 mov %eax,(%esp)
1106: 8b 50 10 mov 0x10(%eax),%edx
1109: 8b 70 0c mov 0xc(%eax),%esi
110c: 83 c0 10 add $0x10,%eax
110f: 8d 7a ec lea 0xffffffec(%edx),%edi
1112: 8b 6f 14 mov 0x14(%edi),%ebp
1115: 83 ed 14 sub $0x14,%ebp
1118: 39 c2 cmp %eax,%edx
111a: 89 6c 24 04 mov %ebp,0x4(%esp)
111e: 0f 84 f3 00 00 00 je 1217
<uhci_result_isochronous+0x126>
1124: 8b 46 3c mov 0x3c(%esi),%eax
1127: 8b 54 24 0c mov 0xc(%esp),%edx
112b: 3b 42 70 cmp 0x70(%edx),%eax
112e: 78 0a js 113a
<uhci_result_isochronous+0x49>
1130: b8 8d ff ff ff mov $0xffffff8d,%eax
1135: e9 e0 00 00 00 jmp 121a
<uhci_result_isochronous+0x129>
113a: 89 c1 mov %eax,%ecx
113c: 8b 6c 24 0c mov 0xc(%esp),%ebp
1140: 81 e1 ff 03 00 00 and $0x3ff,%ecx
1146: 8b 45 58 mov 0x58(%ebp),%eax
1149: 8b 1c 88 mov (%eax,%ecx,4),%ebx
114c: 85 db test %ebx,%ebx
114e: 74 35 je 1185
<uhci_result_isochronous+0x94>
1150: 8b 43 24 mov 0x24(%ebx),%eax
1153: 8b 55 54 mov 0x54(%ebp),%edx
1156: 8b 40 e0 mov 0xffffffe0(%eax),%eax
1159: 89 04 8a mov %eax,(%edx,%ecx,4)
115c: 8b 45 58 mov 0x58(%ebp),%eax
115f: 8d 6b 20 lea 0x20(%ebx),%ebp
1162: c7 04 88 00 00 00 00 movl $0x0,(%eax,%ecx,4)
1169: 39 6b 20 cmp %ebp,0x20(%ebx)
116c: 74 17 je 1185
<uhci_result_isochronous+0x94>
116e: 8b 43 24 mov 0x24(%ebx),%eax
1171: 8b 48 04 mov 0x4(%eax),%ecx
1174: 8b 10 mov (%eax),%edx
1176: 89 11 mov %edx,(%ecx)
1178: 89 4a 04 mov %ecx,0x4(%edx)
117b: 89 00 mov %eax,(%eax)
117d: 39 6b 20 cmp %ebp,0x20(%ebx)
1180: 89 40 04 mov %eax,0x4(%eax)
1183: 75 e9 jne 116e
<uhci_result_isochronous+0x7d>
1185: 8b 5f 04 mov 0x4(%edi),%ebx
1188: f7 c3 00 00 80 00 test $0x800000,%ebx
118e: b9 ee ff ff ff mov $0xffffffee,%ecx
1193: 75 3d jne 11d2
<uhci_result_isochronous+0xe1>
1195: 8b 44 24 08 mov 0x8(%esp),%eax
1199: 8b 50 20 mov 0x20(%eax),%edx
119c: 89 d8 mov %ebx,%eax
119e: c1 ea 07 shr $0x7,%edx
11a1: 25 00 00 f6 00 and $0xf60000,%eax
11a6: 83 f2 01 xor $0x1,%edx
11a9: 83 e2 01 and $0x1,%edx
11ac: e8 fc f5 ff ff call 7ad <uhci_map_status>
11b1: 89 c1 mov %eax,%ecx
11b3: 8b 54 24 08 mov 0x8(%esp),%edx
11b7: 8d 43 01 lea 0x1(%ebx),%eax
11ba: 25 ff 07 00 00 and $0x7ff,%eax
11bf: 01 42 38 add %eax,0x38(%edx)
11c2: 85 c9 test %ecx,%ecx
11c4: 8b 56 2c mov 0x2c(%esi),%edx
11c7: 89 42 08 mov %eax,0x8(%edx)
11ca: 8b 46 2c mov 0x2c(%esi),%eax
11cd: 89 48 0c mov %ecx,0xc(%eax)
11d0: 74 0a je 11dc
<uhci_result_isochronous+0xeb>
11d2: 8b 6c 24 08 mov 0x8(%esp),%ebp
11d6: ff 45 50 incl 0x50(%ebp)
11d9: 89 4e 40 mov %ecx,0x40(%esi)
11dc: 89 f8 mov %edi,%eax
11de: e8 71 ef ff ff call 154 <uhci_remove_td_from_urbp>
11e3: 89 fa mov %edi,%edx
11e5: 8b 44 24 0c mov 0xc(%esp),%eax
11e9: e8 e6 ee ff ff call d4 <uhci_free_td>
11ee: 83 46 2c 10 addl $0x10,0x2c(%esi)
11f2: 8b 46 38 mov 0x38(%esi),%eax
11f5: 01 46 3c add %eax,0x3c(%esi)
11f8: 8b 7c 24 04 mov 0x4(%esp),%edi
11fc: 8b 47 14 mov 0x14(%edi),%eax
11ff: 8d 57 14 lea 0x14(%edi),%edx
1202: 83 e8 14 sub $0x14,%eax
1205: 89 44 24 04 mov %eax,0x4(%esp)
1209: 8b 04 24 mov (%esp),%eax
120c: 83 c0 10 add $0x10,%eax
120f: 39 c2 cmp %eax,%edx
1211: 0f 85 0d ff ff ff jne 1124
<uhci_result_isochronous+0x33>
1217: 8b 46 40 mov 0x40(%esi),%eax
121a: 83 c4 10 add $0x10,%esp
121d: 5b pop %ebx
121e: 5e pop %esi
121f: 5f pop %edi
1220: 5d pop %ebp
1221: c3 ret
----------------------------------------------------------------------
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