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From: Petr Vandrovec on 6 Mar 2010 01:50
Jeff Chua wrote:
>
>
> On Sat, Mar 6, 2010 at 11:45 AM, Petr Vandrovec <petr(a)vmware.com
> <mailto:petr(a)vmware.com>> wrote:
>
> does your box hang, or is it just vmware process that is hung?
>
>
> Just the "vmware" process that hangs only. It just got stuck, and even
> kill -9 doesn't free it.
>
>
> I've noticed that my box here at work has this change too, and I do
> not see any hang - neither in kernel, or in GUI startup, nor in test
> sample:
>
> open("/proc/bus/usb/devices", O_RDWR) = 3
> poll([{fd=3, events=POLLIN}], 1, 5000) = 1 ([{fd=3, revents=POLLIN}])
> poll([{fd=3, events=POLLIN}], 1, 5000) = 0 (Timeout)
> exit_group(0) = ?
> petr-dev3:/tmp# uname -a
> Linux petr-dev3 2.6.33-64-05079-g6517b45-dirty #51 SMP PREEMPT Thu
> Mar 4 20:29:55 PST 2010 x86_64 GNU/Linux
>
>
> Here's mine ...
> open("/proc/bus/usb/devices", O_RDONLY) = 65
> fcntl(65, F_GETFL) = 0x8000 (flags
> O_RDONLY|O_LARGEFILE)
> fstat(65, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)
> = 0x7f85396c8000
> lseek(65, 0, SEEK_CUR) = 0
> read(65,
>
>
> Again in my previous email, on my box, "cat /proc/bus/usb/devices"
> hangs as well. You sure you've commit
> 554f76962d3a6eb5110415f1591aca83f96a84ae
> on yours?

Well, I hope. Disassembly of usbcore says that I have
mutex_lock(&usbfs_mutex) in usbfs_conn_disc_event, so that checkin
should be in my tree:

000000000001cc10 <usbfs_conn_disc_event>:
1cc10: 55 push %rbp
1cc11: 48 89 e5 mov %rsp,%rbp
1cc14: e8 00 00 00 00 callq 1cc19
<usbfs_conn_disc_event+0x9>
1cc15: R_X86_64_PC32 mcount+0xfffffffffffffffc
1cc19: 31 f6 xor %esi,%esi
1cc1b: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
1cc1e: R_X86_64_32S usbfs_mutex
1cc22: e8 00 00 00 00 callq 1cc27
<usbfs_conn_disc_event+0x17>
1cc23: R_X86_64_PC32
mutex_lock_nested+0xfffffffffffffffc
1cc27: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
1cc2a: R_X86_64_32S usbfs_mutex
1cc2e: ff 05 00 00 00 00 incl 0x0(%rip) # 1cc34
<usbfs_conn_disc_event+0x24>
1cc30: R_X86_64_PC32 .bss+0x9a4
1cc34: e8 00 00 00 00 callq 1cc39
<usbfs_conn_disc_event+0x29>
1cc35: R_X86_64_PC32
mutex_unlock+0xfffffffffffffffc
1cc39: 31 c9 xor %ecx,%ecx
1cc3b: ba 01 00 00 00 mov $0x1,%edx
1cc40: be 03 00 00 00 mov $0x3,%esi
1cc45: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
1cc48: R_X86_64_32S .data+0x1d00
1cc4c: e8 00 00 00 00 callq 1cc51
<usbfs_conn_disc_event+0x41>
1cc4d: R_X86_64_PC32
__wake_up+0xfffffffffffffffc
1cc51: c9 leaveq
1cc52: c3 retq


One thing is that I brought my only USB device home, so currently I have
none attached to the box:

petr-dev3:/usr/src/git/linux-2.6# cat /proc/bus/usb/devices

T: Bus=02 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 3
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0001 Rev= 2.06
S: Manufacturer=Linux 2.6.33-64-05079-g6517b45-dirty ohci_hcd
S: Product=OHCI Host Controller
S: SerialNumber=0000:03:00.1
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms

T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 3
B: Alloc= 0/900 us ( 0%), #Int= 0, #Iso= 0
D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1d6b ProdID=0001 Rev= 2.06
S: Manufacturer=Linux 2.6.33-64-05079-g6517b45-dirty ohci_hcd
S: Product=OHCI Host Controller
S: SerialNumber=0000:03:00.0
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
petr-dev3:/usr/src/git/linux-2.6#

I'll try upgrading my box at home. Maybe that one will hang.
Petr
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