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Date: Fri, 05 Mar 2010 22:46:26 -0800 From: Petr Vandrovec <petr@...are.com> To: Jeff Chua <jeff.chua.linux@...il.com> CC: Jeff Chua <jeff.tw.chua@...il.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Linux Kernel <linux-kernel@...r.kernel.org>, Oliver Neukum <oliver@...kum.org>, Greg Kroah-Hartman <gregkh@...e.de>, Frederic Weisbecker <fweisbec@...il.com> Subject: Re: commit 554f76962d3a6eb5110415f1591aca83f96a84ae hangs USB for vmware 7.0.1 Jeff Chua wrote: > > > On Sat, Mar 6, 2010 at 11:45 AM, Petr Vandrovec <petr@...are.com > <mailto:petr@...are.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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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