On Wed, Apr 29, 2009 at 11:49:32AM -0400, Alan Stern wrote: > > > [10982.240510] [<c022f0b6>] ? try_to_del_timer_sync+0x15/0x4f > > > [10982.240516] [<c022f515>] ? del_timer_sync+0x5c/0x6c > > > [10982.240521] [<f86930c6>] ? ftdi_close+0xc5/0xe9 [ftdi_sio] > > > [10982.240540] [<f85c0a32>] ? serial_close+0x86/0x12d [usbserial] > > > [10982.240553] [<c03cb413>] ? tty_release_dev+0x176/0x3fa > > > [10982.240561] [<c023aefb>] ? lock_hrtimer_base+0x18/0x33 > > > [10982.240568] [<c0244ca4>] ? trace_hardirqs_off+0xb/0xd > > > [10982.240576] [<c051feed>] ? _spin_unlock_irqrestore+0x42/0x58 > > > [10982.240582] [<c028e4ff>] ? vfs_ioctl+0x22/0x69 > > > [10982.240589] [<c028e998>] ? do_vfs_ioctl+0x452/0x48b > > > [10982.240594] [<c03cb6a9>] ? tty_release+0x12/0x1c > > > [10982.240598] [<c02843ab>] ? __fput+0xca/0x175 > > > [10982.240604] [<c028446f>] ? fput+0x19/0x1b > > > [10982.240608] [<c0281b1d>] ? filp_close+0x51/0x5b > > > [10982.240612] [<c0281b91>] ? sys_close+0x6a/0xa4 > > > [10982.240616] [<c02029c8>] ? sysenter_do_call+0x12/0x36 > > > [10982.240623] Code: 40 f7 d0 83 e0 f2 5b c9 c3 55 31 c9 31 d2 64 a1 00 f0 73 c0 89 e5 e8 05 6f 00 00 c9 c3 55 89 e5 57 89 c7 56 53 83 ec 04 89 55 f0 <8b> 5f 14 89 de 83 e6 fe 74 22 89 f0 e8 8b 11 2f 00 8b 55 f0 89 > > > [10982.240675] EIP: [<c022eefd>] lock_timer_base+0xe/0x3e SS:ESP 0068:ea10fe44 > > > [10982.240681] CR2: 0000000000000090 > > > [10982.240685] ---[ end trace ca8d2f0f6a72aeeb ]--- > > > > usb-serial went splat. > > Looks like the ftdi_sio driver doesn't use proper reference counting > for its private data structure. Does this patch help? Nope, it doesn't. However, the backtrace is somewhat different now: [ 196.131549] BUG: unable to handle kernel NULL pointer dereference at 00000080 [ 196.131555] IP: [<c022f0fc>] del_timer+0xc/0x4e [ 196.131565] *pde = 00000000 [ 196.131569] Oops: 0000 [#1] PREEMPT SMP [ 196.131574] last sysfs file: /sys/devices/pci0000:00/0000:00:0f.0/0000:06:00.0/resource [ 196.131579] Modules linked in: nvidia(P) ppdev lp nfsd exportfs nfs lockd nfs_acl auth_rpcgss sunrpc dm_crypt dm_mod aes_generic cryptoloop loop snd_usb_caiaq snd_rawmidi snd_pcm pl2303 ftdi_sio usbserial snd_timer snd_page_alloc via_rhine mii psmouse i2c_nforce2 pcspkr forcedeth parport_pc thermal button [last unloaded: nvidia] [ 196.131622] [ 196.131627] Pid: 4103, comm: cu Tainted: P W (2.6.30-rc3 #1) MS-7260 [ 196.131631] EIP: 0060:[<c022f0fc>] EFLAGS: 00210282 CPU: 1 [ 196.131634] EIP is at del_timer+0xc/0x4e [ 196.131637] EAX: 00000080 EBX: 00000080 ECX: c051e362 EDX: 00000080 [ 196.131640] ESI: 00000000 EDI: 00000000 EBP: ef749e00 ESP: ef749df4 [ 196.131644] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 [ 196.131647] Process cu (pid: 4103, ti=ef748000 task=ef42ca70 task.ti=ef748000) [ 196.131650] Stack: [ 196.131652] 00000000 000004b2 00000064 ef749e74 c02355bc 00000080 00000000 00000068 [ 196.131662] 00200246 00000000 00000002 00000074 00000000 f8693ec8 f716582c 00000000 [ 196.131673] f8693ec8 f71657f8 ef749e60 00200246 00200046 00000001 f7165818 f71657f8 [ 196.131684] Call Trace: [ 196.131687] [<c02355bc>] ? __cancel_work_timer+0x2c/0x190 [ 196.131695] [<f8693ec8>] ? ftdi_close+0x43/0xe4 [ftdi_sio] [ 196.131712] [<f8693ec8>] ? ftdi_close+0x43/0xe4 [ftdi_sio] [ 196.131725] [<c0245b36>] ? trace_hardirqs_on+0xb/0xd [ 196.131730] [<c023572b>] ? cancel_delayed_work_sync+0xb/0xd [ 196.131736] [<f8693f4a>] ? ftdi_close+0xc5/0xe4 [ftdi_sio] [ 196.131748] [<f85c1a32>] ? serial_close+0x86/0x12d [usbserial] [ 196.131760] [<c03cb413>] ? tty_release_dev+0x176/0x3fa [ 196.131766] [<c023aefb>] ? lock_hrtimer_base+0x18/0x33 [ 196.131773] [<c0244ca4>] ? trace_hardirqs_off+0xb/0xd [ 196.131780] [<c051feed>] ? _spin_unlock_irqrestore+0x42/0x58 [ 196.131786] [<c028e4ff>] ? vfs_ioctl+0x22/0x69 [ 196.131792] [<c028e998>] ? do_vfs_ioctl+0x452/0x48b [ 196.131796] [<c03cb6a9>] ? tty_release+0x12/0x1c [ 196.131801] [<c02843ab>] ? __fput+0xca/0x175 [ 196.131807] [<c028446f>] ? fput+0x19/0x1b [ 196.131811] [<c0281b1d>] ? filp_close+0x51/0x5b [ 196.131816] [<c0281b91>] ? sys_close+0x6a/0xa4 [ 196.131820] [<c02029c8>] ? sysenter_do_call+0x12/0x36 [ 196.131826] Code: 10 c7 43 04 00 02 20 00 c7 03 00 00 00 00 8b 55 f4 89 c8 e8 c2 0d 2f 00 59 5b 89 f0 5e c9 c3 55 89 e5 56 31 f6 53 89 c3 83 ec 04 <83> 38 00 74 36 8d 55 f4 31 f6 e8 e4 fd ff ff 8b 13 89 c1 85 d2 [ 196.131881] EIP: [<c022f0fc>] del_timer+0xc/0x4e SS:ESP 0068:ef749df4 [ 196.131886] CR2: 0000000000000080 [ 196.131891] ---[ end trace e9230dfd36625f80 ]--- [ 196.264818] hub 1-3:1.0: debounce: port 4: total 100ms stable 100ms status 0x100 It's unreleated to the nvidia driver, btw. I tried it without, and the problem persists. Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
