On Fri, 4 Sep 2009, Alan Stern wrote: > On Fri, 4 Sep 2009, Alan Cox wrote: > > > On Fri, 4 Sep 2009 10:17:30 -0400 (EDT) > > Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > > > > > On Fri, 4 Sep 2009, Miklos Szeredi wrote: > > > > > > > On Thu, 3 Sep 2009, Greg KH wrote: > > > > > On Thu, Sep 03, 2009 at 04:13:34PM +0200, Miklos Szeredi wrote: > > > > > > I get the following warnings in 2.6.31-rc. A lot of them: > > > > > > > > > > > > WARNING: at drivers/usb/serial/usb-serial.c:414 > > > > > > serial_write_room+0x59/0x6e [usbserial]() WARNING: at > > > > > > drivers/usb/serial/usb-serial.c:401 serial_write+0x77/0x9d > > > > > > [usbserial]() > > > > > > > > > > > > This is a huawei-3565 modem. > > > > > > > > > > > > The messages don't seem to hurt, but there's lot of trouble > > > > > > with this gadget. Sometimes it just doesn't work after a while > > > > > > and a reboot is needed. Sometimes it hangs the kernel after > > > > > > suspend, etc. Not sure if this is related to the warnings... > > > > > > > > > > {sigh} > > > > > > > > > > The tty layer changes are being a pain here :( > > > > > > > > > > Alan Stern posted a set of patches to the linux-usb list to > > > > > hopefully address stuff like this, is there any way you could > > > > > test them out to see if they help or not? > > > > > > > > Nope, it doesn't seem to help. Still got the same warnings with the > > > > patched kernel (latest git + ghk tree + usbserial patches). Here's a reproducible Oops on that kernel when trying to connect with wvdial. This is a regression compared to -linus, where wvdial works (most of the time anyway). I can bisect it if it's not immediately obvious what is happening... Thanks, Miklos --- BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: [<ffffffffa020709c>] serial_chars_in_buffer+0x47/0x5f [usbserial] PGD 0 Oops: 0000 [#1] PREEMPT SMP last sysfs file: /sys/class/rfkill/rfkill2/state CPU 0 Modules linked in: ppp_generic slhc option usbserial nls_iso8859_1 nls_cp437 vfat fat usb_storage bnep rfcomm sco l2cap acpi_cpufreq nf_conntrack_netbios_ns microcode fuse iwl3945 iwlcore thinkpad_acpi mac80211 backlight btusb led_class bluetooth thermal ac battery processor button nsc_ircc irda crc_ccitt cfg80211 rfkill e1000e uinput [last unloaded: usbserial] Pid: 5159, comm: pppd Tainted: G W 2.6.31-rc8-gkh-00038-g37d0892-dirty #33 2007FUG RIP: 0010:[<ffffffffa020709c>] [<ffffffffa020709c>] serial_chars_in_buffer+0x47/0x5f [usbserial] RSP: 0018:ffff8800ac753d78 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff8800bf3d8800 RCX: 000000000000001a RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88001912a000 RBP: ffff8800ac753d88 R08: 00007f8611e2d1f0 R09: ffff8800ac753f28 R10: 3d4449505f445050 R11: 0000000000000246 R12: ffff88001912a000 R13: ffff88001912a000 R14: ffff88001912a000 R15: ffff88001912a000 FS: 00007f86105b96f0(0000) GS:ffff880001f3d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000018 CR3: 000000008d7db000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process pppd (pid: 5159, threadinfo ffff8800ac752000, task ffff88001914e040) Stack: ffff8800ac675c00 7fffffffffffffff ffff8800ac753d98 ffffffff811c271e <0> ffff8800ac753e08 ffffffff811c2c73 ffff8800ac753df8 0000000000000046 <0> ffff88001914e040 ffffffff810c676a ffff8800ac675ac0 ffff8800bf840bc0 Call Trace: [<ffffffff811c271e>] tty_chars_in_buffer+0x1a/0x1c [<ffffffff811c2c73>] tty_wait_until_sent+0x32/0xfc [<ffffffff810c676a>] ? kmem_cache_free+0x118/0x18b [<ffffffff811be720>] tty_ioctl+0xa6/0x891 [<ffffffff810d826e>] vfs_ioctl+0x2f/0x7d [<ffffffff810d87eb>] do_vfs_ioctl+0x4af/0x4ec [<ffffffff810cc1ae>] ? fget+0x0/0x127 [<ffffffff8100b1cc>] ? sysret_check+0x27/0x62 [<ffffffff810d886f>] sys_ioctl+0x47/0x6a [<ffffffff8100b19b>] system_call_fastpath+0x16/0x1b Code: 00 74 23 0f b6 8b 50 02 00 00 48 c7 c2 20 ac 20 a0 48 c7 c6 67 b0 20 a0 48 c7 c7 87 b0 20 a0 31 c0 e8 13 53 11 e1 48 8b 13 31 c0 <f6> 42 18 01 75 0d 48 8b 42 08 4c 89 e7 ff 90 58 01 00 00 5b 41 RIP [<ffffffffa020709c>] serial_chars_in_buffer+0x47/0x5f [usbserial] RSP <ffff8800ac753d78> CR2: 0000000000000018 ---[ end trace 644f4c2ff2fe598a ]--- -- 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