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Message-ID: <4A6ACD80.5090307@googlemail.com> Date: Sat, 25 Jul 2009 11:16:48 +0200 From: e9hack <e9hack@...glemail.com> To: linux-kernel@...r.kernel.org Subject: [BUG] Linux-2.6.31-rc4 fails to open a USB serial port Hi, if I open a USB serial port (FT232RL from FTDI), I got a mutex problem. It occurs immediately during the open call. The USB converter is always plugged in. With 2.6.31-rc3, I don't see this problem. Regards, Hartmut Jul 25 10:26:43 vdr kernel: [ 24.931403] WARNING: at /usr/src/linux-2.6.31-rc4/kernel/mutex-debug.c:77 debug_mutex_unlock+0x8c/0xd2() Jul 25 10:26:43 vdr kernel: [ 24.932025] Hardware name: MS-7207PV Jul 25 10:26:43 vdr kernel: [ 24.932025] Modules linked in: aes_x86_64 aes_generic af_packet cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave powernow_k8 freq_table ipt_REJECT xt_state iptable_mangle iptable_nat nf_nat iptable_filter nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables fuse nls_iso8859_1 nls_cp437 vfat fat loop dm_mod tda10021 stv0297 arc4 ecb budget_av dvb_ttpci saa7146_vv zd1211rw videodev v4l1_compat firmware_class budget_core v4l2_compat_ioctl32 parport_pc dvb_core mac80211 videobuf_dma_sg ppdev ftdi_sio saa7146 videobuf_core usb_storage rtc_cmos parport cfg80211 rtc_core ttpci_eeprom button usbserial usb_libusual k8temp rtc_lib sr_mod rfkill forcedeth i2c_nforce2 cdrom evdev sg ehci_hcd ohci_hcd sd_mod crc_t10dif usbcore edd ext3 mbcache jbd fan pata_amd sata_nv libata scsi_mod thermal processor thermal_sys hwmon Jul 25 10:26:43 vdr kernel: [ 24.932025] Pid: 3270, comm: vdr Not tainted 2.6.31-rc4-64-mp-suse-11 #1 Jul 25 10:26:43 vdr kernel: [ 24.932025] Call Trace: Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff81066bbc>] ? debug_mutex_unlock+0x8c/0xd2 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff8104475e>] warn_slowpath_common+0x77/0xa4 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff8104479a>] warn_slowpath_null+0xf/0x11 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff81066bbc>] debug_mutex_unlock+0x8c/0xd2 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff812aa3c3>] __mutex_unlock_slowpath+0xad/0x100 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff812aa41f>] mutex_unlock+0x9/0xb Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffffa01b0552>] serial_open+0x1f8/0x256 [usbserial] Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff811dbfe1>] tty_open+0x301/0x424 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810d9c55>] chrdev_open+0x18d/0x1ae Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810d9ac8>] ? chrdev_open+0x0/0x1ae Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810d552f>] __dentry_open+0x18f/0x2b4 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810d5721>] nameidata_to_filp+0x41/0x52 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810e2dde>] do_filp_open+0x533/0xa3a Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff81223099>] ? sys_sendto+0xf1/0x107 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff812abc5e>] ? _spin_unlock+0x13/0x2c Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810ebc02>] ? alloc_fd+0x11d/0x12e Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810d52bc>] do_sys_open+0x5d/0x104 Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff810d538c>] sys_open+0x1b/0x1d Jul 25 10:26:43 vdr kernel: [ 24.932025] [<ffffffff8100baab>] system_call_fastpath+0x16/0x1b Jul 25 10:26:43 vdr kernel: [ 24.932025] ---[ end trace f090009acc376d07 ]--- Jul 25 10:26:43 vdr kernel: [ 24.946809] general protection fault: 0000 [#1] PREEMPT SMP Jul 25 10:26:43 vdr kernel: [ 24.947012] last sysfs file: /sys/class/firmware/2-5/loading Jul 25 10:26:43 vdr kernel: [ 24.947012] CPU 0 Jul 25 10:26:43 vdr kernel: [ 24.947012] Modules linked in: aes_x86_64 aes_generic af_packet cpufreq_conservative cpufreq_ondemand cpufreq_userspace cpufreq_powersave powernow_k8 freq_table ipt_REJECT xt_state iptable_mangle iptable_nat nf_nat iptable_filter nf_conntrack_netbios_ns nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4 ip_tables x_tables fuse nls_iso8859_1 nls_cp437 vfat fat loop dm_mod tda10021 stv0297 arc4 ecb budget_av dvb_ttpci saa7146_vv zd1211rw videodev v4l1_compat firmware_class budget_core v4l2_compat_ioctl32 parport_pc dvb_core mac80211 videobuf_dma_sg ppdev ftdi_sio saa7146 videobuf_core usb_storage rtc_cmos parport cfg80211 rtc_core ttpci_eeprom button usbserial usb_libusual k8temp rtc_lib sr_mod rfkill forcedeth i2c_nforce2 cdrom evdev sg ehci_hcd ohci_hcd sd_mod crc_t10dif usbcore edd ext3 mbcache jbd fan pata_amd sata_nv libata scsi_mod thermal processor thermal_sys hwmon Jul 25 10:26:43 vdr kernel: [ 24.947012] Pid: 3270, comm: vdr Tainted: G W 2.6.31-rc4-64-mp-suse-11 #1 MS-7207PV Jul 25 10:26:43 vdr kernel: [ 24.947012] RIP: 0010:[<ffffffff811dbed9>] [<ffffffff811dbed9>] tty_open+0x1f9/0x424 Jul 25 10:26:43 vdr kernel: [ 24.947012] RSP: 0018:ffff880039dd3ce8 EFLAGS: 00010206 Jul 25 10:26:43 vdr kernel: [ 24.947012] RAX: ffff88003746d580 RBX: ffff880039817000 RCX: ffff8800392a5708 Jul 25 10:26:43 vdr kernel: [ 24.947012] RDX: 3a36323a30312035 RSI: ffff880039dd3c68 RDI: ffff88003752b804 Jul 25 10:26:43 vdr kernel: [ 24.947012] RBP: ffff880039dd3d38 R08: ffff880039dd3ba8 R09: 0000000000000000 Jul 25 10:26:43 vdr kernel: [ 24.947012] R10: ffff88003a8518e8 R11: ffff8800335635c8 R12: ffff88003752b800 Jul 25 10:26:43 vdr kernel: [ 24.947012] R13: 00000000fffffe00 R14: ffff88003746d580 R15: 0000000000000100 Jul 25 10:26:43 vdr kernel: [ 24.947012] FS: 000000004b0b1950(0063) GS:ffff8800015dc000(0000) knlGS:0000000000000000 Jul 25 10:26:43 vdr kernel: [ 24.947012] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Jul 25 10:26:43 vdr kernel: [ 24.947012] CR2: 00007f52b50bf558 CR3: 0000000039c0d000 CR4: 00000000000006f0 Jul 25 10:26:43 vdr kernel: [ 24.947012] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jul 25 10:26:43 vdr kernel: [ 24.947012] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Jul 25 10:26:43 vdr kernel: [ 24.947012] Process vdr (pid: 3270, threadinfo ffff880039dd2000, task ffff880039ca5800) Jul 25 10:26:43 vdr kernel: [ 24.947012] Stack: Jul 25 10:26:43 vdr kernel: [ 24.947012] 000000000bc00000 ffff880037d59130 0bc0000000008182 00000000fffffffa Jul 25 10:26:43 vdr kernel: [ 24.947012] <0> 000000003752b808 0000000000000000 0000000000000000 0000000000000000 Jul 25 10:26:43 vdr kernel: [ 24.947012] <0> ffff88003752b808 ffff880037d59130 ffff880039dd3d88 ffffffff810d9c55 Jul 25 10:26:43 vdr kernel: [ 24.947012] Call Trace: Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810d9c55>] chrdev_open+0x18d/0x1ae Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810d9ac8>] ? chrdev_open+0x0/0x1ae Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810d552f>] __dentry_open+0x18f/0x2b4 Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810d5721>] nameidata_to_filp+0x41/0x52 Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810e2dde>] do_filp_open+0x533/0xa3a Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff81223099>] ? sys_sendto+0xf1/0x107 Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff812abc5e>] ? _spin_unlock+0x13/0x2c Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810ebc02>] ? alloc_fd+0x11d/0x12e Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810d52bc>] do_sys_open+0x5d/0x104 Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff810d538c>] sys_open+0x1b/0x1d Jul 25 10:26:43 vdr kernel: [ 24.947012] [<ffffffff8100baab>] system_call_fastpath+0x16/0x1b Jul 25 10:26:43 vdr kernel: [ 24.947012] Code: 81 fb 00 f0 ff ff 76 11 48 c7 c7 80 a1 44 81 e8 54 e5 0c 00 e9 b6 00 00 00 48 85 db 74 69 80 bb 38 01 00 00 00 48 8b 53 08 78 71 <81> ba 9c 00 00 00 04 00 01 00 75 16 83 bb 40 01 00 00 00 75 5c Jul 25 10:26:43 vdr kernel: [ 24.947012] RIP [<ffffffff811dbed9>] tty_open+0x1f9/0x424 Jul 25 10:26:43 vdr kernel: [ 24.947012] RSP <ffff880039dd3ce8> -- 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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