I am seeing strange behaviour with my USB stick. I can mount it the first time it is inserted, but after unmounting, unplugging, and plugging in again, it can't be mounted.
I have also seen one case where it was possible to mount it the second time round, but got a kernel bug report dumped to syslog when I unmounted it. I'm using udev 0.031. Kernel is Debian 2.6.8. hal is managing /etc/fstab. The USB stick is a SanDisk Cruzer Mini Here's the kernel bug dump: Oct 1 09:54:20 kuhaugen kernel: usb-storage: Error in device_reset: invalid state 0 Oct 1 09:55:22 kuhaugen kernel: ------------[ cut here ]------------ Oct 1 09:55:22 kuhaugen kernel: kernel BUG at drivers/block/as-iosched.c:312! Oct 1 09:55:22 kuhaugen kernel: invalid operand: 0000 [#1] Oct 1 09:55:22 kuhaugen kernel: PREEMPT Oct 1 09:55:22 kuhaugen kernel: Modules linked in: sd_mod usb_storage scsi_mod ipv6 lp binfmt_misc ds ipt_state ip_conntrack iptable_filter ip_tables af_packet e100 yenta_socket pcmcia_core snd_intel8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc gameport snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore hw_random uhci_hcd usbcore shpchp pciehp pci_hotplug intel_agp agpgart parport_pc parport floppy irtty_sir sir_dev pcspkr rtc nls_iso8859_1 nls_cp437 capability commoncap tsdev ircomm_tty evdev ircomm irda crc_ccitt mousedev psmouse eepro100 mii apm vfat fat ext3 jbd mbcache ide_generic piix ide_disk ide_core unix font vesafb cfbcopyarea cfbimgblt cfbfillrect Oct 1 09:55:22 kuhaugen kernel: CPU: 0 Oct 1 09:55:22 kuhaugen kernel: EIP: 0060:[as_find_arq_hash+153/176] Not tainted Oct 1 09:55:22 kuhaugen kernel: EFLAGS: 00010046 (2.6.8-1-686) Oct 1 09:55:22 kuhaugen kernel: EIP is at as_find_arq_hash+0x99/0xb0 Oct 1 09:55:22 kuhaugen kernel: eax: 00000000 ebx: 00000000 ecx: d7a49260 edx: 08085dfc Oct 1 09:55:22 kuhaugen kernel: esi: 00000000 edi: 00000219 ebp: 00000000 esp: d691fb84 Oct 1 09:55:22 kuhaugen kernel: ds: 007b es: 007b ss: 0068 Oct 1 09:55:22 kuhaugen kernel: Process famd (pid: 3572, threadinfo=d691e000 task=d7990620) Oct 1 09:55:22 kuhaugen kernel: Stack: c01180c2 d7a10030 bffff8b8 00000000 d7a49260 0000021a 00000000 c0201fcd Oct 1 09:55:22 kuhaugen kernel: d7a49260 00000219 00000000 00000000 dc86267a d7a49260 00000000 d664c02c Oct 1 09:55:22 kuhaugen kernel: 00000000 00000000 c01f90e9 d664c02c d691fc04 cabdf0e0 c01fc2c7 d664c02c Oct 1 09:55:22 kuhaugen kernel: Call Trace: Oct 1 09:55:22 kuhaugen kernel: [activate_task+98/128] activate_task+0x62/0x80 Oct 1 09:55:22 kuhaugen kernel: [as_merge+285/512] as_merge+0x11d/0x200 Oct 1 09:55:22 kuhaugen kernel: [elv_merge+41/48] elv_merge+0x29/0x30 Oct 1 09:55:22 kuhaugen kernel: [__make_request+183/1376] __make_request+0xb7/0x560 Oct 1 09:55:22 kuhaugen kernel: [generic_make_request+362/496] generic_make_request+0x16a/0x1f0 Oct 1 09:55:22 kuhaugen kernel: [autoremove_wake_function+0/96] autoremove_wake_function+0x0/0x60 Oct 1 09:55:22 kuhaugen kernel: [autoremove_wake_function+0/96] autoremove_wake_function+0x0/0x60 Oct 1 09:55:22 kuhaugen kernel: [submit_bio+93/256] submit_bio+0x5d/0x100 Oct 1 09:55:22 kuhaugen kernel: [end_buffer_read_sync+0/48] end_buffer_read_sync+0x0/0x30 Oct 1 09:55:22 kuhaugen kernel: [submit_bh+97/336] submit_bh+0x61/0x150 Oct 1 09:55:22 kuhaugen kernel: [__bread_slow+74/128] __bread_slow+0x4a/0x80 Oct 1 09:55:22 kuhaugen kernel: [__bread+61/80] __bread+0x3d/0x50 Oct 1 09:55:22 kuhaugen kernel: [__crc_blk_queue_start_tag+2580343/4471782] fat__get_entry+0xb6/0x194 [fat] Oct 1 09:55:22 kuhaugen kernel: [__crc_blk_queue_start_tag+2565532/4471782] fat_readdirx+0xd3b/0xe30 [fat] Oct 1 09:55:22 kuhaugen kernel: [sock_sendmsg+157/192] sock_sendmsg+0x9d/0xc0 Oct 1 09:55:22 kuhaugen kernel: [__crc_blk_queue_start_tag+2462204/4471782] vfat_cmpi+0x3b/0xb0 [vfat] Oct 1 09:55:22 kuhaugen kernel: [__d_lookup+358/368] __d_lookup+0x166/0x170 Oct 1 09:55:22 kuhaugen kernel: [__crc_blk_queue_start_tag+2462204/4471782] vfat_cmpi+0x3b/0xb0 [vfat] Oct 1 09:55:22 kuhaugen kernel: [__d_lookup+358/368] __d_lookup+0x166/0x170 Oct 1 09:55:22 kuhaugen kernel: [__crc_blk_queue_start_tag+2462204/4471782] vfat_cmpi+0x3b/0xb0 [vfat] Oct 1 09:55:22 kuhaugen kernel: [__d_lookup+358/368] __d_lookup+0x166/0x170 Oct 1 09:55:22 kuhaugen kernel: [dput+49/544] dput+0x31/0x220 Oct 1 09:55:22 kuhaugen kernel: [link_path_walk+2635/3488] link_path_walk+0xa4b/0xda0 Oct 1 09:55:22 kuhaugen kernel: [__crc_blk_queue_start_tag+2565830/4471782] fat_readdir+0x35/0x40 [fat] Oct 1 09:55:22 kuhaugen kernel: [filldir64+0/256] filldir64+0x0/0x100 Oct 1 09:55:22 kuhaugen kernel: [vfs_readdir+165/192] vfs_readdir+0xa5/0xc0 Oct 1 09:55:22 kuhaugen kernel: [filldir64+0/256] filldir64+0x0/0x100 Oct 1 09:55:22 kuhaugen kernel: [sys_getdents64+110/170] sys_getdents64+0x6e/0xaa Oct 1 09:55:22 kuhaugen kernel: [filldir64+0/256] filldir64+0x0/0x100 Oct 1 09:55:22 kuhaugen kernel: [syscall_call+7/11] syscall_call+0x7/0xb Oct 1 09:55:22 kuhaugen kernel: Code: 0f 0b 38 01 09 a0 29 c0 eb ac 8d b6 00 00 00 00 8d bc 27 00 Oct 1 09:55:22 kuhaugen kernel: <6>note: famd[3572] exited with preempt_count 2 The sequence of actions which led up to this was: - Reboot - Insert stick There's now an entry in fstab - Remove stick fstab entry is gone - Insert stick udev logs to syslog that it's creating sdb1, sda1 entry was added to fstab - mount from command line 'mount -t vfat /dev/sdb1 <mountpoint> ls <mountpoint> looks OK - umount The kernel bug message shown above is logged to syslog. I've seen the kernel bug dump only once. More typical syslogs: Plugging in for the first time: Sep 30 10:42:14 kuhaugen kernel: usb 2-1: new full speed USB device using address 2 Sep 30 10:42:15 kuhaugen kernel: SCSI subsystem initialized Sep 30 10:42:15 kuhaugen kernel: Initializing USB Mass Storage driver... Sep 30 10:42:15 kuhaugen kernel: scsi0 : SCSI emulation for USB Mass Storage devices Sep 30 10:42:15 kuhaugen kernel: Vendor: Generic Model: STORAGE DEVICE Rev: 1.25 Sep 30 10:42:15 kuhaugen kernel: Type: Direct-Access ANSI SCSI revision: 02 Sep 30 10:42:15 kuhaugen usb.agent[4439]: usb-storage: loaded successfully Sep 30 10:42:15 kuhaugen kernel: USB Mass Storage device found at 2 Sep 30 10:42:15 kuhaugen kernel: usbcore: registered new driver usb-storage Sep 30 10:42:15 kuhaugen kernel: USB Mass Storage support registered. Sep 30 10:42:15 kuhaugen scsi.agent[4503]: disk at /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/host0/0:0:0:0 Sep 30 10:42:15 kuhaugen kernel: SCSI device sda: 256000 512-byte hdwr sectors (131 MB) Sep 30 10:42:15 kuhaugen kernel: sda: Write Protect is off Sep 30 10:42:15 kuhaugen kernel: sda: Mode Sense: 02 00 00 00 Sep 30 10:42:15 kuhaugen kernel: sda: assuming drive cache: write through Sep 30 10:42:15 kuhaugen udev: creating device node '/dev/sda' Sep 30 10:42:15 kuhaugen kernel: /dev/scsi/host0/bus0/target0/lun0: p1 Sep 30 10:42:15 kuhaugen kernel: Attached scsi removable disk sda at scsi0, channel 0, id 0, lun 0 Sep 30 10:42:15 kuhaugen udev: creating device node '/dev/sda1' Sep 30 10:42:16 kuhaugen fstab-sync[4539]: added mount point /media/usbdisk for /dev/sda1 Sep 30 10:44:01 kuhaugen /USR/SBIN/CRON[4586]: (jk) CMD (/home/jk/net-status/bin/cpumem) hal/gnome-vfs-manager now mounts it. Everything is fine. I unmount it successfully, and unplug the device: Sep 30 10:46:17 kuhaugen udev: removing device node '/dev/sda1' Sep 30 10:46:17 kuhaugen udev: removing device node '/dev/sda' Sep 30 10:46:17 kuhaugen kernel: usb 2-1: USB disconnect, address 2 Sep 30 10:46:17 kuhaugen fstab-sync[4652]: removed mount point /media/usbdisk for /dev/sda1 Now I plug it on for the second time: Sep 30 10:46:40 kuhaugen kernel: usb 2-1: new full speed USB device using address 3 Sep 30 10:46:40 kuhaugen kernel: scsi1 : SCSI emulation for USB Mass Storage devices Sep 30 10:46:40 kuhaugen kernel: Vendor: Generic Model: STORAGE DEVICE Rev: 1.25 Sep 30 10:46:40 kuhaugen kernel: Type: Direct-Access ANSI SCSI revision: 02 Sep 30 10:46:41 kuhaugen kernel: sda : unsupported sector size -402718720. Note the garbage sector size. Sep 30 10:46:41 kuhaugen kernel: SCSI device sda: 0 -402718720-byte hdwr sectors (0 MB) Sep 30 10:46:41 kuhaugen kernel: sda: Write Protect is off Sep 30 10:46:41 kuhaugen kernel: sda: Mode Sense: 02 00 00 00 Sep 30 10:46:41 kuhaugen kernel: sda: assuming drive cache: write through Sep 30 10:46:41 kuhaugen kernel: Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0 Sep 30 10:46:41 kuhaugen kernel: USB Mass Storage device found at 3 Sep 30 10:46:41 kuhaugen scsi.agent[4750]: disk at /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/host1/1:0:0:0 Sep 30 10:46:42 kuhaugen udev: creating device node '/dev/sda' It's not possible to mount /dev/sda1. My first idea was that udev got confused about which device it should create (no idea if that's possible). Anyway, I restarted the computer with udev off, and tried mounting both as /dev/sda1 and /dev/sdb1 the second time round. Neither worked. Another variant of the second plugging in: Oct 1 10:06:35 kuhaugen kernel: usb 2-1: new full speed USB device using address 3 Oct 1 10:06:36 kuhaugen kernel: scsi1 : SCSI emulation for USB Mass Storage devices Oct 1 10:06:36 kuhaugen kernel: Vendor: Generic Model: STORAGE DEVICE Rev: 1.25 Oct 1 10:06:36 kuhaugen kernel: Type: Direct-Access ANSI SCSI revision: 02 Oct 1 10:06:46 kuhaugen hal.hotplug[4793]: timout(10000 ms) waiting for /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0 Oct 1 10:06:46 kuhaugen hal.hotplug[4803]: timout(10000 ms) waiting for /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/host1/1:0:0:0 Oct 1 10:06:46 kuhaugen usb.agent[4816]: usb-storage: already loaded Oct 1 10:06:56 kuhaugen scsi.agent[4821]: Attribute /sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1:1.0/host1/1:0:0:0/type does not exist These modules are loaded when the stick is mounted: Module Size Used by sd_mod 21696 2 usb_storage 68832 1 scsi_mod 125196 2 sd_mod,usb_storage ipv6 264612 24 lp 11176 0 binfmt_misc 11688 1 ds 18756 4 ipt_state 2080 1 ip_conntrack 35368 1 ipt_state iptable_filter 2880 1 ip_tables 18464 2 ipt_state,iptable_filter af_packet 22600 0 e100 32608 0 yenta_socket 21728 0 pcmcia_core 70900 2 ds,yenta_socket snd_intel8x0 36460 0 snd_ac97_codec 70020 1 snd_intel8x0 snd_pcm_oss 55048 0 snd_mixer_oss 20096 1 snd_pcm_oss snd_pcm 98728 2 snd_intel8x0,snd_pcm_oss snd_timer 25668 1 snd_pcm snd_page_alloc 11752 2 snd_intel8x0,snd_pcm gameport 4704 1 snd_intel8x0 snd_mpu401_uart 7968 1 snd_intel8x0 snd_rawmidi 25156 1 snd_mpu401_uart snd_seq_device 8200 1 snd_rawmidi snd 57156 9 snd_intel8x0,snd_ac97_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer,snd_mpu401_uart,snd_rawmidi,snd_seq_device soundcore 10336 1 snd hw_random 5460 0 uhci_hcd 33136 0 usbcore 119012 4 usb_storage,uhci_hcd shpchp 101996 0 pciehp 99084 0 pci_hotplug 34640 2 shpchp,pciehp intel_agp 22752 1 agpgart 34696 1 intel_agp parport_pc 35392 1 parport 41832 2 lp,parport_pc floppy 61200 0 irtty_sir 9152 2 sir_dev 19244 1 irtty_sir pcspkr 3592 0 rtc 12760 0 nls_iso8859_1 4032 2 nls_cp437 5696 2 capability 4520 0 commoncap 7232 1 capability tsdev 7392 0 ircomm_tty 40456 0 evdev 9600 0 ircomm 23044 1 ircomm_tty irda 197120 4 irtty_sir,sir_dev,ircomm_tty,ircomm crc_ccitt 2144 1 irda mousedev 10476 2 psmouse 20360 0 eepro100 30700 0 mii 5120 2 e100,eepro100 apm 21100 2 vfat 14656 2 fat 46784 1 vfat ext3 127240 2 jbd 62616 1 ext3 mbcache 9348 1 ext3 ide_generic 1408 0 piix 13440 1 ide_disk 19296 5 ide_core 139940 4 usb_storage,ide_generic,piix,ide_disk unix 28692 64 font 8320 0 vesafb 6656 0 cfbcopyarea 3840 1 vesafb cfbimgblt 3040 1 vesafb cfbfillrect 3776 1 vesafb Device inforamtion from usbview: Cruzer Mini Manufacturer: SanDisk Corporation Serial Number: 000197057 Speed: 12Mb/s (full) USB Version: 2.00 Device Class: 00(>ifc ) Device Subclass: 00 Device Protocol: 00 Maximum Default Endpoint Size: 64 Number of Configurations: 1 Vendor Id: 0781 Product Id: 8181 Revision Number: 1.25 What is going on here? 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