[2.6.26] WARN warn_on_slowpath - Kernel

This is a discussion on [2.6.26] WARN warn_on_slowpath - Kernel ; While running my http://vanheusden.com/pyk/ script (which randomly inserts and removes modules) I triggered the folllowing WARNING in a 2.6.26 kernel on an IBM xSeries x3650 (2 quadcores (intel qc x5450) and 10GB ram). [ 2812.832441] sysfs group ffffffffa0191ec0 not found ...

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Thread: [2.6.26] WARN warn_on_slowpath

  1. [2.6.26] WARN warn_on_slowpath

    While running my http://vanheusden.com/pyk/ script (which randomly
    inserts and removes modules) I triggered the folllowing WARNING in a
    2.6.26 kernel on an IBM xSeries x3650 (2 quadcores (intel qc x5450)
    and 10GB ram).

    [ 2812.832441] sysfs group ffffffffa0191ec0 not found for kobject 'cpufreq'
    [ 2812.833486] ------------[ cut here ]------------
    [ 2812.833556] WARNING: at fs/sysfs/group.c:139 cpufreq_stats_free_table+0x32/0x6e [cpufreq_stats]()
    [ 2812.837160] Modules linked in: cpufreq_ondemand sg lp cpufreq_userspace acpi_cpufreq pcspkr edac_core ses parport_pc appletalk(-) enclosure loop thermal parport cpufreq_stats(-) video output battery cdrom rng_core qla2xxx ac rfcomm l2cap bluetooth nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs freq_table ipv6 evdev ext3 jbd mbcache dm_log dm_mod usbhid hid ff_memless sd_mod firmware_class scsi_transport_fc ide_pci_generic ide_core ehci_hcd uhci_hcd scsi_tgt aacraid scsi_mod processor thermal_sys [last unloaded: dm_mirror]
    [ 2812.837160] Pid: 12061, comm: rmmod Not tainted 2.6.26-1-amd64 #1
    [ 2812.837160]
    [ 2812.837160] Call Trace:
    [ 2812.837160] [] warn_on_slowpath+0x51/0x7a
    [ 2812.837160] [] default_wake_function+0x0/0xe
    [ 2812.837160] [] sysfs_find_dirent+0x1b/0x2f
    [ 2812.837160] [] sysfs_get_dirent+0x51/0x59
    [ 2812.837160] [] sysfs_remove_group+0x41/0xc2
    [ 2812.837197] [] :cpufreq_stats:cpufreq_stats_free_table+0x32/0x6e
    [ 2812.837283] [] :cpufreq_stats:cpufreq_stats_exit+0x41/0x58
    [ 2812.837355] [] sys_delete_module+0x1a6/0x1fe
    [ 2812.837494] [] system_call_after_swapgs+0x8a/0x8f
    [ 2812.837564]
    [ 2812.837623] ---[ end trace a70f168407a6dea1 ]---
    [ 2812.837692] sysfs group ffffffffa0191ec0 not found for kobject 'cpufreq'


    Folkert van Heusden

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  2. [2.6.27] allows to rmmod 'ide_pci_generic' with mounted filesystems

    While running my http://vanheusden.com/pyk/ script (which randomly
    inserts and removes modules), the module 'ide_pci_generic' got unloaded
    while filesystems were mounted that used that module. Of course the
    system crashed but I think it should not be possible to unload
    modules when resources it serves are still in use.


    Folkert van Heusden

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  3. Re: [2.6.27] allows to rmmod 'ide_pci_generic' with mounted filesystems

    Hang on: it is not ide_pci_generic causing the filesystem errors. Still
    investigating.

    On Tue, Nov 11, 2008 at 09:02:47PM +0100, Folkert van Heusden wrote:
    > While running my http://vanheusden.com/pyk/ script (which randomly
    > inserts and removes modules), the module 'ide_pci_generic' got unloaded
    > while filesystems were mounted that used that module. Of course the
    > system crashed but I think it should not be possible to unload
    > modules when resources it serves are still in use.
    >
    >
    > Folkert van Heusden
    >
    > --
    > MultiTail cok yonlu kullanimli bir program, loglari okumak, verilen
    > kommandolari yerine getirebilen. Filter, renk verme, merge, 'diff-
    > view', vs. http://www.vanheusden.com/multitail/
    > ----------------------------------------------------------------------
    > Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com



    Folkert van Heusden

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  4. Re: [2.6.27] attempt to access beyond end of device

    Odd, these modules were unloaded but if I unload them "by hand", the system
    keeps running without any failures.
    -ac
    -battery
    -button
    -container
    -dm_mirror
    -dm_snapshot
    -fan
    -floppy
    -ide_cd_mod
    -parport_pc
    -rng_core
    -usbhid

    The errors are, by the way:
    [ 90.355347] attempt to access beyond end of device
    [ 90.355413] dm-0: rw=0, want=4993757896, limit=565248
    [ 90.355490] Buffer I/O error on device dm-0, logical block 2496878947
    [ 90.355559] attempt to access beyond end of device
    [ 90.355614] dm-0: rw=0, want=1967413868, limit=565248
    [ 90.355674] Buffer I/O error on device dm-0, logical block 983706933
    [ 90.355748] attempt to access beyond end of device
    [ 90.355804] dm-0: rw=0, want=6151601454, limit=565248
    [ 90.355866] Buffer I/O error on device dm-0, logical block 3075800726
    [ 90.355921] attempt to access beyond end of device
    [ 90.355988] dm-0: rw=0, want=2896542408, limit=565248
    [ 90.356059] Buffer I/O error on device dm-0, logical block 1448271203
    [ 128.751683] attempt to access beyond end of device
    [ 128.751749] dm-0: rw=0, want=8168917190, limit=565248
    [ 128.751817] Buffer I/O error on device dm-0, logical block 4084458594
    [ 128.751887] attempt to access beyond end of device
    [ 128.751941] dm-0: rw=0, want=4756365548, limit=565248
    [ 128.752011] Buffer I/O error on device dm-0, logical block 2378182773
    [ 128.752075] attempt to access beyond end of device
    [ 128.752142] dm-0: rw=0, want=4510308232, limit=565248
    [ 128.752201] Buffer I/O error on device dm-0, logical block 2255154115
    [ 128.752256] attempt to access beyond end of device
    [ 128.752310] dm-0: rw=0, want=1847372720, limit=565248
    [ 128.752378] Buffer I/O error on device dm-0, logical block 923686359
    [ 128.820595] attempt to access beyond end of device
    [ 128.820665] dm-0: rw=0, want=5787791288, limit=565248
    [ 128.820733] Buffer I/O error on device dm-0, logical block 2893895643
    [ 128.820811] attempt to access beyond end of device
    [ 128.820872] dm-0: rw=0, want=6800015832, limit=565248
    [ 128.820929] Buffer I/O error on device dm-0, logical block 3400007915


    On Tue, Nov 11, 2008 at 09:38:33PM +0100, Folkert van Heusden wrote:
    > Hang on: it is not ide_pci_generic causing the filesystem errors. Still
    > investigating.
    >
    > On Tue, Nov 11, 2008 at 09:02:47PM +0100, Folkert van Heusden wrote:
    > > While running my http://vanheusden.com/pyk/ script (which randomly
    > > inserts and removes modules), the module 'ide_pci_generic' got unloaded
    > > while filesystems were mounted that used that module. Of course the
    > > system crashed but I think it should not be possible to unload
    > > modules when resources it serves are still in use.
    > >
    > >
    > > Folkert van Heusden
    > >
    > > --
    > > MultiTail cok yonlu kullanimli bir program, loglari okumak, verilen
    > > kommandolari yerine getirebilen. Filter, renk verme, merge, 'diff-
    > > view', vs. http://www.vanheusden.com/multitail/
    > > ----------------------------------------------------------------------
    > > Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com

    >
    >
    > Folkert van Heusden
    >
    > --
    > MultiTail is een flexibele tool voor het volgen van logfiles en
    > uitvoer van commando's. Filteren, van kleur voorzien, mergen,
    > 'diff-view', etc. http://www.vanheusden.com/multitail/
    > ----------------------------------------------------------------------
    > Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com



    Folkert van Heusden

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    MultiTail is een flexibele tool voor het volgen van logfiles en
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    ----------------------------------------------------------------------
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