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    SubjectRe: recent -git: BUG in free_thread_xstate
    On Thu, Jul 24, 2008 at 12:05 AM, Vegard Nossum <> wrote:
    > On Thu, Jul 24, 2008 at 12:01 AM, Dmitry Adamushko
    > <> wrote:
    >> So I guess, 'cpu' value is slightly, well, out of reality. Check the
    >> address of "runqueues" in your kernel image...
    >> I guess, it should be quite close to the "fault" address... then we
    >> can even calculate 'cpu' :-)
    > Yup, that's right.
    > $ nm vmlinux | grep runqueues
    > c0803f00 d per_cpu__runqueues

    Hey, with this patch applied:

    diff --git a/include/asm-x86/string_32.h b/include/asm-x86/string_32.h
    index b49369a..7bef7ea 100644
    --- a/include/asm-x86/string_32.h
    +++ b/include/asm-x86/string_32.h
    @@ -29,9 +29,14 @@ extern char *strchr(const char *s, int c);
    #define __HAVE_ARCH_STRLEN
    extern size_t strlen(const char *s);

    +extern void warn_on_slowpath(const char *file, int line);
    static __always_inline void * __memcpy(void * to, const void * from, size_t n)
    int d0, d1, d2;
    + if (n == 0x6b)
    + warn_on_slowpath(__FILE__, __LINE__);
    __asm__ __volatile__(
    "rep ; movsl\n\t"
    "movl %4,%%ecx\n\t"
    I have found an important clue; it seems to be my network driver's fault:

    ------------[ cut here ]------------
    WARNING: at include2/asm/string_32.h:38 skb_copy_and_csum_dev+0xee/0x100()
    Pid: 3989, comm: bash Tainted: G W 2.6.26-dirty #3
    [<c013496f>] warn_on_slowpath+0x4f/0x70
    [<c0198041>] ? check_bytes_and_report+0x21/0xc0
    [<c04a8544>] ? __kfree_skb+0x34/0x80
    [<c0198041>] ? check_bytes_and_report+0x21/0xc0
    [<c01983ef>] ? check_object+0xdf/0x1f0
    [<c0198041>] ? check_bytes_and_report+0x21/0xc0
    [<c04a8544>] ? __kfree_skb+0x34/0x80
    [<c01983ef>] ? check_object+0xdf/0x1f0
    [<c04bbafc>] ? find_skb+0x3c/0x80
    [<c04a9f7e>] skb_copy_and_csum_dev+0xee/0x100
    [<c03539d7>] rtl8139_start_xmit+0x57/0x130
    [<c019a84b>] ? __kmalloc_track_caller+0x8b/0x120
    [<c04bba6e>] netpoll_send_skb+0x14e/0x1a0
    [<c04bbf54>] netpoll_send_udp+0x1e4/0x210
    [<c0374b0c>] write_msg+0x8c/0xc0
    [<c0135053>] __call_console_drivers+0x53/0x60
    [<c01350ab>] _call_console_drivers+0x4b/0x90
    [<c01351f5>] release_console_sem+0xc5/0x1f0
    [<c01357fe>] vprintk+0x2ce/0x420
    [<c0107e7d>] ? do_IRQ+0x4d/0xa0
    [<c0104de5>] ? restore_nocheck+0x12/0x15
    [<c0286ae1>] ? delay_tsc+0x61/0xb8
    [<c0286b06>] ? delay_tsc+0x86/0xb8
    [<c013596b>] printk+0x1b/0x20
    [<c0580d5d>] native_cpu_up+0x7cd/0x880
    [<c01df741>] ? internal_create_group+0xd1/0x180
    [<c0580470>] ? do_fork_idle+0x0/0x20
    [<c014d7c9>] ? __raw_notifier_call_chain+0x19/0x20
    [<c05826f3>] _cpu_up+0x83/0x100
    [<c05827b9>] cpu_up+0x49/0x70
    [<c05635d8>] store_online+0x58/0x80
    [<c0563580>] ? store_online+0x0/0x80
    [<c02fda2b>] sysdev_store+0x2b/0x40
    [<c01dd7b2>] sysfs_write_file+0xa2/0x100
    [<c019f156>] vfs_write+0x96/0x130
    [<c01dd710>] ? sysfs_write_file+0x0/0x100
    [<c019f81d>] sys_write+0x3d/0x70
    [<c0104cdb>] sysenter_past_esp+0x78/0xd1
    ---[ end trace a7919e7f17c0a725 ]---
    In particular, these are interesting:

    [<c04a9f7e>] skb_copy_and_csum_dev+0xee/0x100

    This is net/core/skbuff.c:1731:
    skb_copy_from_linear_data(skb, to, csstart);

    [<c03539d7>] rtl8139_start_xmit+0x57/0x130

    This is drivers/net/8139too.c:1711:

    (The line numbers are still from v2.6.26, but this reproduces on
    current -git as well.)

    Is this enough information to fix it? :-)


    "The animistic metaphor of the bug that maliciously sneaked in while
    the programmer was not looking is intellectually dishonest as it
    disguises that the error is the programmer's own creation."
    -- E. W. Dijkstra, EWD1036

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      Last update: 2008-07-24 00:49    [W:0.050 / U:14.964 seconds]
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