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    SubjectRe: ldisc problems with 2.6.32-2.6.37-rc2 (at least)
    On Wed, Nov 24, 2010 at 08:45:23PM +0100, Jiri Slaby wrote:
    > On 11/24/2010 08:43 PM, Jiri Slaby wrote:
    > > Could you provide disassembly of tty_set_ldisc? E.g. by extracting it from:
    > > objdump -d drivers/tty/tty_ldisc.o
    >
    > Or maybe better after linking:
    > objdump -d vmlinux
    >
    > thanks,
    > --
    > js
    > suse labs

    This is reproduced on second run of application I submitted on my previous mail:

    WARNING: at drivers/tty/tty_ldisc.c:451 tty_ldisc_open+0x3c/0x9c()
    Modules linked in:
    [<c002c694>] (unwind_backtrace+0x0/0xe4) from [<c0037ad4>] (warn_slowpath_common+0x4c/0x64)
    [<c0037ad4>] (warn_slowpath_common+0x4c/0x64) from [<c0037b04>] (warn_slowpath_null+0x18/0x1c)
    [<c0037b04>] (warn_slowpath_null+0x18/0x1c) from [<c01bb88c>] (tty_ldisc_open+0x3c/0x9c)
    [<c01bb88c>] (tty_ldisc_open+0x3c/0x9c) from [<c01bc110>] (tty_set_ldisc+0x328/0x454)
    [<c01bc110>] (tty_set_ldisc+0x328/0x454) from [<c01b6624>] (tty_ioctl+0x83c/0xac4)
    [<c01b6624>] (tty_ioctl+0x83c/0xac4) from [<c00b383c>] (vfs_ioctl+0x20/0x3c)
    [<c00b383c>] (vfs_ioctl+0x20/0x3c) from [<c00b3f9c>] (do_vfs_ioctl+0x540/0x598)
    [<c00b3f9c>] (do_vfs_ioctl+0x540/0x598) from [<c00b4028>] (sys_ioctl+0x34/0x54)
    [<c00b4028>] (sys_ioctl+0x34/0x54) from [<c0027a80>] (ret_fast_syscall+0x0/0x2c)
    ---[ end trace 478cfbb6d09c3354 ]---
    can't set ldisc: Cannot allocate memory
    root@sheevaplug:~# ./a.out /dev/ttyS1
    .
    ^C
    root@sheevaplug:~# ./a.out /dev/ttyS1
    ------------[ cut here ]------------
    WARNING: at drivers/tty/tty_ldisc.c:451 tty_ldisc_open+0x3c/0x9c()
    Modules linked in:
    [<c002c694>] (unwind_backtrace+0x0/0xe4) from [<c0037ad4>] (warn_slowpath_common+0x4c/0x64)
    [<c0037ad4>] (warn_slowpath_common+0x4c/0x64) from [<c0037b04>] (warn_slowpath_null+0x18/0x1c)
    [<c0037b04>] (warn_slowpath_null+0x18/0x1c) from [<c01bb88c>] (tty_ldisc_open+0x3c/0x9c)
    [<c01bb88c>] (tty_ldisc_open+0x3c/0x9c) from [<c01bc110>] (tty_set_ldisc+0x328/0x454)
    [<c01bc110>] (tty_set_ldisc+0x328/0x454) from [<c01b6624>] (tty_ioctl+0x83c/0xac4)
    [<c01b6624>] (tty_ioctl+0x83c/0xac4) from [<c00b383c>] (vfs_ioctl+0x20/0x3c)
    [<c00b383c>] (vfs_ioctl+0x20/0x3c) from [<c00b3f9c>] (do_vfs_ioctl+0x540/0x598)
    [<c00b3f9c>] (do_vfs_ioctl+0x540/0x598) from [<c00b4028>] (sys_ioctl+0x34/0x54)
    [<c00b4028>] (sys_ioctl+0x34/0x54) from [<c0027a80>] (ret_fast_syscall+0x0/0x2c)
    ---[ end trace 478cfbb6d09c3355 ]---
    can't set ldisc: Cannot allocate memory

    Initially I run it, everything is ok.
    Then I run it and get error and backtrace.
    And if I run it again, everything is ok again, repeatedly. Probably some resources are properly
    set up in error condition, and not in normal condition.

    I use ARM machine for testing and x86, bug is architecture-independent.

    addr2lines:
    c01bb88c drivers/tty/tty_ldisc.c:452
    c01bc110 drivers/tty/tty_ldisc.c:499
    c01b6624 drivers/tty/tty_io.c:2402
    c00b383c fs/ioctl.c:44
    c00b3f9c fs/ioctl.c:596
    c00b4028 include/linux/file.h:26





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