2.6.23-rc8-git2 possible recursive locking when running screen - Kernel

This is a discussion on 2.6.23-rc8-git2 possible recursive locking when running screen - Kernel ; Seen this a few times lately on a machine running rawhide when running screen (and doing "something", it's not automatic. And box works just fine). I think I saw this a few weeks back, so it's not a new regression. ...

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Thread: 2.6.23-rc8-git2 possible recursive locking when running screen

  1. 2.6.23-rc8-git2 possible recursive locking when running screen

    Seen this a few times lately on a machine running rawhide when running
    screen (and doing "something", it's not automatic. And box works just fine).
    I think I saw this a few weeks back, so it's not a new regression.

    =============================================
    [ INFO: possible recursive locking detected ]
    2.6.23-0.211.rc8.git2.fc8 #1
    ---------------------------------------------
    screen/32227 is trying to acquire lock:
    (&q->lock){++..}, at: [] __wake_up+0x15/0x42

    but task is already holding lock:
    (&q->lock){++..}, at: [] __wake_up+0x15/0x42

    other info that might help us debug this:
    2 locks held by screen/32227:
    #0: (&tty->atomic_read_lock){--..}, at: [] read_chan+0x1a1/0x5af
    #1: (&q->lock){++..}, at: [] __wake_up+0x15/0x42

    stack backtrace:
    [] show_trace_log_lvl+0x1a/0x2f
    [] show_trace+0x12/0x14
    [] dump_stack+0x16/0x18
    [] __lock_acquire+0x189/0xc67
    [] lock_acquire+0x7b/0x9e
    [] _spin_lock_irqsave+0x4a/0x77
    [] __wake_up+0x15/0x42
    [] ep_poll_safewake+0x86/0xa8
    [] ep_poll_callback+0x9f/0xaa
    [] __wake_up_common+0x32/0x55
    [] __wake_up+0x31/0x42
    [] tty_wakeup+0x4f/0x54
    [] pty_unthrottle+0x15/0x21
    [] check_unthrottle+0x2e/0x30
    [] read_chan+0x4ac/0x5af
    [] tty_read+0x66/0xac
    [] vfs_read+0xad/0x167
    [] sys_read+0x3d/0x61
    [] syscall_call+0x7/0xb
    =======================
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  2. Re: 2.6.23-rc8-git2 possible recursive locking when running screen

    On Wednesday, 3 October 2007 11:24, Pekka Pietikainen wrote:
    > Seen this a few times lately on a machine running rawhide when running
    > screen (and doing "something", it's not automatic. And box works just fine).
    > I think I saw this a few weeks back, so it's not a new regression.


    Did it happen with 2.6.22?

    Rafael
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