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SubjectRe: open() on /dev/tty takes 30 seconds on 2.6.36
Date
On Sunday 31 October 2010, James Cloos wrote:
> WARNING: at kernel/workqueue.c:1180 worker_enter_idle+0xd6/0xe2()
> Hardware name: MS-7642
> Modules linked in: tcp_diag inet_diag ipt_addrtype xt_dscp xt_string xt_owner xt_multiport xt_iprange xt_hashlimit xt_DSCP xt_NFQUEUE xt_mark xt_connmark tun snd_pcm_oss snd_mixer_oss snd_usb_audio snd_usbmidi_lib snd_rawmidi tpm_tis tpm ppdev parport_pc tpm_bios parport serio_raw edac_core k10temp pcspkr i2c_piix4 shpchp
> Pid: 8061, comm: kworker/0:1 Not tainted 2.6.36-carbon1 #18
> Call Trace:
> [<ffffffff81050c60>] warn_slowpath_common+0x85/0x9d
> [<ffffffff81050c92>] warn_slowpath_null+0x1a/0x1c
> [<ffffffff81066861>] worker_enter_idle+0xd6/0xe2
> [<ffffffff81068453>] worker_thread+0x182/0x19b
> [<ffffffff810682d1>] ? worker_thread+0x0/0x19b
> [<ffffffff8106ba81>] kthread+0x82/0x8a
> [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10
> [<ffffffff8106b9ff>] ? kthread+0x0/0x8a
> [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10
> ---[ end trace 756b0818a6415dca ]---
>
> That was followed by a number of task blocked for more than 120 seconds
> messages, all due to waiting for pty input or output. An example trace:

This is triggered by an internal check in the workqueue handling that
Tejun introduced. I guess it might be possible that this is triggered by
a worker thread being blocked on a mutex, but I don't understand
exactly what it is checking for.

Arnd



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