Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: open() on /dev/tty takes 30 seconds on 2.6.36 | Date | Sun, 31 Oct 2010 12:36:38 +0100 |
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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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