Messages in this thread | | | Date | Fri, 1 Oct 2004 20:56:58 -0700 | From | Andrew Morton <> | Subject | Re: [2.6.9-rc3-bk1] Sleeping function called from invalid context |
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sebek64@post.cz (Marcel Sebek) wrote: > > I upgraded from 2.6.8-rc2-bk10. > When I run pppd, a lot of debug messages are typed out. > pppd uses /dev/ttyUSB0 as serial device (driver ftdi_sio). > > My .config is at http://wremcont.mysteria.cz/config-2.6.9-rc3-bk1 > Kernel debug output is at http://wremcont.mysteria.cz/messages-2.6.9-rc3-bk1
OK, we have a problem.
Debug: sleeping function called from invalid context at mm/slab.c:2052 in_atomic():1, irqs_disabled():1 [__might_sleep+180/224] __might_sleep+0xb4/0xe0 [pg0+273102006/1069224960] hcd_submit_urb+0x106/0x190 [usbcore] [kmem_cache_alloc+91/96] kmem_cache_alloc+0x5b/0x60 [pg0+273105606/1069224960] usb_control_msg+0x36/0xa0 [usbcore] [pg0+272960692/1069224960] ftdi_set_termios+0x144/0x5f0 [ftdi_sio] [pg0+273029492/1069224960] serial_set_termios+0x44/0xa0 [usbserial] [tty_wait_until_sent+215/240] tty_wait_until_sent+0xd7/0xf0 [change_termios+480/528] change_termios+0x1e0/0x210 [set_termios+227/288] set_termios+0xe3/0x120 [tty_ioctl+1025/1248] tty_ioctl+0x401/0x4e0 [sys_ioctl+233/608] sys_ioctl+0xe9/0x260 [sysenter_past_esp+82/113] sysenter_past_esp+0x52/0x71 bad: scheduling while atomic!
In rc3 change_termios() was altered so that it calls (*tty->driver->set_termios)() under spin_lock_irqsave(tty_termios_lock).
But ftdi_set_termios() wants to perform USB I/O, which involves sleeping allocations all over the place.
There may be other ->set_termios() implementations which want to sleep, too. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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