bug: sleeping function called from invalid context ... libertas/cmd.c

[Paul Fox]

hi --

on the OLPC XO laptop, i'm seeing the following backtrace fairly
often.  my network management program uses iwconfig a lot, so i
may see it more than others might.  i'm running 2.6.30 (slightly
OLPC-modified, but not at this level), so i think the libertas
driver is pretty current.

btw, this has been mentioned before on this list:
    http://lists.infradead.org/pipermail/libertas-dev/2008-May/001532.html
but i didn't see a resolution -- was there one?  (i haven't yet
convinced myself of exactly when it occurs for me, so i can't say
my symptom is identical to that poster's.)

paul


 [47060.669580] BUG: sleeping function called from invalid context at drivers/net/wireless/libertas/cmd.c:2084
 [47060.669615] in_atomic(): 1, irqs_disabled(): 0, pid: 1994, name: iwconfig
 [47060.669646] Pid: 1994, comm: iwconfig Tainted: G        W  2.6.30pgf #10
 [47060.669667] Call Trace:
 [47060.669710]  [<c0411753>] __might_sleep+0xd6/0xdb
 [47060.669853]  [<cc8154d8>] __lbs_cmd+0x8d/0x17c [libertas]
 [47060.669891]  [<c051ed4d>] ? vsnprintf+0x22a/0x267
 [47060.670087]  [<cc813366>] lbs_get_wireless_stats+0x1c9/0x2f3 [libertas]
 [47060.670183]  [<cc814d7f>] ? lbs_cmd_copyback+0x0/0x48 [libertas]
 [47060.670185]  [<c065b9fc>] wireless_seq_show+0x45/0xdd
 [47060.670185]  [<c048455c>] seq_read+0x2a3/0x372
 [47060.670185]  [<c04a2fcf>] proc_reg_read+0x6a/0x84
 [47060.670185]  [<c04842b9>] ? seq_read+0x0/0x372
 [47060.670185]  [<c04a2fcf>] ? proc_reg_read+0x6a/0x84
 [47060.670185]  [<c047066b>] vfs_read+0x88/0x106
 [47060.670185]  [<c04a2f65>] ? proc_reg_read+0x0/0x84
 [47060.670185]  [<c04707a2>] sys_read+0x4a/0x7a
 [47060.670185]  [<c0403434>] sysenter_do_call+0x12/0x26
 [47060.670185]  [<c0403434>] ? sysenter_do_call+0x12/0x26
 [47060.670185] BUG: scheduling while atomic: iwconfig/1994/0x00000002
 [47060.670185] Modules linked in: rfcomm bnep l2cap uinput usb8xxx libertas btusb bluetooth usbhid mousedev lib80211 psmouse ehci_hcd serio_raw ohci_hcd cs5535_gpio usbcore [last unloaded: rfcomm]
 [47060.670185] Pid: 1994, comm: iwconfig Tainted: G        W  2.6.30pgf #10
 [47060.670185] Call Trace:
 [47060.670185]  [<c041241c>] __schedule_bug+0x47/0x4c
 [47060.670185]  [<c06629d5>] __schedule+0x6e/0x47e
 [47060.670185]  [<c0405371>] ? show_trace+0x10/0x14
 [47060.670185]  [<c0662df7>] schedule+0x12/0x2b
 [47060.670185]  [<c0662df7>] ? schedule+0x12/0x2b
 [47060.670185]  [<cc815532>] __lbs_cmd+0xe7/0x17c [libertas]
 [47060.670185]  [<c0427f45>] ? autoremove_wake_function+0x0/0x2f
 [47060.670185]  [<cc813366>] lbs_get_wireless_stats+0x1c9/0x2f3 [libertas]
 [47060.670185]  [<cc814d7f>] ? lbs_cmd_copyback+0x0/0x48 [libertas]
 [47060.670185]  [<c065b9fc>] wireless_seq_show+0x45/0xdd
 [47060.670185]  [<c048455c>] seq_read+0x2a3/0x372
 [47060.670185]  [<c04a2fcf>] proc_reg_read+0x6a/0x84
 [47060.670185]  [<c04842b9>] ? seq_read+0x0/0x372
 [47060.670185]  [<c04a2fcf>] ? proc_reg_read+0x6a/0x84
 [47060.670185]  [<c047066b>] vfs_read+0x88/0x106
 [47060.670185]  [<c04a2f65>] ? proc_reg_read+0x0/0x84
 [47060.670185]  [<c04707a2>] sys_read+0x4a/0x7a
 [47060.670185]  [<c0403434>] sysenter_do_call+0x12/0x26
 [47060.670185]  [<c0403434>] ? sysenter_do_call+0x12/0x26
 [47060.672482] BUG: scheduling while atomic: iwconfig/1994/0x00000002
 [47060.672502] Modules linked in: rfcomm bnep l2cap uinput usb8xxx libertas btusb bluetooth usbhid mousedev lib80211 psmouse ehci_hcd serio_raw ohci_hcd cs5535_gpio usbcore [last unloaded: rfcomm]
 [47060.672648] Pid: 1994, comm: iwconfig Tainted: G        W  2.6.30pgf #10
 [47060.672669] Call Trace:
 [47060.672702]  [<c041241c>] __schedule_bug+0x47/0x4c
 [47060.672737]  [<c06629d5>] __schedule+0x6e/0x47e
 [47060.672768]  [<c0411313>] ? __wake_up+0x32/0x3b
 [47060.672806]  [<c0662df7>] schedule+0x12/0x2b
 [47060.672838]  [<c0662df7>] ? schedule+0x12/0x2b
 [47060.672935]  [<cc815532>] __lbs_cmd+0xe7/0x17c [libertas]
 [47060.672974]  [<c0427f45>] ? autoremove_wake_function+0x0/0x2f
 [47060.673071]  [<cc813366>] lbs_get_wireless_stats+0x1c9/0x2f3 [libertas]
 [47060.673166]  [<cc814d7f>] ? lbs_cmd_copyback+0x0/0x48 [libertas]
 [47060.673211]  [<c065b9fc>] wireless_seq_show+0x45/0xdd
 [47060.673244]  [<c048455c>] seq_read+0x2a3/0x372
 [47060.673283]  [<c04a2fcf>] proc_reg_read+0x6a/0x84
 [47060.673312]  [<c04842b9>] ? seq_read+0x0/0x372
 [47060.673344]  [<c04a2fcf>] ? proc_reg_read+0x6a/0x84
 [47060.673378]  [<c047066b>] vfs_read+0x88/0x106
 [47060.673410]  [<c04a2f65>] ? proc_reg_read+0x0/0x84
 [47060.673441]  [<c04707a2>] sys_read+0x4a/0x7a
 [47060.673477]  [<c0403434>] sysenter_do_call+0x12/0x26
 [47060.673508]  [<c0403434>] ? sysenter_do_call+0x12/0x26


=---------------------
 paul fox, pgf at laptop.org