Hi,
I have a reproducible sleep in atomic when I set up hostapd with TKIP on
a rt2800 based USB dongle. As soon as a client connects I see this. I
guess get_tkip_seq may not sleep.
[ 860.827243] BUG: scheduling while atomic: hostapd/3397/0x00000002
[ 860.827275] CPU: 0 PID: 3397 Comm: hostapd Tainted: G W
3.15.0+ #119
[ 860.827275] Hardware name: Dell Inc. Dell System XPS
15Z/00WW5M, BIOS A12 09/07/2012
[ 860.827276] ffff88023fa12e00 ffff88022daff600 ffffffff81682ea6
ffffffff81e6b600
[ 860.827278] ffff88022daff610 ffffffff8167eb9b ffff88022daff670
ffffffff81685bb3
[ 860.827279] ffff88022c22c8f0 ffff88022dafffd8 0000000000012e00
0000000000012e00
[ 860.827280] Call Trace:
[ 860.827282] [<ffffffff81682ea6>] dump_stack+0x4d/0x66
[ 860.827284] [<ffffffff8167eb9b>] __schedule_bug+0x47/0x55
[ 860.827285] [<ffffffff81685bb3>] __schedule+0x733/0x7b0
[ 860.827287] [<ffffffff81685c59>] schedule+0x29/0x70
[ 860.827289] [<ffffffff81684f8a>] schedule_timeout+0x15a/0x2b0
[ 860.827291] [<ffffffff8105ac50>] ? ftrace_raw_event_tick_stop+0xc0/0xc0
[ 860.827294] [<ffffffff810c13c2>] ? __module_text_address+0x12/0x70
[ 860.827296] [<ffffffff81686823>] wait_for_completion_timeout+0xb3/0x140
[ 860.827298] [<ffffffff81080fc0>] ? wake_up_state+0x20/0x20
[ 860.827301] [<ffffffff814d5b3d>] usb_start_wait_urb+0x7d/0x150
[ 860.827303] [<ffffffff814d5cd5>] usb_control_msg+0xc5/0x110
[ 860.827305] [<ffffffffa02fb0c6>] rt2x00usb_vendor_request+0xc6/0x160
[rt2x00usb]
[ 860.827307] [<ffffffffa02fb215>]
rt2x00usb_vendor_req_buff_lock+0x75/0x150 [rt2x00usb]
[ 860.827309] [<ffffffffa02fb393>]
rt2x00usb_vendor_request_buff+0xa3/0xe0 [rt2x00usb]
[ 860.827311] [<ffffffffa023d1a3>]
rt2x00usb_register_multiread+0x33/0x40 [rt2800usb]
[ 860.827314] [<ffffffffa05805f9>] rt2800_get_tkip_seq+0x39/0x50
[rt2800lib]
[ 860.827321] [<ffffffffa0480f88>] ieee80211_get_key+0x218/0x2a0
[mac80211]
[ 860.827322] [<ffffffff815cc68c>] ? __nlmsg_put+0x6c/0x80
[ 860.827329] [<ffffffffa051b02e>] nl80211_get_key+0x22e/0x360 [cfg80211]
[ 860.827334] [<ffffffffa0512e10>] ?
cfg80211_rx_unexpected_4addr_frame+0x130/0x130 [cfg80211]
[ 860.827340] [<ffffffffa050ea36>] ?
__cfg80211_wdev_from_attrs+0x36/0x1a0 [cfg80211]
[ 860.827342] [<ffffffff815d1239>] genl_family_rcv_msg+0x199/0x380
[ 860.827345] [<ffffffff815d1420>] ? genl_family_rcv_msg+0x380/0x380
[ 860.827346] [<ffffffff815d14b1>] genl_rcv_msg+0x91/0xd0
[ 860.827348] [<ffffffff815cf579>] netlink_rcv_skb+0xa9/0xc0
[ 860.827350] [<ffffffff815cfa78>] genl_rcv+0x28/0x40
[ 860.827351] [<ffffffff815cef06>] netlink_unicast+0x166/0x220
[ 860.827353] [<ffffffff815cf2b4>] netlink_sendmsg+0x2f4/0x400
[ 860.827355] [<ffffffff816812fc>] ? __slab_free+0xfe/0x2b4
[ 860.827357] [<ffffffff8158a29b>] sock_sendmsg+0x8b/0xc0
[ 860.827359] [<ffffffff81152457>] ? might_fault+0x47/0x50
[ 860.827361] [<ffffffff81589fc8>] ? move_addr_to_kernel.part.19+0x28/0x80
[ 860.827362] [<ffffffff81152457>] ? might_fault+0x47/0x50
[ 860.827364] [<ffffffff81597dde>] ? verify_iovec+0x5e/0xe0
[ 860.827366] [<ffffffff8158a689>] ___sys_sendmsg+0x369/0x380
[ 860.827367] [<ffffffff811c88bf>] ?
fsnotify_clear_marks_by_inode+0x2f/0x130
[ 860.827369] [<ffffffff81588f7f>] ? sock_destroy_inode+0x2f/0x40
[ 860.827370] [<ffffffff811a5618>] ? destroy_inode+0x38/0x60
[ 860.827372] [<ffffffff811a575c>] ? evict+0x11c/0x190
[ 860.827373] [<ffffffff811a001f>] ? __d_free+0x3f/0x60
[ 860.827375] [<ffffffff811a0074>] ? dentry_free+0x34/0x40
[ 860.827377] [<ffffffff811a10fd>] ? dput+0xad/0x190
[ 860.827379] [<ffffffff811aa044>] ? mntput+0x24/0x40
[ 860.827380] [<ffffffff8118c07d>] ? __fput+0x18d/0x1f0
[ 860.827382] [<ffffffff8158b3d2>] __sys_sendmsg+0x42/0x80
[ 860.827384] [<ffffffff8158b422>] SyS_sendmsg+0x12/0x20
[ 860.827386] [<ffffffff816927e2>] system_call_fastpath+0x16/0x1b
Cheers,
Pontus Fuchs
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