I am seeing this in my 4.7 kernel while debugging QCA 9884 firmware that
is crashing very often. Looks like this must exacerbate some race condition,
as ar->txqs appears to have entries in it that have been deleted already.
Just in case someone has already worked on this, please let me know. I'll
keep hacking on the problem in the meantime...
(gdb) l *(ath10k_mac_tx_push_pending+0x143)
0x147e3 is in ath10k_mac_tx_push_pending
(/home/greearb/git/linux-4.7.dev.y/drivers/net/wireless/ath/ath10k/mac.c:4230).
4225 return true;
4226
4227 if (ar->htt.num_pending_tx <
ar->htt.tx_q_state.num_push_allowed)
4228 return true;
4229
4230 if (artxq->num_fw_queued < artxq->num_push_allowed)
4231 return true;
4232
4233 return false;
4234 }
==================================================================
BUG: KASAN: use-after-free in ath10k_mac_tx_push_pending+0x143/0x310
[ath10k_core] at addr ffff8801d3137130
Read of size 8 by task ksoftirqd/0/3
=============================================================================
BUG kmalloc-2048 (Tainted: G W ): kasan: bad access detected
-----------------------------------------------------------------------------
INFO: Allocated in sta_info_alloc+0x33c/0x820 [mac80211] age=12766 cpu=1
pid=3548
___slab_alloc+0x480/0x4b0
__slab_alloc.isra.62+0x26/0x40
__kmalloc+0x17c/0x1e0
sta_info_alloc+0x33c/0x820 [mac80211]
ieee80211_prep_connection+0x140/0xf80 [mac80211]
ieee80211_mgd_auth+0x3d2/0x670 [mac80211]
ieee80211_auth+0x13/0x20 [mac80211]
cfg80211_mlme_auth+0x1db/0x380 [cfg80211]
nl80211_authenticate+0x54b/0x5f0 [cfg80211]
genl_family_rcv_msg+0x3b7/0x600
genl_rcv_msg+0xbf/0xf0
netlink_rcv_skb+0x14d/0x180
genl_rcv+0x23/0x40
netlink_unicast+0x2ce/0x390
netlink_sendmsg+0x54c/0x680
sock_sendmsg+0x6f/0x80
INFO: Freed in sta_info_free+0xbb/0x120 [mac80211] age=409 cpu=4 pid=291
__slab_free+0x17a/0x2d0
kfree+0x18d/0x1a0
sta_info_free+0xbb/0x120 [mac80211]
__sta_info_destroy_part2+0x1eb/0x2b0 [mac80211]
__sta_info_flush+0x1fb/0x2f0 [mac80211]
ieee80211_set_disassoc+0x103/0x480 [mac80211]
ieee80211_sta_connection_lost+0x8b/0xe0 [mac80211]
ieee80211_sta_work+0xb3a/0x22e0 [mac80211]
ieee80211_iface_work+0x466/0x500 [mac80211]
process_one_work+0x2b8/0x7f0
worker_thread+0x87/0x820
kthread+0x164/0x190
ret_from_fork+0x1f/0x40
Thanks,
Ben
--
Ben Greear <[email protected]>
Candela Technologies Inc http://www.candelatech.com
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