[OpenWrt-Devel] Kernel crash in skb_put caused by ath10k_htt_t2h_msg_handler

[Petr Štetiar]

Petr Štetiar <ynezz at true.cz> [2019-04-05 18:03:11]:

Hi Ben,

> > Can you use gdb to print out the lines of code around that crash site in
> > t2h_msg_handler?
> 
> > >  [<87622780>] ath10k_htt_t2h_msg_handler+0x27e0/0x31dc [ath10k_core]
> (gdb) l *ath10k_htt_t2h_msg_handler+0x27e0
> 0x227b0 is in ath10k_htt_rx_handle_amsdu (/ath10k-ct-2019-03-25-2e917efb/ath10k-4.19/htt_rx.c:374).
> 369	
> 370			/* FIXME: we must report msdu payload since this is what caller
> 371			 * expects now
> 372			 */
> 373			skb_put(msdu, offsetof(struct htt_rx_desc, msdu_payload));
> 374			skb_pull(msdu, offsetof(struct htt_rx_desc, msdu_payload));
> 375	
> 376			/*
> 377			 * Sanity check - confirm the HW is finished filling in the
> 378			 * rx data.
> 
> > >  [<8764901c>] ath10k_ce_rx_update_write_idx+0x9c/0xc4 [ath10k_core]
> (gdb) l* ath10k_ce_rx_update_write_idx+0x9c
> 0x4904c is in ath10k_ce_rx_update_write_idx (/ath10k-ct-2019-03-25-2e917efb/ath10k-4.19/ce.c:763).
> 758		if (((cur_write_idx + nentries) & nentries_mask) == dest_ring->sw_index)
> 759			nentries -= 1;
> 760	
> 761		write_index = CE_RING_IDX_ADD(nentries_mask, write_index, nentries);
> 762		ath10k_ce_dest_ring_write_index_set(ar, ctrl_addr, write_index);
> 763		dest_ring->write_index = write_index;
> 764	}
> 765	EXPORT_SYMBOL(ath10k_ce_rx_update_write_idx);
> 766	
> 767	int ath10k_ce_rx_post_buf(struct ath10k_ce_pipe *pipe, void *ctx,
> 
> > I can figure out which message caused it I can add debugging and/or protective code.
> 
> Thanks and good luck!
> 
> 1. http://lists.infradead.org/pipermail/ath10k/2019-April/013138.html

any luck with this bug? While doing some development on my Archer c7v5, I'm
hitting this bug several times a day, so I'm wondering if I could do something
in order to help fixing this. Thanks!

-- ynezz

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