Messages in this thread | | | Subject | Re: Bad skb and hard irq messages with 2.3.49, PPP, USB modem | From | Henner Eisen <> | Date | 09 Mar 2000 01:18:04 +0100 |
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>>>>> "Andi" == Andi Kleen <ak@suse.de> writes:
Andi> Sounds like a bug -- the PPP driver is probably not Andi> reentrant enough for that.
Andi> - -Andi
It seems that the ppp driver is subject to a similar phenomenon as we are observing in the isdn driver:
The ppp channel calls ppp_output_wakeup() from interrupt, which in turn pulls a new skb from the ppp xmit queue and passes it finally downstream via ppp_send_frame(). All this occurs from interrupt context -- a fact which is somewhat hidden in the code (naively, one would assume the same context as in dev->hard_start_xmit()). Thus, any kfree_skb() in the lower xmit path is potentially called from interrupt context.
Henner
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