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Date: Wed, 29 Aug 2018 11:42:44 +0000 From: Nathaniel Munk <nathaniel@...k.com.au> To: "netdev@...r.kernel.org" <netdev@...r.kernel.org> Subject: Kernel Panic on high bandwidth transfer over wifi Hi all, I'm running Arch Linux on kernel 4.18.5 (same issue on both arch-provided kernel and mainline built-from-source). There is an issue whereby the kernel crashes when transferring at high bandwidths (approx 6mB/s) over a specific wifi connection. I can only reproduce the issue when using the Personal Hotspot on my iPhone 6S+, but can reproduce it very consistently on that connection. More often than not, any download reaching this speed will cause a panic, but if the download is immediately terminated at the first error the system can recover (and doing this I have obtained the attached logs). Unfortunately, I have not had access to a second machine to obtain the netconsole printout of the panic. As above, high-bandwidth transfers on other wifi networks do not cause the issue (nor on ethernet connections). As you can see from the attached log, the issue appears at tcp_recvmsg+0x579 and net_tx_action+0x1fe. At both these positions (net/ipv4/tcp.c:2000 and net/core/dev.c:4279 in mainline 4.18.5), a member of the skb struct is called. Thank you for your time (and I apologize if this is spurious or badly worded, this is my first bug report), and please don't hesitate to let me know if there's anything else I can do to help work this out. Regards, ------------------- Nathaniel Munk nathaniel@...k.com.au
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