Date: Wed, 22 Nov 2017 01:40:09 -0500 From: Farhan Khan <khanzf@gmail.com> To: freebsd-drivers@freebsd.org Subject: Kernel page fault with the following non-sleepable locks Message-ID: <cca94222-1ae9-b1c1-b1fe-43eb388ebd2d@gmail.com>
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Hi all, I received this error following what appeared to be a PCI interrupt. Kernel page fault with the following non-sleepable locks held: exclusive sleep mutex rtwn (network driver) r = 0 (0xfffffe000920c000) locked @ /usr/src/sys/dev/rtwn/pci/rtwn_pci_rx.c:290 This is followed by a stack trace, with the rtwn_pci_rx_frame as the last driver-relevant function. The fault code is "supervisor read instruction, page not present". I understand that this happens after a mutex lock is held beyond a period of time, as described here: https://www.freebsd.org/doc/en/books/faq/troubleshoot.html#idp59180136 My questions are: A) What defines long periods of time? B) What common patterns might cause this issue? Is there something in specific I should look for? Would it be a PCI read request that takes too long to return? Thank you, Farhan Khanhelp
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