Date: Sat, 9 Feb 2013 09:47:12 -0500 From: Eitan Adler <lists@eitanadler.com> To: wireless@freebsd.org Subject: panic on removing urtw0 Message-ID: <CAF6rxgnGvJKwV3ej56eKx7UgZrnRYgm89VgkuQEpC-WOQU43Bg@mail.gmail.com>
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I recently encountered a kernel panic upon removing a urtw0 device. This removal occurred during machine shutdown. The crashing kernel and textdump is available upon request. Unread portion of the kernel message buffer: urtw0: failed to stop (USB_ERR_NOT_CONFIGURED) Fatal trap 12: page fault while in kernel mode cpuid = 1; apic id = 01 fault virtual address = 0x368 fault code = supervisor read data, page not present instruction pointer = 0x20:0xffffffff808c4be7 stack pointer = 0x28:0xffffff8227152730 frame pointer = 0x28:0xffffff8227152780 code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, long 1, def32 0, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 15 (usbus2) trap number = 12 panic: page fault cpuid = 1 KDB: stack backtrace: #0 0xffffffff8090c7a6 at kdb_backtrace+0x66 #1 0xffffffff808d67be at panic+0x1ce #2 0xffffffff80bc4140 at trap_fatal+0x290 #3 0xffffffff80bc447d at trap_pfault+0x1ed #4 0xffffffff80bc4a9e at trap+0x3ce #5 0xffffffff80baf05f at calltrap+0x8 #6 0xffffffff809a541a at ieee80211_ageq_remove+0xea #7 0xffffffff809a54c9 at ieee80211_ageq_drain_node+0x9 #8 0xffffffff809c584a at node_cleanup+0x6a #9 0xffffffff809c5960 at node_free+0x30 #10 0xffffffff8077f97b at urtw_free_data_list+0x4b #11 0xffffffff80785a45 at urtw_detach+0xd5 #12 0xffffffff80905a84 at device_detach+0x74 #13 0xffffffff80750388 at usb_detach_device+0x58 #14 0xffffffff80750524 at usb_unconfigure+0x34 #15 0xffffffff807507c5 at usb_free_device+0x195 #16 0xffffffff80758dce at uhub_explore+0x1be #17 0xffffffff807590d4 at uhub_explore+0x4c4 -- Eitan Adler
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